java中文件流实现上传多个文件

//文件下载控制类

package com.zjn.IO;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLEncoder;
import javax.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
@Controller
public class DownController {
	@RequestMapping(value = "/download")
    public String download(HttpServletResponse response, Model model,String files) throws Exception { 
        System.out.println("进入文件下载》》》》》》》》》》》》》》》》》》files==="+files);
        files = new String(files.getBytes("iso8859-1"),"UTF-8");//将iso8859-1编码换成utf-8
        System.out.println("转码后files===="+files);
        //通过文件名找出文件的所在目录
        String URL = "D:\whupload\"+files;
        //得到要下载的文件
        File file = new File(URL);
        //如果文件不存在
        if(!file.exists()){
            //如果文件不存在，进行处理
           int  i=1/0;//系统会报错，除数不能为0.
           // return "modules/cms/front/themes/"+site.getTheme()+"/frontError";
        }
        InputStream inputStream = null;  
        OutputStream outputStream = null;  
      //创建缓冲区
        byte[] b= new byte[1024];  
        int len = 0;  
        try {  
             //读取要下载的文件，保存到文件输入流
             inputStream = new FileInputStream(file);  
             outputStream = response.getOutputStream();  
             response.setContentType("application/force-download");  
             String filename = file.getName();  
             //设置响应头，控制浏览器下载该文件
             response.addHeader("Content-Disposition","attachment; filename=" + URLEncoder.encode(filename, "UTF-8"));  
             response.setContentLength( (int) file.length( ) );  
             //循环将输入流中的内容读取到缓冲区当中      
             while((len = inputStream.read(b)) != -1){
                 //输出缓冲区的内容到浏览器，实现文件下载
                  outputStream.write(b, 0, len);  
             }   
         } catch (Exception e) {  
                e.printStackTrace();  
         }finally{  
                if(inputStream != null){  
                    try {  
                        inputStream.close();  
                        inputStream = null;  
                    } catch (IOException e) {  
                        e.printStackTrace();  
                    }  
                }  
                if(outputStream != null){  
                    try {  
                        outputStream.close();  
                        outputStream = null;  
                    } catch (IOException e) {  
                        e.printStackTrace();  
                    }  
                }  
            }
           
        return null;
    }
}

　　//文件上传实体类

package com.zjn.IO;
import java.io.File;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.UUID;
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.mvc.support.RedirectAttributes;
@Controller
@RequestMapping("/testup")
public class UploadController {
    /**
     * 9.②多个文件上传
     */
    @RequestMapping(value="/uploadBatchFile",method=RequestMethod.POST,consumes="multipart/form-data")
    public String uploadBatchFile(@RequestParam MultipartFile[] files,RedirectAttributes redirectAttributes){
        boolean isEmpty=true;
        try {
            for (MultipartFile multipartFile : files) {
                if(multipartFile.isEmpty()){
                    continue;
                }
                String time=new SimpleDateFormat("yyyyMMddHHmmssSSS").format(new Date());
                String fileName=multipartFile.getOriginalFilename();
                String destFileName="D:\whupload"+File.separator+time+"_"+fileName;
                File destFile=new File(destFileName);
                multipartFile.transferTo(destFile);
                isEmpty=false;
            }
            //int i=1/0;
            //localhost:8086/test/index?message=upload file success
            //redirectAttributes.addAttribute("message","upload file success.");

        } catch (Exception e) {
            // TODO Auto-generated catch block
            redirectAttributes.addFlashAttribute("message", "文件上传失败");
           System.out.println(e.getMessage());
            return "redirect:message.do";
        }
        if(isEmpty){
            redirectAttributes.addFlashAttribute("message", "上传文件为空");
        }else{
            redirectAttributes.addFlashAttribute("message", "文件上传成功");
        }
        return "redirect:message.do";
    }
    @RequestMapping("/message")
    public String message() {
        return "message";
    }
    /**
     * @Method: makeFileName
     * @Description: 生成上传文件的文件名，文件名以：uuid+"_"+文件的原始名称
     * @param filename 文件的原始名称
    * @return uuid+"_"+文件的原始名称
     */ 
     private String makeFileName(String filename){  //2.jpg
         //为防止文件覆盖的现象发生，要为上传文件产生一个唯一的文件名
         return UUID.randomUUID().toString() + "_" + filename;
     }
     
}

　　// jsp页面

<%@ 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>文件上传</title>
</head>
<body>
	<form action="${pageContext.request.contextPath}/testup/uploadBatchFile.do" method="post" enctype="multipart/form-data">
        <input type="file" name="files">
        <input type="file" name="files">
        <button type="submit">上传</button>
</form>
<form action="${pageContext.request.contextPath}/download.do" method="post">
         <input name="files" value="SAP接口说明V2.0(1).xlsx">
        <button type="submit">下载</button>
</form>
</body>
</html>

