Java Socket sendUrgentData() 方法

2025 年 3 月 25 日 | 阅读 2 分钟

Java Socket 类的 sendUrgentData() 方法用于在套接字上发送一个字节的紧急数据。该字节应为 data 参数的最低八位。

语法

参数

“data” 参数表示要发送的数据字节。

不适用

抛出

IOException - 如果在发送数据时发生错误。

示例 1

import java.io.IOException;
import java.net.*;
public class JavaSocketSendUrgentDataExample1  {
    public static void main(String[] args) throws IOException {
        //calling the constructor of the socket class
        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 inetAddress and port
        socket.bind(socketAddress);
        //the connection will not establish without binding the socket with bind() method
        socket.connect(socketAddress);
        //isConnected() method returns the connected state of the socket
        System.out.println("The socket is connected: "+socket.isConnected());
        //isBound() method returns the binding state of the socket
        int data=90;
        //sendUrgentData() method sends one byte of urgent data on the socket.
        socket.sendUrgentData(data);
        System.out.println("Data has been sent successfully...");

    }
}

输出

The socket is connected: true
Data has been sent successfully...

示例 2

import java.io.IOException;
import java.net.*;
public class JavaSocketSendUrgentDataExample2  {
    public static void main(String[] args) throws IOException {
        //calling the constructor of the socket class
        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 inetAddress and port
        socket.bind(socketAddress);
        //the connection will not establish without binding the socket with bind() method
        socket.connect(socketAddress);
        //isConnected() method returns the connected state of the socket
        System.out.println("The socket is connected: "+socket.isConnected());
        //closing the socket
        socket.close();
        int data=0;
        //sendUrgentData() method sends one byte of urgent data on the socket.
        socket.sendUrgentData(data);
        //it will throw an IOException, as the socket is closed
        System.out.println("Data has been send successfully...");
    }
}

输出

Exception in thread "main" java.io.IOException: Socket Closed
The socket is connected: true
	at java.net.AbstractPlainSocketImpl.sendUrgentData(AbstractPlainSocketImpl.java:591)
	at java.net.PlainSocketImpl.sendUrgentData(PlainSocketImpl.java:262)
	at java.net.Socket.sendUrgentData(Socket.java:1067)
	at com.tpointtech.JavaSocketSendUrgentDataExample2.main(JavaSocketSendUrgentDataExample2.java:23)

示例 3

import java.io.IOException;
import java.net.*;
public class JavaSocketSendUrgentDataExample3  {
    public static void main(String[] args) throws IOException {
        //calling the constructor of the socket class
        Socket socket = new Socket();
        //isConnected() method returns the connected state of the socket
        System.out.println("The socket is connected: "+socket.isConnected());
        //closing the socket
        if (socket.isConnected()) {
            int data = 0;
            //sendUrgentData() method sends one byte of urgent data on the socket.
            socket.sendUrgentData(data);
            //it will throw an SocketException, as the socket is not connected
            System.out.println("Data has been send successfully...");
        }
        else{
            System.out.println("Socket is not connected...");
            System.out.println("Please connect the socket with a valid socket address and port number");
        }
    }
}

输出

The socket is connected: false
Socket is not connected...
Please connect the socket with a valid socket address and port number

下一主题Java Socket 类

Java Socket sendUrgentData() 方法

语法

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返回

抛出

示例 1

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示例 3

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Java Socket sendUrgentData() 方法

语法

参数

返回

抛出

示例 1

示例 2

示例 3

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