基于poi的三种excel导出方式

深碍√TFBOYSˉ_ 2024-03-17 17:48 88阅读 0赞

#### 文章目录 ####

*  简介
 *  一、直接遍历数据设值导出
 *   *   *  所需依赖
         *  controller代码
         *  service代码
         *  调用接口测结果
 *  二、通过注解的方式导出
 *   *   *  所需依赖
         *  controller代码
         *  service代码
         *  模板类AgentTpl
         *  ExcelExport.class
         *  ExcelHead.class
         *  ExcelImport.class
         *  ExcelUtils 工具类：
 *  三、基于模板的方式导出
 *   *   *  所需依赖
         *  TemplateExcelUtils 工具类：
         *  excel模板
         *  controller代码
         *  service代码
         *  测试结果

## 简介 ##

平时我们业务开发经常少不了接触导出功能，可以说有列表查询的地方，基本都会用到导出。本章内容主要介绍平时开发中导出的基本逻辑和一些导出方式，用以记录和总结。

我们处理导出的逻辑一般都是需要先取出数据，得到一个数据集合，然后将数据遍历指明每个数据需要放到文件的哪个位置，最后再将文件流上传服务器或者返回客户端。一般导出方式的处理细节差异 ，主要就是处理数据映射文件位置这一步骤。这里总结了一些经常用到的导出方式，常见的有用  
1、直接遍历数据设值导出  
2、注解的方式导出，创建一个类，在定义的属性上加上对应的注解，即可完成映射导出  
3、另外一种是预先创建好一个excel模板，在模板文件里面对应的位置加上对应的字符占位，即可完成映射导出。

## 一、直接遍历数据设值导出 ##

#### 所需依赖 ####

<dependency>
    	   <groupId>org.apache.poi</groupId>
    	   <artifactId>poi</artifactId>
    	   <version>4.1.2</version>
    	</dependency>
    	<dependency>
    	   <groupId>org.apache.poi</groupId>
    	   <artifactId>poi-ooxml</artifactId>
    	   <version>4.1.2</version>
    	</dependency>

#### controller代码 ####

@RestController
    @RequestMapping("/statistics")
    public class TestExportExcel {
        
    
        @Resource
        private TestExportExcelService testExportExcelService;
    
        @PostMapping(value = "/export/excel", produces = MediaType.APPLICATION_JSON_VALUE)
        public Boolean exportExcel(HttpServletResponse response) {
        
            testExportExcelService.testExportExcel(response);
            return true;
        }
    }

#### service代码 ####

import com.cys.share.service.TestExportExcelService;
    import org.apache.commons.codec.Charsets;
    import org.apache.poi.ss.usermodel.*;
    import org.apache.poi.xssf.usermodel.XSSFWorkbook;
    import org.springframework.http.HttpHeaders;
    import org.springframework.stereotype.Service;
    
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    import java.io.OutputStream;
    import java.net.URLEncoder;
    import java.util.ArrayList;
    import java.util.Date;
    import java.util.List;
    
    import static org.apache.tomcat.util.http.fileupload.FileUploadBase.CONTENT_TYPE;
    
    @Service
    public class TestExportExcelServiceImpl implements TestExportExcelService {
        
    
    
        @Override
        public void testExportExcel(HttpServletResponse response) {
        
    
            List<AgentTpl> list = new ArrayList<>();
    
            AgentTpl agentTpl = new AgentTpl();
            agentTpl.setId(1L);
            agentTpl.setName("哈尔滨工业集团");
            agentTpl.setMobile("13800138000");
            list.add(agentTpl);
    
            AgentTpl agentTpl1 = new AgentTpl();
            agentTpl1.setId(2L);
            agentTpl1.setName("西北工业集团");
            agentTpl1.setMobile("13700137000");
            list.add(agentTpl1);
    
            Workbook wb = new XSSFWorkbook();
            //设置单元格式
            Font font = wb.createFont();
            font.setColor(Font.COLOR_NORMAL);
            CellStyle cellStyle = wb.createCellStyle();
            cellStyle.setFont(font);
            cellStyle.setAlignment(HorizontalAlignment.CENTER);
            cellStyle.setVerticalAlignment(VerticalAlignment.CENTER);
            Sheet sheet = wb.createSheet("代理人数据");
    
            List<String[]> rowValues = new ArrayList<>();
            for (AgentTpl tpl : list) {
        
                String[] rowValue = {
        
                        null == tpl.getId() ? "" :tpl.getId().toString(),
                        null == tpl.getName() ? "" : tpl.getName(),
                        null == tpl.getMobile() ? "" :  tpl.getMobile(),
                };
                rowValues.add(rowValue);
            }
    
            for (int i = 0; i < rowValues.size(); i++) {
        
                Row currentRow = sheet.createRow(i);
                // 获取当前行的数据
                String[] cellValues = rowValues.get(i);
                for (int j = 0; j < cellValues.length; j++) {
        
                    // 设置列宽
                    sheet.setColumnWidth(j, 4100);
                    Cell cell = currentRow.createCell(j);
                    cell.setCellStyle(cellStyle);
                    //每个单元格的值目前做 String 处理
                    cell.setCellType(CellType.STRING);
                    cell.setCellValue(cellValues[j]);
                }
            }
            writeToExcel(response, wb, "导出数据列表");
    
        }
    
        public void writeToExcel(HttpServletResponse response, Workbook wb, String fileName) {
        
            OutputStream os = null;
            try {
        
                response.setContentType(CONTENT_TYPE);
                response.setCharacterEncoding(Charsets.UTF_8.name());
                response.setHeader("Access-Control-Expose-Headers", "Content-Disposition");
                response.setHeader(HttpHeaders.CONTENT_DISPOSITION, String.format("attachment; filename=%s", new String(URLEncoder.encode(fileName + ".xlsx" , Charsets.UTF_8.name())
                        .getBytes(Charsets.UTF_8), Charsets.ISO_8859_1)));
                os = response.getOutputStream();
                wb.write(os);
                os.flush();
            } catch (Exception e) {
        
                e.printStackTrace();
            } finally {
        
                if (os != null) {
        
                    try {
        
                        os.close();
                    } catch (IOException e) {
        
                        e.printStackTrace();
                    }
                }
                if (null != wb) {
        
                    try {
        
                        wb.close();
                    } catch (IOException e) {
        
                        e.printStackTrace();
                    }
                }
            }
        }
    }

#### 调用接口测结果 ####

![在这里插入图片描述][f0d148815a254bf1a2b66e3ca24e824f.png]

## 二、通过注解的方式导出 ##

一共需要以下几个文件：  
工具类ExcelUtils  
三个自定义注解类ExcelExport，ExcelHead，ExcelImport  
解析类：ExcelClassField  
模板类：这里根据业务暂时创建一个AgentTpl

