📄 usewebredirector.java
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import java.net.*;import java.io.*;import java.util.*;public class useWebRedirector implements Runnable { //定义私有属性 private int port; private String newSite; //构造器 public useWebRedirector(String site, int port) { this.port = port; this.newSite = site; } //建立线程并启动 public void run() { try { //新建ServerSocket对象 ServerSocket server = new ServerSocket(this.port); //输出重定向信息 System.out.println("Redirecting connections on port " + server.getLocalPort() + " to " + newSite); while (true) { try { //建立Socket对象 Socket s = server.accept(); //启动线程 Thread t = new RedirectThread(s); t.start(); } // end try catch (IOException e) { } } // end while } // end try catch (BindException e) { //输出异常信息 System.err.println("Could not start server. Port Occupied"); } catch (IOException e) { System.err.println(e); } } // end run class RedirectThread extends Thread { private Socket connection; //线程构造器 RedirectThread(Socket s) { this.connection = s; } public void run() { try { //缓冲输出流 Writer out = new BufferedWriter(new OutputStreamWriter( connection.getOutputStream(), "ASCII")); //获得输入流 Reader in = new InputStreamReader(new BufferedInputStream(connection.getInputStream())); // 仅读取第一行 StringBuffer request = new StringBuffer(80); while (true) { //从缓冲里读取输入流 int c = in.read(); //根据输入中止循环 if (c == '\r' || c == '\n' || c == -1) break; //在字符串缓冲里增加字符 request.append((char) c); } //获取缓冲字符串信息 String get = request.toString(); //判断空格位置 int firstSpace = get.indexOf(' '); int secondSpace = get.indexOf(' ', firstSpace+1); //获取第一个空格和第二个空格之间的子串 String theFile = get.substring(firstSpace+1, secondSpace); if (get.indexOf("HTTP/") != -1) { out.write("HTTP/4.0 302 FOUND\r\n"); //新建Date对象 Date now = new Date(); out.write("Date: " + now + "\r\n"); out.write("Server: Redirector 1.0\r\n"); out.write("Location: " + newSite + theFile + "\r\n"); out.write("Content-type: text/html\r\n\r\n"); out.flush(); } // 不是所有的浏览器都支持重定向，所以需要创建HTML说明文献移到的位置 out.write("<HTML><HEAD><TITLE>Document moved</TITLE></HEAD>\r\n"); out.write("<BODY><H1>Document moved</H1>\r\n"); out.write("The document " + theFile + " has moved to\r\n<A HREF=\"" + newSite + theFile + "\">" + newSite + theFile + "</A>.\r\n Please update your bookmarks<P>"); out.write("</BODY></HTML>\r\n"); out.flush(); } // end try catch (IOException e) { } finally { try { if (connection != null) connection.close(); } catch (IOException e) {} } } // end run }//end RedirectThread public static void main(String[] args) { //设置局域变量 int thePort; String theSite; try { theSite = args[0]; // trim trailing slash if (theSite.endsWith("/")) { theSite = theSite.substring(0, theSite.length()-1); } } catch (Exception e) { //异常处理 System.out.println("Usage: java Redirector http://www.newsite.com/ port"); return; } try { thePort = Integer.parseInt(args[1]); } catch (Exception e) { thePort = 80; } //启动新的重定向线程 Thread t = new Thread(new useWebRedirector(theSite, thePort)); t.start(); } // end main} //end useWebRedirector⌨️ 快捷键说明
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