基于SpringMVC的多文件上传

以你之姓@ 2022-06-01 11:53 155阅读 0赞

文件上传很常见,本次写一个基于SpringMVC的文件上传

先在springmvc.xml配置如下

<?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:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xmlns:mvc="http://www.springframework.org/schema/mvc" 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 http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
    
    
        
        <mvc:annotation-driven></mvc:annotation-driven>
        
        <context:component-scan base-package="lhc"></context:component-scan>
        
        <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
            <property name="prefix" value="/WEB-INF/jsp/"></property>
            <property name="suffix" value=".jsp"></property>
        </bean>
    
        <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
        <property name="defaultEncoding" value="utf-8"/>
        <property name="maxUploadSize" value="1048576000"/>
        <property name="maxInMemorySize" value="4096000"/>
        </bean>
    
    </beans>

web.xml配置

<?xml version="1.0" encoding="UTF-8"?>
    <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
      <display-name>fileupload</display-name>
      <welcome-file-list>
        <welcome-file>index.html</welcome-file>
        <welcome-file>index.htm</welcome-file>
        <welcome-file>index.jsp</welcome-file>
        <welcome-file>default.html</welcome-file>
        <welcome-file>default.htm</welcome-file>
        <welcome-file>default.jsp</welcome-file>
      </welcome-file-list>
    
      
        <servlet>
            <servlet-name>springDispatcherServlet</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>
    
        
        <servlet-mapping>
            <servlet-name>springDispatcherServlet</servlet-name>
            <url-pattern>/</url-pattern>
        </servlet-mapping>
    
        
            <filter> 
            <filter-name>Encoding</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> 
            <init-param> 
                <param-name>forceEncoding</param-name> 
                <param-value>true</param-value> 
            </init-param> 
        </filter> 
        <filter-mapping> 
            <filter-name>Encoding</filter-name> 
            <url-pattern>/*</url-pattern> 
        </filter-mapping> 
    </web-app>

写一个jsp页面,支持多文件上传

<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
    <html>
    <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
    <title>Insert title here</title>
    </head>
    <body>
    
    <form action="${pageContext.request.contextPath }/file/fileupload" enctype="multipart/form-data" method="post" >
    上传人<input type="text" name="username"/> <br/>
    
    上传文件<input type="file" name="fileupload" multiple="multiple" /> <br/>
    <input type="submit" value="submit"/>
    </form>
    </body>
    </html>

最后写Controller,注意tomcat重启文件会消失的问题

package lhc.controller;
    
    import java.io.File;
    import java.io.IOException;
    import java.util.List;
    import java.util.UUID;
    
    import javax.servlet.http.HttpServletRequest;
    
    import org.springframework.stereotype.Controller;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RequestParam;
    import org.springframework.web.multipart.MultipartFile;
    
    @Controller
    @RequestMapping("/file")
    public class fileUpload {
    
        @RequestMapping("/tofileupload")
        public String toFileUpload() {
    
            return "fileupload";
        }
    
        @RequestMapping("/fileupload")
        public String upload(@RequestParam("username") String username,
                @RequestParam("fileupload") List<MultipartFile> fileupload, HttpServletRequest request) {
            for (MultipartFile file : fileupload) {
    
                String originalFilename = file.getOriginalFilename();
                // 注意:tomcat会在重启后删掉上次上传的文件,并且文件目录放置有问题
                // String realPath = request.getServletContext().getRealPath("/文件夹下/");
                // 所以改用存到本地磁盘下
                String mypath = "D:/程序测试/文件夹下/";
                File filepath = new File(mypath);
                if (!filepath.exists()) {
                    filepath.mkdirs();
                }
    
                String newfilename = username + UUID.randomUUID() + originalFilename;
    
                try {
                    file.transferTo(new File(mypath + newfilename));
                } catch (IllegalStateException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
            return "success";
        }
    }
    ,