springboot+mybatis+vue导出指定的数据为excel（包含图片）

￡神魔★判官ぃ 2023-05-29 05:16 25阅读 0赞

前端：

<el-button @click="speedupCheckbox" @current-change="handleSelectionChange">批量导出二维码</el-button>
    
          handleSelectionChange (val) {
            this.multipleSelection = val
          },
    
          speedupCheckbox: function () {
            if (this.multipleSelection.length === 0) {
              this.$message({
                message: '请至少勾选一项，再进行操作',
                type: 'warning'
              })
            } else {
              this.exportData()
            }
          },
    
    exportCodeData () {
            this.$confirm('此操作将无法撤回, 是否继续?', '提示', {
              confirmButtonText: '确定',
              cancelButtonText: '取消',
              type: 'warning'
            }).then(() => {
              let arr = this.multipleSelection
              let multis = []
              for (let i = 0; i < arr.length; i++) {
                multis.push(arr[i].id)
                console.log(multis)
              }
              axios({
                method: 'POST',
                url: Config.context + '/userManager/exportData',
                data: multis,
                responseType: 'blob'
              }).then(response => {
                if (!response) {
                  return
                }
                const blob = new Blob([response.data])
                if (window.navigator && window.navigator.msSaveOrOpenBlob) {
                  navigator.msSaveBlob(blob, '数据_.xls')
                } else {
                  let u = window.URL.createObjectURL(response.data)
                  let aLink = document.createElement('a')
                  aLink.style.display = 'none'
                  aLink.href = u
                  aLink.setAttribute('download', '数据_.xls')
                  document.body.appendChild(aLink)
                  aLink.click()
                  document.body.removeChild(aLink)
                  window.URL.revokeObjectURL(u)
                }
              }).catch(error => {
                throw error
              })
              this.$refs.multipleTable.clearSelection()            // 操作完成清除勾选框
            })
          }

后端controller:

@RequestMapping("/exportData")
        public void exportHandConf(@RequestBody List<String> data, HttpServletRequest request,
                                                       HttpServletResponse response)
        {
    
            //查询需要导出的数据
            List<xxx> data1 = xxxDao.find(data);
    
            if (data1.size() != 0)
            {
                try
                {
                    String title = "信息";
                    String[] rowsName = new String[] { "序号","二维码", "昵称"};
                    List<Object[]> dataList = new ArrayList<>();
                    Object[] objs = null;
                    for (int i = 0; i < data1.size(); i++)
                    {
                        objs = new Object[rowsName.length];
                        objs[0] = i;
                        objs[1] = data1.get(i).getGroup_code();
                        objs[2] = data1.get(i).getNickname();
    
                        dataList.add(objs);
                    }
                    ExportExcelUtils ex = new ExportExcelUtils(title, rowsName, dataList, response);
                    ex.exportData();
                }
                catch (Exception e)
                {
                    e.printStackTrace();
    
                }
    
            }
    
        }

这里面是个动态sql:

xml:

<select id="find" parameterType="java.util.List" resultType="实体类路径">
            select * from xxx where 1 = 1
            <if test="xx!= null and xx.size() > 0">
                AND
                <foreach collection="xx" item="xxx" open="xxx in(" close=")" separator=",">
                    #{xxx}
                </foreach>
            </if>
        </select>

dao:

List<xxx> find(@Param("xx") List<String> xxx);

service:

import org.apache.poi.hssf.usermodel.*;
    import org.apache.poi.hssf.util.HSSFColor;
    import org.apache.poi.ss.util.CellRangeAddress;
    import sun.misc.BASE64Decoder;
    
    import javax.servlet.http.HttpServletResponse;
    import java.io.ByteArrayOutputStream;
    import java.io.IOException;
    import java.io.InputStream;
    import java.io.OutputStream;
    import java.net.HttpURLConnection;
    import java.net.URL;
    import java.net.URLDecoder;
    import java.net.URLEncoder;
    import java.util.ArrayList;
    import java.util.List;
    
    /**
     * poi导出
     * @author yangjaibin
     *
     */
    public class ExportExcelUtils {
        private String title; // 导出表格的表名
    
        private String[] rowName;// 导出表格的列名
    
        private List<Object[]> dataList = new ArrayList<Object[]>(); // 对象数组的List集合
    
        private HttpServletResponse response;
    
        // 传入要导入的数据
        public ExportExcelUtils(String title, String[] rowName, List<Object[]> dataList, HttpServletResponse response)
        {
            this.title = title;
            this.rowName = rowName;
            this.dataList = dataList;
            this.response = response;
        }
    
