Java Socket getRemoteSocketAddress() 方法

2025 年 3 月 25 日 | 阅读 2 分钟

Java Socket 类的 getRemoteSocketAddress () 方法在套接字连接时返回该套接字终结点的地址，否则如果套接字未连接则返回 null。

语法

参数

不适用

getRemoteSocketAddress () 方法在套接字已连接时返回表示套接字远程终结点的 SocketAddress，否则如果套接字未连接则返回 null。

示例 1

import java.io.IOException;
import java.net.*;
public class JavaSocketGetRemoteSocketAddressExample1  {
    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());
        //getRemoteSocketAddress() returns returns the address of the endpoint of the specified socket if it is connected
        System.out.println("Remote socket address: "+socket.getRemoteSocketAddress());
    }
}

输出

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

示例 2

import java.io.IOException;
import java.net.*;
public class JavaSocketGetRemoteSocketAddressExample2  {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket();
        //getRemoteSocketAddress() returns returns the address of the endpoint of the specified socket
        //it returns null, if it is not connected
        System.out.println("Remote socket address: "+socket.getRemoteSocketAddress());
    }
}

输出

Remote socket address: null

示例 3

import java.io.IOException;
import java.net.*;
public class JavaSocketGetRemoteSocketAddressExample3  {
    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);
        //the connection will not establish without binding the socket with bind() method
        socket.connect(socketAddress);
        //getPort() method will return the port number of this socket
        System.out.println("Local Port number: "+socket.getLocalPort());
        //getRemoteSocketAddress() returns the address of the endpoint of the specified socket if the socket is connected
        System.out.println("Remote socket address: "+socket.getRemoteSocketAddress());
    }
}

输出

Exception in thread "main" java.net.ConnectException: Connection refused: connect
	at java.net.DualStackPlainSocketImpl.connect0(Native Method)
	at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:79)
	at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
	at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
	at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
	at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
	at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
	at java.net.Socket.connect(Socket.java:589)
	at java.net.Socket.connect(Socket.java:538)
	at com.tpointtech. JavaSocketGetRemoteSocketAddressExample3.main(
	JavaSocketGetRemoteSocketAddressExample3.java:15)

下一主题Java Socket 类

Java Socket getRemoteSocketAddress() 方法

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Java Socket getRemoteSocketAddress() 方法

语法

参数

返回

示例 1

示例 2

示例 3

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