javaWeb实现文件下载

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今天学习了JavaWeb实现文件下载，为了以后方便查找并让需要的人学习，今儿把代码献上！！！！

首先写一个jsp页面

字体加粗的为主要内容：

download.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>文件下载</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"><!--<link rel="stylesheet" type="text/css" href="styles.css">-->  </head>    <body>  <a href="/download/DownloadServlet?filename=1.jpg">文件下载</a>  </body></html>

然后在定义一个Servlet，如下：

DownloadServlet：

public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {response.setCharacterEncoding("UTF-8");//设置ContentType字段值response.setContentType("text/html;charset=utf-8");//获取所要下载的文件名称String filename = request.getParameter("filename");//下载文件所在目录String folder = "/filename/";//通知浏览器以下载的方式打开response.addHeader("Content-type", "appllication/octet-stream");response.addHeader("Content-Disposition", "attachment;filename="+filename);//通知文件流读取文件InputStream in = getServletContext().getResourceAsStream(folder+filename);//获取response对象的输出流OutputStream out = response.getOutputStream();byte[] buffer = new byte[1024];int len;//循环取出流中的数据while((len = in.read(buffer)) != -1){out.write(buffer,0,len);}}

效果图：

用到的架包：commons-fileupload-1.3.1.jar、commons-io-2.4.jar

本例子中用到的架包下载地址：http://commons.apache.org/

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