import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.logging.Level;
import java.util.logging.Logger;
/** 
 * 
 * @author whn6325689 
 */
public class server {
	//服務(wù)器端 
	public static void main(String[] args) {
		try {
			//1.創(chuàng)建一個(gè)服務(wù)器端Socket，即serverSocket，指定綁定的端口，并監(jiān)聽(tīng)此端口。 
			ServerSocket serverSocket=new ServerSocket(8888);
			//2.調(diào)用serverSocket的accept（）方法，等待客戶(hù)端的連接 
			System.out.println("==服務(wù)器即將啟動(dòng)，等待客戶(hù)端的連接==");
			Socket socket=serverSocket.accept();
			//3.獲取輸入流用來(lái)讀取客戶(hù)端所發(fā)出的登錄信息 
			InputStream is=socket.getInputStream();
			//字節(jié)輸入流 
			InputStreamReader isr=new InputStreamReader(is);
			//將字節(jié)流轉(zhuǎn)化為字符流 
			//為字符流添加緩沖 
			BufferedReader bufferedReader=new BufferedReader(isr);
			String info=null;
			//循環(huán)讀取客戶(hù)端提交的信息 
			while((info=bufferedReader.readLine())!=null){
				System.out.println("我是服務(wù)器，客戶(hù)端提交的信息是："+info);
			}
			socket.shutdownInput();
			//4.獲取輸出流，響應(yīng)客戶(hù)端的請(qǐng)求 
			OutputStream os= socket.getOutputStream();
			PrintWriter pw=new PrintWriter(os);
			//轉(zhuǎn)化為打印流 
			pw.write("歡迎您！");
			pw.flush();
			//刷新緩存 
			//5.關(guān)閉相關(guān)的資源 
			bufferedReader.close();
			is.close();
			isr.close();
			socket.close();
			serverSocket.close();
			os.close();
			pw.close();
		}
		catch (IOException ex) {
			Logger.getLogger(server.class.getName()).log(Level.SEVERE, null, ex);
		}
	}
}

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.net.Socket;
import java.util.logging.Level;
import java.util.logging.Logger;
/** 
 * 
 * @author whn6325689 
 */
public class client {
	//客戶(hù)端 
	public static void main(String[] args) {
		try {
			//1.創(chuàng)建客戶(hù)端Socket，指定服務(wù)器地址和端口號(hào) 
			Socket socket=new Socket("127.0.0.1", 8888);
			//2.獲取輸出流，用來(lái)向服務(wù)器發(fā)送信息 
			OutputStream os=socket.getOutputStream();
			//字節(jié)輸出流 
			//轉(zhuǎn)換為打印流 
			PrintWriter pw=new PrintWriter(os);
			pw.write("用戶(hù)名：admin；密碼：admin");
			pw.flush();
			//刷新緩存，向服務(wù)器端輸出信息 
			//關(guān)閉輸出流 
			socket.shutdownOutput();
			//3.獲取輸入流，用來(lái)讀取服務(wù)器端的響應(yīng)信息 
			InputStream is=socket.getInputStream();
			BufferedReader br=new BufferedReader(new InputStreamReader(is));
			String info=null;
			while((info=br.readLine())!=null){
				System.out.println("我是客戶(hù)端，服務(wù)器端返回的信息是："+info);
			}
			//4.關(guān)閉資源 
			br.close();
			is.close();
			pw.close();
			os.close();
			socket.close();
		}
		catch (IOException ex) {
			Logger.getLogger(client.class.getName()).log(Level.SEVERE, null, ex);
		}
	}
}

==服務(wù)器即將啟動(dòng)，等待客戶(hù)端的連接== 
我是服務(wù)器，客戶(hù)端提交的信息是：用戶(hù)名：admin；密碼：admin

我是客戶(hù)端，服務(wù)器端返回的信息是：歡迎您！