spring mvc 文件上传并携带其他参数

╰+哭是因爲堅強的太久メ 2023-10-16 23:22 1阅读 0赞

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>	
     
    	<context-param>
    		<param-name>contextConfigLocation</param-name>
    		<param-value>classpath:spring-mybatis.xml</param-value>
    	</context-param>
    	
    	<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>
    	
    	<listener>
    		<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    	</listener>
    	
    	<listener>
    		<listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>
    	</listener>
    
    	
    	<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>
    		
    		<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">
    	
    	<mvc:annotation-driven />  
        <mvc:default-servlet-handler/>  
        <context:annotation-config/>  
    	<context:component-scan base-package="com" />
    	
    	<bean id="mappingJacksonHttpMessageConverter"
    		class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter">
    		<property name="supportedMediaTypes">
    			<list>
    				<value>text/html;charset=UTF-8</value>
    			</list>
    		</property>
    	</bean>
    	
    	<bean
    		class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
    		<property name="messageConverters">
    			<list>
    				<ref bean="mappingJacksonHttpMessageConverter" />	
    			</list>
    		</property>
    	</bean>
    	
    	<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
    		
    		<property name="prefix" value="/backstage/jsp/" />
    		<property name="suffix" value=".jsp" />
    	</bean>
    	
    	
    	<bean id="multipartResolver"  
            class="org.springframework.web.multipart.commons.CommonsMultipartResolver">  
            
            <property name="defaultEncoding" value="utf-8" />  
            
            <property name="maxUploadSize" value="10485760000" />  
            
            <property name="maxInMemorySize" value="40960" />  
        </bean> 
        
         
     	<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）.