#### 所需依赖 ####

#### controller代码 ####

#### service代码 ####

@Override
        public void testExportExcel(HttpServletResponse response) {
        
    		
    		//取出数据，这里在我们平时业务开发一般是从数据库取出数据，然后完成相关的组装
            List<AgentTpl> list = new ArrayList<>();
            AgentTpl agentTpl = new AgentTpl();
            agentTpl.setId(1L);
            agentTpl.setName("哈尔滨工业集团");
            agentTpl.setMobile("13800138000");
            list.add(agentTpl);
    
            AgentTpl agentTpl1 = new AgentTpl();
            agentTpl1.setId(2L);
            agentTpl1.setName("西北工业集团");
            agentTpl1.setMobile("13700137000");
            list.add(agentTpl1);
    
            ExcelUtils.export(response, "导出数据列表", list, AgentTpl.class);
        }

#### 模板类AgentTpl ####

import lombok.AllArgsConstructor;
    import lombok.Data;
    import lombok.NoArgsConstructor;
    import lombok.experimental.Accessors;
    
    import java.io.Serializable;
    @Data
    @Accessors(chain = true)
    @AllArgsConstructor
    @NoArgsConstructor
    public class AgentTpl implements Serializable {
        
    
    
        @ExcelExport(value = "代理商id", sort = 1)
        private Long id;
    
        @ExcelExport(value = "代理商名称", sort = 2)
        private String name;
    
        @ExcelExport(value = "代理商账号", sort = 3)
        private String mobile;
    
    }

#### ExcelExport.class ####

import java.lang.annotation.ElementType;
    import java.lang.annotation.Retention;
    import java.lang.annotation.RetentionPolicy;
    import java.lang.annotation.Target;
    
    @Target(ElementType.FIELD)
    @Retention(RetentionPolicy.RUNTIME)
    public @interface ExcelExport {
        
    
        /** 字段名称 */
        String value();
    
        /** 导出排序先后: 数字越小越靠前（默认按Java类字段顺序导出） */
        int sort() default 0;
    
        /** 导出映射，格式如：0<=>未知;1<=>男;2<=>女 */
        String kv() default "";
    
        /** 导出模板示例值（有值的话，直接取该值，不做映射） */
        String example() default "";
    
    }

#### ExcelHead.class ####

import java.lang.annotation.*;
    
    /**
     * excel头
     */
    @Target({
        ElementType.FIELD})
    @Retention(RetentionPolicy.RUNTIME)
    @Documented
    public @interface ExcelHead {
        
    
        String value() default "";
    
        int order() default 0;
    
    }

#### ExcelImport.class ####

@Target(ElementType.FIELD)
    @Retention(RetentionPolicy.RUNTIME)
    public @interface ExcelImport {
        
    
        /**
         * 字段名称
         */
        String value();
    
        /**
         * 导出映射，格式如：0<=>未知;1<=>男;2<=>女
         */
        String kv() default "";
    
        /**
         * 是否为必填字段（默认为非必填）
         */
        boolean required() default false;
    
        /**
         * 最大长度（默认255）
         */
        int maxLength() default 255;
    
        /**
         * 导入唯一性验证（多个字段则取联合验证）
         */
        boolean unique() default false;
    
    }

import java.util.LinkedHashMap;
    
    @Data
    public class ExcelClassField {
        
    
        /** 字段名称 */
        private String fieldName;
    
        /** 表头名称 */
        private String name;
    
        /** 映射关系 */
        private LinkedHashMap<String, String> kvMap;
    
        /** 示例值 */
        private Object example;
    
        /** 排序 */
        private int sort;
    
        /** 是否为注解字段：0-否，1-是 */
        private int hasAnnotation;
    }

#### ExcelUtils 工具类： ####

import com.alibaba.fastjson.JSONArray;
    import com.alibaba.fastjson.JSONObject;
    import org.apache.poi.hssf.usermodel.HSSFDataValidation;
    import org.apache.poi.hssf.usermodel.HSSFWorkbook;
    import org.apache.poi.poifs.filesystem.POIFSFileSystem;
    import org.apache.poi.ss.usermodel.*;
    import org.apache.poi.ss.util.CellRangeAddress;
    import org.apache.poi.ss.util.CellRangeAddressList;
    import org.apache.poi.xssf.streaming.SXSSFWorkbook;
    import org.apache.poi.xssf.usermodel.XSSFClientAnchor;
    import org.apache.poi.xssf.usermodel.XSSFWorkbook;
    import org.springframework.web.multipart.MultipartFile;
    
    import javax.servlet.ServletOutputStream;
    import javax.servlet.http.HttpServletResponse;
    import java.io.*;
    import java.lang.reflect.Field;
    import java.math.BigDecimal;
    import java.math.RoundingMode;
    import java.net.URL;
    import java.text.NumberFormat;
    import java.text.SimpleDateFormat;
    import java.util.*;
    import java.util.Map.Entry;
    import java.util.regex.Pattern;
    
    
    @SuppressWarnings("unused")
    public class ExcelUtils {
        
    
        private static final String XLSX = ".xlsx";
        private static final String XLS = ".xls";
        public static final String ROW_MERGE = "row_merge";
        public static final String COLUMN_MERGE = "column_merge";
        private static final String DATE_FORMAT = "yyyy-MM-dd HH:mm:ss";
        private static final String ROW_NUM = "rowNum";
        private static final String ROW_DATA = "rowData";
        private static final String ROW_TIPS = "rowTips";
        private static final int CELL_OTHER = 0;
        private static final int CELL_ROW_MERGE = 1;
        private static final int CELL_COLUMN_MERGE = 2;
        private static final int IMG_HEIGHT = 30;
        private static final int IMG_WIDTH = 30;
        private static final char LEAN_LINE = '/';
        private static final int BYTES_DEFAULT_LENGTH = 10240;
        private static final NumberFormat NUMBER_FORMAT = NumberFormat.getNumberInstance();
    
    
        public static <T> List<T> readFile(File file, Class<T> clazz) throws Exception {
        
            JSONArray array = readFile(file);
            return getBeanList(array, clazz);
        }
    
        public static <T> List<T> readMultipartFile(MultipartFile mFile, Class<T> clazz) throws Exception {
        
            JSONArray array = readMultipartFile(mFile);
            return getBeanList(array, clazz);
        }
    
        public static JSONArray readFile(File file) throws Exception {
        
            return readExcel(null, file);
        }
    
        public static JSONArray readMultipartFile(MultipartFile mFile) throws Exception {
        
            return readExcel(mFile, null);
        }
    
        public static Map<String, JSONArray> readFileManySheet(File file) throws Exception {
        
            return readExcelManySheet(null, file);
        }
    
        public static Map<String, JSONArray> readFileManySheet(MultipartFile file) throws Exception {
        
            return readExcelManySheet(file, null);
        }
    
        private static <T> List<T> getBeanList(JSONArray array, Class<T> clazz) throws Exception {
        
