Java Socket isConnected() 方法

2025 年 3 月 25 日 | 阅读 2 分钟

Java Socket 类的 isConnected() 方法返回套接字的连接状态。该方法将继续返回关闭之前的连接状态。

语法

参数

不适用

如果套接字已成功连接到服务器，isConnected() 方法将返回布尔值“true”。

示例 1

import java.io.IOException;
import java.net.*;
public class JavaSocketIsConnectedExample1  {
    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);
        //isConnected() method returns the connected state of the socket
        System.out.println("The socket is connected: "+socket.isConnected());
        //isBound() method returns the binding state of the socket
        System.out.println("The socket is bounded: "+socket.isBound());
    }
}

输出

The socket is connected: true
The socket is bounded: true

示例 2

import java.io.IOException;
import java.net.*;
public class JavaSocketIsConnectedExample2  {
    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);
        //socket is closed
        socket.close();
        //isConnected() method returns the connected state of the socket
        //It will continue to return the connection state that was prior to being closed.
        System.out.println("The Socket is connected: "+socket.isConnected());
        //isBound() method returns the binding state of the socket
        System.out.println("The socket is bounded: "+socket.isBound());
    }
}

输出

The Socket is connected: true
The socket is bounded: true

下一主题Java Socket 类

Java Socket isConnected() 方法

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Java Socket isConnected() 方法

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