springmvc+poi把数据导出Excel表

旧城等待， 2022-05-22 00:56 268阅读 0赞

### springmvc+pol把数据导出Excel表的步骤： ###

#### 1.在pom.xml中先加poi的依赖包： ####

<dependency>
        <groupId>org.apache.poi</groupId>
        <artifactId>poi-ooxml</artifactId>
        <version>3.14-beta1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.poi</groupId>
        <artifactId>poi-ooxml-schemas</artifactId>
        <version>3.14-beta1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.poi</groupId>
        <artifactId>poi</artifactId>
        <version>3.14-beta1</version>
    </dependency>
    <dependency>
        <groupId>org.apache.httpcomponents</groupId>
        <artifactId>httpclient</artifactId>
        <version>4.5.2</version>
    </dependency>

#### 2.编码： ####

导入导出Excel工具类：ExcelUtil.Class

package net.stxy.one.utils;
    
    import net.stxy.one.poi.ExcelBean;
    import org.apache.http.client.utils.DateUtils;
    import org.apache.poi.hssf.usermodel.HSSFWorkbook;
    import org.apache.poi.ss.usermodel.Cell;
    import org.apache.poi.ss.usermodel.Row;
    import org.apache.poi.ss.usermodel.Sheet;
    import org.apache.poi.ss.usermodel.Workbook;
    import org.apache.poi.ss.util.CellRangeAddress;
    import org.apache.poi.xssf.usermodel.*;
    
    import java.beans.IntrospectionException;
    import java.beans.PropertyDescriptor;
    import java.io.InputStream;
    import java.lang.reflect.InvocationTargetException;
    import java.lang.reflect.Method;
    import java.math.BigDecimal;
    import java.text.DecimalFormat;
    import java.text.NumberFormat;
    import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.util.ArrayList;
    import java.util.Date;
    import java.util.List;
    import java.util.Map;
    
