在 java 中创建 http 代理服务器-ag捕鱼王app官网

在当今世界，代理几乎是每个人的需要。本教程演示如何在 java 中创建 http 代理服务器。

在 java 中创建 http 代理服务器

代理服务器是客户端和服务器之间的中间方法。本教程将演示一种在 java 中创建 http 代理服务器的方法。

代理服务器有一些优点，包括：

java 支持不同协议的代理处理程序，例如 http、ftp、https 等。proxyhost 和 proxyport 用于 java 中的 http 代理服务器。

让我们尝试在 java 中实现一个 http 代理服务器：

package delftstack;
import java.io.*;
import java.net.*;
public class proxy_server {
    public static void main(string[] args) throws ioexception {
        try {
            string proxy_host = "our proxy server";
            int remote_port = 1025;
            int local_port = 1026;
            // printing the start-up message
            system.out.println("starting proxy for "  proxy_host  ":"  remote_port
                 " on port "  local_port);
            // start the server
            run_server(proxy_host, remote_port, local_port);
        }
        catch (exception e)
        {
            system.err.println(e);
        }
    }
    public static void run_server(string proxy_host, int remote_port, int local_port) throws ioexception {
        // create a serversocket to listen connections
        serversocket server_socket = new serversocket(local_port);
        final byte[] request = new byte[1024];
        byte[] reply = new byte[4096];
        while (true) {
            socket socket_client = null, socket_server = null;
            try {
                // wait for a connection on the local port
                socket_client = server_socket.accept();
                final inputstream inputstreamclient = socket_client.getinputstream();
                final outputstream outputstreamclient = socket_client.getoutputstream();
                // create the connection to the real server.
            try {
                socket_server = new socket(proxy_host, remote_port);
            }
            catch (ioexception e) {
                printwriter out = new printwriter(outputstreamclient);
                out.print("the proxy server could not connect to "  proxy_host  ":"
                  remote_port  ":\n"  e  "\n");
                out.flush();
                socket_client.close();
                continue;
            }
            final inputstream inputstreamserver = socket_server.getinputstream();
            final outputstream outputstreamserver = socket_server.getoutputstream();
            // the thread to read the client's requests and to pass them
            thread new_thread = new thread() {
            public void run() {
                int bytes_read;
                try {
                    while ((bytes_read = inputstreamclient.read(request)) != -1) {
                        outputstreamserver.write(request, 0, bytes_read);
                        outputstreamserver.flush();
                    }
                }
                catch (ioexception e) {
                }
                // close the connections
                try {
                    outputstreamserver.close();
                }
                catch (ioexception e) {
                }
            }
        };
            // client-to-server request thread
            new_thread.start();
            // read server's responses and pass them to the client.
            int bytes_read;
            try {
                while ((bytes_read = inputstreamserver.read(reply)) != -1) {
                    outputstreamclient.write(reply, 0, bytes_read);
                    outputstreamclient.flush();
                }
            }
            catch (ioexception e) {
            }
            // close the connection
            outputstreamclient.close();
           }
           catch (ioexception e) {
               system.err.println(e);
           }
           finally {
               try {
                   if (socket_server != null)
                       socket_server.close();
                   if (socket_client != null)
                       socket_client.close();
               }
               catch (ioexception e) {
               }
           }
       }
   }
}

上面的代码用 java 实现了一个 http 代理服务器。连接成功的输出是：

starting proxy for our proxy server:1025 on port 1026