spring mvc实现文件上传并携带其他参数的示例

这是主要使用到的jar 文件是：spring mvc +apache common-fileuplad

第一步：web.xml 文件。【重点是spring mvc的拦截器和相关监听器】

<?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>
 <!-- Spring和mybatis的配置文件 -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:spring-mybatis.xml</param-value>
  </context-param>
  <!-- 编码过滤器 -->
  <filter>
    <filter-name>encodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
      <param-name>encoding</param-name>
      <param-value>UTF-8</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>encodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  <!-- Spring监听器 -->
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <!-- 防止Spring内存溢出监听器 -->
  <listener>
    <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
  </listener> 

  <!-- Spring MVC servlet -->
  <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:spring-mvc.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>SpringMVC</servlet-name>
    <!-- 此处可以可以配置成*.do，对应struts的后缀习惯 -->
    <url-pattern>/</url-pattern>
  </servlet-mapping>
  <welcome-file-list>
    <welcome-file>/index.jsp</welcome-file>
  </welcome-file-list>
</web-app> 

第二步：spring-mvc 配置文件【重点：spring mvc 视图模式，spring mvc 文件上传限定参数，spring mvc 资源拦截管理和其他】

<?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"
  xmlns:mvc="http://www.springframework.org/schema/mvc"
  xsi:schemaLocation="http://www.springframework.org/schema/beans
            http://www.springframework.org/schema/beans/spring-beans-3.1.xsd
            http://www.springframework.org/schema/context
            http://www.springframework.org/schema/context/spring-context-3.1.xsd
            http://www.springframework.org/schema/mvc
            http://www.springframework.org/schema/mvc/spring-mvc-4.0.xsd">
  <!-- 自动扫描该包，使SpringMVC认为包下用了@controller注解的类是控制器 -->
  <mvc:annotation-driven />
  <mvc:default-servlet-handler/>
  <context:annotation-config/>
  <context:component-scan base-package="com" />
  <!--避免IE执行AJAX时，返回JSON出现下载文件 -->
  <bean id="mappingJacksonHttpMessageConverter"
    class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
    <property name="supportedMediaTypes">
      <list>
        <value>text/html;charset=UTF-8</value>
      </list>
    </property>
  </bean>
  <!-- 启动SpringMVC的注解功能，完成请求和注解POJO的映射 -->
  <bean
    class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
    <property name="messageConverters">
      <list>
        <ref bean="mappingJacksonHttpMessageConverter" /> <!-- JSON转换器 -->
      </list>
    </property>
  </bean>
  <!-- 定义跳转的文件的前后缀 ，视图模式配置-->
  <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    <!-- 这里的配置我的理解是自动给后面action的方法return的字符串加上前缀和后缀，变成一个 可用的url地址 -->
    <property name="prefix" value="/backstage/jsp/" />
    <property name="suffix" value=".jsp" />
  </bean> 

  <!-- 配置文件上传，如果没有使用文件上传可以不用配置，当然如果不配，那么配置文件中也不必引入上传组件包 -->
  <bean id="multipartResolver"
    class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
    <!-- 默认编码 -->
    <property name="defaultEncoding" value="utf-8" />
    <!-- 文件大小最大值 -->
    <property name="maxUploadSize" value="10485760000" />
    <!-- 内存中的最大值 -->
    <property name="maxInMemorySize" value="40960" />
  </bean>  

  <!-- 声明DispatcherServlet不要拦截下面声明的目录  -->
  <mvc:resources location="/js/" mapping="/js/**" />
  <mvc:resources location="/images/" mapping="/images/**"/>
  <mvc:resources location="/css/" mapping="/css/**"/>
  <mvc:resources location="/common/" mapping="/common/**"/> 

</beans>

第三步：jsp 页面

<%@ page language="java" pageEncoding="UTF-8"%>
<form action="<%=request.getContextPath()%>/users/add" method="POST" enctype="multipart/form-data">
  username: <input type="text" name="username"/><br/>
  nickname: <input type="text" name="nickname"/><br/>
  password: <input type="password" name="password"/><br/>
  yourmail: <input type="text" name="email"/><br/>
  yourfile: <input type="file" name="myfiles"/><br/>
  <input type="submit" value="添加新用户"/>
</form> 

