首先强调，需要下载的文件只能放在项目中的webapp下

 

1、页面的一个超链接，链接到controller

点击下载文件

2、controller中的代码：

@RequestMapping("/download")    @ResponseBody        public void downLoadExcelModel(HttpServletRequest request,HttpServletResponse response) throws Exception {         String download = request.getSession().getServletContext().getRealPath("/upload/"); //获取下载路劲         ExcelAndCsvDownload.downLoadFile(moban.csv,csv,download, response);//依次传入需要下载的文件名，文件格式，路径，response参数       }

3、工具类：

package com.common.util;import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import javax.servlet.http.HttpServletResponse;public class ExcelAndCsvDownload{        public static boolean downLoadFile(String name,String type,String path,HttpServletResponse response)            throws Exception {            String fileName = name;            String fileType = type;            File file = new File(path+fileName);  //根据文件路径获得File文件            //设置文件类型(这样设置就不止是下Excel文件了，一举多得)            if("pdf".equals(fileType)){               response.setContentType("application/pdf;charset=GBK");            }else if("csv".equals(fileType)){               response.setContentType("application/msexcel;charset=GBK");            }else if("doc".equals(fileType)){               response.setContentType("application/msword;charset=GBK");            }else if("xls".equals(fileType)){                   response.setContentType("application/msexcel;charset=GBK");                }            //文件名            response.setHeader("Content-Disposition", "attachment;filename=\""                + new String(fileName.getBytes(), "ISO8859-1") + "\"");            response.setContentLength((int) file.length());            byte[] buffer = new byte[4096];// 缓冲区            BufferedOutputStream output = null;            BufferedInputStream input = null;            try {              output = new BufferedOutputStream(response.getOutputStream());              input = new BufferedInputStream(new FileInputStream(file));              int n = -1;              //遍历，开始下载              while ((n = input.read(buffer, 0, 4096)) > -1) {                 output.write(buffer, 0, n);              }              output.flush();   //不可少              response.flushBuffer();//不可少            } catch (Exception e) {              //异常自己捕捉                   } finally {               //关闭流，不可少               if (input != null)                    input.close();               if (output != null)                    output.close();            }           return false;        }}