简单的SERVER CLIENT交流的小程序的疑问

[tmhk123]

SERVER端：

import java.io.*;
import java.net.*;
import java.applet.Applet;
public class talkserver
{
	public static void main(String args[])
	{
		try
		{
			ServerSocket server = null;
			try
			{
				server = new ServerSocket(4700);
			}catch(Exception e)
			{
				System.out.println("can not listen to:" + e);
			}
			Socket socket = null;
			try
			{
				socket = server.accept();
			}catch(Exception e)
			{
				System.out.println("Error:" + e);
			}
			String line;
			BufferedReader is = new BufferedReader(new InputStreamReader(
				socket.getInputStream()));
			PrintWriter os = new PrintWriter(socket.getOutputStream());
			BufferedReader sin = new BufferedReader(new InputStreamReader(System.in));
			System.out.println("Client:" + is.readLine());
			line = sin.readLine();
			while (!line.equals("bye"))	
			{
				os.println(line);
				os.flush();
				System.out.println("Server:" + line);
				System.out.println("Client:" + is.readLine());
				line = sin.readLine();
			}

			is.close();
			os.close();
			socket.close();
			server.close();
		}catch(Exception e)
		{
			System.out.println("Error" + e);
		}
	}
}

CLIENT端：

import java.io.*;
import java.net.*;
public class talkclient
{
	public static void main(String args[])
	{
		try
		{
			Socket socket = new Socket("127.0.0.1",4700);
			BufferedReader sin = new BufferedReader(new InputStreamReader(System.in));
			PrintWriter os = new PrintWriter(socket.getOutputStream());
			BufferedReader is = new BufferedReader(new InputStreamReader(
				socket.getInputStream()));
			String readline;
			readline = sin.readLine();
			while (!readline.equals("bye"))	
			{
				os.println(readline);
				os.flush();
				System.out.println("Client:" + readline);
				System.out.println("Server:" + is.readLine());
				readline = sin.readLine();
			}
			os.close();
			is.close();
			socket.close();
		}catch(Exception e)
		{
			System.out.println("Error" + e);
		}
	}
}

[tmhk123]

他们是怎么建立互相通话的通道的？没有看到一个OutputStream通向客户端（或服务端）SOCKET的通道啊？
程序是对的 可以运行

[eimhee]

程序是对的
服务端通过socket发送消息给客户端
客户段监听socket的到消息

[奔跑的蜗牛_cai_cai]

通过socket建立通信，服务器有个socket = server.accept();，如果没连接上就会抛出异常
然后你的这段代码就是你代码里互发消息和接受消息的核心了，建立连接之后消息都是在流里传递的
BufferedReader is = new BufferedReader(new InputStreamReader(
socket.getInputStream()));
PrintWriter os = new PrintWriter(socket.getOutputStream());
BufferedReader sin = new BufferedReader(new InputStreamReader(System.in));
System.out.println("Client:" + is.readLine());

[Mybeautiful]

1。 server 端先运行后， 会停在这句，
socket = server.accept();


2. 然后Client运行过Socket socket = new Socket("127.0.0.1",4700); 这句时。

3. Server端会继续。 这样Server端的这个socket就正好与Client端沟通。


楼主可以在Eclipse中调这两个程序看看，就明白了。

[Mybeautiful]

贴个完整的，可以支持多客户端聊天的程序供楼主参考，
http://mybeautiful.javaeye.com/blog/659317

[tmhk123]

谢谢楼上的 我想问SERVER端的输出流PrintWriter os = new PrintWriter(socket.getOutputStream());打印流套接在输出流上 依然是正常输出吗

[Mybeautiful]

[Quote=引用 6 楼 tmhk123 的回复:]

谢谢楼上的 我想问SERVER端的输出流PrintWriter os = new PrintWriter(socket.getOutputStream());打印流套接在输出流上 依然是正常输出吗
[/Quote]

是的，这是封装了下OutputStream而已，

    /**
     * Creates a new PrintWriter, without automatic line flushing, from an
     * existing OutputStream.  This convenience constructor creates the
     * necessary intermediate OutputStreamWriter, which will convert characters
     * into bytes using the default character encoding.
     *
     * @param  out        An output stream
     *
     * @see java.io.OutputStreamWriter#OutputStreamWriter(java.io.OutputStream)
     */
    public PrintWriter(OutputStream out) {
	this(out, false);
    }

罗嗦一下，所谓out,就是写出去的，就这个socket了而言，是通过OutputStream发数据给对方的。

[无聊司马]

先看看
回去再试试 是怎么回事
!!!