SpringMVC上传下载详解编程语言

springmvc上传下载功能 参照网上代码写了一个简单的例子

1、需要导入jar包：ant.jar、commons-fileupload.jar、connom-io.jar。当然spring jar包不可缺少的哦  我这里用的是spring+springmvc+hibernate  可以到官网上直接下载springmvcjar即可

2、springmvc.xml配置

<?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: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-3.2.xsd 
	http://www.springframework.org/schema/mvc 
	http://www.springframework.org/schema/mvc/spring-mvc-3.2.xsd"> 
	 
	 
<!-- 扫描包 --> 
<context:component-scan base-package="com.ai.customer" /> 
 
 <!-- 启动注解 --> 
 <mvc:annotation-driven /> 
 
 
<!-- 文件上传 --> 
 <bean id="multipartResolver"   
   class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> 
   <!-- 设置上传文件的最大尺寸为10MB -->   
   <property name="maxUploadSize">   
       <value>10000000</value>   
   </property>   
  </bean>   
 
 
<!--  静态文件访问 --> 
 <mvc:default-servlet-handler/>  
 <!-- 对模型视图名称的解析，即在模型视图名称添加前后缀 -->  
 <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver" > 
  
 	<property name="prefix" value="/"/> 
 	<property name="suffix" value=".jsp"/>	 
 </bean>  
  
</beans>

3、web.xml配置

<servlet> 
    <servlet-name>spring</servlet-name> 
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> 
    <init-param> 
      <param-name>contextConfigLocation</param-name> 
      <param-value>classpath*:config/spring/spring-*.xml</param-value> 
    </init-param> 
    <load-on-startup>1</load-on-startup> 
  </servlet> 
  <servlet-mapping> 
    <servlet-name>spring</servlet-name> 
    <url-pattern>*.do</url-pattern> 
  </servlet-mapping> 
<filter> 
    <filter-name>codeUTF-8</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>codeUTF-8</filter-name> 
    <url-pattern>/*</url-pattern> 
  </filter-mapping>

4、程序代码块

package com.ai.customer.controller; 
 
import java.io.BufferedInputStream; 
import java.io.BufferedOutputStream; 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.IOException; 
 
import javax.servlet.http.HttpServletRequest; 
import javax.servlet.http.HttpServletResponse; 
 
import org.apache.commons.fileupload.FileUpload; 
import org.apache.commons.io.FileUtils; 
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.servlet.ModelAndView; 
 
@Controller 
public class FileUploadController { 
 
	/* 
	 * SpringMVC中的文件上传 
	 * @第一步：由于SpringMVC使用的是commons-fileupload实现，故将其组件引入项目中 
	 * @这里用到的是commons-fileupload-1.2.1.jar和commons-io-1.3.2.jar 
	 * @第二步：spring-mvx中配置MultipartResolver处理器。可在此加入对上传文件的属性限制 
	 *  <bean id="multipartResolver"   
	 *  class="org.springframework.web.multipart.commons.CommonsMultipartResolver"> 
	 *     <!-- 设置上传文件的最大尺寸为10MB -->   
	 *        <property name="maxUploadSize">   
	 *            <value>10000000</value>   
	 *         </property>   
	 * </bean>  
	 * 第三步：在Controller的方法中添加MultipartFile参数。该参数用于接收表单中file组件的内容 
	 *第四步：编写前台表单。注意enctype="multipart/form-data"以及<input type="file" name="****"/> 
	 *  如果是单个文件 直接使用MultipartFile 即可 
	 */  
 
	/**********************上传代码**************************/ 
	@RequestMapping("/upload.do") 
	public ModelAndView upload(String name, 
			//上传多个文件 
			@RequestParam("file") MultipartFile[] file, 
			HttpServletRequest request) throws IllegalStateException, 
			IOException { 
		 
		//获取文件 存储位置 
		String realPath = request.getSession().getServletContext() 
				.getRealPath("/uploadFile"); 
		 
		File pathFile = new File(realPath); 
		 
		if (!pathFile.exists()) { 
			//文件夹不存 创建文件 
			pathFile.mkdirs(); 
		} 
		for (MultipartFile f : file) { 
			 
			System.out.println("文件类型："+f.getContentType()); 
			System.out.println("文件名称："+f.getOriginalFilename()); 
			System.out.println("文件大小:"+f.getSize()); 
			System.out.println("................................................."); 
			//将文件copy上传到服务器 
			f.transferTo(new File(realPath + "/" + f.getOriginalFilename())); 
			 //FileUtils.copy 
		} 
		//获取modelandview对象 
		ModelAndView view = new ModelAndView(); 
		view.setViewName("redirect:index.jsp"); 
		return view; 
	} 
	 
	 
	 
	/********下载代码*************/ 
    @RequestMapping(value = "download.do")   
    public ModelAndView download(HttpServletRequest request,   
            HttpServletResponse response) throws Exception {   
   
//        String storeName = "Spring3.xAPI_zh.chm";   
    	String storeName="房地.txt"; 
        String contentType = "application/octet-stream";   
        FileUploadController.download(request, response, storeName, contentType);   
        return null;   
    }   
     
     
    //文件下载 主要方法 
    public static void download(HttpServletRequest request,   
            HttpServletResponse response, String storeName, String contentType 
           ) throws Exception {   
    	 
        request.setCharacterEncoding("UTF-8");   
        BufferedInputStream bis = null;   
        BufferedOutputStream bos = null;   
   
        //获取项目根目录 
        String ctxPath = request.getSession().getServletContext()   
                .getRealPath("");   
         
        //获取下载文件露肩 
        String downLoadPath = ctxPath+"/uploadFile/"+ storeName;   
   
        //获取文件的长度 
        long fileLength = new File(downLoadPath).length();   
 
        //设置文件输出类型 
        response.setContentType("application/octet-stream");   
        response.setHeader("Content-disposition", "attachment; filename="   
                + new String(storeName.getBytes("utf-8"), "ISO8859-1"));  
        //设置输出长度 
        response.setHeader("Content-Length", String.valueOf(fileLength));   
        //获取输入流 
        bis = new BufferedInputStream(new FileInputStream(downLoadPath));   
        //输出流 
        bos = new BufferedOutputStream(response.getOutputStream());   
        byte[] buff = new byte[2048];   
        int bytesRead;   
        while (-1 != (bytesRead = bis.read(buff, 0, buff.length))) {   
            bos.write(buff, 0, bytesRead);   
        }   
        //关闭流 
        bis.close();   
        bos.close();   
    }   
	  
}   

5、jsp页面代码 注意：设置表单中form表单的属性为：enctype=”multipart/form-data”

<%@ 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="upload.do" method="post" enctype="multipart/form-data"> 
	 
		<input type="text" name="name" /> 
		<br> 
		<input type="file" name="file"> 
		<br> 
		<input type="file" name="file" /> 
		 
		<input type="submit" value="提交"> 
	</form> 
 
 
</body> 
</html>