            List<T> list = new ArrayList<>();
            Map<Integer, String> uniqueMap = new HashMap<>(16);
            for (int i = 0; i < array.size(); i++) {
        
                list.add(getBean(clazz, array.getJSONObject(i), uniqueMap));
            }
            return list;
        }
    
        /**
         * 获取每个对象的数据
         */
        private static <T> T getBean(Class<T> c, JSONObject obj, Map<Integer, String> uniqueMap) throws Exception {
        
            T t = c.newInstance();
            Field[] fields = c.getDeclaredFields();
            List<String> errMsgList = new ArrayList<>();
            boolean hasRowTipsField = false;
            StringBuilder uniqueBuilder = new StringBuilder();
            int rowNum = 0;
            for (Field field : fields) {
        
                // 行号
                if (field.getName().equals(ROW_NUM)) {
        
                    rowNum = obj.getInteger(ROW_NUM);
                    field.setAccessible(true);
                    field.set(t, rowNum);
                    continue;
                }
                // 是否需要设置异常信息
                if (field.getName().equals(ROW_TIPS)) {
        
                    hasRowTipsField = true;
                    continue;
                }
                // 原始数据
                if (field.getName().equals(ROW_DATA)) {
        
                    field.setAccessible(true);
                    field.set(t, obj.toString());
                    continue;
                }
                // 设置对应属性值
                setFieldValue(t, field, obj, uniqueBuilder, errMsgList);
            }
            // 数据唯一性校验
            if (uniqueBuilder.length() > 0) {
        
                if (uniqueMap.containsValue(uniqueBuilder.toString())) {
        
                    Set<Integer> rowNumKeys = uniqueMap.keySet();
                    for (Integer num : rowNumKeys) {
        
                        if (uniqueMap.get(num).equals(uniqueBuilder.toString())) {
        
                            errMsgList.add(String.format("数据唯一性校验失败,(%s)与第%s行重复)", uniqueBuilder, num));
                        }
                    }
                } else {
        
                    uniqueMap.put(rowNum, uniqueBuilder.toString());
                }
            }
            // 失败处理
            if (errMsgList.isEmpty() && !hasRowTipsField) {
        
                return t;
            }
            StringBuilder sb = new StringBuilder();
            int size = errMsgList.size();
            for (int i = 0; i < size; i++) {
        
                if (i == size - 1) {
        
                    sb.append(errMsgList.get(i));
                } else {
        
                    sb.append(errMsgList.get(i)).append(";");
                }
            }
            // 设置错误信息
            for (Field field : fields) {
        
                if (field.getName().equals(ROW_TIPS)) {
        
                    field.setAccessible(true);
                    field.set(t, sb.toString());
                }
            }
            return t;
        }
    
        private static <T> void setFieldValue(T t, Field field, JSONObject obj, StringBuilder uniqueBuilder, List<String> errMsgList) {
        
            // 获取 ExcelImport 注解属性
            ExcelImport annotation = field.getAnnotation(ExcelImport.class);
            if (annotation == null) {
        
                return;
            }
            String cname = annotation.value();
            if (cname.trim().length() == 0) {
        
                return;
            }
            // 获取具体值
            String val = null;
            if (obj.containsKey(cname)) {
        
                val = getString(obj.getString(cname));
            }
            if (val == null) {
        
                return;
            }
            field.setAccessible(true);
            // 判断是否必填
            boolean require = annotation.required();
            if (require && val.isEmpty()) {
        
                errMsgList.add(String.format("[%s]不能为空", cname));
                return;
            }
            // 数据唯一性获取
            boolean unique = annotation.unique();
            if (unique) {
        
                if (uniqueBuilder.length() > 0) {
        
                    uniqueBuilder.append("--").append(val);
                } else {
        
                    uniqueBuilder.append(val);
                }
            }
            // 判断是否超过最大长度
            int maxLength = annotation.maxLength();
            if (maxLength > 0 && val.length() > maxLength) {
        
                errMsgList.add(String.format("[%s]长度不能超过%s个字符(当前%s个字符)", cname, maxLength, val.length()));
            }
            // 判断当前属性是否有映射关系
            LinkedHashMap<String, String> kvMap = getKvMap(annotation.kv());
            if (!kvMap.isEmpty()) {
        
                boolean isMatch = false;
                for (String key : kvMap.keySet()) {
        
                    if (kvMap.get(key).equals(val)) {
        
                        val = key;
                        isMatch = true;
                        break;
                    }
                }
                if (!isMatch) {
        
                    errMsgList.add(String.format("[%s]的值不正确(当前值为%s)", cname, val));
                    return;
                }
            }
            // 其余情况根据类型赋值
            String fieldClassName = field.getType().getSimpleName();
            try {
        
                if ("String".equalsIgnoreCase(fieldClassName)) {
        
                    field.set(t, val);
                } else if ("boolean".equalsIgnoreCase(fieldClassName)) {
        
                    field.set(t, Boolean.valueOf(val));
                } else if ("int".equalsIgnoreCase(fieldClassName) || "Integer".equals(fieldClassName)) {
        
                    try {
        
                        field.set(t, Integer.valueOf(val));
                    } catch (NumberFormatException e) {
        
                        errMsgList.add(String.format("[%s]的值格式不正确(当前值为%s)", cname, val));
                    }
                } else if ("double".equalsIgnoreCase(fieldClassName)) {
        
                    field.set(t, Double.valueOf(val));
                } else if ("long".equalsIgnoreCase(fieldClassName)) {
        
                    field.set(t, Long.valueOf(val));
                } else if ("BigDecimal".equalsIgnoreCase(fieldClassName)) {
        
                    field.set(t, new BigDecimal(val));
                } else if ("Date".equalsIgnoreCase(fieldClassName)) {
        
                    try {
        
                        field.set(t, new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(val));
                    } catch (Exception e) {
        
                        field.set(t, new SimpleDateFormat("yyyy-MM-dd").parse(val));
                    }
                }
            } catch (Exception e) {
        
                e.printStackTrace();
            }
        }
    
        private static Map<String, JSONArray> readExcelManySheet(MultipartFile mFile, File file) throws IOException {
        
            Workbook book = getWorkbook(mFile, file);
            if (book == null) {
        
                return Collections.emptyMap();
            }
            Map<String, JSONArray> map = new LinkedHashMap<>();
            for (int i = 0; i < book.getNumberOfSheets(); i++) {
        
