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java http proxy

package afu.proxy;

import java.net.*;
import java.io.*;

import org.apache.commons.httpclient.*;
import org.apache.commons.httpclient.methods.*;

public class HttpProxy extends Thread
{
    public static int threadNumber = 0;
    private static MultiThreadedHttpConnectionManager 
                        connectionManager = new MultiThreadedHttpConnectionManager();
    private Socket proxyServer;
    
    public HttpProxy(Socket ps)
    {
        threadNumber ++;
        proxyServer = ps;
    }
    
    public void run()
    {                
        DataInputStream proxyIn = null;
        try
        {
            String clientIP = proxyServer.getInetAddress().toString().substring(1);
            System.out.println("client ip is " + clientIP);
            
            /**
             * visit outside websites through proxy server
             */
            proxyIn = new DataInputStream(proxyServer.getInputStream());    
            String head = proxyIn.readLine();//read the first row
            String method = getMethod(head);
            String requestUrl = getUrl(method.length() + 1 ,head);
            proxy(method,requestUrl);
            
            threadNumber --;
        }
        catch(Exception e)
        {
            //e.printStackTrace();
        }
        finally
        {
            try
            {
                if(proxyIn!=null)
                   proxyIn.close();
                proxyIn = null;
            }
            catch(Exception e)
            {
            }
        }        
    }
    
    private void proxy(final String methodName,final String requestUrl)
    {        
        DataOutputStream proxyOut = null;
        InputStream webIn = null;
        HttpMethod method = null;
        try
        {
            HttpClient client = new HttpClient(connectionManager);
            if("POST".equals(methodName))
               method = new PostMethod(requestUrl);
            else
               method = new GetMethod(requestUrl);            
            client.executeMethod(method);                                               
            
            webIn = new DataInputStream(new BufferedInputStream(method.getResponseBodyAsStream(),10240));
            proxyOut = new DataOutputStream(proxyServer.getOutputStream());
            int num = webIn.read();
            while(num!=-1)
            {
                proxyOut.write(num);
                num = webIn.read();
            }
            proxyOut.flush();
            client = null;
        }//try
        catch(Exception e)
        {
            //e.printStackTrace();
        }
        finally
        {
            try
            {
                proxyOut.close();
                webIn.close();
                if(method!=null)
                   method.releaseConnection();
                proxyOut = null;
                webIn = null;
                proxyServer.close();
            }
            catch(Exception e)
            {
            }                
        }        
    }

    private String getMethod(final String head)
    {
        if(head.indexOf("POST")!=-1)
           return "POST";    
        return "GET";
    }    
    
    private String getUrl(final int startPos,final String head)
    {
        int loc = head.indexOf("HTTP/1.");
        return head.substring(startPos,loc - 1);
    }    
}

package afu.proxy;

import java.net.ServerSocket;
import java.net.Socket;

public class StartProxy
{    
    public void doProxy() 
    {        
        int port = 808;
        System.out.println("在端口" + port +"启动代理服务");
        try
        {
            ServerSocket ss = new ServerSocket(port);
            while(true)
            {
                if(HttpProxy.threadNumber > 8)
                   try 
                   {
                       Thread.sleep(500); 
                   } 
                   catch(Exception ignored ) 
                   {}
                else
                {
                    Socket socket = ss.accept();               
                    HttpProxy proxy = new HttpProxy(socket);           
                    proxy.start();
                }
            }
        }    
        catch(Exception e)
        {
            e.printStackTrace();
        }
    }
}

网上找了很多开源的java  http代理程序，都不好用，最后还是自己写了一个。

posted on 2008-08-27 15:41 afunms 阅读(2453) 评论(1)  编辑  收藏

Feedback

# re: java http proxy 2010-03-23 08:31 Ganky

你真牛！感觉比我以前下载的好  回复  更多评论   



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