1.建立web專案fileDemo

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">
    <display-name>fileDemo</display-name>
    <!-- 統一編碼 -->
    <filter>
        <filter-name>charsetEncoding</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>charsetEncoding</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>
    <!-- 前端控制器 -->
    <context-param>  
        <param-name>contextConfigLocation</param-name>  
        <!-- 應用上下文配置檔案 -->  
        <param-value>/WEB-INF/springmvc-servlet.xml</param-value>  
    </context-param>  
    <listener>  
        <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>  
    </listener>  
    <servlet>
        <servlet-name>springmvc</servlet-name>
        <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
        <!-- 載入/WEB-INF/[servlet-name]-servlet.xml -->
        <load-on-startup>1</load-on-startup>
    </servlet>
    <servlet-mapping>
        <servlet-name>springmvc</servlet-name>
        <url-pattern>/</url-pattern>
    </servlet-mapping>
</web-app>
 

<?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" 
    xmlns:task="http://www.springframework.org/schema/task"
    xsi:schemaLocation="
        http://www.springframework.org/schema/beans 
        http://www.springframework.org/schema/beans/spring-beans-4.2.xsd 
        http://www.springframework.org/schema/context 
        http://www.springframework.org/schema/context/spring-context-4.2.xsd 
        http://www.springframework.org/schema/mvc 
        http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd 
        http://www.springframework.org/schema/task 
        http://www.springframework.org/schema/task/spring-task-4.2.xsd">

    <!-- 掃描路徑 -->
    <context:component-scan base-package="com.fileDemo.file" >
        <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/>
    </context:component-scan>

    <!-- 配置根檢視 -->
    <mvc:view-controller path="/" view-name="index"/>

    <!-- 啟用基於註解的配置 @RequestMapping, @ExceptionHandler,資料繫結 ,@NumberFormat ,
    @DateTimeFormat ,@Controller ,@Valid ,@RequestBody ,@ResponseBody等  -->
    <mvc:annotation-driven />

    <!-- 靜態資源配置 -->
    <mvc:resources location="/assets/" mapping="/assets/**"></mvc:resources>

    <!-- 檢視層配置 -->
    <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/web/"/>
        <property name="suffix" value=".jsp"/>
    </bean>

     <!-- 支援上傳檔案 -->  
    <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/>
</beans>
 

package com.fileDemo.file;

import java.io.File;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;

import javax.servlet.http.HttpServletRequest;

import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
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;

@Controller
@RequestMapping(value="/file")
public class FileController {
	  @RequestMapping(value="/listFile",method=RequestMethod.GET)
	    public String hello(Model model){
	        model.addAttribute("msg", "檔案上傳");
	        return "index";
	    }
	    
	    @RequestMapping(value="/uploadFile",method=RequestMethod.POST)
	    public String uploadFile(Model model,HttpServletRequest request,@RequestParam(value = "file", required = false) MultipartFile file){
	        
	        String path = request.getServletContext().getRealPath("WEB-INF/upload");
	        File localFile = null;
			if(file != null){
			    localFile = new File(path+"/"+file.getOriginalFilename());  
	            this.copyFile(file, localFile); 
	            System.out.println(localFile.getName());
			}
			
			
	    	model.addAttribute("msg", "檔案上傳成功");
	        return "index";
	    }
	    
	    private static boolean copyFile(MultipartFile src,File f){
	    	boolean flag = false;
	    	InputStream in = null;
	    	OutputStream out = null;
	    	try{
	    		in = src.getInputStream();
	    		out  =  new FileOutputStream(f);
	    		byte[] buff =new byte[1024];
	    		int len=0;
	    		while((len=in.read(buff))>0){
	    			out.write(buff, 0, len);
	    		}
	    		out.close();
	    		in.close();
	    		flag = true;
	    	}catch(Exception e){
	    		
	    	}
	    	return flag;
	    }
}
 

<%@ 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>Java 上傳檔案</title>  
</head>
<%
    
%>

<body>
${msg }
    <form enctype="multipart/form-data" id="_importForm" method="post" action="${pageContext.request.contextPath}/file/uploadFile">
       <input type="file" name="file"/>
       <input type="submit" value="上傳"/>
    </form>
   
</body>
</html>