ChatHandler.java
package?pro4;
import?java.net.*;
import?java.io.*;
import?java.util.*;
public?class?ChatHandler?implements?Runnable{
????protected?Socket?socket;
????protected?ObjectInputStream?dataIn;
????protected?ObjectOutputStream?dataOut;
????protected?Thread?listener;
????protected?static?Vector?handlers=new?Vector();
?????
????private?boolean?keepListening=true;
????public?ChatHandler(Socket?socket){
????????this.socket=socket;
????}
????public?synchronized?void?start(){
????????if(listener==null){
????????????try{
????????????????dataIn=new?ObjectInputStream(socket.getInputStream());
????????????????dataOut=new?ObjectOutputStream(socket.getOutputStream());
????????????????listener=new?Thread(this);
????????????????listener.start();
????????????}catch(IOException?ioException){
????????????????ioException.printStackTrace();
????????????}
????????}
????}
????public?synchronized?void?stop(){
????????if(listener!=null){
????????????try{
????????????????if(listener!=Thread.currentThread())
????????????????????listener.interrupt();
????????????????listener=null;
????????????????dataOut.close();
????????????????socket.close();
????????????}catch(IOException?ignored){
?????????????????
????????????}
????????}
????}
????public?void?run(){
????????String?message="";
????????try{
????????????handlers.addElement(this);
????????????while(keepListening){
????????????????message=(String)dataIn.readObject();
????????????????if(message.equals("DISCONNECT")){
????????????????????dataOut.writeObject(message);
????????????????????dataOut.flush();
????????????????????stopListening();
????????????????}else
????????????????????broadcast(message);
????????????}
????????}catch(ClassNotFoundException?classNotFoundException){
?????????????
????????}catch(EOFException?ignored){
?????????????
????????}catch(IOException?ex){
????????????if(listener==Thread.currentThread())
????????????????ex.printStackTrace();
????????}finally{
????????????handlers.removeElement(this);
????????}
????????try{
????????????dataIn.close();
????????}catch(IOException?ioException){
????????????ioException.printStackTrace();
????????}
????????stop();
????}
????protected?void?broadcast(String?message){
????????synchronized?(handlers){
????????????Enumeration?enumer=handlers.elements();
????????????while(enumer.hasMoreElements()){
????????????????ChatHandler?handler=(ChatHandler)enumer.nextElement();
????????????????try{
????????????????????handler.dataOut.writeObject(message);
????????????????????handler.dataOut.flush();
????????????????}catch(IOException?ex){
????????????????????handler.stop();
????????????????}??????????????
????????????}
????????}
????}
????public?void?stopListening(){
????????keepListening=false;
????}
}
可以解釋一下run（）方法和broadcast（）方法嗎？看不懂，，，
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