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[Java教程]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.

 

大家可以看具体代码如下:

 

web.

  1. <?version="1.0" encoding="UTF-8"?>  
  2. <web-app "http://www.w3.org/2001/"http://java.sun.com/"http://java.sun.com/xsi:schemaLocation="http://java.sun.com/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.
  12.             /WEB-INF/config/codeifAction.
  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.</param-value>  
  22.         </init-param>  
  23.         <load-on-startup>1</load-on-startup>  
  24.     </servlet>  
  25.     <!-- 拦截所有以do结尾的请求 -->  
  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.

  1. <?version="1.0" encoding="UTF-8"?>  
  2. <beans "http://www.springframework.org/schema/beans"  
  3.     "http://www.w3.org/2001/"http://www.springframework.org/schema/p"  
  4.     "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.     <!-- 启动Spring MVC的注解功能,完成请求和注解POJO的映射 -->  
  10.     <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" lazy-init="false" />  
  11.   
  12.     <!-- 另外最好还要加入DefaultAnnotationHandlerMapping,不然会被 
  13.     <bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />  
  14.   
  15.     <!-- 对模型视图名称的解析,即在模型视图名称添加前后缀 -->  
  16.     <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" p:prefix="/WEB-INF/jsp/" p:suffix=".jsp" />  
  17.   
  18.     <!-- 支持上传文件 -->  
  19.     <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>  
  20.   
  21. </beans>  


 

codeifAction.

  1. <?version="1.0" encoding="UTF-8"?>  
  2. <beans "http://www.springframework.org/schema/beans"  
  3.     "http://www.w3.org/2001/"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("开始");  
  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>上传图片</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>上传结果</title>  
    7. </head>  
    8. <body>  
    9. <img alt="" src="${fileUrl }" />  
    10. </body>  
    11. </html>