监听无线设备JAVA代码 监听事件java

关于java的监听器

1、public void addWindowListener(WindowListener l)添加指定的窗口侦听器,以从此窗口接收窗口事件。如果 l 为 null,则不抛出任何异常,且不执行任何操作。

创新互联公司主营银州网站建设的网络公司,主营网站建设方案,成都app软件开发,银州h5微信小程序搭建,银州网站营销推广欢迎银州等地区企业咨询

这个是API中的方法定义,此方法参数为接口WindowListener,任何实现该接口的类都可以作为参数。

2、public abstract class WindowAdapter implements WindowListener, WindowStateListener, WindowFocusListener

接收窗口事件的抽象适配器类。此类中的方法为空。此类存在的目的是方便创建侦听器对象。

扩展此类可创建 WindowEvent 侦听器并为所需事件重写该方法。(如果要实现

WindowListener 接口,则必须定义该接口内的所有方法。此抽象类将所有方法都定义为

null,所以只需针对关心的事件定义方法。)

使用扩展的类可以创建侦听器对象,然后使用窗口的 addWindowListener

方法向该窗口注册侦听器。当通过打开、关闭、激活或停用、图标化或取消图标化而改变了窗口状态时,将调用该侦听器对象中的相关方法,并将

WindowEvent 传递给该方法。

3、如果我想在代码中一次性使用某个类(抽象类或具体类)或接口,可以使用匿名类的方式,这样不需自己定义一个My***类,然后再使用,比较方便。用法就是直接在new WindowAdapter()后面加入类定义,在其中实现或覆盖方法就可以了。

匿名类不是返回值,而是相当于new String(“hello”)这种的扩展形式。我觉得匿名类的最多用处就是加监听器时。

附上WindowAdapter源代码:

public abstract class WindowAdapter

implements WindowListener, WindowStateListener, WindowFocusListener

{

public void windowOpened(WindowEvent e) {}

public void windowClosing(WindowEvent e) {}

public void windowClosed(WindowEvent e) {}

public void windowIconified(WindowEvent e) {}

public void windowDeiconified(WindowEvent e) {}

public void windowActivated(WindowEvent e) {}

public void windowDeactivated(WindowEvent e) {}

public void windowStateChanged(WindowEvent e) {}

public void windowGainedFocus(WindowEvent e) {}

public void windowLostFocus(WindowEvent e) {}

}

如何用JAVA代码监听某个开放端口

比如我要监听1234这个端口,代码如下:

String ip = "127.0.0.1";

int port = 1234;

try {

Socket socket = new Socket(ip, port);

socket.setSoTimeout(5539900);

java.io.OutputStream out = socket.getOutputStream();

byte[] date = "hello world".getBytes();

out.write(data);

out.flush();

byte[] buffer = new byte[1024];

int len = -1;

java.io.FileOutputStream fout = new java.io.FileOutputStream(

"d:/response.txt");

java.io.ByteArrayOutputStream bout = new java.io.ByteArrayOutputStream();

java.io.InputStream in = socket.getInputStream();

while ((len = in.read(buffer, 0, buffer.length)) 0) {

bout.write(buffer, 0, len);

}

in.close();

bout.flush();

bout.close();

byte[] rdata = bout.toByteArray();

System.out.println(new String(rdata));

fout.write(rdata);

fout.flush();

fout.close();

socket.close();

} catch (UnknownHostException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}

}

服务器端的

ServerSocket ss = new ServerSocket(1234);

Socket socket=null;

BufferedReader in;

PrintWriter out;

while (true) {

socket = ss.accept();

in = new BufferedReader(new InputStreamReader(socket.getInputStream()));

out = new PrintWriter(socket.getOutputStream(),true);

String line = in.readLine();

out.println("you input is :" + line);

out.close();

in.close();

socket.close();

}

求JAVA的监听5038端口的代码。。。

服务端:

package com.socket;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStreamReader;

import java.net.ServerSocket;

import java.net.Socket;

public class Server {

public static void main(String[] args) throws IOException {

ServerSocket server = null;

Socket socket = null;

try {

server = new ServerSocket(5038);

while(true){

System.out.println("正在监听...");

if((socket = server.accept()) != null){

System.out.println("接收到一个请求"+ socket.getRemoteSocketAddress());

new Thread(new OperThread(socket)).start();

}

}

} catch (IOException e) {

System.out.println("waiting");

}

if(!socket.isConnected()){

socket.close();

server.close();

}

}

}

class OperThread implements Runnable{

Socket socket = null;

BufferedReader br = null;

public OperThread(Socket socket) throws IOException {

this.socket = socket;

br = new BufferedReader(new InputStreamReader(socket.getInputStream()));

}

@Override

public void run() {

try {

String s = null;

while( (s = br.readLine()) != null){

System.out.println(s);

}

} catch (IOException e) {

e.printStackTrace();

} finally{

try {

br.close();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

}

客户端:

package com.socket;

import java.io.IOException;

import java.io.OutputStreamWriter;

import java.io.PrintWriter;

import java.net.Socket;

import java.util.Scanner;

public class Client {

public static void main(String[] args) throws IOException {

Socket socket = null;

PrintWriter pw = null;

Scanner scanner = new Scanner(System.in);

try {

socket = new Socket("127.0.0.1",5038);

pw = new PrintWriter(new OutputStreamWriter(socket.getOutputStream()));

String s = null;

while((s = scanner.nextLine()) != null){

pw.println(s);

pw.flush();

}

} catch (Exception e) {

System.out.println("\nconnect error");

}finally{

if(pw != null){

pw.close();

}

try {

if(socket != null){

socket.close();

}

} catch (IOException e) {

e.printStackTrace();

}

}

}

}

先开服务端,再开客户端。


网页题目:监听无线设备JAVA代码 监听事件java
本文来源:http://myzitong.com/article/dopeppg.html