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 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>webtestdisplay-name>

   <listener>
         <listener-class>org.springframework.web.context.ContextLoaderListenerlistener-class>
     listener>
     <context-param>
         <param-name>contextConfigLocationparam-name>
         <param-value>
             /WEB-INF/config/applicationContext.xml
             /WEB-INF/config/codeifAction.xml
         param-value>
     context-param>

     <servlet>
         <servlet-name>dispatcherServletservlet-name>
         <servlet-class>org.springframework.web.servlet.DispatcherServletservlet-class>
         <init-param>
             <param-name>contextConfigLocationparam-name>
             <param-value>/WEB-INF/config/codeifAction.xmlparam-value>
         init-param>
         <load-on-startup>1load-on-startup>
     servlet>

     <servlet-mapping>
         <servlet-name>dispatcherServletservlet-name>
         <url-pattern>*.dourl-pattern>
     servlet-mapping>

   <welcome-file-list>
     <welcome-file>index.dowelcome-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">


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


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


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


     <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"%>
 >
 <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"%>
 >
 <html>
 <head>
 <meta charset="utf-8">
 <title>上传结果title>
 head>
 <body>
 <img alt="" src="${fileUrl }" />
 body>
 html>