poi下載excel模板

/**
     * 下載模板
     * @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 {
            //獲取模板存放的路徑
            String path=request.getSession().getServletContext().getRealPath("/")+"/WEB-INF/ExcelTemplate/";
            InputStream is=new FileInputStream(new File(path + tplName));
            HSSFWorkbook wb=new HSSFWorkbook(is);
            //下載
            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工具類文件

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 要下載的文件路徑
   * @param returnName 返回的文件名
   * @param response HttpServletResponse
   * @param delFlag 是否刪除文件
   */
  protected void download(String filePath, String returnName, HttpServletResponse response, boolean delFlag){
    this.prototypeDownload(new File(filePath), returnName, response, delFlag);
  }


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

  /**
   * @param file 要下載的文件
   * @param returnName 返回的文件名
   * @param response HttpServletResponse
   * @param delFlag 是否刪除文件
   */
  public void prototypeDownload(File file,String returnName,HttpServletResponse response,boolean delFlag){
    // 下載文件
    FileInputStream inputStream = null;
    ServletOutputStream outputStream = null;
    try {
      if(!file.exists()) {return;}
      response.reset();
      //設置響應類型    PDF文件為"application/pdf"，WORD文件為："application/msword"， EXCEL文件為："application/vnd.ms-excel"。
      response.setContentType("application/octet-stream;charset=utf-8");

      //設置響應的文件名稱,並轉換成中文編碼
      //returnName = URLEncoder.encode(returnName,"UTF-8");
      returnName = response.encodeURL(new String(returnName.getBytes(),"iso8859-1"));    //保存的文件名,必須和頁面編碼一致,否則亂碼

      //attachment作為附件下載；inline客戶端機器有安裝匹配程序，則直接打開；注意改變配置，清除緩存，否則可能不能看到效果
      response.addHeader("Content-Disposition",   "attachment;filename="+returnName);

      //將文件讀入響應流
      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();
      }
      //刪除原文件

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

  /**
   * by tony 2013-10-17
   * @param byteArrayOutputStream 將文件內容寫入ByteArrayOutputStream
   * @param response HttpServletResponse    寫入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,必須和頁面編碼一致,否則亂碼
    response.addHeader("Content-Disposition",   "attachment;filename=" + returnName);
    response.setContentLength(byteArrayOutputStream.size());

    ServletOutputStream outputstream = response.getOutputStream();    //取得輸出流
    byteArrayOutputStream.writeTo(outputstream);                    //寫到輸出流
    byteArrayOutputStream.close();                                    //關閉
    outputstream.flush();                                            //刷數據
  }
}

 

（4）jsp頁面的調用代碼

 //模板下載
      $("#downloadFlowOrderTpl").click(function(){
          var tplName = "測試資金流水單模板.xls";
          var returnName =  "資金流水單模板.xls";
          window.location.href = "${pageContext.request.contextPath}/uploadCtrl/downloadTpl?tplName="+tplName+"&returnName="+returnName;
      });