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Java通过POI导出excel文件示例(包括文件名的修改及下载路径的选择)

注:本文案例中使用的POI版本是3.15

(每个版本的POI用法都不太一样,特别是4.0后的新版本,还对JDK的版本有要求,至少要JDK1.8才能兼容POI4.0后的版本)

 

前端JSP页面

//点击下载按钮触发以下事件
function on_downLoad(obj){
   window.location.href = URLStr + "downLoad?id="+obj.id
}

工具类

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;

public class ExcelUtil {

    /**
     * 导出Excel
     * @param sheetName sheet名称
     * @param title 标题
     * @param values 内容
     * @param wb HSSFWorkbook对象
     * @return
     */
    public static HSSFWorkbook getHSSFWorkbook(String sheetName,String []title,String [][]values, HSSFWorkbook wb){

        // 第一步,创建一个HSSFWorkbook,对应一个Excel文件
        if(wb == null){
            wb = new HSSFWorkbook();
        }

        // 第二步,在workbook中添加一个sheet,对应Excel文件中的sheet
        HSSFSheet sheet = wb.createSheet(sheetName);

        // 第三步,在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制
        HSSFRow row = sheet.createRow(0);

        // 第四步,创建单元格,并设置值表头 设置表头居中
        HSSFCellStyle style = wb.createCellStyle();
        style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 创建一个居中格式

        //声明列对象
        HSSFCell cell = null;

        //创建标题
        for(int i=0;i<title.length;i++){
            cell = row.createCell(i);
            cell.setCellValue(title[i]);
            cell.setCellStyle(style);
        }

        //创建内容
        for(int i=0;i<values.length;i++){
            row = sheet.createRow(i + 1);
            for(int j=0;j<values[i].length;j++){
                //将内容按顺序赋给对应的列对象
                row.createCell(j).setCellValue(values[i][j]);
            }
        }

        return wb;
    }
}

后台控制层


@RequestMapping(value="/downLoad")
public void downLoad(HttpServletRequest request, HttpServletResponse response, TotalTableVo totalTableVo){
   TotalTable totalTable = this.totalTableServiceImpl.getEntityById(TotalTable.class, totalTableVo.getId());

   TransferRegistrationVo transferRegistrationVo = new TransferRegistrationVo();
   transferRegistrationVo.setTtId(totalTableVo.getId());
   //获取数据
   List<TransferRegistration> trList = this.transferRegistrationServiceImpl.queryEntityList(transferRegistrationVo);

   //excel文件名
   String fileName = totalTable.getTitle();

   //sheet名
   String sheetName = "交接班";

   //excel标题
   String[] title = {"班次","天气","本班次值班人员","值班时间","上班次值班人员","交接时间","交接事项","接班异常情况"};

   SimpleDateFormat sdf = new SimpleDateFormat("HH:mm");

   String[][] content = new String[trList.size()][];
   for (int i = 0; i < trList.size(); i++) {
      content[i] = new String[title.length];
      //将对象内容转换成string
      TransferRegistration tr = trList.get(i);
      content[i][0] = tr.getShift();
      content[i][1] = tr.getWeather();
      content[i][2] = tr.getThisWatcher();
      content[i][3] = sdf.format(tr.getWatchTimeStart()) + "至" + sdf.format(tr.getWatchTimeEnd());
      content[i][4] = tr.getLaseWatcher();
      content[i][5] = sdf.format(tr.getHandoverTime());
      content[i][6] = tr.getHandoverMatters();
      content[i][7] = tr.getException();
   }

   //创建HSSFWorkbook
   HSSFWorkbook wb = ExcelUtil.getHSSFWorkbook(sheetName, title, content, null);

   //将文件存到指定位置
   try {
      this.setResponseHeader(response, fileName);
      OutputStream os = response.getOutputStream();
      wb.write(os);
      os.flush();
      os.close();
   } catch (Exception e) {
      e.printStackTrace();
   }
}


//发送响应流方法
public void setResponseHeader(HttpServletResponse response, String fileName) {
   try {
      try {
         fileName = new String(fileName.getBytes(),"ISO8859-1");
      } catch (UnsupportedEncodingException e) {
         // TODO Auto-generated catch block
         e.printStackTrace();
      }
      response.setContentType("application/octet-stream;charset=ISO8859-1");
      response.setHeader("Content-Disposition", "attachment;filename="+ fileName +".xls");   //要保存的文件名
      response.addHeader("Pargam", "no-cache");
      response.addHeader("Cache-Control", "no-cache");
   } catch (Exception ex) {
      ex.printStackTrace();
   }
}

实际效果如下:

注意:要想下载的时候可以自定义下载路径或文件名,要修改浏览器的设置,如下:

(这里以谷歌为例)

 

参考博文:https://www.cnblogs.com/gudongcheng/p/8268909.html

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