springmvc 文件上传与下载

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1. 准备jar包： commons-fileupload-1.3.2.jar

commons-io-2.2.jar

spring-mvc.xml 添加

<!-- 配置文件上传，如果没有使用文件上传可以不用配置，当然如果不配，那么配置文件中也不必引入上传组件包 --><bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">        <!-- 默认编码 -->        <property name="defaultEncoding" value="utf-8"/>        <!-- 文件大小最大值 -->        <property name="maxUploadSize" value="10485760000"/>        <!-- 内存中的最大值 -->        <property name="maxInMemorySize" value="40960"/>        <!-- 上传文件的临时路径 -->        <property name="uploadTempDir" value="fileUpload/temp"/>      </bean>

3.controller.java

@RequestMapping("/upload")    public String upload(@RequestParam("file") MultipartFile file,HttpServletRequest request) throws Exception{// 判断文件是否为空          if (!file.isEmpty()) {              try {                  // 文件保存路径                  String filePath =  request.getSession().getServletContext().getRealPath("//")+"/upload/"                        + file.getOriginalFilename();                  // 转存文件                  file.transferTo(new File(filePath));                  System.out.println("**********"+filePath);            } catch (Exception e) {                  e.printStackTrace();              }          }                  return "success";    }

4.upload.jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"    pageEncoding="UTF-8"%><!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Insert title here</title><link rel="stylesheet" href="${pageContext.request.contextPath}/css/bootstrap.min.css"><link rel="stylesheet" href="${pageContext.request.contextPath}/css/bootstrap-theme.min.css"><script src="${pageContext.request.contextPath}/js/jquery-1.11.2.min.js"></script><script src="${pageContext.request.contextPath}/js/bootstrap.min.js"></script></head><body style="padding: 20px">  <form action="${pageContext.request.contextPath}/user/upload.do" method="post" enctype="multipart/form-data">      选择文件:<input type="file" name="file">      <input type="submit" value="提交">   </form>  </body></html>

下载：

controller.java

  @RequestMapping("download")        public ResponseEntity<byte[]> download(String path) throws IOException {            File file=new File(path);          HttpHeaders headers = new HttpHeaders();          String fileName=path.substring(path.lastIndexOf("/")+1);              fileName=new String(fileName.getBytes("UTF-8"),"iso-8859-1");//为了解决中文名称乱码问题          headers.setContentDispositionFormData("attachment", fileName);           headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);           return new ResponseEntity<byte[]>(FileUtils.readFileToByteArray(file),                                              headers, HttpStatus.CREATED);        }

download.jsp

<a class="tooltip-test" data-toggle="tooltip" title="下载文件" href="download.do?path=${wfDeployment.path }">

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