springmvc学习笔记（九）文件上传

方式一：

１.spring配置文件

<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"><!-- 默认编码 --><property name="defaultEncoding" value="UTF-8"></property><!-- 上传文件大小限制 --><property name="maxUploadSize" value="3000000"></property><!-- 缓存大小 --><property name="maxInMemorySize" value="40960"></property></bean>

２.上传页面jsp

<form action="${pageContext.request.contextPath}/file/upload" method="post" enctype="multipart/form-data">选择文件：<input type="file" name="file"><br><input type="submit" value="上传"></form>

３.Controller类

package com.skymr.mvc.controller.annotation;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestParam;import org.springframework.web.multipart.commons.CommonsMultipartFile;@Controller@RequestMapping("file")public class UploadController {@RequestMapping("/upload")public String upload(@RequestParam("file")CommonsMultipartFile file){String fileName = file.getOriginalFilename();System.out.println("收到上传文件" + fileName);if(file.isEmpty()){System.out.println("上传失败");}try {InputStream is = file.getInputStream();FileOutputStream fos = new FileOutputStream("E:/"+fileName);int b;while((b=is.read()) != -1){fos.write(b);}fos.flush();fos.close();is.close();} catch (IOException e) {}return "uploadSuc";}@RequestMapping("/uploadView")public String uploadView(){return "uploadView";}}

部署测试后能上传成功，但上传较大文件时抛出异常，却不知道在哪捕获．

方式二：使用springmvc扩展的HttpServletReqeust，MultipartHttpServletRequest

@RequestMapping("/upload2")public String upload2(HttpServletRequest request, HttpServletResponse response){//解析器CommonsMultipartResolver resolver = new CommonsMultipartResolver(request.getSession().getServletContext());if(resolver.isMultipart(request)){MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest)request;Iterator<String> iter = multiRequest.getFileNames();while(iter.hasNext()){String name = iter.next();MultipartFile file = multiRequest.getFile(name);try {System.out.println("收到上传文件" + file.getOriginalFilename());file.transferTo(new File("E:/"+file.getOriginalFilename()));} catch (IllegalStateException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();}}}return "uploadSuc";}