                Sheet sheet = book.getSheetAt(i);
                JSONArray arr = readSheet(sheet);
                map.put(sheet.getSheetName(), arr);
            }
            book.close();
            return map;
        }
    
        private static JSONArray readExcel(MultipartFile mFile, File file) throws IOException {
        
            Workbook book = getWorkbook(mFile, file);
            if (book == null) {
        
                return new JSONArray();
            }
            JSONArray array = readSheet(book.getSheetAt(0));
            book.close();
            return array;
        }
    
        private static Workbook getWorkbook(MultipartFile mFile, File file) throws IOException {
        
            boolean fileNotExist = (file == null || !file.exists());
            if (mFile == null && fileNotExist) {
        
                return null;
            }
            // 解析表格数据
            InputStream in;
            String fileName;
            if (mFile != null) {
        
                // 上传文件解析
                in = mFile.getInputStream();
                fileName = getString(mFile.getOriginalFilename()).toLowerCase();
            } else {
        
                // 本地文件解析
                in = new FileInputStream(file);
                fileName = file.getName().toLowerCase();
            }
            Workbook book;
            if (fileName.endsWith(XLSX)) {
        
                book = new XSSFWorkbook(in);
            } else if (fileName.endsWith(XLS)) {
        
                POIFSFileSystem poifsFileSystem = new POIFSFileSystem(in);
                book = new HSSFWorkbook(poifsFileSystem);
            } else {
        
                return null;
            }
            in.close();
            return book;
        }
    
        private static JSONArray readSheet(Sheet sheet) {
        
            // 首行下标
            int rowStart = sheet.getFirstRowNum();
            // 尾行下标
            int rowEnd = sheet.getLastRowNum();
            // 获取表头行
            Row headRow = sheet.getRow(rowStart);
            Row twoRow = sheet.getRow(rowStart+1);
            Row threeRow = sheet.getRow(rowStart+2);
            if (headRow == null) {
        
                return new JSONArray();
            }
            int cellStart = headRow.getFirstCellNum();
            int cellEnd = headRow.getLastCellNum();
            Map<Integer, String> keyMap = new HashMap<>();
            int jjj = -1;
            for (int j = cellStart; j < cellEnd; j++) {
        
                // 获取表头数据
                String val = getCellValue(headRow.getCell(j));
                if (val != null && val.trim().length() != 0) {
        
                    jjj = j;
                    keyMap.put(j, val);
                    if(cellEnd != j+1 ){
        
                        String cellValue = getCellValue(headRow.getCell(j + 1));
                        if (cellValue == null || cellValue.trim().length() == 0) {
        
                            keyMap.put(j, val+"^"+getCellValue(twoRow.getCell(j)));
                        }
                    }
    
                }else {
        
                    if(jjj != -1){
        
                        String elseValue = getCellValue(headRow.getCell(jjj));
                        keyMap.put(j, elseValue+"^"+getCellValue(twoRow.getCell(j)));
                    }
                }
            }
            // 如果表头没有数据则不进行解析
            if (keyMap.isEmpty()) {
        
                return (JSONArray) Collections.emptyList();
            }
            // 获取每行JSON对象的值
            JSONArray array = new JSONArray();
            // 如果首行与尾行相同，表明只有一行，返回表头数据
            if (rowStart == rowEnd) {
        
                JSONObject obj = new JSONObject();
                // 添加行号
                obj.put(ROW_NUM, 1);
                for (int i : keyMap.keySet()) {
        
                    obj.put(keyMap.get(i), "");
                }
                array.add(obj);
                return array;
            }
            for (int i = rowStart + 1; i <= rowEnd; i++) {
        
                Row eachRow = sheet.getRow(i);
                JSONObject obj = new JSONObject();
                // 添加行号
                obj.put(ROW_NUM, i + 1);
                StringBuilder sb = new StringBuilder();
                for (int k = cellStart; k < cellEnd; k++) {
        
                    if (eachRow != null) {
        
                        String val = getCellValue(eachRow.getCell(k));
                        // 所有数据添加到里面，用于判断该行是否为空
                        sb.append(val);
                        obj.put(keyMap.get(k), val);
                    }
                }
                if (sb.length() > 0) {
        
                    array.add(obj);
                }
            }
            return array;
        }
    
        private static String getCellValue(Cell cell) {
        
            // 空白或空
            if (cell == null || cell.getCellTypeEnum() == CellType.BLANK) {
        
                return "";
            }
            // String类型
            if (cell.getCellTypeEnum() == CellType.STRING) {
        
                String val = cell.getStringCellValue();
                if (val == null || val.trim().length() == 0) {
        
                    return "";
                }
                return val.trim();
            }
            // 数字类型
            if (cell.getCellTypeEnum() == CellType.NUMERIC) {
        
                String s = cell.getNumericCellValue() + "";
                // 去掉尾巴上的小数点0
                if (Pattern.matches(".*\\.0*", s)) {
        
                    return s.split("\\.")[0];
                } else {
        
                    return s;
                }
            }
            // 布尔值类型
            if (cell.getCellTypeEnum() == CellType.BOOLEAN) {
        
                return cell.getBooleanCellValue() + "";
            }
            // 错误类型
            return cell.getCellFormula();
        }
    
        public static <T> void exportTemplate(HttpServletResponse response, String fileName, Class<T> clazz) {
        
            exportTemplate(response, fileName, fileName, clazz, false);
        }
    
        public static <T> void exportTemplate(HttpServletResponse response, String fileName, String sheetName,
                                              Class<T> clazz) {
        
            exportTemplate(response, fileName, sheetName, clazz, false);
        }
    
        public static <T> void exportTemplate(HttpServletResponse response, String fileName, Class<T> clazz,
                                              boolean isContainExample) {
        
            exportTemplate(response, fileName, fileName, clazz, isContainExample);
        }
    
        public static <T> void exportTemplate(HttpServletResponse response, String fileName, String sheetName,
                                              Class<T> clazz, boolean isContainExample) {
        
            // 获取表头字段
            List<ExcelClassField> headFieldList = getExcelClassFieldList(clazz);
            // 获取表头数据和示例数据
            List<List<Object>> sheetDataList = new ArrayList<>();
            List<Object> headList = new ArrayList<>();
            List<Object> exampleList = new ArrayList<>();
            Map<Integer, List<String>> selectMap = new LinkedHashMap<>();
            for (int i = 0; i < headFieldList.size(); i++) {
        
                ExcelClassField each = headFieldList.get(i);
                headList.add(each.getName());
                exampleList.add(each.getExample());
                LinkedHashMap<String, String> kvMap = each.getKvMap();
                if (kvMap != null && kvMap.size() > 0) {
        
                    selectMap.put(i, new ArrayList<>(kvMap.values()));
                }
            }
            sheetDataList.add(headList);
            if (isContainExample) {
        
                sheetDataList.add(exampleList);
            }
            // 导出数据
            export(response, fileName, sheetName, sheetDataList, selectMap);
        }
    
        private static <T> List<ExcelClassField> getExcelClassFieldList(Class<T> clazz) {
        
