poi下载excel模板

/**
     * 下载模板
     * @param tplName
     * @param returnName
     * @param response
     * @param request
     * @throws Exception
     */
    @RequestMapping(value = "/downloadTpl")
    public void downloadTpl(String tplName,String returnName, HttpServletResponse response,
                              HttpServletRequest request) throws Exception {
        try {
            //获取模板存放的路径
            String path=request.getSession().getServletContext().getRealPath("/")+"/WEB-INF/ExcelTemplate/";
            InputStream is=new FileInputStream(new File(path + tplName));
            HSSFWorkbook wb=new HSSFWorkbook(is);
            //下载
            DownloadUtil dUtil=new DownloadUtil();
            ByteArrayOutputStream os=new ByteArrayOutputStream();
            wb.write(os);
            dUtil.download(os, response, returnName);
            os.flush();
            os.close();
        } catch (Exception e) {
            e.printStackTrace();
            throw new Exception();
        }

    }

（1）其中，需要配置的pom.xml文件

（2）excel文件

（3）downloadutil工具类文件

package com.test.util;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;

public class DownloadUtil {

  /**
   * @param filePath 要下载的文件路径
   * @param returnName 返回的文件名
   * @param response HttpServletResponse
   * @param delFlag 是否删除文件
   */
  protected void download(String filePath, String returnName, HttpServletResponse response, boolean delFlag){
    this.prototypeDownload(new File(filePath), returnName, response, delFlag);
  }


  /**
   * @param file 要下载的文件
   * @param returnName 返回的文件名
   * @param response HttpServletResponse
   * @param delFlag 是否删除文件
   */
  protected void download(File file,String returnName,HttpServletResponse response,boolean delFlag){
    this.prototypeDownload(file, returnName, response, delFlag);
  }

  /**
   * @param file 要下载的文件
   * @param returnName 返回的文件名
   * @param response HttpServletResponse
   * @param delFlag 是否删除文件
   */
  public void prototypeDownload(File file,String returnName,HttpServletResponse response,boolean delFlag){
    // 下载文件
    FileInputStream inputStream = null;
    ServletOutputStream outputStream = null;
    try {
      if(!file.exists()) {return;}
      response.reset();
      //设置响应类型    PDF文件为"application/pdf"，WORD文件为："application/msword"， EXCEL文件为："application/vnd.ms-excel"。
      response.setContentType("application/octet-stream;charset=utf-8");

      //设置响应的文件名称,并转换成中文编码
      //returnName = URLEncoder.encode(returnName,"UTF-8");
      returnName = response.encodeURL(new String(returnName.getBytes(),"iso8859-1"));    //保存的文件名,必须和页面编码一致,否则乱码

      //attachment作为附件下载；inline客户端机器有安装匹配程序，则直接打开；注意改变配置，清除缓存，否则可能不能看到效果
      response.addHeader("Content-Disposition",   "attachment;filename="+returnName);

      //将文件读入响应流
      inputStream = new FileInputStream(file);
      outputStream = response.getOutputStream();
      int length = 1024;
      int readLength=0;
      byte buf[] = new byte[1024];
      readLength = inputStream.read(buf, 0, length);
      while (readLength != -1) {
        outputStream.write(buf, 0, readLength);
        readLength = inputStream.read(buf, 0, length);
      }
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      try {
        outputStream.flush();
      } catch (IOException e) {
        e.printStackTrace();
      }
      try {
        outputStream.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
      try {
        inputStream.close();
      } catch (IOException e) {
        e.printStackTrace();
      }
      //删除原文件

      if(delFlag) {
        file.delete();
      }
    }
  }

  /**
   * by tony 2013-10-17
   * @param byteArrayOutputStream 将文件内容写入ByteArrayOutputStream
   * @param response HttpServletResponse    写入response
   * @param returnName 返回的文件名
   */
  public void download(ByteArrayOutputStream byteArrayOutputStream, HttpServletResponse response, String returnName) throws IOException {
    response.setContentType("application/octet-stream;charset=utf-8");
    returnName = response.encodeURL(new String(returnName.getBytes(),"iso8859-1"));            //保存的文件名,必须和页面编码一致,否则乱码
    response.addHeader("Content-Disposition",   "attachment;filename=" + returnName);
    response.setContentLength(byteArrayOutputStream.size());

    ServletOutputStream outputstream = response.getOutputStream();    //取得输出流
    byteArrayOutputStream.writeTo(outputstream);                    //写到输出流
    byteArrayOutputStream.close();                                    //关闭
    outputstream.flush();                                            //刷数据
  }
}

（4）jsp页面的调用代码

 //模板下载
      $("#downloadFlowOrderTpl").click(function(){
          var tplName = "测试资金流水单模板.xls";
          var returnName =  "资金流水单模板.xls";
          window.location.href = "${pageContext.request.contextPath}/uploadCtrl/downloadTpl?tplName="+tplName+"&returnName="+returnName;
      });