spring mvc(注解)上傳文件的簡單例子，springmvc

spring mvc(注解)上傳文件的簡單例子，springmvc

spring mvc(注解)上傳文件的簡單例子,這有幾個需要注意的地方
1.form的enctype=”multipart/form-data” 這個是上傳文件必須的
2.applicationContext.xml中 <bean id=”multipartResolver” class=”org.springframework.web.multipart.commons.CommonsMultipartResolver”/> 關於文件上傳的配置不能少

大家可以看具體代碼如下:

web.xml

1. <?xml version="1.0" encoding="UTF-8"?>  
2. <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">  
3.   <display-name>webtest</display-name>  
4.   
5.   <listener>  
6.         <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>  
7.     </listener>  
8.     <context-param>  
9.         <param-name>contextConfigLocation</param-name>  
10.         <param-value>  
11.             /WEB-INF/config/applicationContext.xml  
12.             /WEB-INF/config/codeifAction.xml  
13.         </param-value>  
14.     </context-param>  
15.   
16.     <servlet>  
17.         <servlet-name>dispatcherServlet</servlet-name>  
18.         <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  
19.         <init-param>  
20.             <param-name>contextConfigLocation</param-name>  
21.             <param-value>/WEB-INF/config/codeifAction.xml</param-value>  
22.         </init-param>  
23.         <load-on-startup>1</load-on-startup>  
24.     </servlet>  
25.     <!-- 攔截所有以do結尾的請求 -->  
26.     <servlet-mapping>  
27.         <servlet-name>dispatcherServlet</servlet-name>  
28.         <url-pattern>*.do</url-pattern>  
29.     </servlet-mapping>  
30.   
31.   <welcome-file-list>  
32.     <welcome-file>index.do</welcome-file>  
33.   </welcome-file-list>  
34. </web-app>  

applicationContext.xml

1. <?xml version="1.0" encoding="UTF-8"?>  
2. <beans xmlns="http://www.springframework.org/schema/beans"  
3.     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"  
4.     xmlns:context="http://www.springframework.org/schema/context"  
5.     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd  
6.     http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"  
7.     default-lazy-init="true">  
8.   
9.     <!-- 啟動Spring MVC的注解功能，完成請求和注解POJO的映射 -->  
10.     <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" lazy-init="false" />  
11.   
12.     <!-- 另外最好還要加入DefaultAnnotationHandlerMapping，不然會被 XML或其它的映射覆蓋！ -->  
13.     <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />  
14.   
15.     <!-- 對模型視圖名稱的解析，即在模型視圖名稱添加前後綴 -->  
16.     <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" p:prefix="/WEB-INF/jsp/" p:suffix=".jsp" />  
17.   
18.     <!-- 支持上傳文件 -->  
19.     <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>  
20.   
21. </beans>  

codeifAction.xml

1. <?xml version="1.0" encoding="UTF-8"?>  
2. <beans xmlns="http://www.springframework.org/schema/beans"  
3.     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"  
4.     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd  
5.     http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd"  
6.     default-lazy-init="true">  
7.   
8.     <bean id="uploadAction" class="com.codeif.action.UploadAction" />  
9.   
10. </beans>  

UploadAction.java

1. package com.codeif.action;  
2.   
3. import java.io.File;  
4. import java.util.Date;  
5.   
6. import javax.servlet.http.HttpServletRequest;  
7.   
8. import org.springframework.stereotype.Controller;  
9. import org.springframework.ui.ModelMap;  
10. import org.springframework.web.bind.annotation.RequestMapping;  
11. import org.springframework.web.bind.annotation.RequestParam;  
12. import org.springframework.web.multipart.MultipartFile;  
13.   
14. @Controller  
15. public class UploadAction {  
16.   
17.     @RequestMapping(value = "/upload.do")  
18.     public String upload(@RequestParam(value = "file", required = false) MultipartFile file, HttpServletRequest request, ModelMap model) {  
19.   
20.         System.out.println("開始");  
21.         String path = request.getSession().getServletContext().getRealPath("upload");  
22.         String fileName = file.getOriginalFilename();  
23. //        String fileName = new Date().getTime()+".jpg";  
24.         System.out.println(path);  
25.         File targetFile = new File(path, fileName);  
26.         if(!targetFile.exists()){  
27.             targetFile.mkdirs();  
28.         }  
29.   
30.         //保存  
31.         try {  
32.             file.transferTo(targetFile);  
33.         } catch (Exception e) {  
34.             e.printStackTrace();  
35.         }  
36.         model.addAttribute("fileUrl", request.getContextPath()+"/upload/"+fileName);  
37.   
38.         return "result";  
39.     }  
40.   
41. }  

index.jsp

1. <%@ page pageEncoding="utf-8"%>  
2. <!DOCTYPE html>  
3. <html>  
4. <head>  
5. <meta charset="utf-8">  
6. <title>上傳圖片</title>  
7. </head>  
8. <body>  
9. <form action="upload.do" method="post" enctype="multipart/form-data">  
10. <input type="file" name="file" /> <input type="submit" value="Submit" /></form>  
11. </body>  
12. </html>  

WEB-INF/jsp/下的result.jsp

1. <%@ page pageEncoding="utf-8"%>  
2. <!DOCTYPE html>  
3. <html>  
4. <head>  
5. <meta charset="utf-8">  
6. <title>上傳結果</title>  
7. </head>  
8. <body>  
9. <img alt="" src="${fileUrl }" />  
10. </body>  
11. </html>