/*** 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();}}

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
  }
}

 //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;});