java - 套接字 java - 初学者

Question

我开始使用 java 并且遇到套接字问题，我希望我的服务器会见并问候一个值，然后想将其转换为 String，然后包含在条件 如果。但是，尽管服务器毫无问题地批准了文本，但我无法传递 String 的值。

/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package javasockets;

import java.io.DataInputStream;
import java.io.IOException;
import static java.lang.System.exit;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

/**
 *
 * @author Nuno
 */
public class JavaSockets {

    public static String T = "s";

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws IOException {
        // TODO code application logic here
        try {
            ServerSocket sckServer = new ServerSocket(5000);

            System.out.println("Porta 5000 aberta!");
            Socket sck;

            while (true) {

                sck = sckServer.accept();
                try (Scanner entrada = new Scanner(sck.getInputStream())) {

                    while (entrada.hasNextLine()) {

                        System.out.println(entrada.nextLine());
                    }
                    String texto = entrada.nextLine();
                    System.out.println("ola" + texto);
                    String fnames = texto;
                    System.out.println("ola" + fnames);
                    System.out.println(texto);
                    if (texto.equals(T)) {
                        System.out.println("LOOL");
                    }
                }
                sckServer.close();
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

客户端代码，发送消息到socket 127.0.0.1", 5000

package javasockets;

import java.io.IOException;
import java.io.PrintStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.net.UnknownHostException;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 *
 * @author Nuno
 */
public class cliente {

    public static void main(String[] args) throws IOException {
        while (true) {
            Socket cliente = new Socket("127.0.0.1", 5000);
            System.out.println("O cliente se conectou ao servidor!");

            Scanner teclado = new Scanner(System.in);
            PrintStream saida = new PrintStream(cliente.getOutputStream());

            while (teclado.hasNextLine()) {
                saida.println(teclado.nextLine());
            }
            saida.flush();
            saida.close();
            teclado.close();
        }

    }

    static Object getInetAddress() {
        throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
    }
}

谢谢你的帮助

Answer 1

每次调用 nextLine() 方法时，服务器都会等待接收一个新的字符串，但在您的客户端执行时只会发送一个字符串。

所以尝试:

/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/

import java.io.DataInputStream;
import java.io.IOException;
import static java.lang.System.exit;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.Scanner;

/**
 *
 * @author Nuno
 */
public class JavaSockets {

    public static String T = "s";

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) throws IOException {
        // TODO code application logic here
        try {
            ServerSocket sckServer = new ServerSocket(5000);

            System.out.println("Porta 5000 aberta!");
            Socket sck;

            while (true) {

                sck = sckServer.accept();
                try (Scanner entrada = new Scanner(sck.getInputStream())) {

                    while (entrada.hasNextLine()) {

                        String texto = entrada.nextLine();

                        System.out.println(texto);
                        System.out.println("ola" + texto);

                        String fnames = texto;

                        System.out.println("ola" + fnames);
                        System.out.println(texto);
                        if (texto.equals(T)) {
                            System.out.println("LOOL");
                        }
                    }

                }
                sckServer.close();
            }

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}