　　

<!--文件上传下载所用的包============  -->
    <dependency>
    	<groupId>commons-fileupload</groupId>
    	<artifactId>commons-fileupload</artifactId>
    	<version>1.3.1</version>
    </dependency>
    <dependency>
    	<groupId>commons-io</groupId>
    	<artifactId>commons-io</artifactId>
    	<version>2.4</version>
    </dependency>
    <dependency> 
	   <groupId>javax.servlet</groupId> 
	   <artifactId>servlet-api</artifactId> 
	   <version>2.5</version> 
	   <scope>provided</scope> 
    </dependency> 

　　//web文件

<?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"
	version="2.5">
	<display-name>SpringMVC</display-name>
	<servlet>
        <servlet-name>appServlet</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>appServlet</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>
    <listener>
	    <listener-class>com.zjn.oneLogin.dengLu.MyListener</listener-class>
   </listener>
</web-app>

　　//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: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-3.0.xsd  
        http://www.springframework.org/schema/context   
        http://www.springframework.org/schema/context/spring-context-3.0.xsd
        http://www.springframework.org/schema/mvc 
        http://www.springframework.org/schema/mvc/spring-mvc.xsd">  
 
 
     <mvc:annotation-driven />
    <!-- ①：对web包中的所有类进行扫描，以完成Bean创建和自动依赖注入的功能 -->
    <context:component-scan base-package="com.zjn" />

    <!-- 这两个类用来启动基于Spring MVC的注解功能，将控制器与方法映射加入到容器中 -->
    <bean
        class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" />
    <bean
        class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter" />

    <!-- 这个类用于Spring MVC视图解析 -->
    <bean id="viewResolver"
        class="org.springframework.web.servlet.view.InternalResourceViewResolver">
        <property name="prefix" value="/WEB-INF/jsp/"></property>
         <property name="suffix" value=".jsp"></property>
    </bean>
    
    <!-- 避免IE执行AJAX时,返回JSON出现下载文件 -->
	<bean id="mappingJacksonHttpMessageConverter"
		class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
		<property name="supportedMediaTypes">
			<list>
				<value>text/html;charset=utf-8</value>
			</list>
		</property>
	</bean>
 
 
	<!-- 启动Spring MVC的注解功能，完成请求和注解POJO的映射 -->
	<bean
		class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
		<property name="messageConverters">
			<list>
				<ref bean="mappingJacksonHttpMessageConverter" /><!-- json转换器 -->
			</list>
		</property>
	</bean>
    
    <!-- 支持上传文件 -->
	<bean id="multipartResolver"
		class="org.springframework.web.multipart.commons.CommonsMultipartResolver" >
		<!-- 100M -->
		<property name="maxUploadSize" value="10485760000"></property>	
		<property name="defaultEncoding" value="utf-8"></property>   
	</bean>
    <!--  数据库配置-->
    <!-- 使用配置文件 -->
    <context:property-placeholder location="classpath:properties/mysql.properties"/>
    
    <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"
        init-method="init" destroy-method="close">
        <property name="driverClassName" value="${jdbc.driverClassName}"/>
        <property name="url" value="${jdbc.url}"/>
        <property name="username" value="${jdbc.username}"/>
        <property name="password" value="${jdbc.password}"/>
        <!-- 连接池最大使用连接数 -->
        <property name="maxActive" value="20"/>
        <!-- 初始化连接大小 -->
        <property name="initialSize" value="1"/>
        <!-- 获取连接最大等待时间 -->
        <property name="maxWait" value="60000"/>
        <!-- 连接池最小空闲 -->
        <property name="minIdle" value="3"/>
        <!-- 自动清除无用连接 -->
        <property name="removeAbandoned" value="true"/>
        <!-- 清除无用连接的等待时间 -->
        <property name="removeAbandonedTimeout" value="180"/>
        <!-- 连接属性 -->
        <property name="connectionProperties" value="clientEncoding=UTF-8"/>
    </bean>

    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
        <!--指定实体类映射文件，可以指定同时指定某一包以及子包下面的所有配置文件 -->
        <property name="mapperLocations"  value="classpath:mapper/**/*.xml"/>
        <!--mybatis全局配置文件 -->
        <property name="configLocation" value="classpath:mybatis/mybatis-config.xml" />
        <property name="dataSource" ref="dataSource" />
    </bean>

    <!-- spring与mybatis整合配置，扫描所有dao -->
    <bean class="org.mybatis.spring.mapper.MapperScannerConfigurer">
        <property name="basePackage" value="com.zjn.dao"/>
        <property name="sqlSessionFactoryBeanName" value="sqlSessionFactory"/>
    </bean>
   
    
</beans>  

　　// properties  文件

jdbc.driverClassName=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://127.0.0.1:3306/peixian
jdbc.username=root
jdbc.password=123456