            // 解析所有字段
            Field[] fields = clazz.getDeclaredFields();
            boolean hasExportAnnotation = false;
            Map<Integer, List<ExcelClassField>> map = new LinkedHashMap<>();
            List<Integer> sortList = new ArrayList<>();
            for (Field field : fields) {
        
                ExcelClassField cf = getExcelClassField(field);
                if (cf.getHasAnnotation() == 1) {
        
                    hasExportAnnotation = true;
                }
                int sort = cf.getSort();
                if (map.containsKey(sort)) {
        
                    map.get(sort).add(cf);
                } else {
        
                    List<ExcelClassField> list = new ArrayList<>();
                    list.add(cf);
                    sortList.add(sort);
                    map.put(sort, list);
                }
            }
            Collections.sort(sortList);
            // 获取表头
            List<ExcelClassField> headFieldList = new ArrayList<>();
            if (hasExportAnnotation) {
        
                for (Integer sort : sortList) {
        
                    for (ExcelClassField cf : map.get(sort)) {
        
                        if (cf.getHasAnnotation() == 1) {
        
                            headFieldList.add(cf);
                        }
                    }
                }
            } else {
        
                headFieldList.addAll(map.get(0));
            }
            return headFieldList;
        }
    
        private static ExcelClassField getExcelClassField(Field field) {
        
            ExcelClassField cf = new ExcelClassField();
            String fieldName = field.getName();
            cf.setFieldName(fieldName);
            ExcelExport annotation = field.getAnnotation(ExcelExport.class);
            // 无 ExcelExport 注解情况
            if (annotation == null) {
        
                cf.setHasAnnotation(0);
                cf.setName(fieldName);
                cf.setSort(0);
                return cf;
            }
            // 有 ExcelExport 注解情况
            cf.setHasAnnotation(1);
            cf.setName(annotation.value());
            String example = getString(annotation.example());
            if (!example.isEmpty()) {
        
                if (isNumeric(example) && example.length() < 8) {
        
                    cf.setExample(Double.valueOf(example));
                } else {
        
                    cf.setExample(example);
                }
            } else {
        
                cf.setExample("");
            }
            cf.setSort(annotation.sort());
            // 解析映射
            String kv = getString(annotation.kv());
            cf.setKvMap(getKvMap(kv));
            return cf;
        }
    
        private static LinkedHashMap<String, String> getKvMap(String kv) {
        
            LinkedHashMap<String, String> kvMap = new LinkedHashMap<>();
            if (kv.isEmpty()) {
        
                return kvMap;
            }
            String[] kvs = kv.split(";");
            if (kvs.length == 0) {
        
                return kvMap;
            }
            for (String each : kvs) {
        
                String[] eachKv = getString(each).split("<=>");
                if (eachKv.length != 2) {
        
                    continue;
                }
                String k = eachKv[0];
                String v = eachKv[1];
                if (k.isEmpty() || v.isEmpty()) {
        
                    continue;
                }
                kvMap.put(k, v);
            }
            return kvMap;
        }
    
        /**
         * 导出表格到本地
         *
         * @param file      本地文件对象
         * @param sheetData 导出数据
         */
        public static void exportFile(File file, List<List<Object>> sheetData) {
        
            if (file == null) {
        
                System.out.println("文件创建失败");
                return;
            }
            if (sheetData == null) {
        
                sheetData = new ArrayList<>();
            }
            Map<String, List<List<Object>>> map = new HashMap<>();
            map.put(file.getName(), sheetData);
            export(null, file, file.getName(), map, null);
        }
    
        /**
         * 导出表格到本地
         *
         * @param <T>      导出数据类似，和K类型保持一致
         * @param filePath 文件父路径（如：D:/doc/excel/）
         * @param fileName 文件名称（不带尾缀，如：学生表）
         * @param list     导出数据
         * @throws IOException IO异常
         */
        public static <T> File exportFile(String filePath, String fileName, List<T> list) throws IOException {
        
            File file = getFile(filePath, fileName);
            List<List<Object>> sheetData = getSheetData(list);
            exportFile(file, sheetData);
            return file;
        }
    
        /**
         * 获取文件
         *
         * @param filePath filePath 文件父路径（如：D:/doc/excel/）
         * @param fileName 文件名称（不带尾缀，如：用户表）
         * @return 本地File文件对象
         */
        private static File getFile(String filePath, String fileName) throws IOException {
        
            String dirPath = getString(filePath);
            String fileFullPath;
            if (dirPath.isEmpty()) {
        
                fileFullPath = fileName;
            } else {
        
                // 判定文件夹是否存在，如果不存在，则级联创建
                File dirFile = new File(dirPath);
                if (!dirFile.exists()) {
        
                    boolean mkdirs = dirFile.mkdirs();
                    if (!mkdirs) {
        
                        return null;
                    }
                }
                // 获取文件夹全名
                if (dirPath.endsWith(String.valueOf(LEAN_LINE))) {
        
                    fileFullPath = dirPath + fileName + XLSX;
                } else {
        
                    fileFullPath = dirPath + LEAN_LINE + fileName + XLSX;
                }
            }
            System.out.println(fileFullPath);
            File file = new File(fileFullPath);
            if (!file.exists()) {
        
                boolean result = file.createNewFile();
                if (!result) {
        
                    return null;
                }
            }
            return file;
        }
    
        private static <T> List<List<Object>> getSheetData(List<T> list) {
        
            // 获取表头字段
            List<ExcelClassField> excelClassFieldList = getExcelClassFieldList(list.get(0).getClass());
            List<String> headFieldList = new ArrayList<>();
            List<Object> headList = new ArrayList<>();
            Map<String, ExcelClassField> headFieldMap = new HashMap<>();
            for (ExcelClassField each : excelClassFieldList) {
        
                String fieldName = each.getFieldName();
                headFieldList.add(fieldName);
                headFieldMap.put(fieldName, each);
                headList.add(each.getName());
            }
            // 添加表头名称
            List<List<Object>> sheetDataList = new ArrayList<>();
            sheetDataList.add(headList);
            // 获取表数据
            for (T t : list) {
        
                Map<String, Object> fieldDataMap = getFieldDataMap(t);
                Set<String> fieldDataKeys = fieldDataMap.keySet();
                List<Object> rowList = new ArrayList<>();
                for (String headField : headFieldList) {
        
                    if (!fieldDataKeys.contains(headField)) {
        
                        continue;
                    }
                    Object data = fieldDataMap.get(headField);
                    if (data == null) {
        
