spring mvc(注解)上传文件的简单例子

spring mvc(注解)上传文件的简单例子

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

3、亲这两个jar包不能少哦，之前就是因为少了这个两个jar，一直报一些奇葩的错，给我累了个半死~（版本没什么要求）

commons-fileupload-1.2.2.jar

commons-io-2.0.1.jar

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";

}

}

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>

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>