springmvc文件上传2中方法
基于前面文章的基础上。
一、准备
需要的jar
二、配置
1、 spmvc-servlet.xml
<?xml version="1.0" encoding="UTF-8" ?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:util="http://www.springframework.org/schema/util" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd"> <!-- 默认的注解映射的支持 ,它会自动注册DefaultAnnotationHandlerMapping 与AnnotationMethodHandlerAdapter--> <mvc:annotation-driven /> <!-- 自动扫描注解的Controller --> <context:component-scan base-package="com.wy.controller" /> <bean class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter" /> <!-- 映射处理器 --> <bean id="simpleUrlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"> <property name="mappings"> <props> <prop key="/fileUploadController.do">fileUploadController</prop> </props> </property> </bean> <!-- ParameterMethodNameResolver 解析请求参数,并将它匹配Controller中的方法名 --> <bean id="parameterMethodNameResolver" class="org.springframework.web.servlet.mvc.multiaction.ParameterMethodNameResolver"> <property name="paramName" value="action" /> </bean> <bean id="fileUploadController" class="com.wy.controller.FileUploadController"> <property name="methodNameResolver" ref="parameterMethodNameResolver"> </property> </bean> <!-- 文件上传表单的视图解析器 --> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> <!-- one of the properties available; the maximum file size in bytes --> <property name="maxUploadSize" value="204800" /> </bean> </beans>
2、Controller
使用两种方式:
一种是基于注解的,另一种传统的方式HttpServletRequest
使用第二种方式时要注意:操作方法中对应的方法参数前两位必须是request,response对象并且都要加上,否则会出现 No request handling method with name ‘insert‘ in class "ClassName",页面显示为404错误
这个问题出现在使用多操作控制器情况下,相关的操作方法中对应的方法参数前两位必须是request,response对象,必须要有,否则会报如上异常。
package com.wy.controller; import java.util.List; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import org.springframework.stereotype.Controller; import org.springframework.util.MultiValueMap; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.multipart.MultipartFile; import org.springframework.web.multipart.MultipartHttpServletRequest; import org.springframework.web.servlet.ModelAndView; import org.springframework.web.servlet.mvc.multiaction.MultiActionController; @Controller @RequestMapping("/fileUploadController") public class FileUploadController extends MultiActionController { /** * 1、文件上传 * @param request * @param response * @return */ public ModelAndView uploadFiles(HttpServletRequest request, HttpServletResponse response) { ModelAndView mav = new ModelAndView(); // 转型为MultipartHttpRequest MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request; // 获得上传的文件(根据前台的name名称得到上传的文件) MultiValueMap<String, MultipartFile> multiValueMap = multipartRequest.getMultiFileMap(); List<MultipartFile> file = multiValueMap.get("clientFile"); //MultipartFile file = multipartRequest.getFile("clientFile"); if(!file.isEmpty()){ //在这里就可以对file进行处理了,可以根据自己的需求把它存到数据库或者服务器的某个文件夹 System.out.println("================="+file.get(0).getName() + file.get(0).getSize()); } return mav; } /** * * @param name * @param file * @param session * @return */ @RequestMapping(value="/uploadFile", method=RequestMethod.POST) public String uploadFile(@RequestParam("fileName") String fileName, @RequestParam("clientFile") MultipartFile clientFile, HttpSession session){ if (!clientFile.isEmpty()) { //在这里就可以对file进行处理了,可以根据自己的需求把它存到数据库或者服务器的某个文件夹 System.out.println("================="+clientFile.getSize()); } return ""; } }
对文件的具体实现
import java.io.File; import java.io.IOException; import java.util.Iterator; import java.util.UUID; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.web.multipart.MultipartFile; import org.springframework.web.multipart.MultipartHttpServletRequest; import org.springframework.web.multipart.commons.CommonsMultipartResolver; public class AddImage { public String upload2(HttpServletRequest request,HttpServletResponse response, String fileName) throws IllegalStateException, IOException { //创建一个通用的多部分解析器 CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext()); //判断 request 是否有文件上传,即多部分请求 if(multipartResolver.isMultipart(request)){ //转换成多部分request MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest)request; //取得request中的所有文件名 Iterator<String> iter = multiRequest.getFileNames(); while(iter.hasNext()){ //记录上传过程起始时的时间,用来计算上传时间 int pre = (int) System.currentTimeMillis(); //取得上传文件 MultipartFile file = multiRequest.getFile(iter.next()); if(file != null){ //取得当前上传文件的文件名称 String myFileName = file.getOriginalFilename(); //如果名称不为“”,说明该文件存在,否则说明该文件不存在 if(myFileName.trim() !=""){ System.out.println(myFileName); //重命名上传后的文件名 fileName = UUID.randomUUID() +"+"+ file.getOriginalFilename(); //定义上传路径 String path = "F:/workspace/myproject/WebRoot/image/" + fileName; File localFile = new File(path); file.transferTo(localFile); } } //记录上传该文件后的时间 int finaltime = (int) System.currentTimeMillis(); System.out.println(finaltime - pre); } } return fileName ; } }
3、试图
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> <title>file upload test</title> </head> <body> <form method="post" action="<%=path %>/fileUploadController/uploadFile" enctype="multipart/form-data"> 文件名: <input type="text" name="fileName" /><br/> <input type="file" name="clientFile" /><br/> <input type="submit" value="上传文件 "/> </form> </body> </html>
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