springMVC文件上传优化

1. 新建web project

2. 填 jar，注意新加入两个上传文件的jar， commons-io， commons-fileupload

3. 改写web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
	xmlns="http://java.sun.com/xml/ns/javaee"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
	http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
  <display-name></display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>

  <servlet>
  	<servlet-name>springMVC</servlet-name>
  	<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  	<init-param>
  		<param-name>contextConfigLocation</param-name>
  		<param-value>classpath*:config/spring-servlet.xml</param-value>
  	</init-param>
  	<load-on-startup>1</load-on-startup>
  </servlet>

  <filter>
        <filter-name>characterEncodingFilter</filter-name>
        <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>UTF-8</param-value>
        </init-param>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>characterEncodingFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

  <servlet-mapping>
  	<servlet-name>springMVC</servlet-name>
  	<url-pattern>/</url-pattern>
  </servlet-mapping>

</web-app>

4. 新增config包， 新建spring-servlet.xml

新增了上传文件需要的bean

<?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:p="http://www.springframework.org/schema/p"
    xmlns:context="http://www.springframework.org/schema/context"
    xmlns:mvc="http://www.springframework.org/schema/mvc"
    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">
    <!-- 注解扫描包 -->
    <context:component-scan base-package="com.tgb.web.controller" />      

    <!-- 开启注解 -->
    <mvc:annotation-driven/>

    <!-- 静态资源访问 -->
    <mvc:resources location="/img/" mapping="/img/**"/>
    <mvc:resources location="/js/" mapping="/js/**"/>
    <mvc:resources location="/css/" mapping="/css/**"/>

    <!-- ViewResolver 视图解析器 -->
    <bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"/>
        <property name="suffix" value=".jsp"/>
    </bean>
    <!-- 上传文件 -->
     <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
          <property name="defaultEncoding"  value="UTF-8"/>
          <property name="maxUploadSize"    value="1048576000"/>
          <property name="maxInMemorySize"  value="40960"/>
    </bean> 

</beans>

5. 写controller方法， uploadController.java

package com.tgb.web.controller;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Date;
import java.util.Iterator;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.multipart.commons.CommonsMultipartFile;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;

@Controller
@RequestMapping("/file")
public class UploadController {
	@RequestMapping("/upload")
	public String upload(@RequestParam("file") CommonsMultipartFile file,HttpServletRequest request) throws IOException{
		System.out.println("filename--->"+file.getOriginalFilename());
		if(!file.isEmpty()){
			try {
				FileOutputStream os = new FileOutputStream("D:/"+new Date().getTime()+file.getOriginalFilename());
				InputStream in =  file.getInputStream();
				int b = 0;
				while((b=in.read())!=-1){
					os.write(b);
				}
				os.flush();
				os.close();
				in.close();
			} catch (FileNotFoundException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
		return "/success";
	}

	@RequestMapping("/upload2")
	public String upload2(HttpServletRequest request, HttpServletResponse response) throws IllegalStateException, IOException{
		CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());
		if(multipartResolver.isMultipart(request)){
			MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest)request;
			Iterator<String> iter = multiRequest.getFileNames();
			if(iter.hasNext()){
				MultipartFile file = multiRequest.getFile((String)iter.next());
				if(file!=null){
					 	String fileName="demoUpload"+file.getOriginalFilename();
					    String path = "D:/" + fileName;
					    File localFile = new File(path);
					    file.transferTo(localFile);
				}
			}
		}
		return "/success";
	}

	@RequestMapping("/toUpload")
	public String toUpload(){
		return "/upload";
	}
}

6. 写jsp文件， upload.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  <script type="text/javascript" src="../js/jquery-1.4.2.min.js"></script>
    <title>My JSP ‘upload.jsp‘ starting page</title>
  </head>
  <body>
	  <h> 添加用户 </h> <br>
	  <form name="fileForm" action="/springMVCUpload/file/upload2" method="post" enctype="multipart/form-data">
	  	选择文件: <input type="file" name="file">
	  	<input type="submit" value="上传">
	  </form>

  </body>
</html>

还有succuss.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
  <script type="text/javascript" src="../js/jquery-1.4.2.min.js"></script>
    <title></title>
  </head>
  <body>
	  上传文件成功
  </body>
</html>

7. 地址栏验证

http://localhost:8080/springMVCUpload/file/toUpload