spring mvc 文件上传并携带其他参数分析

访客 阅读:159 2021-03-31 22:10:45 评论:0

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,[email protected] --> 
	<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,[email protected] 
		//如果想上传多个文件,那么 这里就要用MultipartFile[]类型来接收文件,[email protected] 
		//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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