springMvc上传下载

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配置spring-mvc.xml配置文件

上传下载只需要配置一个bean

    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">    <property name="defaultEncoding" value="UTF-8"/>

   <!-- 指定所上传文件的总大小不能超过200KB。注意maxUploadSize属性的限制不是针对单个文件，而是所有文件的容量之和 -->        <property name="maxUploadSize" value="20000000"/>      </bean>

然后是上传页面

upload.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">        <title>My JSP 'upload.jsp' starting page</title>    <meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">-->  </head>    <body><form action="upload.html" method="post" enctype="multipart/form-data">  <input type="file" name="file" /> <input type="submit" value="Submit" /></form>    </body></html>

上传的conntroller

UploadController.java

packagenet.spring.controller; import java.io.File;import java.io.IOException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;importorg.springframework.stereotype.Controller;import org.springframework.ui.ModelMap;importorg.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.multipart.MultipartFile; @Controllerpublicclass  UploadController {@RequestMapping("/upload")public String upload(@RequestParam(value = "file", required = false) MultipartFile file,HttpServletRequest request,HttpServletResponse response, ModelMap model) throws IOException{          System.out.println("开始");          String path =request.getSession().getServletContext().getRealPath("upload");                String fileName =file.getOriginalFilename();//        String type=fileName.substring(fileName.lastIndexOf("."),fileName.length());//        System.out.println(fileName);//        String fileNames = new Date().getTime()+type;          System.out.println(path);          File targetFile = new File(path, fileName);          if(!targetFile.exists()){              targetFile.mkdirs();          }            //保存          try {              file.transferTo(targetFile);          } catch (Exception e) {              e.printStackTrace();          }  //     model.addAttribute("fileUrl", request.getContextPath()+"/upload/"+fileName);       model.addAttribute("fileUrl", "/upload/"+fileName);            return "result";      }  }

然后是返回的页面result.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">        <title>My JSP 'result.jsp' starting page</title>    <meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">-->  </head>    <body>文件列表  <ul>  <li>${fileUrl}<a href="download.html?fileName=${fileUrl}">下载</a></li>  </ul>      </body></html>

接着就是下载的方法

DownloadController.java

packagenet.spring.controller; import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.File;import java.io.FileInputStream;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.servlet.ModelAndView; @Controllerpublicclass  DownloadController {@RequestMapping("/download")public ModelAndView download(String fileName, HttpServletRequest request, HttpServletResponse response)throws Exception{    response.setContentType("text/html;charset=utf-8");           request.setCharacterEncoding("UTF-8");           java.io.BufferedInputStream bis = null;           java.io.BufferedOutputStream bos = null;           String ctxPath = request.getSession().getServletContext().getRealPath(                   "/")                   + "\\";           String downLoadPath = ctxPath + fileName;           System.out.println(downLoadPath);           try {               long fileLength = new File(downLoadPath).length();               response.setContentType("application/x-msdownload;");             String type=fileName.substring(fileName.lastIndexOf("/")+1,fileName.length());          System.out.println(type);          fileName = type;             response.setHeader("Content-disposition", "attachment; filename="                      + new String(fileName.getBytes("utf-8"), "ISO8859-1"));               response.setHeader("Content-Length", String.valueOf(fileLength));               bis = new BufferedInputStream(new FileInputStream(downLoadPath));               bos = new BufferedOutputStream(response.getOutputStream());               byte[] buff = new byte[2048];               int bytesRead;               while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {                   bos.write(buff, 0, bytesRead);               }           } catch (Exception e) {               e.printStackTrace();           } finally {               if (bis != null)                   bis.close();               if (bos != null)                   bos.close();           }           return null;  }}

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