springMVC文件上传优化

2021-12-10 06:50:57

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

码农公寓

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