Java Socket getLocalSocketAddress() 方法

2025 年 3 月 25 日 | 阅读 2 分钟

Java Socket 类的 getLocalSocketAddress() 方法返回此套接字绑定到的终结点的地址。此方法即使在套接字关闭后仍将继续返回 InetSocketAddress。

语法

参数

不适用

getLocalSocketAddress() 方法返回

代表此套接字本地终结点的 SocketAddress。
如果套接字未绑定，则返回 null。
如果被安全管理器拒绝，则返回回环 SocketAddress。

示例 1

import java.io.IOException;
import java.net.*;
public class JavaSocketGetLocalSocketAddressExample1  {
    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);
        socket.connect(socketAddress);
        //getPort() method will return the port number of this socket
        System.out.println("Local Port number: "+socket.getLocalPort());
        //getLocalSocketAddress() returns the address of the endpoint to which this socket is bound
        System.out.println("Local socket address: "+socket.getLocalSocketAddress());
    }
}

输出

Local Port number: 1085
Local socket address: /127.0.0.1:1085

示例 2

import java.io.IOException;
import java.net.*;
public class JavaSocketGetLocalSocketAddressExample2  {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket();
        //passing null
        InetAddress inetAddress=null;
        //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);
        socket.connect(socketAddress);
        //getPort() method will return the port number of this socket
        System.out.println("Local Port number: "+socket.getLocalPort());
        //getLocalSocketAddress() returns the address of the endpoint to which this socket is bound
        //the default address returns the loopback SocketAddress
        System.out.println("Local socket address: "+socket.getLocalSocketAddress());
    }
}

输出

Local Port number: 1085
Local socket address: /192.168.0.102:1085

示例 3

import java.io.IOException;
import java.net.*;
public class JavaSocketGetLocalSocketAddressExample3  {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket();
        //getLocalSocketAddress() returns the address of the endpoint to which this socket is bound
        //it will return null, as the socket is not bounded
        System.out.println("Local socket address: "+socket.getLocalSocketAddress());
    }
}

输出

Local socket address: null

下一主题Java Socket 类

Java Socket getLocalSocketAddress() 方法

语法

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示例 1

示例 2

示例 3

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Java Socket getLocalSocketAddress() 方法

语法

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示例 1

示例 2

示例 3

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