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使用Java套接字的客户机-服务器通信

java sockets

使用Java套接字的客户机-服务器通信,java,sockets,Java,Sockets,我用java构建了一个带有客户端和服务器套接字的程序，该程序从客户端获取一个数字，并将其乘以2。 代码不允许我在客户端输入数字。 代码： 客户端： public class cli { public static void main(String args[]) throws UnknownHostException, IOException{ Scanner in = new Scanner(System.in); int number,temp;

我用java构建了一个带有客户端和服务器套接字的程序，该程序从客户端获取一个数字，并将其乘以2。 代码不允许我在客户端输入数字。 代码：

客户端：

public class cli {

    public static void main(String args[]) throws UnknownHostException, IOException{
        Scanner in = new Scanner(System.in);
        int number,temp;
        Socket s = new Socket("127.0.0.1", 1342);
        Scanner c1 = new Scanner(s.getInputStream());
        System.out.println("Enter any number");
        number = in.nextInt();
        PrintStream p = new PrintStream(s.getOutputStream());
        p.println(number);
        temp = c1.nextInt();
        System.out.println(temp);
        in.close();
        s.close();
        c1.close();
    }
}

public class ser {
    public static void main(String args[]) throws IOException{

        ServerSocket s1 = new ServerSocket(1342);
        Socket ss = s1.accept();
        Scanner sc = new Scanner(ss.getInputStream());
        int number = sc.nextInt();

        int temp = number * 2;

        PrintStream p = new PrintStream(ss.getOutputStream());
        p.println(temp);
        ss.close();
        sc.close();
        s1.close();
    }
}

public class ser {
    public static void main(String args[]) throws IOException {
        try (ServerSocket s1 = new ServerSocket(1342);
             Socket ss = s1.accept();
             DataInputStream sc = new DataInputStream(ss.getInputStream());
             DataOutputStream p = new DataOutputStream(ss.getOutputStream());
        ) {
            p.writeInt(sc.readInt() * 2);
        }
    }
}

public class cli {
    public static void main(String args[]) throws IOException {
        try (Scanner in = new Scanner(System.in);
            Socket s = new Socket("127.0.0.1", 1342);
            DataInputStream c1 = new DataInputStream(s.getInputStream());
            DataOutputStream p = new DataOutputStream(s.getOutputStream());
        ){
            System.out.println("Enter any number");
            int number = in.nextInt();

            p.writeInt(number);
            System.out.println(c1.readInt());
        }
    }
}

Enter any number
12
24
服务器：

public class cli {

    public static void main(String args[]) throws UnknownHostException, IOException{
        Scanner in = new Scanner(System.in);
        int number,temp;
        Socket s = new Socket("127.0.0.1", 1342);
        Scanner c1 = new Scanner(s.getInputStream());
        System.out.println("Enter any number");
        number = in.nextInt();
        PrintStream p = new PrintStream(s.getOutputStream());
        p.println(number);
        temp = c1.nextInt();
        System.out.println(temp);
        in.close();
        s.close();
        c1.close();
    }
}

public class ser {
    public static void main(String args[]) throws IOException{

        ServerSocket s1 = new ServerSocket(1342);
        Socket ss = s1.accept();
        Scanner sc = new Scanner(ss.getInputStream());
        int number = sc.nextInt();

        int temp = number * 2;

        PrintStream p = new PrintStream(ss.getOutputStream());
        p.println(temp);
        ss.close();
        sc.close();
        s1.close();
    }
}

public class ser {
    public static void main(String args[]) throws IOException {
        try (ServerSocket s1 = new ServerSocket(1342);
             Socket ss = s1.accept();
             DataInputStream sc = new DataInputStream(ss.getInputStream());
             DataOutputStream p = new DataOutputStream(ss.getOutputStream());
        ) {
            p.writeInt(sc.readInt() * 2);
        }
    }
}

public class cli {
    public static void main(String args[]) throws IOException {
        try (Scanner in = new Scanner(System.in);
            Socket s = new Socket("127.0.0.1", 1342);
            DataInputStream c1 = new DataInputStream(s.getInputStream());
            DataOutputStream p = new DataOutputStream(s.getOutputStream());
        ){
            System.out.println("Enter any number");
            int number = in.nextInt();

            p.writeInt(number);
            System.out.println(c1.readInt());
        }
    }
}

Enter any number
12
24
您应该使用来读取和写入
int
，它比
扫描仪更适合您的情况。还应该考虑使用语句正确关闭资源。

您的代码将更易于阅读和维护，这是避免bug的最佳方法

服务器：


public class cli {

    public static void main(String args[]) throws UnknownHostException, IOException{
        Scanner in = new Scanner(System.in);
        int number,temp;
        Socket s = new Socket("127.0.0.1", 1342);
        Scanner c1 = new Scanner(s.getInputStream());
        System.out.println("Enter any number");
        number = in.nextInt();
        PrintStream p = new PrintStream(s.getOutputStream());
        p.println(number);
        temp = c1.nextInt();
        System.out.println(temp);
        in.close();
        s.close();
        c1.close();
    }
}



public class ser {
    public static void main(String args[]) throws IOException{

