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

 

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;@Controllerpublic 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>