SpringMVC 菜鸟教程 3 文件上传 CommonsMultipartResolver

CommonsMultipartResolverUploadController

package com.jege.spring.mvc;import java.io.File;import java.util.Iterator;import javax.servlet.http.HttpServletRequest;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.multipart.MultipartFile;import org.springframework.web.multipart.MultipartHttpServletRequest;import org.springframework.web.multipart.commons.CommonsMultipartResolver;@Controllerpublic class CommonsMultipartResolverUploadController{  // http://localhost:8080/upload  @RequestMapping(value = "/upload", method = RequestMethod.GET)  public String uploadGet() {    System.out.println("先以get的请求方式显示上传页面");    return "upload";  }  int i = 0;// 简单改变上传文件的名字  @RequestMapping(value = "/upload", method = RequestMethod.POST)  public String uploadPost(HttpServletRequest request) throws Exception {    System.out.println("在以post请求方式处理上传的请求");    // 记录开始上传文件的时间    long startTime = System.currentTimeMillis();    String webapp = request.getServletContext().getRealPath("/upload");    System.out.println("上传文件保存到服务器webapp的路径:" + webapp);    // 存放文件的路径    File deskFile = new File(webapp, "eclipse.zip");    System.out.println("上传文件存放的最终路径：" + deskFile.getAbsolutePath());    // 将当前上下文初始化给 CommonsMutipartResolver:配置上传文件解析器    CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());    // 检查form中是否有enctype="multipart/form-data"，即是是否有文件上传    if (multipartResolver.isMultipart(request)) {      // 将request变成多部件MultipartHttpServletRequest      MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;      // 获取multiRequest 中所有的文件名      Iterator<String> iter = multiRequest.getFileNames();      // 遍历所有文件      while (iter.hasNext()) {      MultipartFile file = multiRequest.getFile(iter.next());    if (file != null) {// 处理上传      file.transferTo(deskFile);    }      }    }    // 添加提示信息    request.setAttribute("msg", "上传成功");    // 记录结束上传文件的时间    long endTime = System.currentTimeMillis();    System.out.println("上传究竟用了多少时间：" + String.valueOf(endTime - startTime) + "ms");    // 直接转发到upload.jsp    return "upload";  }}

上传300MB文件耗时比较

• 使用CommonsMultipartResolver来保存上传的文件
  先以get的请求方式显示上传页面
  在以post请求方式处理上传的请求
  上传究竟用了多少时间：261ms
  第二次上传究竟用了多少时间：223ms
  第三次上传究竟用了多少时间：276ms

其他关联项目

• SpringMVC 菜鸟教程 文件上传-配置
  http://blog.csdn.net/je_ge/article/details/53725357
• SpringMVC-文件上传-MultipartFile
  http://blog.csdn.net/je_ge/article/details/53726147

源码地址

https://github.com/je-ge/spring

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