JAVA高级特性与实战项目第五章网络编程课后作业

2，查找域名的IP地址
package network;

import java.net.InetAddress;
import java.net.UnknownHostException;

public class InetAddressTest {
	public static void main(String[] args) {
		try {
			InetAddress address = InetAddress.getByName("www.baidu.com");
			System.out.println("------淘宝主服务器的地址-----"+"\n"+address);

		} catch (UnknownHostException e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
			
			System.out.println("获取失败");
		}
		InetAddress[] address2;
		try {
			System.out.println("------淘宝主服务器的地址-----");
			address2 = InetAddress.getAllByName("www.taobao.com");
			for (int i = 0; i < address2.length; i++) {
				
				System.out.println(address2[i]);
			}
			
		} catch (UnknownHostException e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		}
		
	}

}


3，模拟用户登入，判断用户名和密码是否正确
package network;

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

public class MyServer {
	public static void main(String[] args) {
		//创建以个服务器
		Socket socket= null;
		InputStream is = null;
		OutputStream io= null;
		ObjectInputStream ois= null;
		try {
			ServerSocket serverSocket = new ServerSocket(8800);
			//打开服务器
			 socket = serverSocket.accept();
			//打开输入和输出流
			 
			is= socket.getInputStream();
			io = socket.getOutputStream();
			 ois = new ObjectInputStream(is);
			Entity entity= (Entity)ois.readObject();
			if(entity.getName().equals("吊炸天")&&entity.getPsword().equals("88888888")) {
				System.out.println("我是服务器，客户登入的信息是"+entity.getName()+","
						+entity.getPsword());
			}else {
				System.out.println("我是服务器，客户登入的信息是"+entity.getName()+","
						+entity.getPsword());
				System.out.println("对不起，没有该用户，已通知客户端登入失败");
			}
			if(entity.getName().equals("吊炸天")&&entity.getPsword().equals("88888888")){
			OutputStream out = socket.getOutputStream();
			out.write("恭喜您，登录成功".getBytes());
			}else {
				OutputStream out = socket.getOutputStream();
				out.write("对不起，没有该用户，登入失败".getBytes());
				
			}

			ois.close();
			io.close();
			is.close();
			
			socket.close();
		} catch (IOException | ClassNotFoundException e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		}


		
	}
	
}
package network;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.net.Socket;
import java.net.UnknownHostException;

public class Man {
	public static void main(String[] args) {
		Socket socket=null;
		OutputStream io=null;
		InputStream is=null;
		ObjectOutputStream oos=null;
		try {
			 socket = new Socket("localhost",8800);
				io = socket.getOutputStream();
				 is= socket.getInputStream();
				 
				 oos = new ObjectOutputStream(io);
				 Entity entity=new Entity();
				 entity.setName("吊炸天");
				 entity.setPsword("");
				 oos.writeObject(entity);
				 socket.shutdownOutput();
				 
					InputStream in = socket.getInputStream();
					Reader reader = new InputStreamReader(in);
					BufferedReader br = new BufferedReader(reader);
					String str = br.readLine();
					System.out.println("我是客户端，服务器返回的内容是:"+str);
				 
					oos.close();
					is.close();
					io.close();
					socket.close();
		} catch (UnknownHostException e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		} catch (IOException e) {
			// TODO 自动生成的 catch 块
			e.printStackTrace();
		}
	}

}