servlet MoreDownloadServlet.java：
import java.io.BufferedInputStream; 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.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import cn.itcast.util.FirxFoxUtil; /** * 下载案例后台 * @author Administrator * */ public class MoreDownloadServlet extends HttpServlet { private static final long serialVersionUID = 1L; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // 获取绝对路径 String filepath = request.getParameter("filepath"); filepath = new String(filepath.getBytes("ISO-8859-1"),"UTF-8"); System.out.println("文件的绝对路径："+filepath); String filename = null; // 截取文件的名称 int index = filepath.lastIndexOf("\"); if(index != -1){ filename = filepath.substring(index + 1); } // 先判断是什么浏览器 String agent = request.getHeader("USER-AGENT"); System.out.println(agent); // 判断当前是什么浏览器 if(agent.contains("Firefox")){ // 采用BASE64编码 filename = FirxFoxUtil.base64EncodeFileName(filename); }else{ // IE GOOGLE filename = URLEncoder.encode(filename, "UTF-8"); // URL编码会空格编成+ filename = filename.replace("+", " "); } // 创建file对象 File file = new File(filepath); // 输入流 InputStream in = new BufferedInputStream(new FileInputStream(file)); // 设置两个响应头 response.setContentType(this.getServletContext().getMimeType(filename)); response.setHeader("Content-Disposition", "attachment;filename="+filename); // 一个流 OutputStream os = response.getOutputStream(); int b; while((b = in.read()) != -1){ os.write(b); } os.close(); in.close(); } }
util：
Base64Util.java
import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import sun.misc.BASE64Encoder; public class Base64Util { public static void main(String args[]) throws IOException { System.out.print("请输入用户名:"); BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); String userName = in.readLine(); System.out.print("请输入密码:"); String password = in.readLine(); BASE64Encoder encoder = new BASE64Encoder(); System.out.println("编码后的用户名为:" + encoder.encode(userName.getBytes())); System.out.println("编码后的密码为:" + encoder.encode(password.getBytes())); } }
FirxFoxUtil.java：
import java.io.UnsupportedEncodingException; import sun.misc.BASE64Encoder; public class FirxFoxUtil { public static String base64EncodeFileName(String fileName) { BASE64Encoder base64Encoder = new BASE64Encoder(); try { return "=?UTF-8?B?" + new String(base64Encoder.encode(fileName .getBytes("UTF-8"))) + "?="; } catch (UnsupportedEncodingException e) { e.printStackTrace(); throw new RuntimeException(e); } } }
jsp moredownload.jsp：
<%@page import="java.net.URLEncoder"%> <%@page import="java.io.File"%> <%@ 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>My JSP 'moredownload.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"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <% // 指定一个根目录 String rootpath = "E:\downfile"; // 创建File对象 File rootfile = new File(rootpath); // 创建队列 Queue<File> queue = new LinkedList<File>(); // 把根目录入队 queue.offer(rootfile); while(!queue.isEmpty()){ // 先把根目录出队 File file = queue.poll(); File [] files = file.listFiles(); // 循环遍历，拿到每一个file对象，操作file的判断是否是文件还是文件夹 for(File f : files){ if(f.isFile()){ // 文件 %> <a href="/day22/moredownload?filepath=<%=URLEncoder.encode(f.getCanonicalPath(), "UTF-8")%>"><%=f.getName() %></a><br/> <% }else{ //文件夹 queue.offer(f); } } } %> </body> </html>