Spring MVC实现的带参数的form表单多文件上传

（由于字数限制请看项目里代码，下面省略部分不重要的代码）

首先是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">  
  <servlet>  
        <servlet-name>upload</servlet-name>  
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>  
        <load-on-startup>1</load-on-startup>  
    </servlet>  
    <servlet-mapping>  
        <servlet-name>upload</servlet-name>  
        <url-pattern>/</url-pattern>  
    </servlet-mapping>  
 
    <filter>  
        <filter-name>SpringCharacterEncodingFilter</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>SpringCharacterEncodingFilter</filter-name>  
        <url-pattern>/*</url-pattern>  
    </filter-mapping>  
      
    <welcome-file-list>  
        <welcome-file>/WEB-INF/jsp/user/add.jsp</welcome-file>  
    </welcome-file-list>  
</web-app>

接下来是SpringMVC的配置文件upload-servlet.xml

  <?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:mvc="http://www.springframework.org/schema/mvc"  
        xmlns:context="http://www.springframework.org/schema/context"  
        xsi:schemaLocation="http://www.springframework.org/schema/beans   
                            http://www.springframework.org/schema/beans/spring-beans-3.0.xsd  
                            http://www.springframework.org/schema/mvc  
                            http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd  
                            http://www.springframework.org/schema/context   
                            http://www.springframework.org/schema/context/spring-context-3.0.xsd">  
        <context:component-scan base-package="com.jadyer"/>  
          
        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">  
            <property name="prefix" value="/WEB-INF/jsp/"/>  
            <property name="suffix" value=".jsp"/>  
        </bean>  
          
        <!-- SpringMVC上传文件时，需要配置MultipartResolver处理器 -->  
        <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">  
            <property name="defaultEncoding" value="UTF-8"/>  
            <!-- 指定所上传文件的总大小不能超过200KB。注意maxUploadSize属性的限制不是针对单个文件，而是所有文件的容量之和 -->  
            <property name="maxUploadSize" value="200000"/>  
        </bean>  
          
        <!-- SpringMVC在超出上传文件限制时，会抛出org.springframework.web.multipart.MaxUploadSizeExceededException -->  
        <!-- 该异常是SpringMVC在检查上传的文件信息时抛出来的，而且此时还没有进入到Controller方法中 -->  
        <bean id="exceptionResolver" class="org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">  
            <property name="exceptionMappings">  
                <props>  
                    <!-- 遇到MaxUploadSizeExceededException异常时，自动跳转到/WEB-INF/jsp/error_fileupload.jsp页面 -->  
                    <prop key="org.springframework.web.multipart.MaxUploadSizeExceededException">error_fileupload</prop>  
                </props>  
            </property>  
        </bean>  
    </beans> 

下面是用于上传的表单页面//WEB-INF//jsp//user//add.jsp

（由于字数限制请看项目里代码）

下面是上传成功后打印用户信息的页面//WEB-INF//jsp//user//list.jsp

（由于字数限制请看项目里代码）

下面是上传文件内容过大时的提示页面//WEB-INF//jsp//error_fileupload.jsp

（由于字数限制请看项目里代码）

接下来是用到的实体类User.java

public class User {
	private String username;
	private String nickname;
	private String password;
	private String email;

	//{此处get.set省略}
	public User() {
	}

	public User(String username, String nickname, String password, String email) {
		this.username = username;
		this.nickname = nickname;
		this.password = password;
		this.email = email;
	}
}

最后是核心的UserController.java

@Controller
@RequestMapping("/user")
public class UserController {
	private final static Map<String, User> users = new HashMap<String, User>();

	// 模拟数据源,构造初始数据
	public UserController() {
		users.put("张起灵", new User("张起灵", "闷油瓶", "02200059",
				"menyouping@yeah.net"));
		users.put("李寻欢", new User("李寻欢", "李探花", "08866659",
				"lixunhuan@gulong.cn"));
		users.put("拓拔野", new User("拓拔野", "搜神记", "05577759",
				"tuobaye@manhuang.cc"));
		users.put("孙悟空", new User("孙悟空", "美猴王", "03311159",
				"sunhouzi@xiyouji.zh"));
	}

	@RequestMapping("/list")
	public String list(Model model) {
		model.addAttribute("users", users);
		return "user/list";
	}

	@RequestMapping(value = "/add", method = RequestMethod.GET)
	public String addUser() {
		return "user/add";
	}

	@RequestMapping(value = "/add", method = RequestMethod.POST)
	public String addUser(User user, @RequestParam MultipartFile[] myfiles,
			HttpServletRequest request) throws IOException {
		// 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
			// 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
			// String realPath =
			// request.getSession().getServletContext().getRealPath("/FileTest/WebContent/WEB-INF/upload");
			String realPath = request.getSession().getServletContext()
					.getRealPath("/WEB-INF/upload");
			System.out.println(realPath);

			FileUtils.copyInputStreamToFile(myfile.getInputStream(), new File(
					realPath, myfile.getOriginalFilename()));
			// }
		}
		users.put(user.getUsername(), user);
		return "redirect:/user/list";
	}
}

补充：记得建立这个目录，用于存放上传的文件，即//WEB-INF//upload//

下面是程序运行截图：

添加成功后：