        // 导出数据
        public void exportData()
        {
            try
            {
                HSSFWorkbook workbook = new HSSFWorkbook(); // 创建一个excel对象
                HSSFSheet sheet = workbook.createSheet(title); // 创建表格
                HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
                // 产生表格标题行
                HSSFRow rowm = sheet.createRow(0);  // 行
                HSSFCell cellTiltle = rowm.createCell(0);  // 单元格
                // sheet样式定义
                HSSFCellStyle columnTopStyle = this.getColumnTopStyle(workbook); // 头样式
                HSSFCellStyle style = this.getStyle(workbook);  // 单元格样式
                /**
                 * 参数说明
                 * 从0开始   第一行 第一列 都是从角标0开始
                 * 行 列 行列    (0,0,0,5)  合并第一行 第一列  到第一行 第六列
                 * 起始行，起始列，结束行，结束列
                 *
                 * new Region()  这个方法使过时的
                 */
                // 合并第一行的所有列
                sheet.addMergedRegion(new CellRangeAddress(0, (short) 0, 0, (short) (rowName.length - 1)));
                cellTiltle.setCellStyle(columnTopStyle);
                cellTiltle.setCellValue(title);
    
                int columnNum = rowName.length;  // 表格列的长度
                HSSFRow rowRowName = sheet.createRow(1);  // 在第二行创建行
                HSSFCellStyle cells = workbook.createCellStyle();
                cells.setBottomBorderColor(HSSFColor.BLACK.index);
                rowRowName.setRowStyle(cells);
    
                // 循环 将列名放进去
                for (int i = 0; i < columnNum; i++)
                {
                    HSSFCell cellRowName = rowRowName.createCell((int) i);
                    cellRowName.setCellType(HSSFCell.CELL_TYPE_STRING); // 单元格类型
    
                    HSSFRichTextString text = new HSSFRichTextString(rowName[i]);  // 得到列的值
                    cellRowName.setCellValue(text); // 设置列的值
                    cellRowName.setCellStyle(columnTopStyle); // 样式
                }
    
                // 将查询到的数据设置到对应的单元格中
                for (int i = 0; i < dataList.size(); i++)
                {
                    Object[] obj = dataList.get(i);//遍历每个对象
                    HSSFRow row = sheet.createRow(i + 2);//创建所需的行数
                    row.setHeightInPoints(40);
    
                    for (int j = 0; j < obj.length; j++)
                    {
                        HSSFCell cell = null;   //设置单元格的数据类型
                        if (j == 0)
                        {
                            // 第一列设置为序号
                            cell = row.createCell(j);
                            cell.setCellValue(i + 1);
                        }
                        else
                        {
                            cell = row.createCell(j);
    
                            if (!"".equals(obj[j]) && obj[j] != null)
                            {
                                if (obj[j].toString().length() > 30)
                                {
                                    cell.setCellValue("  ");
                                    drawPictureInfoExcel(workbook, patriarch, obj[j].toString(), i + 2);//i+2代表当前的行
                                }
                                else
                                {
                                    cell.setCellValue(obj[j].toString());
                                }
                                //设置单元格的值
                            }
                            else
                            {
                                cell.setCellValue("  ");
                            }
    
                        }
                        cell.setCellStyle(style); // 样式
                    }
                }
                //  让列宽随着导出的列长自动适应
    
                sheet.setColumnWidth(0, 8 * 256);  //调整第一列宽度
                sheet.setColumnWidth(1, 8 * 256);
                sheet.setColumnWidth(2, 20 * 256);  ///调整第二列宽度
                sheet.setColumnWidth(3, 20 * 256);
                sheet.setColumnWidth(4, 20 * 256);
                sheet.setColumnWidth(5, 21 * 256);
                sheet.setColumnWidth(6, 20 * 256);
    
                if (workbook != null)
                {
                    try
                    {
                        // excel 表文件名
                        String fileName = title + String.valueOf(System.currentTimeMillis()).substring(4, 13) + ".xls";
                        String fileName11 = URLEncoder.encode(fileName, "UTF-8");
                        String fileName12 = URLDecoder.decode(fileName11, "UTF-8");
                        String headStr = "attachment; filename=\"" + fileName12 + "\"";
                        response.setContentType("APPLICATION/OCTET-STREAM");
                        // response.setHeader("Content-Disposition", headStr);
                        response.setHeader("Content-Disposition",
                                "attachment;filename=" + new String(fileName12.getBytes("gb2312"), "ISO8859-1"));
                        OutputStream out = response.getOutputStream();
                        workbook.write(out);
                        out.flush();
                        out.close();
                    }
                    catch (IOException e)
                    {
                        e.printStackTrace();
                    }
    
                }
    
            }
            catch (Exception e)
            {
                e.printStackTrace();
            }
    
        }
    
        private void drawPictureInfoExcel(HSSFWorkbook wb, HSSFPatriarch patriarch, String pictureUrl, int rowIndex)
        {
            //rowIndex代表当前行
            try
            {
                if (pictureUrl != null)
                {
    