    /**
     * Excel导入导出工具类
     * Created by ASUS on 2018/5/20
     *
     * @Authod Grey Wolf
     */
    public class ExcelUtil {
        private final static String excel2003L =".xls";    //2003- 版本的excel
        private final static String excel2007U =".xlsx";   //2007+ 版本的excel
        /**
         * Excel导入
         */
        public static  List<List<Object>> getBankListByExcel(InputStream in, String fileName) throws Exception{
            List<List<Object>> list = null;
            //创建Excel工作薄
            Workbook work = getWorkbook(in,fileName);
            if(null == work){
                throw new Exception("创建Excel工作薄为空！");
            }
            Sheet sheet = null;
            Row row = null;
            Cell cell = null;
            list = new ArrayList<List<Object>>();
            //遍历Excel中所有的sheet
            for (int i = 0; i < work.getNumberOfSheets(); i++) {
                sheet = work.getSheetAt(i);
                if(sheet==null){
      continue;}
                //遍历当前sheet中的所有行
                //包涵头部，所以要小于等于最后一列数,这里也可以在初始值加上头部行数，以便跳过头部
                for (int j = sheet.getFirstRowNum(); j <= sheet.getLastRowNum(); j++) {
                    //读取一行
                    row = sheet.getRow(j);
                    //去掉空行和表头
                    if(row==null||row.getFirstCellNum()==j){
      continue;}
                    //遍历所有的列
                    List<Object> li = new ArrayList<Object>();
                    for (int y = row.getFirstCellNum(); y < row.getLastCellNum(); y++) {
                        cell = row.getCell(y);
                        li.add(getCellValue(cell));
                    }
                    list.add(li);
                }
            }
            return list;
        }
        /**
         * 描述：根据文件后缀，自适应上传文件的版本
         */
        public static  Workbook getWorkbook(InputStream inStr,String fileName) throws Exception{
            Workbook wb = null;
            String fileType = fileName.substring(fileName.lastIndexOf("."));
            if(excel2003L.equals(fileType)){
                //2003-
                wb = new HSSFWorkbook(inStr);
            }else if(excel2007U.equals(fileType)){
                //2007+
                wb = new XSSFWorkbook(inStr);
            }else{
                throw new Exception("解析的文件格式有误！");
            }
            return wb;
        }
        /**
         * 描述：对表格中数值进行格式化
         */
        public static  Object getCellValue(Cell cell){
            Object value = null;
            //格式化字符类型的数字
            DecimalFormat df = new DecimalFormat("0");
            //日期格式化
            SimpleDateFormat sdf = new SimpleDateFormat("yyy-MM-dd");
            //格式化数字
            DecimalFormat df2 = new DecimalFormat("0.00");
            switch (cell.getCellType()) {
                case Cell.CELL_TYPE_STRING:
                    value = cell.getRichStringCellValue().getString();
                    break;
                case Cell.CELL_TYPE_NUMERIC:
                    if("General".equals(cell.getCellStyle().getDataFormatString())){
                        value = df.format(cell.getNumericCellValue());
                    }else if("m/d/yy".equals(cell.getCellStyle().getDataFormatString())){
                        value = sdf.format(cell.getDateCellValue());
                    }else{
                        value = df2.format(cell.getNumericCellValue());
                    }
                    break;
                case Cell.CELL_TYPE_BOOLEAN:
                    value = cell.getBooleanCellValue();
                    break;
                case Cell.CELL_TYPE_BLANK:
                    value = "";
                    break;
                default:
                    break;
            }
            return value;
        }
        /**
         * 导入Excel表结束
         * 导出Excel表开始
         * @param sheetName 工作簿名称
         * @param clazz  数据源model类型
         * @param objs   excel标题列以及对应model字段名
         * @param map  标题列行数以及cell字体样式
         */
        public static XSSFWorkbook createExcelFile(Class clazz, List objs, Map<Integer, List<ExcelBean>> map, String sheetName) throws
                IllegalArgumentException,IllegalAccessException,InvocationTargetException,
                ClassNotFoundException, IntrospectionException, ParseException {
            // 创建新的Excel工作簿
            XSSFWorkbook workbook = new XSSFWorkbook();
            // 在Excel工作簿中建一工作表，其名为缺省值, 也可以指定Sheet名称
            XSSFSheet sheet = workbook.createSheet(sheetName);
            // 以下为excel的字体样式以及excel的标题与内容的创建，下面会具体分析;
            //字体样式
            createFont(workbook);
            //创建标题（头）
            createTableHeader(sheet, map);
            //创建内容
            createTableRows(sheet, map, objs, clazz);
            return workbook;
        }
        private static XSSFCellStyle fontStyle;
        private static XSSFCellStyle fontStyle2;
        public static void createFont(XSSFWorkbook workbook) {
            // 表头
            fontStyle = workbook.createCellStyle();
            XSSFFont font1 = workbook.createFont();
            font1.setBoldweight(XSSFFont.BOLDWEIGHT_BOLD);
            font1.setFontName("黑体");
            // 设置字体大小
            font1.setFontHeightInPoints((short) 14);
            fontStyle.setFont(font1);
            // 下边框
            fontStyle.setBorderBottom(XSSFCellStyle.BORDER_THIN);
            // 左边框
            fontStyle.setBorderLeft(XSSFCellStyle.BORDER_THIN);
            // 上边框
            fontStyle.setBorderTop(XSSFCellStyle.BORDER_THIN);
            // 右边框
            fontStyle.setBorderRight(XSSFCellStyle.BORDER_THIN);
            // 居中
            fontStyle.setAlignment(XSSFCellStyle.ALIGN_CENTER);
            // 内容
            fontStyle2=workbook.createCellStyle();
            XSSFFont font2 = workbook.createFont();
            font2.setFontName("宋体");
