SpringMVC 中MultipartFile文件上传 -多文件Form提交

其他 2019-10-27 17:50:17 阅读次数: 0
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本文链接： https://blog.csdn.net/zhouhaisunny/article/details/83418765

和SpringMVC 中MultipartFile文件上传 -单文件Form提交区别就是两三行代码不同，不过一篇文章不能零零散散，所以我还是把代码全贴出来，效果图：

1.pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.citywy</groupId>
  <artifactId>upload-05</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>

<properties>
  	<spring.version>3.2.4.RELEASE</spring.version>  
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>
  <dependencies>
    <!-- springmvc start -->
    <dependency>  
        <groupId>org.springframework</groupId>  
        <artifactId>spring-aop</artifactId>  
        <version>${spring.version}</version>  
    </dependency>  
    <dependency>  
        <groupId>org.springframework</groupId>  
        <artifactId>spring-aspects</artifactId>  
        <version>${spring.version}</version>  
    </dependency>  
    <dependency>  
        <groupId>org.springframework</groupId>  
        <artifactId>spring-beans</artifactId>  
        <version>${spring.version}</version>  
    </dependency>  
    <dependency>  
        <groupId>org.springframework</groupId>  
        <artifactId>spring-context</artifactId>  
        <version>${spring.version}</version>  
    </dependency>  
    <dependency>  
        <groupId>org.springframework</groupId>  
        <artifactId>spring-context-support</artifactId>  
        <version>${spring.version}</version>  
    </dependency>  
    <dependency>  
        <groupId>org.springframework</groupId>  
        <artifactId>spring-core</artifactId>  
        <version>${spring.version}</version>  
    </dependency>  
    <dependency>  
        <groupId>org.springframework</groupId>  
        <artifactId>spring-expression</artifactId>  
        <version>${spring.version}</version>  
    </dependency>  
    <dependency>  
        <groupId>org.springframework</groupId>  
        <artifactId>spring-jdbc</artifactId>  
        <version>${spring.version}</version>  
    </dependency>  
    <dependency>  
        <groupId>org.springframework</groupId>  
        <artifactId>spring-orm</artifactId>  
        <version>${spring.version}</version>  
    </dependency>  
    <dependency>  
        <groupId>org.springframework</groupId>  
        <artifactId>spring-test</artifactId>  
        <version>${spring.version}</version>  
    </dependency>  
    <dependency>  
        <groupId>org.springframework</groupId>  
        <artifactId>spring-tx</artifactId>  
        <version>${spring.version}</version>  
    </dependency>  
    <dependency>  
        <groupId>org.springframework</groupId>  
        <artifactId>spring-web</artifactId>  
        <version>${spring.version}</version>  
    </dependency>  
    <dependency>  
        <groupId>org.springframework</groupId>  
        <artifactId>spring-webmvc</artifactId>  
        <version>${spring.version}</version>  
    </dependency>  
    <!-- springmvc end -->
    <!-- https://mvnrepository.com/artifact/javax.servlet/jstl -->
	<dependency>
	    <groupId>javax.servlet</groupId>
	    <artifactId>jstl</artifactId>
	    <version>1.2</version>
	</dependency>
	
	<!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
	<dependency>
	    <groupId>javax.servlet</groupId>
	    <artifactId>javax.servlet-api</artifactId>
	    <version>3.1.0</version>
	    <scope>provided</scope>
	</dependency>
	<!-- Apache commons-fileupload加了这个commons-io-2.2依赖包自动加上了,所以我们就加这一个-->
	<dependency>
	    <groupId>commons-fileupload</groupId>
	    <artifactId>commons-fileupload</artifactId>
	    <version>1.3.2</version>
	</dependency>
  </dependencies>
  <build>
    <finalName>upload-05</finalName>
  </build>
</project>

2.web.xml

<?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_3_0.xsd" id="WebApp_ID" version="3.0">
 	<!-- Filter 定义处理中文乱码 -->
    <!-- Character Encoding filter -->  
    <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>
        <init-param>
            <param-name>forceEncoding</param-name>
            <param-value>true</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>encodingFilter</filter-name>  
        <url-pattern>/*</url-pattern>  
    </filter-mapping>
	<display-name>upload-05</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>
	<!-- 配置前端控制器,如果请求是以.htm结尾就走springmvc查找相应处理器 -->
	<servlet>
		<servlet-name>springmvc</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<!-- 加载springmvc配置文件 -->
		<init-param>
			<param-name>contextConfigLocation</param-name>
	  		<param-value>classpath:springmvc.xml</param-value>
		</init-param>
	</servlet>
	<servlet-mapping>
	  	<servlet-name>springmvc</servlet-name>
	  	<url-pattern>*.htm</url-pattern>
	</servlet-mapping>
</web-app>

