springMVC---文件上传

直接上干货吧。先看看目录结构，没有用的我都涂了：

然后是springMVC的配置。

web.xml

 1 <?xml version="1.0" encoding="UTF-8"?>
 2 <web-app version="2.5" 
 3     xmlns="http://java.sun.com/xml/ns/javaee" 
 4     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
 5     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
 6     http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
 7   <display-name></display-name>    
 8   
 9   <servlet>
10     <servlet-name>springmvc</servlet-name>
11     <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
12     <init-param>
13       <param-name>contextConfigLocation</param-name>
14       <param-value>classpath:springmvc.xml</param-value>
15     </init-param>
16     <load-on-startup>1</load-on-startup>
17   </servlet>
18   
19   <!-- 访问路径配置 -->
20   <servlet-mapping>
21     <servlet-name>springmvc</servlet-name>
22     <url-pattern>*.do</url-pattern>
23   </servlet-mapping>
24   
25   <welcome-file-list>
26     <welcome-file>index.jsp</welcome-file>
27   </welcome-file-list>
28 </web-app>

springmvc配置

 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" 
 4     xmlns:p="http://www.springframework.org/schema/p"
 5     xmlns:context="http://www.springframework.org/schema/context"
 6     xsi:schemaLocation="
 7         http://www.springframework.org/schema/beans
 8         http://www.springframework.org/schema/beans/spring-beans.xsd
 9         http://www.springframework.org/schema/context
10         http://www.springframework.org/schema/context/spring-context.xsd">
11        
12         <!-- 配置视图渲染器 -->
13     <bean id="jspViewResolver"
14         class="org.springframework.web.servlet.view.InternalResourceViewResolver">
15         <property name="viewClass"
16             value="org.springframework.web.servlet.view.JstlView" />
17         <!-- 将视图名 渲染后视图的前缀 -->
18         <property name="prefix" value="/WEB-INF/jsp/" />
19         <!-- 渲染后视图的后缀 -->
20         <property name="suffix" value=".jsp" />
21     </bean>
22     
23     <!-- 根据传进来的URL自动扫描com.SafeCode.controller下的命名空间 -->
24     <context:component-scan base-package="cn.springmvc.controller"/>
25     
26     <!-- 文件上传 -->  
27     <bean id="multipartResolver"  
28         class="org.springframework.web.multipart.commons.CommonsMultipartResolver">  
29         <!-- 设置上传文件的最大尺寸为5MB -->  
30         <property name="maxUploadSize">  
31             <value>5242880</value>  
32         </property>  
33     </bean> 
34 </beans>

完成文件的上传功能，最重要的是在springmvc.xml中配置的这个multipartResolver，需要导入相关jar包，还要在controller中用到MultipartFile声明对象。

controller：

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

这样就能完成springmvc文件上传功能了。