            // 设置字体大小
            font2.setFontHeightInPoints((short) 10);
            fontStyle2.setFont(font2);
            // 下边框
            fontStyle2.setBorderBottom(XSSFCellStyle.BORDER_THIN);
            // 左边框
            fontStyle2.setBorderLeft(XSSFCellStyle.BORDER_THIN);
            // 上边框
            fontStyle2.setBorderTop(XSSFCellStyle.BORDER_THIN);
            // 右边框
            fontStyle2.setBorderRight(XSSFCellStyle.BORDER_THIN);
            // 居中
            fontStyle2.setAlignment(XSSFCellStyle.ALIGN_CENTER);
        }
        /**
         * 根据ExcelMapping 生成列头（多行列头）
         *
         * @param sheet 工作簿
         * @param map 每行每个单元格对应的列头信息
         */
        public static final void createTableHeader(XSSFSheet sheet, Map<Integer, List<ExcelBean>> map) {
            //cell起始位置
            int startIndex=0;
            //cell终止位置
            int endIndex=0;
            for (Map.Entry<Integer, List<ExcelBean>> entry : map.entrySet()) {
                XSSFRow row = sheet.createRow(entry.getKey());
                List<ExcelBean> excels = entry.getValue();
                for (int x = 0; x < excels.size(); x++) {
                    //合并单元格
                    if(excels.get(x).getCols()>1){
                        if(x==0){
                            endIndex+=excels.get(x).getCols()-1;
                            CellRangeAddress range=new CellRangeAddress(0,0,startIndex,endIndex);
                            sheet.addMergedRegion(range);
                            startIndex+=excels.get(x).getCols();
                        }else{
                            endIndex+=excels.get(x).getCols();
                            CellRangeAddress range=new CellRangeAddress(0,0,startIndex,endIndex);
                            sheet.addMergedRegion(range);
                            startIndex+=excels.get(x).getCols();
                        }
                        XSSFCell cell = row.createCell(startIndex-excels.get(x).getCols());
                        // 设置内容
                        cell.setCellValue(excels.get(x).getHeadTextName());
                        if (excels.get(x).getCellStyle() != null) {
                            // 设置格式
                            cell.setCellStyle(excels.get(x).getCellStyle());
                        }
                        cell.setCellStyle(fontStyle);
                    }else{
                        XSSFCell cell = row.createCell(x);
                        // 设置内容
                        cell.setCellValue(excels.get(x).getHeadTextName());
                        if (excels.get(x).getCellStyle() != null) {
                            // 设置格式
                            cell.setCellStyle(excels.get(x).getCellStyle());
                        }
                        cell.setCellStyle(fontStyle);
                    }
                }
            }
        }
        public static void createTableRows(XSSFSheet sheet, Map<Integer, List<ExcelBean>> map, List objs, Class clazz)
                throws IllegalArgumentException, IllegalAccessException, InvocationTargetException, IntrospectionException,
                ClassNotFoundException, ParseException {
            int rowindex = map.size();
            int maxKey = 0;
            List<ExcelBean> ems = new ArrayList<>();
            for (Map.Entry<Integer, List<ExcelBean>> entry : map.entrySet()) {
                if (entry.getKey() > maxKey) {
                    maxKey = entry.getKey();
                }
            }
            ems = map.get(maxKey);
            List<Integer> widths = new ArrayList<Integer>(ems.size());
            for (Object obj : objs) {
                XSSFRow row = sheet.createRow(rowindex);
                for (int i = 0; i < ems.size(); i++) {
                    ExcelBean em = (ExcelBean) ems.get(i);
                    // 获得get方法
                    PropertyDescriptor pd = new PropertyDescriptor(em.getPropertyName(), clazz);
                    Method getMethod = pd.getReadMethod();
                    Object rtn = getMethod.invoke(obj);
                    String value = "";
                    // 如果是日期类型进行转换
                    if (rtn != null) {
                        if (rtn instanceof Date) {
                            value = DateUtils.formatDate((Date)rtn,"yyyy-MM-dd");
                        } else if(rtn instanceof BigDecimal){
                            NumberFormat nf = new DecimalFormat("#,##0.00");
                            value=nf.format((BigDecimal)rtn).toString();
                        } else if((rtn instanceof Integer) && (Integer.valueOf(rtn.toString())<0 )){
                            value="--";
                        }else {
                            value = rtn.toString();
                        }
                    }
                    XSSFCell cell = row.createCell(i);
                    cell.setCellValue(value);
                    cell.setCellType(XSSFCell.CELL_TYPE_STRING);
                    cell.setCellStyle(fontStyle2);
                    // 获得最大列宽
                    int width = value.getBytes().length * 300;
                    // 还未设置，设置当前
                    if (widths.size() <= i) {
                        widths.add(width);
                        continue;
                    }
                    // 比原来大，更新数据
                    if (width > widths.get(i)) {
                        widths.set(i, width);
                    }
                }
                rowindex++;
            }
            // 设置列宽
            for (int index = 0; index < widths.size(); index++) {
                Integer width = widths.get(index);
                width = width < 2500 ? 2500 : width + 300;
                width = width > 10000 ? 10000 + 300 : width + 300;
                sheet.setColumnWidth(index, width);
            }
        }
    }

