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>