100分求救：关于wait()和notify()的问题，各位大哥请进！

[gull]

我的问题是我想提供一个功能，把ServerThread暂停，我想到了用wait(),可是我用了以后，连主界面都没反映了，大家帮我看看吧！我头发都快急白乐！谢谢！！！！！！！
下面是源程序，是可以直接运行的，大家Copy,paste，运行一下，帮帮忙吧！

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
import java.net.*;
import javax.swing.border.*;

class ClientThread extends Thread{
Socket ClientSocket;
public ClientThread(Socket socket){
ClientSocket=socket;
}
public void run(){
//operations
}
}

class messager{
static void printmsg(String msg){

JOptionPane.showMessageDialog(null,msg,"Message",JOptionPane.INFORMATION_MESSAGE);
}
static void printerr(String msg){
JOptionPane.showMessageDialog(null,msg,"ERROR",JOptionPane.ERROR_MESSAGE);
}
}

class JStatusBar extends JLabel{

private JLabel text=new JLabel();

public final float LEFT=super.LEFT_ALIGNMENT;
public final float RIGHT=super.RIGHT_ALIGNMENT;
public final float CENTER=super.CENTER_ALIGNMENT;

JStatusBar(){
super();
setAlignmentX(LEFT_ALIGNMENT);
setAlignmentY(TOP_ALIGNMENT);
setBorder(new BevelBorder(BevelBorder.LOWERED));
}

public void show(String msg){
setText(msg);
}
public void setAlignment(float pos){
setAlignmentX(pos);
}
}

class Tcpserver{

private static ServerThread server;
//main Frame components
private static JFrame mainFrame=new JFrame();
private static JTextArea textarea=new JTextArea();
private static JScrollPane jsp=new JScrollPane(textarea);
private static JMenuBar menubar=new JMenuBar();
private static JMenu mnuOperations=new JMenu("Operations");
private static JStatusBar statusbar=new JStatusBar();

//Menus
private static JMenuItem mnuStart=new JMenuItem("Start Server");
private static JMenuItem mnuStop=new JMenuItem("Stop Server");
private static JMenuItem mnuSettings=new JMenuItem("Settings");
private static JMenuItem mnuBroadcast=new JMenuItem("Broadcast...");
private static JMenuItem mnuExit=new JMenuItem("Exit");

//Actions for the menu
private static Action actStart=
new AbstractAction("Start Server"){
public void actionPerformed(ActionEvent e){
//operations to start
}
};
private static Action actStop=
new AbstractAction("Stop Server"){
public void actionPerformed(ActionEvent e){
//operations to stop
server.Stop();
}
};

private static Action actSettings=
new AbstractAction("Settings"){
public void actionPerformed(ActionEvent e){
//operations to lauch the settings dialog

}
};

private static Action actExit=
new AbstractAction("Exit"){
public void actionPerformed(ActionEvent e){
//operations to close
mainFrame.dispose();
System.exit(0);
}
};

private static Action actBroadcast=
new AbstractAction("Broadcast..."){
public void actionPerformed(ActionEvent e){
//operations to broadcast msg

}
};

//methods
public static void showMessage(String msg){
textarea.append(msg+"\n");
}
public static void showStatus(String msg){
statusbar.show(msg);
}
public static void clear(){
textarea.setText("");
}
public static void main(String args[]) throws Exception{

//initilize the main frame
mainFrame.setSize(300, 400);
mainFrame.setTitle("Tcpserver");
mainFrame.getContentPane().add(jsp);
mainFrame.getContentPane().add(statusbar,BorderLayout.SOUTH);
menubar.add(mnuOperations);
mainFrame.setJMenuBar(menubar);
mainFrame.setDefaultCloseOperation(mainFrame.EXIT_ON_CLOSE);
mainFrame.setVisible(true);

//setup menu actions
mnuStart.setAction(actStart);
mnuStop.setAction(actStop);
mnuSettings.setAction(actSettings);
mnuBroadcast.setAction(actBroadcast);
mnuExit.setAction(actExit);

//add menu items to menu
mnuOperations.add(mnuStart);
mnuOperations.add(mnuStop);
mnuOperations.addSeparator();
mnuOperations.add(mnuSettings);
mnuOperations.add(mnuBroadcast);
mnuOperations.addSeparator();
mnuOperations.add(mnuExit);

//create a server thread and start to listen
server=new ServerThread();
server.start();
}
}

class ServerThread extends Thread{

private final int PORT=1020;
private ServerSocket LocalServerSocket;

public synchronized void Stop(){
try{
wait();
}
catch(Exception e){
messager.printerr(e.getMessage());
}
}

public void run(){

//setup the server socket and
//waiting for client connections
try{
LocalServerSocket=new ServerSocket(PORT);
Tcpserver.clear();
Tcpserver.showMessage("Server Started.");
Tcpserver.showStatus("Server Started.");
Tcpserver.showMessage("Listening to port:1020...");

//listening to the port
//block if no connection requested

while(true){
//spawn a child thread
new ClientThread(LocalServerSocket.accept());
}
}
catch(IOException ioe){
messager.printerr("IO Exception Detected:"+ioe.getMessage());
messager.printerr("The Application is now terminated.");
System.exit(1);
}
}
}

[Jawan_lee]

太长了，难得看啊

[gull]

copy 到编译器里面运行一下就好了。帮帮忙吧！谢谢！

[popco2]

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[gull]

我现在已经明白我的问题在哪里了！谢谢各位的参与。可是虽然知道了问题在哪里，我还是找不到解决的方法。现在我的问题是，怎样做才能停止一个已经开始accept()的ServerSocket.
比如说
LocalServerSocket.accept();之后当前的线程就被block了，在这个时候，如果我不想再继续
开这个server,我该怎样关闭呢？我曾经试过LocalServerSocket.close(),但是这样会抛出IOException.各位大大，有什么办法吗？谢谢！！！

[buick555]

你可以试一试sleep()

[killjoy]

这个应该很好办吧！你的LocalServerSocket是在主线程吧？
while(true) {
Socket s=LocalServerSocket.accept();
}
你说的你的线程被block后，你不想要这个Server了？你说的是s还是LocalServerSocket？如果是s呀，我就建议你为打开的服务建立一个线程，把这个线程关闭就可以了.

[gull]

我说的是LocalServerSocket,我要关闭的是主线程里的ServerSocket.可是我每次调用LocalServerSocket.close(),就会抛出IO异常。

另外我试了一下sleep（），可是这下连我的主线程也没反映了。大家再帮帮忙吧！

[heifei]

还是用设置标志位关闭吧：
设置class ServerThread extends Thread{
private boolean stoped=false;
.......
public void stop(){stoped=true};//添加方法
public void run(){
try{
LocalServerSocket=new ServerSocket(PORT);
Tcpserver.clear();
......

while(!stoped){//监测标志位
//spawn a child thread
new ClientThread(LocalServerSocket.accept());
}
}
catch(IOException ioe){
messager.printerr("IO Exception Detected:"+ioe.getMessage());
messager.printerr("The Application is now terminated.");
System.exit(1);
}finally{
LocalServerSocket.close();//加入
}
}
这样你就可以在main()里调用ServerSocket.stop()来终止了

[gull]

sorry, I am in school now and here got no IME,so I have to use english.

suppose the program run up to the line:
new ClientThread(LocalServerSocket.accept());
and the thread has been blocked due to the call to accept();
so the program is just stop there and never check the flag, and the flag got no use.
so any other ideas? thanks anyway.

[gull]

finally,I solve it!using close and catch the SocketException.
very happy now. thanks~~~!