swing 按钮不释放 （线程问题）

代码一：

package org.jivesoftware.pmsaas.business.domain;

import java.awt.BorderLayout;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;

import chrriis.dj.nativeswing.swtimpl.NativeInterface;
/**
 * 该类是包含着浏览器的外框，即启动时候首先出现的是一个swing的框
 * */
public class InternetBrowser{

 /**
  *
  */
 private static final long serialVersionUID = -3160632621097858320L;

 public InternetBrowser(final String url)
 {
  SwingUtilities.invokeLater(new Runnable() {
         public void run() {
             final JFrame frame = new JFrame();
//             frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
             frame.getContentPane().add(new NetBrowser(url),
               BorderLayout.CENTER);

             frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
             frame.setLocationByPlatform(true);
             frame.setAlwaysOnTop(true);
//             frame.setUndecorated(true);
             frame.setSize(675,507);
//             frame.setUndecorated(true);
             frame.setResizable(false);

             frame.addWindowListener(new WindowAdapter(){
             public void windowIconified(WindowEvent e)
                {
             frame.setExtendedState(JFrame.ICONIFIED);
                }
             });
             frame.setVisible(true);

         }
         });
       
         NativeInterface.open();
         NativeInterface.runEventPump();
        
 }
}

 

package org.jivesoftware.pmsaas.business.domain;

import java.awt.BorderLayout;

import javax.swing.JPanel;

import chrriis.dj.nativeswing.swtimpl.components.JWebBrowser;
/**
 * 该类是一个浏览器lei
 * */
public class NetBrowser extends JPanel{

 /**
  *
  */
 private static final long serialVersionUID = -679703553152283868L;

  private JPanel webBrowserPanel;
     private JWebBrowser webBrowser;
     private String url;

     public NetBrowser(String url)
     {
          super(new BorderLayout());
          this.url = url;
          webBrowserPanel = new JPanel(new BorderLayout());
          webBrowser = new JWebBrowser();
          /**
             * native swing 官方API解释
             * navigate
  
  public boolean navigate(String resourceLocation)
  Navigate to a resource, with its location specified as a URL or path.
  Parameters:
  resourceLocation - the URL or path.
  Returns:
  true if the navigation was successful.
           * */
          webBrowser.navigate(url);
          webBrowser.setButtonBarVisible(false);
          webBrowser.setMenuBarVisible(true);
          webBrowser.setBarsVisible(false);
          webBrowser.setStatusBarVisible(false);
          //webBrowserPanel与webBrowser互相包含
          webBrowserPanel.add(webBrowser, BorderLayout.CENTER);
          add(webBrowserPanel, BorderLayout.CENTER);
     }
}

 

出现问题代码：

private JPanel getJPanel(){
        // Get Workspace UI from SparkManager
      
       // Add own Tab.
       JPanel imgPanel=new JPanel();
       imgPanel.setLayout(new GridLayout(3,3,20,20));
      
        ib1=new RolloverButton(BusinessPluginRes.getString(BusinessPluginRes.ESTATERES_STR),BusinessPluginRes.getImageIcon(BusinessPluginRes.ESTATERES));
        ib2=new RolloverButton(BusinessPluginRes.getString(BusinessPluginRes.FEEMG_STR),BusinessPluginRes.getImageIcon(BusinessPluginRes.FEEMG));
        ib3=new RolloverButton(BusinessPluginRes.getString(BusinessPluginRes.FEEPJ_STR),BusinessPluginRes.getImageIcon(BusinessPluginRes.FEEPJ));
        ib4=new RolloverButton(BusinessPluginRes.getString(BusinessPluginRes.FEEST_STR),BusinessPluginRes.getImageIcon(BusinessPluginRes.FEEST));
        ib5=new RolloverButton(BusinessPluginRes.getString(BusinessPluginRes.FEETB_STR),BusinessPluginRes.getImageIcon(BusinessPluginRes.FEETB));
        ib6=new RolloverButton(BusinessPluginRes.getString(BusinessPluginRes.NOTE_STR),BusinessPluginRes.getImageIcon(BusinessPluginRes.NOTE));
        ib7=new RolloverButton(BusinessPluginRes.getString(BusinessPluginRes.RATECH_STR),BusinessPluginRes.getImageIcon(BusinessPluginRes.RATECH));
        ib8=new RolloverButton(BusinessPluginRes.getString(BusinessPluginRes.TABLEMG_STR),BusinessPluginRes.getImageIcon(BusinessPluginRes.TABLEMG));
        ib9=new RolloverButton(BusinessPluginRes.getString(BusinessPluginRes.TABLEST_STR),BusinessPluginRes.getImageIcon(BusinessPluginRes.TABLEST));
       /**
        * 
        * */
       ib1.addActionListener(new ActionListener() {
  
