Java網路編程--FTP協議模擬用戶客戶端登錄-有解無憂

主要思路：

用戶在客戶端輸入用戶名發送給服務器
服務器比對用戶名如果正確回傳客戶端一個值表示輸入正確
客戶端收到服務器回傳的表示用戶名輸入正確的值，讓用戶繼續輸入密碼
服務器收到用戶輸入的密碼進行比對如果輸入正確給用戶回傳登陸成功

package Login;

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

/**
 * 
 * @author fzl
 * @Dare 2020-11-22 14:44:05
 * @Description
 *
 */
public class fuwuqi {
	public static void main(String[] args) throws IOException {
		ServerSocket serverSocket = new ServerSocket(1111);
		Socket socket = serverSocket.accept();
		/*
		 * 獲取客戶端用戶輸入的用戶名
		 * 
		 * 服務器端保存的用戶名和密碼為： username：fzl password：123
		 */
		String username = "fzl";
		String password = "123";
		InetAddress address = socket.getInetAddress();
		address.getHostName();
		InputStream inputStream = socket.getInputStream();
		byte[] byt = new byte[1024];
		int len = inputStream.read(byt);
		String username_receive = new String(byt, 0, len);
		System.out.println(address + "---->" + username_receive);

		serverSocket.close();
		socket.close();
		inputStream.close();

		if (username_receive.equals(username)) {
			/*
			 * 判斷用戶輸入的用戶名是否正確 如果正確發送給客戶端一串文字 讓客戶輸入密碼 如果不正確 告訴用戶錯誤
			 */
			Socket socket_return = new Socket(InetAddress.getByName(String 客戶端IP), 2222);
			OutputStream outputStream = socket_return.getOutputStream();
			String string_return = "用戶名輸入正確 請輸入密碼";
			outputStream.write(string_return.getBytes());
			socket_return.close();
			outputStream.close();

		} else {
			Socket socket_return = new Socket(InetAddress.getByName(String 客戶端IP), 2222);
			OutputStream outputStream = socket_return.getOutputStream();
			String string_return = "用戶名輸入錯誤";
			outputStream.write(string_return.getBytes());
			socket_return.close();
			outputStream.close();
		}

	}
}

package Login;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;
/**
 * 
 * @author fzl
 * @Dare 2020-11-22 16:27:25
 * @Description
 *
 */
public class kehuduan2 {
public static void main(String[] args) throws IOException {
	/*
	 * 接收服務器回傳的值，如果正確就繼續輸密碼
	 */

	ServerSocket serverSocket = new ServerSocket(2222);
	Socket socket_receive = serverSocket.accept();
	InetAddress address = socket_receive.getInetAddress();
	address.getHostName();
	InputStream inputStream = socket_receive.getInputStream();
	byte[] byt = new byte[1024];
	int len = inputStream.read(byt);
	String recieve_return = new String(byt,0,len);
	System.out.println(address+"---->"+recieve_return);
	serverSocket.close();
	socket_receive.close();
	inputStream.close();
	
	
	if("用戶名輸入正確 請輸入密碼".equals(recieve_return)) {
		Socket socket_sendpsd = new Socket(InetAddress.getByName(String 服務器IP),3333);
		OutputStream outputStream_sendpsd = socket_sendpsd.getOutputStream();
		Scanner sc = new Scanner(System.in);
		System.out.println("請輸入您密碼");
		String passwordString =sc.next() ;
		outputStream_sendpsd.write(passwordString.getBytes());
		socket_sendpsd.close();
	}
}
}

package Login;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
/**
 * 
 * @author fzl
 * @Dare 2020-11-22 16:27:02
 * @Description
 *
 */
public class fuwuqi2 {
public static void main(String[] args) throws IOException {
	/*
	 * 再次接收客戶端發回的密碼 如果密碼正確 發回客戶端 密碼正確登陸成功 字樣
	 * 如果密碼錯誤發回客戶端 密碼錯誤登陸失敗字樣
	 */
	String username = "fzl";
	String password = "123";
	ServerSocket serverSocket_receivepsd = new ServerSocket(3333);
	Socket socket_receivepsd = serverSocket_receivepsd.accept();
	InetAddress address = socket_receivepsd.getInetAddress();
	address.getHostName();
	InputStream inputStream_receivepsd = socket_receivepsd.getInputStream();
	byte[] byt_receivepsd = new byte[1024];
	int len_receivepsd = inputStream_receivepsd.read(byt_receivepsd);
	String password_receive = new String(byt_receivepsd,0,len_receivepsd);
	System.out.println(address+"---->"+password_receive);
	serverSocket_receivepsd.close();
	socket_receivepsd.close();
	inputStream_receivepsd.close();
	/*
	 * 將結果發送回客戶端
	 */
	if(password_receive.equals(password)) {
		Socket socket_return_denglujieguo =new Socket(InetAddress.getByName(String 客戶端IP),4444);
		OutputStream outputStream_denglujieguo = socket_return_denglujieguo.getOutputStream();
		String string_return_denglujieguo = "密碼正確 登陸成功";
		outputStream_denglujieguo.write(string_return_denglujieguo.getBytes());
		socket_return_denglujieguo.close();
		outputStream_denglujieguo.close();
	}else {
		Socket socket_return_denglujieguo =new Socket(InetAddress.getByName(String 客戶端IP),4444);
		OutputStream outputStream_denglujieguo = socket_return_denglujieguo.getOutputStream();
		String string_return_denglujieguo = "密碼錯誤 登陸失敗";
		outputStream_denglujieguo.write(string_return_denglujieguo.getBytes());
		socket_return_denglujieguo.close();
		outputStream_denglujieguo.close();
	}
		
	
}
}

package Login;

import java.io.IOException;
import java.io.InputStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
/**
 * 
 * @author fzl
 * @Dare 2020-11-22 16:27:33
 * @Description
 *
 */
public class kuhuduan3 {
public static void main(String[] args) throws IOException {
	/*
	 * 客戶端接收服務器端發回的結果
	 */
	ServerSocket serverSocket_receive_jieguo = new ServerSocket(4444);
	Socket socket_receive_jieguo = serverSocket_receive_jieguo.accept();
	InetAddress address = socket_receive_jieguo.getInetAddress();
	address.getHostName();
	InputStream inputStream_jieguo = socket_receive_jieguo.getInputStream();
	byte[] byt_jieguo = new byte[1024];
	int len_jieguo = inputStream_jieguo.read(byt_jieguo);
	String recieve_return_jieguo = new String(byt_jieguo,0,len_jieguo);
	System.out.println(address+"---->"+recieve_return_jieguo);
	
	serverSocket_receive_jieguo.close();
	socket_receive_jieguo.close();
	inputStream_jieguo.close();
	
}
}

package Login;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetAddress;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;
import java.nio.channels.InterruptedByTimeoutException;
import java.util.Scanner;
/**
 * 
 * @author fzl
 * @Dare 2020-11-22 14:42:00
 * @Description
 *
 */
public class kehuduan {
public static void main(String[] args) throws UnknownHostException, IOException {
	Socket socket = new Socket(InetAddress.getByName(String 服務器IP),1111);
	OutputStream outputStream = socket.getOutputStream();
	InetAddress address = socket.getInetAddress();
	address.getHostName();
	/*
	 * 向服務器端發送用戶輸入的用戶名
	 */
	Scanner sc = new Scanner(System.in);
	System.out.println("請輸入您的用戶名");
	String usernameString = sc.next();
	outputStream.write(usernameString.getBytes());
	socket.close();

}
}

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