springMVC 上传文件

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spring mvc(注解)上传文件的简单例子,这有几个需要注意的地方
1.form的enctype=”multipart/form-data” 这个是上传文件必须的
2.applicationContext.xml中 <bean id=”multipartResolver” class=”org.springframework.web.multipart.commons.CommonsMultipartResolver”/> 关于文件上传的配置不能少

大家可以看具体代码如下:

web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">

  <display-name>webtest</display-name>

  <listener>

        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>

    </listener>

    <context-param>

        <param-name>contextConfigLocation</param-name>

        <param-value>

            /WEB-INF/config/applicationContext.xml

            /WEB-INF/config/codeifAction.xml

        </param-value>

    </context-param>

    <servlet>

        <servlet-name>dispatcherServlet</servlet-name>

        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>

        <init-param>

            <param-name>contextConfigLocation</param-name>

            <param-value>/WEB-INF/config/codeifAction.xml</param-value>

        </init-param>

        <load-on-startup>1</load-on-startup>

    </servlet>

    <!-- 拦截所有以do结尾的请求 -->

    <servlet-mapping>

        <servlet-name>dispatcherServlet</servlet-name>

        <url-pattern>*.do</url-pattern>

    </servlet-mapping>

  <welcome-file-list>

    <welcome-file>index.do</welcome-file>

  </welcome-file-list>

</web-app>

applicationContext.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:p="http://www.springframework.org/schema/p"

    xmlns:context="http://www.springframework.org/schema/context"

    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"

    default-lazy-init="true">

    <!-- 启动Spring MVC的注解功能，完成请求和注解POJO的映射 -->

    <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" lazy-init="false" />

    <!-- 另外最好还要加入DefaultAnnotationHandlerMapping，不然会被 XML或其它的映射覆盖！ -->

    <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />

    <!-- 对模型视图名称的解析，即在模型视图名称添加前后缀 -->

    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" p:prefix="/WEB-INF/jsp/" p:suffix=".jsp" />

    <!-- 支持上传文件 -->

    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>

</beans>

codeifAction.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"

    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"

    default-lazy-init="true">

    <bean id="uploadAction" class="com.codeif.action.UploadAction" />

</beans>

UploadAction.java:

package com.codeif.action;  

import java.io.File;

import java.util.Date;  

import javax.servlet.http.HttpServletRequest;  

import org.springframework.stereotype.Controller;

import org.springframework.ui.ModelMap;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RequestParam;

import org.springframework.web.multipart.MultipartFile;  

@Controller

public class UploadAction {  

    @RequestMapping(value = "/upload.do")

    public String upload(@RequestParam(value = "file", required = false) MultipartFile file, HttpServletRequest request, ModelMap model) {  

        System.out.println("开始");

        String path = request.getSession().getServletContext().getRealPath("upload");

        String fileName = file.getOriginalFilename();

//        String fileName = new Date().getTime()+".jpg";

        System.out.println(path);

        File targetFile = new File(path, fileName);

        if(!targetFile.exists()){

            targetFile.mkdirs();

        }  

        //保存

        try {

            file.transferTo(targetFile);

        } catch (Exception e) {

            e.printStackTrace();

        }

        model.addAttribute("fileUrl", request.getContextPath()+"/upload/"+fileName);  

        return "result";

    }  

}

WEB-INF/jsp/下的result.jsp:

<%@ page pageEncoding="utf-8"%>

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title>上传结果</title>

</head>

<body>

<img alt="" src="${fileUrl }" />

</body>

</html>

index.jsp:

<%@ page pageEncoding="utf-8"%>

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<title>上传图片</title>

</head>

<body>

<form action="upload.do" method="post" enctype="multipart/form-data">

<input type="file" name="file" /> <input type="submit" value="Submit" /></form>

</body>

</html>