第四步：spring mvc 控制器代码

package com.wlsq.controller; 

import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map; 

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse; 

import org.apache.commons.io.FileUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
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;
import org.springframework.web.servlet.ModelAndView; 

import com.wlsq.model.News;
import com.wlsq.service.IUserMapperService;
import com.wlsq.util.Pagination; 

@Controller
@RequestMapping(value="/users")
public class UserController {
  @Autowired
  private IUserMapperService userService; 

  @RequestMapping(value="/userAll")
  public ModelAndView searchNews(HttpServletRequest request,HttpServletResponse response){
    ModelAndView mv = null;
    try{
      mv = new ModelAndView();
      int pageSize = Integer
          .parseInt(request.getParameter("pageSize") == null ? "10"
              : request.getParameter("pageSize"));
      int pageNum = Integer
          .parseInt(request.getParameter("pageNum") == null ? "1"
              : request.getParameter("pageNum"));
      Map<String, Object> maps = new HashMap<>();
      maps.put("pageSize", pageSize);
      maps.put("pageNum", (pageNum-1) * pageSize);
      List<News> list =userService.selectAllUsers(maps);
      int count = userService.selectCountUsers();
      Pagination page = new Pagination(count);
      page.setCurrentPage(pageNum);
      mv.addObject("pnums", page.getPageNumList());
      mv.addObject("currentPage", pageNum);
      mv.addObject("pnext_flag", page.nextEnable());
      mv.addObject("plast_flag", page.lastEnable());
      page.lastPage();
      mv.addObject("last_page", page.getCurrentPage());
      mv.addObject("count", count);
      mv.addObject("pageCount", page.getPages());
      if(list !=null && list.size()>0){
        //用户存在
        mv.addObject("partners", list);
        //设置逻辑视图名，视图解析器会根据该名字解析到具体的视图页面
        mv.setViewName("/users/users");
      }else{
        //用户存在
        mv.addObject("partners", list);
        //设置逻辑视图名，视图解析器会根据该名字解析到具体的视图页面
        mv.setViewName("/users/users");
      } 

    }catch(Exception e){ 

      //设置逻辑视图名，视图解析器会根据该名字解析到具体的视图页面
      mv.setViewName("/users/users");
    } 

    return mv;
  } 

  @RequestMapping(value="/add", method=RequestMethod.POST)
  public String addUser(@RequestParam MultipartFile[] myfiles, HttpServletRequest request) throws IOException{
    String username = request.getParameter("username");
    String nickname = request.getParameter("nickname");
    String password = request.getParameter("password");
    String email = request.getParameter("email"); 

    System.out.println("name:"+username);
    System.out.println("nickname:"+nickname);
    System.out.println("password:"+password);
    System.out.println("email:"+email);
    //如果只是上传一个文件，则只需要MultipartFile类型接收文件即可，而且无需显式指定@RequestParam注解
    //如果想上传多个文件，那么 这里就要用MultipartFile[]类型来接收文件，并且还要指定@RequestParam注解
    //并且上传多个文件时，前台表单中的所有<input type="file"/>的name都应该是myfiles，否则参数里的myfiles无法获取到所有上传的文件
    for(MultipartFile myfile : myfiles){
      if(myfile.isEmpty()){
        System.out.println("文件未上传");
      }else{
        System.out.println("文件长度: " + myfile.getSize());
        System.out.println("文件类型: " + myfile.getContentType());
        System.out.println("文件名称: " + myfile.getName());
        System.out.println("文件原名: " + myfile.getOriginalFilename());
        System.out.println("========================================");
        //如果用的是Tomcat服务器，则文件会上传到\\%TOMCAT_HOME%\\webapps\\YourWebProject\\WEB-INF\\upload\\文件夹中
        String realPath = request.getSession().getServletContext().getRealPath("/WEB-INF/upload");
        //这里不必处理IO流关闭的问题，因为FileUtils.copyInputStreamToFile()方法内部会自动把用到的IO流关掉，我是看它的源码才知道的
        FileUtils.copyInputStreamToFile(myfile.getInputStream(), new File(realPath, myfile.getOriginalFilename()));
      }
    } 

    return "../../index";
  } 

}

记得在WEB-INFO建立存放上传文件目录（upload）

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