  @Override
  public void actionPerformed(ActionEvent e) {
        
          // TODO Auto-generated method stub
      new InternetBrowser("http://www.baidu.com");
        
  }
 });

 

出现的问题是： 按钮ib1 按下去之后无法释放 之后就无法产生浏览器窗口new InternetBrowser("http://www.baidu.com");

 

出现问题原因： 主线程上无法执行新的一个线程new InternetBrowser("http://www.baidu.com"); 线程里不会再产生线程。

因此解决办法：

参照 http://blog.csdn.net/bzwm/article/details/3895381#comments 

摘抄如下

---------------------------------------------------------------------------------------------------------------

现在我们要做一个简单的界面。

包括一个进度条、一个输入框、开始和停止按钮。

需要实现的功能是：

当点击开始按钮，则更新进度条，并且在输入框内把完成的百分比输出(这里只做例子，没有真正去做某个工作)。

 

代码1：

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JProgressBar;
import javax.swing.JTextField;
public class SwingThreadTest1 extends JFrame {
private static final long serialVersionUID = 1L;
private static final String STR = "Completed : ";
private JProgressBar progressBar = new JProgressBar();
private JTextField text = new JTextField(10);
private JButton start = new JButton("Start");
private JButton end = new JButton("End");
private boolean flag = false;
private int count = 0;
public SwingThreadTest1() {
this.setLayout(new FlowLayout());
add(progressBar);
text.setEditable(false);
add(text);
add(start);
add(end);
start.addActionListener(new Start());
end.addActionListener(new End());
}

private void go() {
while (count < 100) {
try {
Thread.sleep(100);//这里比作要完成的某个耗时的工作
} catch (InterruptedException e) {
e.printStackTrace();
}
//更新进度条和输入框
if (flag) {
count++;
progressBar.setValue(count);
text.setText(STR + String.valueOf(count) + "%");
}
}
}
private class Start implements ActionListener {
public void actionPerformed(ActionEvent e) {
flag = true;//设置开始更新的标志
go();//开始工作
}
}
private class End implements ActionListener {
public void actionPerformed(ActionEvent e) {
flag = false;//停止
}
}
public static void main(String[] args) {
SwingThreadTest1 fg = new SwingThreadTest1();
fg.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
fg.setSize(300, 100);
fg.setVisible(true);
}
}

import java.awt.FlowLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JProgressBar; import javax.swing.JTextField; public class SwingThreadTest1 extends JFrame { private static final long serialVersionUID = 1L; private static final String STR = "Completed : "; private JProgressBar progressBar = new JProgressBar(); private JTextField text = new JTextField(10); private JButton start = new JButton("Start"); private JButton end = new JButton("End"); private boolean flag = false; private int count = 0; public SwingThreadTest1() { this.setLayout(new FlowLayout()); add(progressBar); text.setEditable(false); add(text); add(start); add(end); start.addActionListener(new Start()); end.addActionListener(new End()); } private void go() { while (count < 100) { try { Thread.sleep(100);//这里比作要完成的某个耗时的工作 } catch (InterruptedException e) { e.printStackTrace(); } //更新进度条和输入框 if (flag) { count++; progressBar.setValue(count); text.setText(STR + String.valueOf(count) + "%"); } } } private class Start implements ActionListener { public void actionPerformed(ActionEvent e) { flag = true;//设置开始更新的标志 go();//开始工作 } } private class End implements ActionListener { public void actionPerformed(ActionEvent e) { flag = false;//停止 } } public static void main(String[] args) { SwingThreadTest1 fg = new SwingThreadTest1(); fg.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); fg.setSize(300, 100); fg.setVisible(true); } }

 

 

