testjeditorpane.java

疯狂Java讲义_源码(含Java设计模式CHM

import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import java.util.*;
import javax.swing.*;
import javax.swing.event.*;
/**
 * Description:
 * <br/>Copyright (C), 2005-2008, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee [e-mail]
 * @version  1.0
 */
public class TestJEditorPane
{
	JFrame mainWin = new JFrame("测试JEditorPane");
	LinkedList<String> urls = new LinkedList<String>();
	JEditorPane editorPane = new JEditorPane();
	JTextField url = new JTextField(30);
	JCheckBox editable = new JCheckBox();
	JButton backButton = new JButton("后退");

	public void init()
	{ 
		//默认设置不允许编辑
		editorPane.setEditable(false);
		editorPane.addHyperlinkListener(new HyperlinkListener()
		{  
			public void hyperlinkUpdate(HyperlinkEvent event)
			{  
				if (event.getEventType() == HyperlinkEvent.EventType.ACTIVATED)
				{  
					try
					{  
						//将用户浏览过的URL
						urls.push(event.getURL().toString());
						//在文本框内输入URL字符串
						url.setText(event.getURL().toString());
						//让JEditorPane装载新的页面
						editorPane.setPage(event.getURL());
					}
					catch (IOException e)
					{  
						editorPane.setText("出现异常: " + e);
					}
				}
			}
		});

		//为可编辑的复选框添加事件监听器。
		editable.addActionListener(new ActionListener()
		{  
			public void actionPerformed(ActionEvent event)
			{
				//如果该复选框处于选中状态，则该编辑器可编辑
				editorPane.setEditable(editable.isSelected());
			}
		});

		//加载URL指定页面的监听器
		ActionListener listener = new ActionListener()
		{  
			public void actionPerformed(ActionEvent event)
			{  
				try
				{  
					//将用户浏览后的URL添加到URL栈中
					urls.push(url.getText());
					editorPane.setPage(url.getText());
				}
				catch (IOException e)
				{  
					editorPane.setText("页面: " + e);
				}
			}
		};

		JButton loadButton = new JButton("载入");
		loadButton.addActionListener(listener);
		url.addActionListener(listener);

		//为后退按钮添加监听器
		backButton.addActionListener(new ActionListener()
		{  
			public void actionPerformed(ActionEvent event)
			{
				//如果还没有已经浏览过的URL
				if (urls.size() <= 1) return;
				try
				{  
					//取出、并获取最后一个URL
					String urlString = urls.pop();
					url.setText(urlString);
					//重新加载新的URL
					editorPane.setPage(urlString);
				}
				catch (IOException e)
				{  
					editorPane.setText("出现异常: " + e);
				}
			}
		});

		mainWin.add(new JScrollPane(editorPane), BorderLayout.CENTER);

		JPanel panel = new JPanel();
		panel.add(new JLabel("URL"));
		panel.add(url);
		panel.add(loadButton);
		panel.add(backButton);
		panel.add(new JLabel("Editable"));
		panel.add(editable);

		mainWin.add(panel, BorderLayout.NORTH);
		mainWin.pack();
		mainWin.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		mainWin.setVisible(true);
   }

	public static void main(String[] args) 
	{
		new TestJEditorPane().init();
	}
}