SpringMVC 中MultipartFile檔案上傳 -單檔案Form送出

單檔案使用spring mvc的MultipartFile MultipartHttpServletRequest上傳，用 transferTo方法來儲存圖檔。實作效果：

//方式一，使用MultipartFile作為方法參數接收傳入的檔案

//方式二，利用MultipartHttpServletRequest來解析request中的檔案

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-04</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加了這個commons-io-2.2依賴包自動加上了,是以我們就加這一個-->
	<dependency>
	    <groupId>commons-fileupload</groupId>
	    <artifactId>commons-fileupload</artifactId>
	    <version>1.3.2</version>
	</dependency>
	
  </dependencies>
  <build>
    <finalName>upload-04</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 定義進行中文亂碼 -->
    <!-- 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-04</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,如果請求是以.htm結尾就走springmvc查找相應處理器 -->
	<servlet>
		<servlet-name>springmvc</servlet-name>
		<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
		<!-- 加載springmvc配置檔案 -->
		<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 ">
		<!-- 自動掃描包下面的檔案，類上帶有@Controller的會注冊為bean -->
		<context:component-scan base-package="com.taray.controller"></context:component-scan>
		<!-- 代替處理器映射器、處理器擴充卡 ,mvc注解驅動-->
		<mvc:annotation-driven/>
		<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
			<property name="prefix" value="/"/>
			<property name="suffix" value=".jsp"/>
		</bean>
		<!-- Spring MVC上傳檔案時,我們都需要配置一個MultipartResolver的實作, 常用的是Apache提供的CommonsMultipartResolver類 -->
		<!-- Spring MVC的核心類DispatcherServlet中, 把這些bean的id固定了. 你必須保證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%>" target="_blank" rel="external nofollow" >
<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" >
        上傳檔案：<input type="file" name="file"/>
		<input type="submit" value="送出1"/>
    </form>
	<form action="upload2.htm" enctype="multipart/form-data" method="post" >
        上傳檔案：<input type="file" name="file"/>
		<input type="submit" value="送出2"/>
    </form>
</body>
</html>

5.Upload01Controller.java

package com.taray.controller;

import java.io.File;
import java.io.IOException;
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作為方法參數接收傳入的檔案
	@RequestMapping("upload1")
	public String upload01(@RequestParam("file") MultipartFile file,HttpServletRequest request){
		//判斷檔案是否為空
		if(!file.isEmpty()){
			//獲得原始檔案名
			String fileName=file.getOriginalFilename();
			//重命名檔案
			String newFileName=UUID.randomUUID()+fileName;
			//request.getSession().getServletContext().getRealPath("/")表示目前項目根路徑
			String pic_path=request.getSession().getServletContext().getRealPath("/upload");
			//判斷存儲圖檔的實體路徑檔案夾是否存在，如果檔案夾不存在就建立
			File fileForPath=new File(pic_path);
			if(!fileForPath.exists()){
				System.out.println("file not exists");
				fileForPath.mkdir();
			}
			System.out.println("檔案路徑，可用于回顯："+pic_path+"\\"+newFileName);
			//新檔案路徑執行個體
			File targetFile=new File(pic_path,newFileName);
			//記憶體資料讀入磁盤
			try {
				file.transferTo(targetFile);
			} catch (IllegalStateException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return null;
	}
	
	//方式二，利用MultipartHttpServletRequest來解析request中的檔案
	/**普通request是無法解析請求中的檔案的。
	 * MultipartHttpServletRequest是springmvc架構中的一個接口，預設實作類是DefaultMultipartHttpServletRequest
	 */
	@RequestMapping("upload2")
	public String upload02(HttpServletRequest request,HttpServletResponse response){
		//執行個體化一個檔案解析器
		CommonsMultipartResolver commonsMultipartResolver = new CommonsMultipartResolver(request.getSession().getServletContext());
		//判斷request請求是否有檔案上傳
		if(commonsMultipartResolver.isMultipart(request)){
			//轉換request
			MultipartHttpServletRequest multiRequest=(MultipartHttpServletRequest)request;
			//獲得檔案
			MultipartFile file=multiRequest.getFile("file");
			if(!file.isEmpty()){
				//獲得原始檔案名
				String fileName=file.getOriginalFilename();
				String newFileName=UUID.randomUUID()+fileName;
				//獲得實體路徑，webapp所在路徑
				String pic_path=request.getSession().getServletContext().getRealPath("/upload2");
				//判斷存儲圖檔的實體路徑檔案夾是否存在，如果檔案夾不存在就建立
				File fileForPath=new File(pic_path);
				if(!fileForPath.exists()){
					System.out.println("file not exists");
					fileForPath.mkdir();
				}
				System.out.println("檔案路徑，可用于回顯："+pic_path+"\\"+newFileName);
				//新檔案路徑執行個體
				File targetFile=new File(pic_path,newFileName);
				try {
					file.transferTo(targetFile);
				} catch (IllegalStateException e) {
					e.printStackTrace();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}
		return null;
	}
	
}

學習文章：

https://www.cnblogs.com/yskcoder/p/4718198.html

https://blog.csdn.net/chenchunlin526/article/details/70945877/

SpringMVC 中MultipartFile檔案上傳 -單檔案Form送出

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