运行代码发现，

现象1：当点击了开始按钮，画面就卡住了。按钮不能点击，进度条没有被更新，输入框上也没有任何信息。

原因分析：Swing是线程不安全的，是单线程的设计，所以只能从事件派发线程访问将要在屏幕上绘制的Swing组件。ActionListener的actionPerformed方法是在事件派发线程中调用执行的，而点击了开始按钮后，执行了go()方法，在go()里，虽然也去执行了更新组件的方法

progressBar.setValue(count);

text.setText(STR + String.valueOf(count) + "%");

但由于go()方法直到循环结束，它并没有返回，所以更新组件的操作一直没有被执行，这就造成了画面卡住的现象。

现象2：过了一段时间(go方法里的循环结束了)后，画面又可以操作，并且进度条被更新，输入框也出现了我们想看到的信息。

原因分析：通过在现象1的分析，很容易联想到，当go()方法返回了，则其他的线程(更新组件)可以被派发了，所以画面上的组件被更新了。

 

 

为了让画面不会卡住，我们来修改代码，将耗时的工作放在一个线程里去做。

 

代码2：

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JProgressBar;
import javax.swing.JTextField;
public class SwingThreadTest2 extends JFrame {
private static final long serialVersionUID = 1L;
private static final String STR = "Completed : ";
private JProgressBar progressBar = new JProgressBar();
private JTextField text = new JTextField(10);
private JButton start = new JButton("Start");
private JButton end = new JButton("End");
private boolean flag = false;
private int count = 0;

GoThread t = null;
public SwingThreadTest2() {
this.setLayout(new FlowLayout());
add(progressBar);
text.setEditable(false);
add(text);
add(start);
add(end);
start.addActionListener(new Start());
end.addActionListener(new End());
}
private void go() {
while (count < 100) {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
if (flag) {
count++;
System.out.println(count);
progressBar.setValue(count);
text.setText(STR + String.valueOf(count) + "%");
}
}
}
private class Start implements ActionListener {
public void actionPerformed(ActionEvent e) {
flag = true;
if(t == null){
t = new GoThread();
t.start();
}
}
}
//执行复杂工作，然后更新组件的线程
class GoThread extends Thread{
public void run() {
//do something...
go();
}
}
private class End implements ActionListener {
public void actionPerformed(ActionEvent e) {
flag = false;
}
}
public static void main(String[] args) {
SwingThreadTest2 fg = new SwingThreadTest2();
fg.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
fg.setSize(300, 100);
fg.setVisible(true);
}
}

import java.awt.FlowLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JProgressBar; import javax.swing.JTextField; public class SwingThreadTest2 extends JFrame { private static final long serialVersionUID = 1L; private static final String STR = "Completed : "; private JProgressBar progressBar = new JProgressBar(); private JTextField text = new JTextField(10); private JButton start = new JButton("Start"); private JButton end = new JButton("End"); private boolean flag = false; private int count = 0; GoThread t = null; public SwingThreadTest2() { this.setLayout(new FlowLayout()); add(progressBar); text.setEditable(false); add(text); add(start); add(end); start.addActionListener(new Start()); end.addActionListener(new End()); } private void go() { while (count < 100) { try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } if (flag) { count++; System.out.println(count); progressBar.setValue(count); text.setText(STR + String.valueOf(count) + "%"); } } } private class Start implements ActionListener { public void actionPerformed(ActionEvent e) { flag = true; if(t == null){ t = new GoThread(); t.start(); } } } //执行复杂工作，然后更新组件的线程 class GoThread extends Thread{ public void run() { //do something... go(); } } private class End implements ActionListener { public void actionPerformed(ActionEvent e) { flag = false; } } public static void main(String[] args) { SwingThreadTest2 fg = new SwingThreadTest2(); fg.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); fg.setSize(300, 100); fg.setVisible(true); } }

 

 

我们执行了程序，结果和我们想要的一样，画面不会卡住了。

那这个程序是否没有问题了呢？

我们自定义了一个线程GoThread，在这里我们完成了那些耗时的工作，可以看作是“工作线程”，

而对于组件的更新，我们也放在了“工作线程”里完成了。

在这里，在事件派发线程以外的线程里设置进度条，是一个危险的操作，运行是不正常的。（对于输入框组件的更新是安全的。）

 

只有从事件派发线程才能更新组件，根据这个原则，我们来修改我们现有代码。

 