                        rowList.add("");
                        continue;
                    }
                    ExcelClassField cf = headFieldMap.get(headField);
                    // 判断是否有映射关系
                    LinkedHashMap<String, String> kvMap = cf.getKvMap();
                    if (kvMap == null || kvMap.isEmpty()) {
        
                        rowList.add(data);
                        continue;
                    }
                    String val = kvMap.get(data.toString());
                    if (isNumeric(val)) {
        
                        rowList.add(Double.valueOf(val));
                    } else {
        
                        rowList.add(val);
                    }
                }
                sheetDataList.add(rowList);
            }
            return sheetDataList;
        }
    
        private static <T> Map<String, Object> getFieldDataMap(T t) {
        
            Map<String, Object> map = new HashMap<>();
            Field[] fields = t.getClass().getDeclaredFields();
            try {
        
                for (Field field : fields) {
        
                    String fieldName = field.getName();
                    field.setAccessible(true);
                    Object object = field.get(t);
                    map.put(fieldName, object);
                }
            } catch (IllegalArgumentException | IllegalAccessException e) {
        
                e.printStackTrace();
            }
            return map;
        }
    
        public static void exportEmpty(HttpServletResponse response, String fileName) {
        
            List<List<Object>> sheetDataList = new ArrayList<>();
            List<Object> headList = new ArrayList<>();
            headList.add("导出无数据");
            sheetDataList.add(headList);
            export(response, fileName, sheetDataList);
        }
    
        public static void export(HttpServletResponse response, String fileName, List<List<Object>> sheetDataList) {
        
            export(response, fileName, fileName, sheetDataList, null);
        }
    
        public static void exportManySheet(HttpServletResponse response, String fileName, Map<String, List<List<Object>>> sheetMap) {
        
            export(response, null, fileName, sheetMap, null);
        }
    
    
        public static void export(HttpServletResponse response, String fileName, String sheetName,
                                  List<List<Object>> sheetDataList) {
        
            export(response, fileName, sheetName, sheetDataList, null);
        }
    
        public static void export(HttpServletResponse response, String fileName, String sheetName,
                                  List<List<Object>> sheetDataList, Map<Integer, List<String>> selectMap) {
        
    
            Map<String, List<List<Object>>> map = new HashMap<>();
            map.put(sheetName, sheetDataList);
            export(response, null, fileName, map, selectMap);
        }
    
        public static <T, K> void export(HttpServletResponse response, String fileName, List<T> list, Class<K> template) {
        
            // list 是否为空
            boolean lisIsEmpty = list == null || list.isEmpty();
            // 如果模板数据为空，且导入的数据为空，则导出空文件
            if (template == null && lisIsEmpty) {
        
                exportEmpty(response, fileName);
                return;
            }
            // 如果 list 数据，则导出模板数据
            if (lisIsEmpty) {
        
                exportTemplate(response, fileName, template);
                return;
            }
            // 导出数据
            List<List<Object>> sheetDataList = getSheetData(list);
            export(response, fileName, sheetDataList);
        }
    
        public static void export(HttpServletResponse response, String fileName, List<List<Object>> sheetDataList, Map<Integer, List<String>> selectMap) {
        
            export(response, fileName, fileName, sheetDataList, selectMap);
        }
    
        private static void export(HttpServletResponse response, File file, String fileName,
                                   Map<String, List<List<Object>>> sheetMap, Map<Integer, List<String>> selectMap) {
        
            // 整个 Excel 表格 book 对象
            SXSSFWorkbook book = new SXSSFWorkbook();
            // 每个 Sheet 页
            Set<Entry<String, List<List<Object>>>> entries = sheetMap.entrySet();
            for (Entry<String, List<List<Object>>> entry : entries) {
        
                List<List<Object>> sheetDataList = entry.getValue();
                Sheet sheet = book.createSheet(entry.getKey());
                Drawing<?> patriarch = sheet.createDrawingPatriarch();
                // 设置表头背景色（白色）
                CellStyle headStyle = book.createCellStyle();
                //headStyle.setFillForegroundColor(IndexedColors.RED1.index);
                //headStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
                headStyle.setAlignment(HorizontalAlignment.CENTER);//左中右
                headStyle.setVerticalAlignment(VerticalAlignment.CENTER);//上中下
                // headStyle.setFillForegroundColor(IndexedColors.WHITE.index);
                //设置表头字体
                Font headFont = book.createFont();
                headFont.setBold(true);
                headFont.setFontName("微软雅黑");
                headFont.setFontHeightInPoints((short) 10);
                headStyle.setFont(headFont);
                // 设置表身背景色（默认色）
                CellStyle rowStyle = book.createCellStyle();
                Font rowFont = book.createFont();
                rowFont.setFontName("微软雅黑");
                rowFont.setFontHeightInPoints((short) 10);
                rowStyle.setFont(rowFont);
                rowStyle.setAlignment(HorizontalAlignment.LEFT);//左中右
                rowStyle.setVerticalAlignment(VerticalAlignment.CENTER);//上中下
                // 设置表格列宽度（默认为15个字节）
                sheet.setDefaultColumnWidth(26);
                // 创建合并算法数组
                int rowLength = sheetDataList.size();
                int columnLength = sheetDataList.get(0).size();
                int[][] mergeArray = new int[rowLength][columnLength];
                for (int i = 0; i < sheetDataList.size(); i++) {
        
                    // 每个 Sheet 页中的行数据
                    Row row = sheet.createRow(i);
                    List<Object> rowList = sheetDataList.get(i);
                    for (int j = 0; j < rowList.size(); j++) {
        
                        // 每个行数据中的单元格数据
                        Object o = rowList.get(j);
                        int v = 0;
                        if (o instanceof URL) {
        
                            // 如果要导出图片的话, 链接需要传递 URL 对象
                            setCellPicture(book, row, patriarch, i, j, (URL) o);
                        } else {
        
                            Cell cell = row.createCell(j);
                            if (i == 0) {
        
                                // 第一行为表头行，默认白底色
                                v = setCellValue(cell, o, headStyle);
                            } else {
        
                                // 其他行为数据行，默认白底色
                                v = setCellValue(cell, o, rowStyle);
                            }
                        }
                        mergeArray[i][j] = v;
                    }
                }
                // 合并单元格
                mergeCells(sheet, mergeArray);
                // 设置下拉列表
                setSelect(sheet, selectMap);
            }
            // 写数据
            if (response != null) {
        
