Java Socket getKeepAlive() 方法

2025 年 3 月 25 日 | 阅读 2 分钟

Java Socket 类的 getKeepAlive() 方法用于测试 SO_KEEPALIVE 选项是否已启用。

语法

参数

不适用

getKeepAlive() 方法返回一个布尔值，指示 SO_KEEPALIVE 选项是否已启用。

抛出

SocketException - 如果底层协议出现错误，例如 TCP 错误。

示例 1

import java.io.IOException;
import java.net.*;
public class JavaSocketGetKeepAliveExample1  {
    public static void main(String[] args) throws IOException {
      Socket socket = new Socket();
      //enabling the boolean value true
      boolean on=true;
      //setKeepAlive() method either enables or disables the SO_KEEPALIVE option
      socket.setKeepAlive(on);
      //getKeepAlive() returns  a boolean indicating whether SO_KEEPALIVE option is enabled or not
      System.out.println("SO_KEEPALIVE is enabled: "+socket.getKeepAlive());
    }
}

输出

SO_KEEPALIVE is enabled: true

示例 2

import java.io.IOException;
import java.net.*;
public class JavaSocketGetKeepAliveExample2  {
    public static void main(String[] args) throws IOException {
      Socket socket = new Socket();
      //getKeepAlive() returns  a boolean indicating whether SO_KEEPALIVE option is enabled or not
      //by default the getKeepAlive value returns false
      System.out.println("SO_KEEPALIVE is enabled: "+socket.getKeepAlive());
    }
}

输出

SO_KEEPALIVE is enabled: false

示例 3

import java.io.IOException;
import java.net.*;
public class JavaSocketGetKeepAliveExample3  {
    public static void main(String[] args) throws IOException {
      Socket socket = new Socket();
      //closing the socket
      socket.close();
      //getKeepAlive() returns  a boolean indicating whether SO_KEEPALIVE option is enabled or not
      //it will return an exception, as the socket is already closed
      System.out.println("SO_KEEPALIVE is enabled: "+socket.getKeepAlive());
    }
}

输出

Exception in thread "main" java.net.SocketException: Socket is closed
	at java.net.Socket.getKeepAlive(Socket.java:1325)
	at com.tpointtech.JavaSocketGetKeepAliveExample3.main(JavaSocketGetKeepAliveExample3.java:11)

下一主题Java Socket 类

Java Socket getKeepAlive() 方法

语法

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返回

抛出

示例 1

示例 2

示例 3

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Java Socket getKeepAlive() 方法

语法

参数

返回

抛出

示例 1

示例 2

示例 3

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