3.springmvc.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"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx"  
    xsi:schemaLocation="http://www.springframework.org/schema/beans
        http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/mvc
        http://www.springframework.org/schema/mvc/spring-mvc.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 ">
		<!-- 自动扫描包下面的文件，类上带有@Controller的会注册为bean -->
		<context:component-scan base-package="com.taray.controller"></context:component-scan>
		<!-- 代替处理器映射器、处理器适配器 ,mvc注解驱动-->
		<mvc:annotation-driven/>
		<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
			<property name="prefix" value="/"/>
			<property name="suffix" value=".jsp"/>
		</bean>
		<!-- Spring MVC上传文件时,我们都需要配置一个MultipartResolver的实现, 常用的是Apache提供的CommonsMultipartResolver类 -->
		<!-- Spring MVC的核心类DispatcherServlet中, 把这些bean的id固定了. 你必须保证bean的id相同, 才能正常工作.  -->  
	    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
	    	<property name="defaultEncoding" value="UTF-8"/>  
	    	<!--max size: 10M 1024*1024*10-->  
	    	<property name="maxUploadSize" value="10485760"/>
	    </bean>
</beans>

4.index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> 
<%
String path = request.getContextPath(); 
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; 
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> 
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP 'upload.jsp' starting page</title> 
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache"> 
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> 
<meta http-equiv="description" content="This is my page"> 
</head>
<body>
	<form action="upload1.htm" enctype="multipart/form-data" method="post" >
		上传文件1：<input type="file" name="file"/><br/>
		上传文件2：<input type="file" name="file"/><br/>
		上传文件3：<input type="file" name="file"/><br/>
		<input type="submit" value="提交1"/>
    </form>
	<form action="upload2.htm" enctype="multipart/form-data" method="post" >
		上传文件1：<input type="file" name="file"/><br/>
		上传文件2：<input type="file" name="file"/><br/>
		上传文件3：<input type="file" name="file"/><br/>
		<input type="submit" value="提交1"/>
    </form>
</body>
</html>

5.Upload01Controller.java

package com.taray.controller;

import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.UUID;

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

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;
import org.springframework.web.multipart.MultipartHttpServletRequest;
import org.springframework.web.multipart.commons.CommonsMultipartResolver;

@Controller
public class Upload01Controller {
	//方式一，使用MultipartFile作为方法参数接收传入的文件
	@RequestMapping("upload1")
	public String upload01(@RequestParam("file") MultipartFile [] files,HttpServletRequest request,HttpServletResponse response){
		//判断文件是否为空
		if(files!=null && files.length>0){
			//循环遍历取出单个文件，下面操作和单个文件操作一样
			for(MultipartFile file:files){
				//获得原始文件名
				String fileName=file.getOriginalFilename();
				//重命名文件
				String newFileName=UUID.randomUUID()+fileName;
				//request.getSession().getServletContext().getRealPath("/")表示当前项目根路径
				String pic_path=request.getSession().getServletContext().getRealPath("/upload");
				//判断存储图片的物理路径文件夹是否存在，如果文件夹不存在就创建
				File fileForPath=new File(pic_path);
				if(!fileForPath.exists()){
					System.out.println("file not exists");
					fileForPath.mkdir();
				}
				//新文件路径实例
				File targetFile=new File(pic_path,newFileName);
				System.out.println("文件保存绝对路径："+targetFile.getAbsolutePath());
				//内存数据读入磁盘
				try {
					file.transferTo(targetFile);
				} catch (IllegalStateException e) {
					e.printStackTrace();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		return null;
	}
	
	//方式二，利用MultipartHttpServletRequest来解析request中的文件
	/**普通request是无法解析请求中的文件的
	 * MultipartHttpServletRequest是springmvc框架中的一个接口，默认实现类是DefaultMultipartHttpServletRequest
	 */
	@RequestMapping("upload2")
	public String upload02(HttpServletRequest request,HttpServletResponse response){
		//实例化一个文件解析器
		CommonsMultipartResolver commonsMultipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());
		//判断request请求是否有文件上传
		if(commonsMultipartResolver.isMultipart(request)){
			//转换request
			MultipartHttpServletRequest multiRequest=(MultipartHttpServletRequest)request;
			//获得文件,和单文件不同在于方法是getFiles得到List集合
			List<MultipartFile> files=multiRequest.getFiles("file");
			for(MultipartFile file:files){	//下面操作就和单个文件一样了
				if(!file.isEmpty()){
					//获得原始文件名
					String fileName=file.getOriginalFilename();
					String newFileName=UUID.randomUUID()+fileName;
					//获得物理路径，webapp所在路径
					String pic_path=request.getSession().getServletContext().getRealPath("/upload2");
					//判断存储图片的物理路径文件夹是否存在，如果文件夹不存在就创建
					File fileForPath=new File(pic_path);
					if(!fileForPath.exists()){
						System.out.println("file not exists");
						fileForPath.mkdir();
					}
					System.out.println("文件路径，可用于回显："+pic_path+"\\"+newFileName);
					//新文件路径实例
					File targetFile=new File(pic_path,newFileName);
					try {
						file.transferTo(targetFile);
					} catch (IllegalStateException e) {
						e.printStackTrace();
					} catch (IOException e) {
						e.printStackTrace();
					}
				}
			}
		}
		return null;
	}
}

这儿所谓的多文件上传和前面的一次选择多个文件上传还不一样，他们有什么关联呢，底层是一样的嘛？详见：Springmvc下一次选多个文件上传(一)Form提交和Ajax异步。

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