Java Socket setKeepAlive() 方法

2025 年 3 月 25 日 | 阅读 2 分钟

Java Socket 类的 setKeepAlive() 方法在成功关闭 Socket 连接的写半部分时返回布尔值 'true'，否则返回 false。

语法

参数

参数 'on' 表示是否启用套接字。

不适用

抛出

SocketException - 如果底层协议（如 TCP 错误）存在错误。

示例 1

import java.io.IOException;
import java.net.*;
public class JavaSocketSetKeepAliveExample1  {
    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 JavaSocketSetKeepAliveExample2  {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket();
        boolean on=false;
        //setKeepAlive() enables or disables the SO_KEEPALIVE option
        socket.setKeepAlive(on);
        //getKeepAlive() returns  a boolean indicating whether SO_KEEPALIVE option is enabled or not
        //by default the getKeepAlive value returns false
        if(socket.getKeepAlive()){
            System.out.println("SO_KEEPALIVE is enabled...");
        }
        else{
            System.out.println("SO_KEEPALIVE is not enabled");
        }
    }
}

输出

SO_KEEPALIVE is not enabled...

示例 3

import java.io.IOException;
import java.net.*;
public class JavaSocketSetKeepAliveExample3  {
    public static void main(String[] args) throws IOException {
        Socket socket = new Socket();
        boolean on=false;
        //closing the socket
        socket.close();
        //setKeepAlive() enables or disables the SO_KEEPALIVE option
        //it will return an exception, as the socket is already closed
        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

Exception in thread "main" java.net.SocketException: Socket is closed
	at java.net.Socket.setKeepAlive(Socket.java:1309)
	at com.tpointtech.JavaSocketSetKeepAliveExample3.main(JavaSocketSetKeepAliveExample3.java:13)

下一主题Java Socket 类

Java Socket setKeepAlive() 方法

语法

参数

返回

抛出

示例 1

示例 2

示例 3

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Java Socket setKeepAlive() 方法

语法

参数

返回

抛出

示例 1

示例 2

示例 3

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