                // 前端导出
                try {
        
                    write(response, book, fileName);
                } catch (IOException e) {
        
                    e.printStackTrace();
                }
            } else {
        
                // 本地导出
                FileOutputStream fos;
                try {
        
                    fos = new FileOutputStream(file);
                    ByteArrayOutputStream ops = new ByteArrayOutputStream();
                    book.write(ops);
                    fos.write(ops.toByteArray());
                    fos.close();
                } catch (Exception e) {
        
                    e.printStackTrace();
                }
            }
        }
    
        /**
         * 合并当前Sheet页的单元格
         *
         * @param sheet      当前 sheet 页
         * @param mergeArray 合并单元格算法
         */
        private static void mergeCells(Sheet sheet, int[][] mergeArray) {
        
            // 横向合并
            for (int x = 0; x < mergeArray.length; x++) {
        
                int[] arr = mergeArray[x];
                boolean merge = false;
                int y1 = 0;
                int y2 = 0;
                for (int y = 0; y < arr.length; y++) {
        
                    int value = arr[y];
                    if (value == CELL_COLUMN_MERGE) {
        
                        if (!merge) {
        
                            y1 = y;
                        }
                        y2 = y;
                        merge = true;
                    } else {
        
                        merge = false;
                        if (y1 > 0) {
        
                            sheet.addMergedRegion(new CellRangeAddress(x, x, (y1 - 1), y2));
                        }
                        y1 = 0;
                        y2 = 0;
                    }
                }
                if (y1 > 0) {
        
                    sheet.addMergedRegion(new CellRangeAddress(x, x, (y1 - 1), y2));
                }
            }
            // 纵向合并
            int xLen = mergeArray.length;
            int yLen = mergeArray[0].length;
            for (int y = 0; y < yLen; y++) {
        
                boolean merge = false;
                int x1 = 0;
                int x2 = 0;
                for (int x = 0; x < xLen; x++) {
        
                    int value = mergeArray[x][y];
                    if (value == CELL_ROW_MERGE) {
        
                        if (!merge) {
        
                            x1 = x;
                        }
                        x2 = x;
                        merge = true;
                    } else {
        
                        merge = false;
                        if (x1 > 0) {
        
                            sheet.addMergedRegion(new CellRangeAddress((x1 - 1), x2, y, y));
                        }
                        x1 = 0;
                        x2 = 0;
                    }
                }
                if (x1 > 0) {
        
                    sheet.addMergedRegion(new CellRangeAddress((x1 - 1), x2, y, y));
                }
            }
        }
    
        private static void write(HttpServletResponse response, SXSSFWorkbook book, String fileName) throws IOException {
        
            response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
            response.setCharacterEncoding("utf-8");
            String name = new String(fileName.getBytes("GBK"), "ISO8859_1") + XLSX;
            response.addHeader("Content-Disposition", "attachment;filename=" + name);
            ServletOutputStream out = response.getOutputStream();
            book.write(out);
            out.flush();
            out.close();
        }
    
        private static int setCellValue(Cell cell, Object o, CellStyle style) {
        
            // 设置样式
            cell.setCellStyle(style);
            // 数据为空时
            if (o == null) {
        
                cell.setCellType(CellType.STRING);
                cell.setCellValue("");
                return CELL_OTHER;
            }
            // 是否为字符串
            if (o instanceof String) {
        
                String s = o.toString();
                // 当数字类型长度超过8位时，改为字符串类型显示（Excel数字超过一定长度会显示为科学计数法）
                if ("null".equals(s)) {
        
                    cell.setCellType(CellType.STRING);
                    cell.setCellValue("");
                    return CELL_OTHER;
                }
                if (isNumeric(s) && s.length() < 8 && s.length() > 0) {
        
                    cell.setCellType(CellType.NUMERIC);
                    cell.setCellValue(Double.parseDouble(s));
                    return CELL_OTHER;
                } else {
        
                    cell.setCellType(CellType.STRING);
                    cell.setCellValue(s);
                }
                if (s.equals(ROW_MERGE)) {
        
                    return CELL_ROW_MERGE;
                } else if (s.equals(COLUMN_MERGE)) {
        
                    return CELL_COLUMN_MERGE;
                } else {
        
                    return CELL_OTHER;
                }
            }
            // 是否为字符串
            if (o instanceof Integer || o instanceof Long || o instanceof Double || o instanceof Float) {
        
                cell.setCellType(CellType.NUMERIC);
                cell.setCellValue(Double.parseDouble(o.toString()));
                return CELL_OTHER;
            }
            // 是否为Boolean
            if (o instanceof Boolean) {
        
                cell.setCellType(CellType.BOOLEAN);
                cell.setCellValue((Boolean) o);
                return CELL_OTHER;
            }
            // 如果是BigDecimal，则默认3位小数
            if (o instanceof BigDecimal) {
        
                cell.setCellType(CellType.NUMERIC);
                cell.setCellValue(((BigDecimal) o).setScale(3, RoundingMode.HALF_UP).doubleValue());
                return CELL_OTHER;
            }
            // 如果是Date数据，则显示格式化数据
            if (o instanceof Date) {
        
                cell.setCellType(CellType.STRING);
                cell.setCellValue(formatDate((Date) o));
                return CELL_OTHER;
            }
            // 如果是其他，则默认字符串类型
            cell.setCellType(CellType.STRING);
            cell.setCellValue(o.toString());
            return CELL_OTHER;
        }
    
        private static void setCellPicture(SXSSFWorkbook wb, Row sr, Drawing<?> patriarch, int x, int y, URL url) {
        
            // 设置图片宽高
            sr.setHeight((short) (IMG_WIDTH * IMG_HEIGHT));
            // （jdk1.7版本try中定义流可自动关闭）
            try (InputStream is = url.openStream(); ByteArrayOutputStream outputStream = new ByteArrayOutputStream()) {
        
                byte[] buff = new byte[BYTES_DEFAULT_LENGTH];
                int rc;
                while ((rc = is.read(buff, 0, BYTES_DEFAULT_LENGTH)) > 0) {
        
                    outputStream.write(buff, 0, rc);
                }
                // 设置图片位置
                XSSFClientAnchor anchor = new XSSFClientAnchor(0, 0, 0, 0, y, x, y + 1, x + 1);
                // 设置这个，图片会自动填满单元格的长宽
                anchor.setAnchorType(ClientAnchor.AnchorType.MOVE_AND_RESIZE);
                patriarch.createPicture(anchor, wb.addPicture(outputStream.toByteArray(), HSSFWorkbook.PICTURE_TYPE_JPEG));
            } catch (Exception e) {
        
                e.printStackTrace();
            }
        }
    
        private static String formatDate(Date date) {
        
            if (date == null) {
        
                return "";
            }
            SimpleDateFormat format = new SimpleDateFormat(DATE_FORMAT);
            return format.format(date);
        }
    
        private static void setSelect(Sheet sheet, Map<Integer, List<String>> selectMap) {
        
