Java Socket isBound() 方法

2025 年 3 月 25 日 | 阅读 2 分钟

Java Socket 类的 isBound() 方法返回一个布尔值，表示套接字的绑定状态。如果套接字在关闭之前已经绑定，那么即使套接字已关闭，此方法也会继续返回“true”。

语法

参数

不适用

如果套接字已成功绑定到某个地址，isBound() 方法将返回布尔值“true”。

示例 1

import java.io.IOException;
import java.net.*;
public class JavaSocketIsBoundExample1  {
    public static void main(String[] args) throws IOException {
        //calling the constructor of the socket class
        Socket socket = new Socket();
        InetAddress inetAddress=InetAddress.getByName("localhost");
        //the port should be greater or equal to 0, else it will throw an error
        int port=1085;
        //calling the constructor of the SocketAddress class
        SocketAddress socketAddress=new InetSocketAddress(inetAddress, port);
        //binding the socket with inetAddress and port
        socket.bind(socketAddress);
        //the connection will not establish without binding the socket with bind() method
        socket.connect(socketAddress);
        //isBound() method returns a boolean value if the socket is bounded
        System.out.println("The Socket is bounded: "+socket.isBound());
    }
}

输出

The Socket is bounded: true

示例 2

import java.io.IOException;
import java.net.*;
public class JavaSocketIsBoundExample2  {
    public static void main(String[] args) throws IOException {
        //calling the constructor of the socket class
        Socket socket = new Socket();
        //isBound() method returns a boolean value if the socket is bounded
        //by default the isBound() method returns false
        System.out.println("The Socket is bounded: "+socket.isBound());
    }
}

输出

The Socket is bounded:  false

示例 3

import java.io.IOException;
import java.net.*;
public class JavaSocketIsBoundExample3  {
    public static void main(String[] args) throws IOException {
        //calling the constructor of the socket class
        Socket socket = new Socket();
        InetAddress inetAddress=InetAddress.getByName("localhost");
        //the port should be greater or equal to 0, else it will throw an error
        int port=1085;
        //calling the constructor of the SocketAddress class
        SocketAddress socketAddress=new InetSocketAddress(inetAddress, port);
        //binding the socket with inetAddress and port
        socket.bind(socketAddress);
        //the connection will not establish without binding the socket with bind() method
        socket.connect(socketAddress);
        //closing the socket
        socket.close();
        //The isBound() will continue to return the boolean value 'true' that was prior before closing the socket
        System.out.println("The Socket is bounded: "+socket.isBound());
    }
}

输出

The Socket is bounded:  true

下一主题Java Socket 类

Java Socket isBound() 方法

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Java Socket isBound() 方法

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