關(guān)于java的監(jiān)聽(tīng)器

1、public void addWindowListener(WindowListener l)添加指定的窗口偵聽(tīng)器，以從此窗口接收窗口事件。如果 l 為 null，則不拋出任何異常，且不執(zhí)行任何操作。

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這個(gè)是API中的方法定義，此方法參數(shù)為接口WindowListener，任何實(shí)現(xiàn)該接口的類都可以作為參數(shù)。

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

接收窗口事件的抽象適配器類。此類中的方法為空。此類存在的目的是方便創(chuàng)建偵聽(tīng)器對(duì)象。

擴(kuò)展此類可創(chuàng)建 WindowEvent 偵聽(tīng)器并為所需事件重寫(xiě)該方法。（如果要實(shí)現(xiàn)

WindowListener 接口，則必須定義該接口內(nèi)的所有方法。此抽象類將所有方法都定義為

null，所以只需針對(duì)關(guān)心的事件定義方法。）

使用擴(kuò)展的類可以創(chuàng)建偵聽(tīng)器對(duì)象，然后使用窗口的 addWindowListener

方法向該窗口注冊(cè)偵聽(tīng)器。當(dāng)通過(guò)打開(kāi)、關(guān)閉、激活或停用、圖標(biāo)化或取消圖標(biāo)化而改變了窗口狀態(tài)時(shí)，將調(diào)用該偵聽(tīng)器對(duì)象中的相關(guān)方法，并將

WindowEvent 傳遞給該方法。

3、如果我想在代碼中一次性使用某個(gè)類（抽象類或具體類）或接口，可以使用匿名類的方式，這樣不需自己定義一個(gè)My***類，然后再使用，比較方便。用法就是直接在new WindowAdapter()后面加入類定義，在其中實(shí)現(xiàn)或覆蓋方法就可以了。

匿名類不是返回值，而是相當(dāng)于new String(“hello”)這種的擴(kuò)展形式。我覺(jué)得匿名類的最多用處就是加監(jiān)聽(tīng)器時(shí)。

附上WindowAdapter源代碼：

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代碼監(jiān)聽(tīng)某個(gè)開(kāi)放端口

比如我要監(jiān)聽(tīng)1234這個(gè)端口，代碼如下：

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();

}

}

服務(wù)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的監(jiān)聽(tīng)5038端口的代碼。。。

服務(wù)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("正在監(jiān)聽(tīng)...");

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

System.out.println("接收到一個(gè)請(qǐng)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();

}

}

}

}

客戶端：

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();

}

}

}

}

先開(kāi)服務(wù)端，再開(kāi)客戶端。