            if (selectMap == null || selectMap.isEmpty()) {
        
                return;
            }
            Set<Entry<Integer, List<String>>> entrySet = selectMap.entrySet();
            for (Entry<Integer, List<String>> entry : entrySet) {
        
                int y = entry.getKey();
                List<String> list = entry.getValue();
                if (list == null || list.isEmpty()) {
        
                    continue;
                }
                String[] arr = new String[list.size()];
                for (int i = 0; i < list.size(); i++) {
        
                    arr[i] = list.get(i);
                }
                DataValidationHelper helper = sheet.getDataValidationHelper();
                CellRangeAddressList addressList = new CellRangeAddressList(1, 65000, y, y);
                DataValidationConstraint dvc = helper.createExplicitListConstraint(arr);
                DataValidation dv = helper.createValidation(dvc, addressList);
                if (dv instanceof HSSFDataValidation) {
        
                    dv.setSuppressDropDownArrow(false);
                } else {
        
                    dv.setSuppressDropDownArrow(true);
                    dv.setShowErrorBox(true);
                }
                sheet.addValidationData(dv);
            }
        }
    
        private static boolean isNumeric(String str) {
        
            if (Objects.isNull(str)) {
        
                return false;
            }
            if (Objects.nonNull(str) && "0.0".equals(str)) {
        
                return true;
            }
            for (int i = str.length(); --i >= 0; ) {
        
                if (!Character.isDigit(str.charAt(i))) {
        
                    return false;
                }
            }
            return true;
        }
    
        private static String getString(String s) {
        
            if (s == null) {
        
                return "";
            }
            if (s.isEmpty()) {
        
                return s;
            }
            return s.trim();
        }
    
    }

测试  
![在这里插入图片描述][b09c4b4f6d9e443fb52f5c0e5a8647ca.png]![在这里插入图片描述][65ff62d35f1541ed9001fc330cff1265.png]

## 三、基于模板的方式导出 ##

一共需要以下几个文件：  
工具类TemplateExcelUtils  
一个excel模板  
模板类：这里根据业务暂时创建一个AgentTpl

#### 所需依赖 ####

#### TemplateExcelUtils 工具类： ####

import net.sf.jxls.transformer.XLSTransformer;
    import org.apache.poi.ss.usermodel.Workbook;
    
    
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.OutputStream;
    import java.net.URLEncoder;
    import java.util.Map;
    
    /**
     * 根据Excel模板导出可以采用该工具类
     */
    public class TemplateExcelUtils {
        
        /**
         * 根据模板导出数据
         * @param fileName
         * @param sourcePath resource/template文件夹下路径
         * @param beanParams
         * @param response
         * @throws Exception
         */
        public static void downLoadExcel(String fileName, String sourcePath, Map<String, Object> beanParams, HttpServletResponse response)
                throws Exception {
        
            try{
        
                OutputStream os = getOutputStream(fileName,response);
                //读取模板
                InputStream is = TemplateExcelUtils.class.getClassLoader().getResourceAsStream("excelTemplate/"+sourcePath);
                XLSTransformer transformer = new XLSTransformer();
                //向模板中写入内容
                Workbook workbook = transformer.transformXLS(is, beanParams);
                //写入成功后转化为输出流
                workbook.write(os);
            }catch (Exception e){
        
                e.printStackTrace();
                throw e;
            }
        }
    
        /**
         * 导出文件时为Writer生成OutputStream.
         * @param fileName 文件名
         * @param response response
         * @return ""
         */
        private static OutputStream getOutputStream(String fileName,
                                                    HttpServletResponse response) throws Exception {
        
            try {
        
                fileName = URLEncoder.encode(fileName, "UTF-8");
                response.setContentType("application/vnd.ms-excel");
                response.setCharacterEncoding("utf8");
                response.setHeader("Content-Disposition", "attachment; filename=" + fileName + ".xlsx");
                response.setHeader("Pragma", "public");
                response.setHeader("Cache-Control", "no-store");
                response.addHeader("Cache-Control", "max-age=0");
                return response.getOutputStream();
            } catch (IOException e) {
        
                throw new Exception("导出excel表格失败!", e);
            }
        }
    
    }

#### excel模板 ####

位置放在resource/excelTemplate  
![在这里插入图片描述][bd94aef6e8ad4530a1c48fa69f52a117.png]  
![在这里插入图片描述][887f1b69d92f40fa8cd69020b6422e6a.png]

#### controller代码 ####

@RestController
    @RequestMapping("/statistics")
    public class TestExportExcel {
        
    
        @Resource
        private TestExportExcelService testExportExcelService;
    
        @PostMapping(value = "/export/excel", produces = MediaType.APPLICATION_JSON_VALUE)
        public Boolean exportExcel(HttpServletResponse response) {
        
            testExportExcelService.testExportExcel3(response);
            return true;
        }
    }

#### service代码 ####

@Override
        public void testExportExcel3(HttpServletResponse response) {
        
            List<AgentTpl> list = new ArrayList<>();
    
            AgentTpl agentTpl = new AgentTpl();
            agentTpl.setId(1L);
            agentTpl.setName("哈尔滨工业集团");
            agentTpl.setMobile("13800138000");
            list.add(agentTpl);
    
            AgentTpl agentTpl1 = new AgentTpl();
            agentTpl1.setId(2L);
            agentTpl1.setName("万科工业集团");
            agentTpl1.setMobile("13600136000");
            list.add(agentTpl1);
    
            try {
        
                Map<String, Object> param = new HashMap<>();
                param.put("title", "代理商数据");
                param.put("list", list);
                TemplateExcelUtils.downLoadExcel("代理商数据", "代理商数据.xlsx", param, response);
    
            } catch (Exception e) {
        
                throw new RuntimeException(e);
            }
    
        }

#### 测试结果 ####

![在这里插入图片描述][621f2ded7cfb4a42898e9311d5bef36a.png]

[f0d148815a254bf1a2b66e3ca24e824f.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/15/f1cda1b3dd6a4c6b9d68a99747cd4d49.png
[b09c4b4f6d9e443fb52f5c0e5a8647ca.png]: https://img-blog.csdnimg.cn/b09c4b4f6d9e443fb52f5c0e5a8647ca.png
[65ff62d35f1541ed9001fc330cff1265.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/15/4794f9f1dc79413ea1ef4f837af9d7fc.png
[bd94aef6e8ad4530a1c48fa69f52a117.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/15/140e681658bc48688cf86cf155d3aa39.png
[887f1b69d92f40fa8cd69020b6422e6a.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/15/95e996eac47942f4b12bd57fc050e929.png
[621f2ded7cfb4a42898e9311d5bef36a.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/15/570a7a1790db48e59a1a54b41cdd6dcf.png