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

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <display-name></display-name>    
  
  <servlet>
    <servlet-name>springmvc</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:springmvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  
  <!-- 访问路径配置 -->
  <servlet-mapping>
    <servlet-name>springmvc</servlet-name>
    <url-pattern>*.do</url-pattern>
  </servlet-mapping>
  
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>

springmvc配置

<?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.xsd
        http://www.springframework.org/schema/context
        http://www.springframework.org/schema/context/spring-context.xsd">
       
        <!-- 配置视图渲染器 -->
    <bean id="jspViewResolver"
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="viewClass"
            value="org.springframework.web.servlet.view.JstlView" />
        <!-- 将视图名 渲染后视图的前缀 -->
        <property name="prefix" value="/WEB-INF/jsp/" />
        <!-- 渲染后视图的后缀 -->
        <property name="suffix" value=".jsp" />
    </bean>
    
    <!-- 根据传进来的URL自动扫描com.SafeCode.controller下的命名空间 -->
    <context:component-scan base-package="cn.springmvc.controller"/>
    
    <!-- 文件上传 -->  
    <bean id="multipartResolver"  
        class="org.springframework.web.multipart.commons.CommonsMultipartResolver">  
        <!-- 设置上传文件的最大尺寸为5MB -->  
        <property name="maxUploadSize">  
            <value>5242880</value>  
        </property>  
    </bean> 
</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：

package cn.springmvc.controller;

import java.io.File;

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.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;

@Controller
public class imageController {
    
    @RequestMapping(value="/addImage", method=RequestMethod.POST)
    public String addImage(@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();    
        System.out.println(path + "\" + fileName);  
        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";
    }

}

这样就能完成springmvc文件上传功能了。