Strust2+POI导出exel表格且解决文件名中文乱码/不显示

1. 下载并导入项目【poi.3.17.jar】

2. strust.xml

   <action name="returnLate_*" class="com.stureturnlate.moudels.biz.action.return_late.ReturnLateAction" method="{1}">
               <result name="list">/page/moudels/biz/return_late/returnLateList.jsp</result>
               <result name="openAdd">/page/moudels/biz/return_late/returnLateAdd.jsp</result>
               <!--<result name="openEdit">/page/biz/student/studentUpdate.jsp</result>-->
               <result name="openDetails">/page/moudels/biz/return_late/returnLateDetails.jsp</result>
   
               <!-- 导出Excel -->
               <result name="download" type="stream">
                   <param name="contentType">application/vnd.ms-excel</param><!-- 注意这里的ContentType -->
                   <param name="contentDisposition">attachment;filename="${fileName}.xls"</param><!-- 下载文件的名字 -->
                   <param name="bufferSize"></param><!-- 下载文件的大小 =1M -->
                   <param name="inputName">excelFile</param><!-- 这里需要和Action里的变量名一致 -->
               </result>
           </action>

3. ReturnLateAction.class

       /**
        * 导出
        * @return
        */
       public String download() throws Exception  {
   
           List<ReturnLateEntity> returnLateEntityList = new ArrayList<>();
           fileName = fileName+ DateTool.dateFormat(new Date());
           fileName=new String(fileName.getBytes("gb2312"), "iso8859-1");//防止中文乱码或不显示
   //TODO 第一步：声明excel的文档对象
           HSSFWorkbook returnLateExcel;
           try {
               //查询的结果，插入Excel填充数据
               String[] ids = returnLateIds.split(",");
               returnLateEntityList = returnLateService.selectAllReturnLate(ids);
   
               //TODO 第二步：获取excel的文档对象
               returnLateExcel = CreateExcel.createReturnLateExcel(returnLateEntityList);
   
               ByteArrayOutputStream output = new ByteArrayOutputStream();//字节数组输出流
   
               //TODO 第三步：写入字节数组输出流
               returnLateExcel.write(output);
               byte[] ba = output.toByteArray();
   
               //TODO 第四步：为输入流对象赋值
               excelFile = new ByteArrayInputStream(ba);
   
               output.flush();
               output.close();//关闭
           } catch (SQLException e) {
               System.out.println("晚归记录文件内容写入或者创建失败失败！");
               e.printStackTrace();
           } catch (IOException e) {
               e.printStackTrace();
           }
   
           return "download";
       }

4. 文件导出类CreateExcel.class

   package com.stureturnlate.common;
   
   import com.stureturnlate.moudels.vo.*;
   import org.apache.poi.hssf.usermodel.*;
   import org.apache.poi.ss.usermodel.HorizontalAlignment;
   
   import java.sql.SQLException;
   import java.util.List;
   
   /**
    * @author soldier
    * @title: CreateExcel
    * @projectName stu_return_late
    * @description: 文件导出Excel
    * @date 19-6-10下午9:56
    */
   public class CreateExcel {
   
       public static HSSFWorkbook createReturnLateExcel(List<ReturnLateEntity> returnLateEntityList) throws SQLException {
           // 创建一个Excel文件
           HSSFWorkbook workbook = new HSSFWorkbook();//excel的文档对象
           // 创建一个工作表
           HSSFSheet sheet = workbook.createSheet("学生晚归记录");
           // 添加表头行
           HSSFRow hssfRow = sheet.createRow(0);
           // 设置单元格格式居中
           HSSFCellStyle cellStyle = workbook.createCellStyle();
           cellStyle.setAlignment(HorizontalAlignment.CENTER);
   
           int index = 0;
           // 添加表头内容
           HSSFCell headCell = hssfRow.createCell(index++);
           headCell.setCellValue("晚归编号");
           headCell.setCellStyle(cellStyle);
   
           headCell = hssfRow.createCell(index++);
           headCell.setCellValue("晚归学生");
           headCell.setCellStyle(cellStyle);
   
           headCell = hssfRow.createCell(index++);
           headCell.setCellValue("所属学院");
           headCell.setCellStyle(cellStyle);
   
           headCell = hssfRow.createCell(index++);
           headCell.setCellValue("学生所在宿舍");
           headCell.setCellStyle(cellStyle);
   
           headCell = hssfRow.createCell(index++);
           headCell.setCellValue("晚归时间");
           headCell.setCellStyle(cellStyle);
   
           headCell = hssfRow.createCell(index++);
           headCell.setCellValue("晚归原因");
           headCell.setCellStyle(cellStyle);
   
           headCell = hssfRow.createCell(index++);
           headCell.setCellValue("记录者工号");
           headCell.setCellStyle(cellStyle);
   
           headCell = hssfRow.createCell(index);
           headCell.setCellValue("记录者姓名");
           headCell.setCellStyle(cellStyle);
   
           // 添加数据内容
           for (int i = 0; i < returnLateEntityList.size(); i++) {
               hssfRow = sheet.createRow((int) i + 1);
               ReturnLateEntity returnLateEntity = returnLateEntityList.get(i);
   
               index = 0;
               // 创建单元格，并设置值
               HSSFCell cell = hssfRow.createCell(index++);
               cell.setCellValue(returnLateEntity.getReturnLateId());
               cell.setCellStyle(cellStyle);
   
               cell = hssfRow.createCell(index++);
               StudentEntity studentEntity = new StudentEntity();//获取学生名称
               cell.setCellValue(studentEntity.getStudentName());
               cell.setCellStyle(cellStyle);
   
               cell = hssfRow.createCell(index++);
               CollegeEntity collegeEntity = new CollegeEntity();//获取学院
               cell.setCellValue(collegeEntity.getCollegeName());
               cell.setCellStyle(cellStyle);
   
               cell = hssfRow.createCell(index++);
               HostelEntity hostelEntity = new HostelEntity();//获取宿舍名称
               cell.setCellValue(hostelEntity.getHostelName());
               cell.setCellStyle(cellStyle);
   
               cell = hssfRow.createCell(index++);
               cell.setCellValue(DateTool.dateTimeFormat(returnLateEntity.getReturnLateTime()));
               cell.setCellStyle(cellStyle);
   
               cell = hssfRow.createCell(index++);
               cell.setCellValue(returnLateEntity.getReturnLateCause());
               cell.setCellStyle(cellStyle);
   
               cell = hssfRow.createCell(index++);
               DormMasterEntity dormMasterEntity = new DormMasterEntity();
               cell.setCellValue(dormMasterEntity.getDormMasterId());
               cell.setCellStyle(cellStyle);
   
               cell = hssfRow.createCell(index);
               cell.setCellValue(dormMasterEntity.getDormMasterName());
               cell.setCellStyle(cellStyle);
           }
   
           try {
               return workbook;
   
           } catch (Exception e) {
               e.printStackTrace();
           }
           return null;
       }
   }