代码3：

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JProgressBar;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
public class SwingThreadTest3 extends JFrame {
private static final long serialVersionUID = 1L;
private static final String STR = "Completed : ";
private JProgressBar progressBar = new JProgressBar();
private JTextField text = new JTextField(10);
private JButton start = new JButton("Start");
private JButton end = new JButton("End");
private boolean flag = false;
private int count = 0;

private GoThread t = null;

private Runnable run = null;//更新组件的线程
public SwingThreadTest3() {
this.setLayout(new FlowLayout());
add(progressBar);
text.setEditable(false);
add(text);
add(start);
add(end);
start.addActionListener(new Start());
end.addActionListener(new End());

run = new Runnable(){//实例化更新组件的线程
public void run() {
progressBar.setValue(count);
text.setText(STR + String.valueOf(count) + "%");
}
};
}
private void go() {
while (count < 100) {
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
if (flag) {
count++;
SwingUtilities.invokeLater(run);//将对象排到事件派发线程的队列中
}
}
}
private class Start implements ActionListener {
public void actionPerformed(ActionEvent e) {
flag = true;
if(t == null){
t = new GoThread();
t.start();
}
}
}

class GoThread extends Thread{
public void run() {
//do something...
go();
}
}
private class End implements ActionListener {
public void actionPerformed(ActionEvent e) {
flag = false;
}
}
public static void main(String[] args) {
SwingThreadTest3 fg = new SwingThreadTest3();
fg.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
fg.setSize(300, 100);
fg.setVisible(true);
}
}

import java.awt.FlowLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JProgressBar; import javax.swing.JTextField; import javax.swing.SwingUtilities; public class SwingThreadTest3 extends JFrame { private static final long serialVersionUID = 1L; private static final String STR = "Completed : "; private JProgressBar progressBar = new JProgressBar(); private JTextField text = new JTextField(10); private JButton start = new JButton("Start"); private JButton end = new JButton("End"); private boolean flag = false; private int count = 0; private GoThread t = null; private Runnable run = null;//更新组件的线程 public SwingThreadTest3() { this.setLayout(new FlowLayout()); add(progressBar); text.setEditable(false); add(text); add(start); add(end); start.addActionListener(new Start()); end.addActionListener(new End()); run = new Runnable(){//实例化更新组件的线程 public void run() { progressBar.setValue(count); text.setText(STR + String.valueOf(count) + "%"); } }; } private void go() { while (count < 100) { try { Thread.sleep(100); } catch (InterruptedException e) { e.printStackTrace(); } if (flag) { count++; SwingUtilities.invokeLater(run);//将对象排到事件派发线程的队列中 } } } private class Start implements ActionListener { public void actionPerformed(ActionEvent e) { flag = true; if(t == null){ t = new GoThread(); t.start(); } } } class GoThread extends Thread{ public void run() { //do something... go(); } } private class End implements ActionListener { public void actionPerformed(ActionEvent e) { flag = false; } } public static void main(String[] args) { SwingThreadTest3 fg = new SwingThreadTest3(); fg.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); fg.setSize(300, 100); fg.setVisible(true); } }

 

 

解释：SwingUtilities.invokeLater()方法使事件派发线程上的可运行对象排队。当可运行对象排在事件派发队列的队首时，就调用其run方法。其效果是允许事件派发线程调用另一个线程中的任意一个代码块。

还有一个方法SwingUtilities.invokeAndWait()方法，它也可以使事件派发线程上的可运行对象排队。

他们的不同之处在于：SwingUtilities.invokeLater()在把可运行的对象放入队列后就返回，而SwingUtilities.invokeAndWait()一直等待知道已启动了可运行的run方法才返回。如果一个操作在另外一个操作执行之前必须从一个组件获得信息，则应使用SwingUtilities.invokeAndWait()方法。

 

--------------------------------------------------------------------------------------------

我的对应的解决办法是： 在要生成对象的地方，制造一个独立的线程来执行生成new InternetBrowser("http://www.baidu.com");的操作

解决问题的代码：

ib1.addActionListener(new ActionListener() {
  
  @Override
  public void actionPerformed(ActionEvent e) {
   if(t==null){
    t=new Thread(new Runnable() {
     
     @Override
     public void run() {
      // TODO Auto-generated method stub
      new InternetBrowser("http://www.baidu.com");
     }
    });
    t.start();
   }
  }
 });