java编写的代理服务器

基本原理： 代理服务器打开一个端口接收浏览器发来的访问某个站点的请求，从请求的字符串中解析出用户想访问哪个网页，让后通过URL对象建立输入流读取相应的网页内容，最后按照web服务器的工作方式将网页内容发送给用户浏览器 源程序： import java.net.*; import java.io.*; public class MyProxyServer { public static void main(String args[]) { try { ServerSocket ss=new ServerSocket(8080); System.out.println("proxy server OK"); while (true) { Socket s=ss.accept(); process p=new process(s); Thread t=new Thread(p); t.start(); } } catch (Exception e) { System.out.println(e); } } }; class process implements Runnable { Socket s; public process(Socket s1) { s=s1; } public void run() { String content=" "; try { PrintStream out=new PrintStream(s.getOutputStream()); BufferedReader in=new BufferedReader(new InputStreamReader(s.getInputStream())); String info=in.readLine(); System.out.println("now got "+info); int sp1=info.indexOf(' '); int sp2=info.indexOf(' ',sp1+1); String gotourl=info.substring(sp1,sp2); System.out.println("now connecting "+gotourl); URL con=new URL(gotourl); InputStream gotoin=con.openStream(); int n=gotoin.available(); byte buf[]=new byte[1024]; out.println("HTTP/1.0 200 OK"); out.println("MIME_version:1.0"); out.println("Content_Type:text/html"); out.println("Content_Length:"+n); out.println(" "); while ((n=gotoin.read(buf))>=0) { out.write(buf,0,n); } out.close(); s.close(); } catch (IOException e) { System.out.println("Exception:"+e); } } };