实现服务器端和客户端的Socket通信

使用ServerSocket和Socket实现服务器端和客户端的Socket通信

 

总结：

1) 建立Socket连接

2) 获得输入/输出流

3）读/写数据

4) 关闭输入/输出流

5) 关闭Socket

1. 编写一个网络应用程序，有客户端与服务器端，客户端向服务器端发送一个字符串，

服务器收到该字符串后将其打印到命令行上，然后向客户端返回该字符串的长度，最后，

客户端输出服务器端返回的该字符串的长度。

 

 

SockectServerTest

 

import java.io.InputStream;
import java.io.OutputStream;
import java.net.ServerSocket;
import java.net.Socket;


public class SocketServerTest
{
	
	
	public static void main(String[] args) throws Exception
	{
		ServerSocket ss = new ServerSocket(9999);
		Socket socket = ss.accept();
		
		InputStream is = socket.getInputStream();
		OutputStream os = socket.getOutputStream();
		
		byte[] buffer = new byte[100];
		
		int length = is.read(buffer);
		
		String content = new String(buffer,0,length);
		
		System.out.println("read from client:" + content);
		
		int strLength = content.length();
		
		String str = String.valueOf(strLength);
		
		os.write(str.getBytes());
		
		is.close();
		os.close();
		socket.close();
	}
}

 ClientTest

 

import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;

public class ClientTest
{

	public static void main(String[] args) throws Exception
	{
		Socket socket = new Socket("localhost",9999);
		
		InputStream is = socket.getInputStream();
		
		OutputStream os = socket.getOutputStream();
		
		String content = "This comes from client";
		os.write(content.getBytes());
		
		
		byte[] b = new byte[100];
		int length = is.read(b);
		String str = new String(b,0,length);
		System.out.println("string's  length:" + str);
		
		is.close();
		os.close();
		socket.close();
	}

}