        ServerSocket s1 = new ServerSocket(1342);
        Socket ss = s1.accept();
        Scanner sc = new Scanner(ss.getInputStream());
        int number = sc.nextInt();

        int temp = number * 2;

        PrintStream p = new PrintStream(ss.getOutputStream());
        p.println(temp);
        ss.close();
        sc.close();
        s1.close();
    }
}



public class ser {
    public static void main(String args[]) throws IOException {
        try (ServerSocket s1 = new ServerSocket(1342);
             Socket ss = s1.accept();
             DataInputStream sc = new DataInputStream(ss.getInputStream());
             DataOutputStream p = new DataOutputStream(ss.getOutputStream());
        ) {
            p.writeInt(sc.readInt() * 2);
        }
    }
}



public class cli {
    public static void main(String args[]) throws IOException {
        try (Scanner in = new Scanner(System.in);
            Socket s = new Socket("127.0.0.1", 1342);
            DataInputStream c1 = new DataInputStream(s.getInputStream());
            DataOutputStream p = new DataOutputStream(s.getOutputStream());
        ){
            System.out.println("Enter any number");
            int number = in.nextInt();

            p.writeInt(number);
            System.out.println(c1.readInt());
        }
    }
}



Enter any number
12
24


客户端：


public class cli {

    public static void main(String args[]) throws UnknownHostException, IOException{
        Scanner in = new Scanner(System.in);
        int number,temp;
        Socket s = new Socket("127.0.0.1", 1342);
        Scanner c1 = new Scanner(s.getInputStream());
        System.out.println("Enter any number");
        number = in.nextInt();
        PrintStream p = new PrintStream(s.getOutputStream());
        p.println(number);
        temp = c1.nextInt();
        System.out.println(temp);
        in.close();
        s.close();
        c1.close();
    }
}



public class ser {
    public static void main(String args[]) throws IOException{

        ServerSocket s1 = new ServerSocket(1342);
        Socket ss = s1.accept();
        Scanner sc = new Scanner(ss.getInputStream());
        int number = sc.nextInt();

        int temp = number * 2;

        PrintStream p = new PrintStream(ss.getOutputStream());
        p.println(temp);
        ss.close();
        sc.close();
        s1.close();
    }
}



public class ser {
    public static void main(String args[]) throws IOException {
        try (ServerSocket s1 = new ServerSocket(1342);
             Socket ss = s1.accept();
             DataInputStream sc = new DataInputStream(ss.getInputStream());
             DataOutputStream p = new DataOutputStream(ss.getOutputStream());
        ) {
            p.writeInt(sc.readInt() * 2);
        }
    }
}



public class cli {
    public static void main(String args[]) throws IOException {
        try (Scanner in = new Scanner(System.in);
            Socket s = new Socket("127.0.0.1", 1342);
            DataInputStream c1 = new DataInputStream(s.getInputStream());
            DataOutputStream p = new DataOutputStream(s.getOutputStream());
        ){
            System.out.println("Enter any number");
            int number = in.nextInt();

            p.writeInt(number);
            System.out.println(c1.readInt());
        }
    }
}



Enter any number
12
24


输出：


public class cli {

    public static void main(String args[]) throws UnknownHostException, IOException{
        Scanner in = new Scanner(System.in);
        int number,temp;
        Socket s = new Socket("127.0.0.1", 1342);
        Scanner c1 = new Scanner(s.getInputStream());
        System.out.println("Enter any number");
        number = in.nextInt();
        PrintStream p = new PrintStream(s.getOutputStream());
        p.println(number);
        temp = c1.nextInt();
        System.out.println(temp);
        in.close();
        s.close();
        c1.close();
    }
}



public class ser {
    public static void main(String args[]) throws IOException{

        ServerSocket s1 = new ServerSocket(1342);
        Socket ss = s1.accept();
        Scanner sc = new Scanner(ss.getInputStream());
        int number = sc.nextInt();

        int temp = number * 2;

        PrintStream p = new PrintStream(ss.getOutputStream());
        p.println(temp);
        ss.close();
        sc.close();
        s1.close();
    }
}



public class ser {
    public static void main(String args[]) throws IOException {
        try (ServerSocket s1 = new ServerSocket(1342);
             Socket ss = s1.accept();
             DataInputStream sc = new DataInputStream(ss.getInputStream());
             DataOutputStream p = new DataOutputStream(ss.getOutputStream());
        ) {
            p.writeInt(sc.readInt() * 2);
        }
    }
}



public class cli {
    public static void main(String args[]) throws IOException {
        try (Scanner in = new Scanner(System.in);
            Socket s = new Socket("127.0.0.1", 1342);
            DataInputStream c1 = new DataInputStream(s.getInputStream());
            DataOutputStream p = new DataOutputStream(s.getOutputStream());
        ){
            System.out.println("Enter any number");
            int number = in.nextInt();

            p.writeInt(number);
            System.out.println(c1.readInt());
        }
    }
}



Enter any number
12
24



你的问题没有被很好地描述。当你运行它时会发生什么？你说“不让我”是什么意思？你得到的堆栈跟踪是什么。我试过同样的代码，效果很好！