用到的bean:ExcelBean,ExcelClass

package net.stxy.one.poi;
    
    import org.apache.poi.xssf.usermodel.XSSFCellStyle;
    
    import java.io.Serializable;
    
    /**
     * Excel表格
     * Created by ASUS on 2018/5/20
     *
     * @Authod Grey Wolf
     */
    public class ExcelBean implements Serializable {
        //列头（标题）名
        private String headTextName;
        //对应字段名
        private String propertyName;
        //合并单元格数
        private Integer cols;
        //样式
        private XSSFCellStyle cellStyle;
        public ExcelBean(){
        }
        public ExcelBean(String headTextName, String propertyName){
            this.headTextName = headTextName;
            this.propertyName = propertyName;
        }
        public ExcelBean(String headTextName, String propertyName, Integer cols) {
            super();
            this.headTextName = headTextName;
            this.propertyName = propertyName;
            this.cols = cols;
        }
    
        public String getHeadTextName() {
            return headTextName;
        }
    
        public void setHeadTextName(String headTextName) {
            this.headTextName = headTextName;
        }
    
        public String getPropertyName() {
            return propertyName;
        }
    
        public void setPropertyName(String propertyName) {
            this.propertyName = propertyName;
        }
    
        public Integer getCols() {
            return cols;
        }
    
        public void setCols(Integer cols) {
            this.cols = cols;
        }
    
        public XSSFCellStyle getCellStyle() {
            return cellStyle;
        }
    
        public void setCellStyle(XSSFCellStyle cellStyle) {
            this.cellStyle = cellStyle;
        }
    }

package net.stxy.one.poi;
    
    import org.apache.poi.xssf.usermodel.XSSFWorkbook;
    
    import java.util.ArrayList;
    import java.util.LinkedHashMap;
    import java.util.List;
    import java.util.Map;
    
    /**
     * Excel表格对应的表头信息处理类
     * Created by ASUS on 2018/6/11
     *
     * @Authod Grey Wolf
     */
    public class ExcelClass {
    
        public  Map<Integer,List<ExcelBean>> contentExcel(){
            List<ExcelBean> excel=new ArrayList<>();
            Map<Integer,List<ExcelBean>> map=new LinkedHashMap<>();
            XSSFWorkbook xssfWorkbook=null;
            //设置标题栏
            excel.add(new ExcelBean("序号","id",0));
            excel.add(new ExcelBean("用户id","userid",0));
            excel.add(new ExcelBean("分享内容","content",0));
            excel.add(new ExcelBean("点赞数","nice",0));
            excel.add(new ExcelBean("创建时间","createtime",0));
            excel.add(new ExcelBean("图片1","pic1",0));
            excel.add(new ExcelBean("图片2","pic2",0));
            excel.add(new ExcelBean("图片3","pic3",0));
            map.put(0, excel);
            return map;
        }
    }

接口服务层service：

package net.stxy.one.service;
    
    import org.apache.poi.xssf.usermodel.XSSFWorkbook;
    
    import java.beans.IntrospectionException;
    import java.lang.reflect.InvocationTargetException;
    import java.text.ParseException;
    
    /**
     * Created by ASUS on 2018/5/20
     *
     * @Authod Grey Wolf
     */
    public interface ExcelService {
    
        /**
         * 导出Excel表格
         * @param salaryDate
         * @return
         * @throws InvocationTargetException
         * @throws ClassNotFoundException
         * @throws IntrospectionException
         * @throws ParseException
         * @throws IllegalAccessException
         */
        XSSFWorkbook exportExcelInfo(String salaryDate) throws InvocationTargetException, ClassNotFoundException, IntrospectionException, ParseException, IllegalAccessException;
    }

