Java Socket getPort() 方法

2025 年 3 月 25 日 | 阅读 2 分钟

Java Socket 类的 getPort() 方法返回套接字连接到的远程端口号。即使套接字已关闭，此方法也会返回端口号。

语法

参数

不适用

getPort() 方法要么返回指定套接字连接到的端口号，要么在套接字未连接时返回 0。

示例 1

import java.io.IOException;
import java.net.*;
public class JavaSocketGetPortExample1  {
    public static void main(String[] args) throws IOException {
        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 the inetAddress and port number
        //without binding the socket the connection can not be established
        socket.bind(socketAddress);
        socket.connect(socketAddress);
        //getPort() method will return the port number of this socket
        System.out.println("Port number: "+socket.getPort());
    }
}

输出

Port number: 1085

示例 2

import java.io.IOException;
import java.net.*;
public class JavaSocketGetPortExample2  {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket();
        //getPort() method will return the port number of this socket
        //if the socket is not binded, then 0 is returned as a default port number
        System.out.println("Port number: "+socket.getPort());
    }
}

输出

Port number: 0

示例 3

import java.io.IOException;
import java.net.*;
public class JavaSocketGetPortExample3  {
    public static void main(String[] args) throws IOException {
        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 the inetAddress and port number
        socket.bind(socketAddress);
        //getPort() method will return the port number of this socket
        System.out.println("Port number: "+socket.getPort());
    }
}

输出

Exception in thread "main" java.lang.IllegalArgumentException: port out of range:-1085
	at java.net.InetSocketAddress.checkPort(InetSocketAddress.java:143)
	at java.net.InetSocketAddress.(InetSocketAddress.java:188)
	at com.tpointtech.JavaSocketGetPortExample3.main(JavaSocketGetPortExample3.java:12)

下一主题Java Socket 类

Java Socket getPort() 方法

语法

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示例 1

示例 2

示例 3

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Java Socket getPort() 方法

语法

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示例 1

示例 2

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