    //                URL url = new URL(pictureUrl);//获取人员照片的地址
    //                //打开链接
    //                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    //                //设置请求方式为"GET"
    //                conn.setRequestMethod("GET");
    //                //超时响应时间为5秒
    //                conn.setConnectTimeout(5 * 1000);
    //                //通过输入流获取图片数据
    //                InputStream inStream = conn.getInputStream();
                    //得到图片的二进制数据，以二进制封装得到数据，具有通用性
                    BASE64Decoder decoder =new BASE64Decoder();
    
                    byte[] data = decoder.decodeBuffer(pictureUrl);
    //                byte[] data = readInputStream(inStream);
                    //anchor主要用于设置图片的属性
                    HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 1023, 255, (short) 1, rowIndex, (short) 1,
                            rowIndex);
                    //Sets the anchor type （图片在单元格的位置）
                    //0 = Move and size with Cells, 2 = Move but don't size with cells, 3 = Don't move or size with cells.
                    anchor.setAnchorType(0);
                    patriarch.createPicture(anchor, wb.addPicture(data, HSSFWorkbook.PICTURE_TYPE_JPEG));
                }
            }
            catch (IOException e)
            {
                e.printStackTrace();
            }
            catch (Exception e)
            {
                e.printStackTrace();
            }
        }
    
        private static byte[] readInputStream(InputStream inStream) throws Exception
        {
            ByteArrayOutputStream outStream = new ByteArrayOutputStream();
            //创建一个Buffer字符串
            byte[] buffer = new byte[1024];
            //每次读取的字符串长度，如果为-1，代表全部读取完毕
            int len = 0;
            //使用一个输入流从buffer里把数据读取出来
            while ((len = inStream.read(buffer)) != -1)
            {
                //用输出流往buffer里写入数据，中间参数代表从哪个位置开始读，len代表读取的长度
                outStream.write(buffer, 0, len);
            }
            //关闭输入流
            inStream.close();
            //把outStream里的数据写入内存
            return outStream.toByteArray();
        }
    
        public HSSFCellStyle getStyle(HSSFWorkbook workbook)
        {
            // 设置字体
            HSSFFont font = workbook.createFont();
            //设置字体大小
            font.setFontHeightInPoints((short) 9);
            //字体加粗
            //font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
            //设置字体名字
            font.setFontName("Courier New");
            //设置样式;
            HSSFCellStyle style = workbook.createCellStyle();
            //设置底边框;
            style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
            //设置底边框颜色;
            style.setBottomBorderColor(HSSFColor.BLACK.index);
            //设置左边框;
            style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
            //设置左边框颜色;
            style.setLeftBorderColor(HSSFColor.BLACK.index);
            //设置右边框;
            style.setBorderRight(HSSFCellStyle.BORDER_THIN);
            //设置右边框颜色;
            style.setRightBorderColor(HSSFColor.BLACK.index);
            //设置顶边框;
            style.setBorderTop(HSSFCellStyle.BORDER_THIN);
            //设置顶边框颜色;
            style.setTopBorderColor(HSSFColor.BLACK.index);
            //在样式用应用设置的字体;
            style.setFont(font);
            //设置自动换行;
            style.setWrapText(false);
            //设置水平对齐的样式为居中对齐;
            style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
            //设置垂直对齐的样式为居中对齐;
            style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
    
            return style;
        }
    
        public HSSFCellStyle getColumnTopStyle(HSSFWorkbook workbook)
        {
    
            // 设置字体
            HSSFFont font = workbook.createFont();
            //设置字体大小
            font.setFontHeightInPoints((short) 10);
            //字体加粗
            font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
            //设置字体名字
            font.setFontName("Courier New");
            //设置样式;
            HSSFCellStyle style = workbook.createCellStyle();
            //设置底边框;
            style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
            //设置底边框颜色;
            style.setBottomBorderColor(HSSFColor.BLACK.index);
            //设置左边框;
            style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
            //设置左边框颜色;
            style.setLeftBorderColor(HSSFColor.BLACK.index);
            //设置右边框;
            style.setBorderRight(HSSFCellStyle.BORDER_THIN);
            //设置右边框颜色;
            style.setRightBorderColor(HSSFColor.BLACK.index);
            //设置顶边框;
            style.setBorderTop(HSSFCellStyle.BORDER_THIN);
            //设置顶边框颜色;
            style.setTopBorderColor(HSSFColor.BLACK.index);
            //在样式用应用设置的字体;
            style.setFont(font);
            //设置自动换行;
            style.setWrapText(false);
            //设置水平对齐的样式为居中对齐;
            style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
            //设置垂直对齐的样式为居中对齐;
            style.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
    
            return style;
    
        }
    
    }

效果：

![2019110416581976.png][]

[2019110416581976.png]: https://img-blog.csdnimg.cn/2019110416581976.png