接口服务实现层serviceImpl：

package net.stxy.one.service.impl;
    
    import net.stxy.one.mapper.ContentMapper;
    import net.stxy.one.model.Content;
    import net.stxy.one.poi.ExcelBean;
    import net.stxy.one.poi.ExcelClass;
    import net.stxy.one.service.ExcelService;
    import net.stxy.one.utils.ExcelUtil;
    import org.apache.poi.xssf.usermodel.XSSFWorkbook;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    
    import java.beans.IntrospectionException;
    import java.lang.reflect.InvocationTargetException;
    import java.text.ParseException;
    import java.util.ArrayList;
    import java.util.LinkedHashMap;
    import java.util.List;
    import java.util.Map;
    
    /**
     * Excel实现类
     * Created by ASUS on 2018/5/20
     *
     * @Authod Grey Wolf
     */
    
    @Service("excelService")
    public class ExcelServiceImpl implements ExcelService {
    
        @Autowired
        private ContentMapper contentMapper;
    
        @Override
        public XSSFWorkbook exportExcelInfo(String salaryDate) throws InvocationTargetException, ClassNotFoundException, IntrospectionException, ParseException, IllegalAccessException {
            //根据条件查询数据，把数据装载到一个list中
            List<Content> list =contentMapper.selectAll();
            List<ExcelBean> excel=new ArrayList<>();
            Map<Integer,List<ExcelBean>> map=new ExcelClass().contentExcel();
            XSSFWorkbook xssfWorkbook=null;
            String sheetName = salaryDate + "分享内容";
            //调用ExcelUtil的方法
            xssfWorkbook = ExcelUtil.createExcelFile(Content.class, list, map, sheetName);
            return xssfWorkbook;
        }
    }

控制层controller：

package net.stxy.one.controller;
    
    import com.google.gson.JsonObject;
    import net.stxy.one.model.Content;
    import net.stxy.one.service.ExcelService;
    import org.apache.poi.xssf.usermodel.XSSFWorkbook;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestBody;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.bind.annotation.ResponseBody;
    
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.beans.IntrospectionException;
    import java.io.BufferedOutputStream;
    import java.io.IOException;
    import java.io.OutputStream;
    import java.lang.reflect.InvocationTargetException;
    import java.text.ParseException;
    import java.util.HashMap;
    import java.util.List;
    import java.util.Map;
    
    /**
     * Excel控制器
     * Created by ASUS on 2018/5/20
     *
     * @Authod Grey Wolf
     */
    
    @Controller
    public class ExcelController {
    
        @Autowired
        private ExcelService excelService;
    
    
        @RequestMapping("/exports")
        public void export(HttpServletRequest request, HttpServletResponse response) throws ClassNotFoundException, IntrospectionException, IllegalAccessException, ParseException, InvocationTargetException {
            System.out.println("excel导出开始");
            String salaryDate="1";
            System.out.println("list:"+salaryDate);
            if(salaryDate!=""){
                response.reset(); //清除buffer缓存
                Map<String,Object> map=new HashMap<String,Object>();
                System.out.println("文件名：");
                // 指定下载的文件名
                response.setHeader("Content-Disposition", "attachment;filename="+salaryDate+".xlsx");
                response.setContentType("application/vnd.ms-excel;charset=UTF-8");
                response.setHeader("Pragma", "no-cache");
                response.setHeader("Cache-Control", "no-cache");
                response.setDateHeader("Expires", 0);
                XSSFWorkbook workbook=null;
                //导出Excel对象
                workbook = excelService.exportExcelInfo(salaryDate);
                OutputStream output;
                try {
                    output = response.getOutputStream();
                    BufferedOutputStream bufferedOutPut = new BufferedOutputStream(output);
                    bufferedOutPut.flush();
                    workbook.write(bufferedOutPut);
                    bufferedOutPut.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }

前端页面：

![70][]

点击导出按钮：

<a class="layui-btn" href="<%=request.getContextPath()%>/exports">导出</a

显示效果：

![70 1][]

打开Excel显示下载的数据：

![70 2][]

我的座右铭：不会，我可以学；落后，我可以追赶；跌倒，我可以站起来；我一定行。

[70]: /images/20220522/2d363dc5cc5441789bf3b20f1180af73.png
[70 1]: /images/20220522/60a00f1772b540b28ccd7ee9b6ddef7c.png
[70 2]: /images/20220522/5be6fec397f347e7b2dcf000794e26ed.png