网络编程（自定义浏览器-Tomcat服务器）

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本文通过两个Java程序演示了如何模拟HTTP请求与响应的过程。首先通过Server程序监听特定端口并接收来自客户端的HTTP请求，然后使用Client2程序向该端口发送HTTP请求并展示服务器返回的响应信息。

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//一、获取客户端HTTP协议
//1、模拟http请求，先开启一个serverSocket服务，开启下面类Server.main()方法
//2、然后开启浏览器，输入http://127.0.0.1:10002
//在服务器窗口即打印出
//GET / HTTP/1.1
//Accept: */*
//Accept-Language: zh-cn
//User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; WOW64; Trident/4.
//0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Cent
//er PC 6.0; .NET4.0C; .NET4.0E)
//Accept-Encoding: gzip, deflate
//Host: 127.0.0.1:10002
//Connection: Keep-Alive

import java.net.*;
import java.io.*;
class Server
{
	public static void main(String[] args) throws Exception
	{
		final ServerSocket server = new ServerSocket(10002);
		
		while(true)
		{
			final Socket socket = server.accept();
			new Thread(new Runnable()
			{
				public void run()
				{
					try
					{
						String ip = socket.getInetAddress().getHostAddress();
						System.out.println(ip + ".....connected");

						BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
						String line = null;
						while((line = br.readLine())!=null)
						{
							System.out.println(line);
						}

					}
					catch (Exception e)
					{
						e.printStackTrace();
						System.out.println("服务器有问题");
					}finally
					{	
						System.out.println("finally");
						if(socket !=null)
							try
							{
								socket.close();
							}
							catch (Exception e)
							{
								System.out.println("socket 关闭失败");
							}
					}
					
				}
			}).start();
		}
	}
}

二、获取服务器返回的http协议
//1、开启本地的tomcat服务
//2、将下面Client2中第一句代码的端口改为 tomcat的端口，运行Client2的main()
//即可获取
/*
HTTP/1.1 505 HTTP Version Not Supported
Server: Apache-Coyote/1.1
Date: Mon, 26 May 2014 05:58:58 GMT
Connection: close
*/

class Client2
{
	public static void main(String[] args) throws Exception
	{
		Socket socket = new Socket(InetAddress.getByName("127.0.0.1"),10002);
		

		PrintWriter pw = new PrintWriter(socket.getOutputStream(),true);
		pw.println("#break");				
		pw.println("GET / HTTP/1.1");
		pw.println("Accept: */*");
		pw.println("Accept-Language: zh-cn");
		pw.println("Accept-Encoding: gzip, deflate");
		pw.println("Host: 127.0.0.1:10002");
		pw.println("Connection: closed");
		pw.println();
		pw.println();
		pw.println("#break");
		

		BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
		String line = null;
		while((line = br.readLine())!=null)
		{
			System.out.println(line);
		}
		socket.close();
		
		
	}
}

//三、模拟http协议发送、与接收
//开启Server2 Client2 即模拟实现

class Server2
{
	public static void main(String[] args) throws Exception
	{
		final ServerSocket server = new ServerSocket(10002);
		

		while(true)
		{
			final Socket socket = server.accept();

			new Thread(new Runnable()
			{
				public void run()
				{
					
					try
					{
						String ip = socket.getInetAddress().getHostAddress();
						System.out.println(ip + ".....connected");

						BufferedReader br = new BufferedReader(new InputStreamReader(socket.getInputStream()));
						String line = null;
						String breakPoint = br.readLine();


						while((line = br.readLine())!=null)
						{	
							if(breakPoint.equals(line))
								break;
							else
								System.out.println(line);
						}

						PrintWriter pw = new PrintWriter(socket.getOutputStream(),true);
						pw.println("HTTP/1.1 505 HTTP Version Not Supported");
						pw.println("Server: Apache-Coyote/1.1");
						pw.println("Date: Mon, 26 May 2014 05:58:58 GMT");
						pw.println("Connection: close");

					}
					catch (Exception e)
					{
						e.printStackTrace();
						System.out.println("服务器有问题");
					}finally
					{	
						if(socket !=null)
							try
							{
								socket.close();
							}
							catch (Exception e)
							{
								System.out.println("socket 关闭失败");
							}

					}
					
				}
			}).start();	
		}

		

	}
}