swing JTextArea

最近 小研究了一哈 java swing 这东西,感觉java在这方面还是不错

 

此小节 JTextArea  实现了copy和past   用到了几个方法 

 

首先为了以后方便做了一个启动类(很简单的一个东西)

public class DoMain {
	public static void main(String[] a){
		SwingUtilities.invokeLater(new Runnable() {
			public void run() {
				JTextAreaTest tb = new JTextAreaTest();//以后直接把此行替换就行了
				tb.setLocationRelativeTo(null);
				tb.setVisible(true);
			}
		});
	}
}

 JTextAreaTest 类:

@SuppressWarnings("serial")
public class JTextAreaTest extends javax.swing.JFrame {
	private JMenuBar jMenuBar1;
	private JMenuItem mucopy;
	private JMenuItem mupast;
	private JScrollPane jsp;
	private JTextArea jta;
	private JMenu jMenu1;
	public JTextAreaTest() {
		super();
		initGUI();
	}
	private void initGUI() {
		try {
			setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
			{
				jsp = new JScrollPane();
				getContentPane().add(jsp, BorderLayout.CENTER);
				{
					jta = new JTextArea();
					jsp.setViewportView(jta);
				}
			}
			{
				jMenuBar1 = new JMenuBar();
				setJMenuBar(jMenuBar1);
				{
					jMenu1 = new JMenu();
					jMenuBar1.add(jMenu1);
					jMenu1.setText("\u7f16\u8f91");
					{
						mucopy = new JMenuItem();
						jMenu1.add(mucopy);
						mucopy.setText("\u590d\u5236");
					}
					{
						mupast = new JMenuItem();
						jMenu1.add(mupast);
						mupast.setText("\u7c98\u8d34");
						mupast.setEnabled(false);
					}
					mucopy.addActionListener(new ActionListener() {
						@Override
						public void actionPerformed(ActionEvent e) {
							ActionListenerTest ap = new ActionListenerTest();
							mupast.setEnabled(ap.copy(e, jta.getText()));
						}
					});
					mupast.addActionListener(new ActionListener() {
						@Override
						public void actionPerformed(ActionEvent e) {
							ActionListenerTest ap = new ActionListenerTest();
							jta.replaceRange(ap.past(e),jta.getSelectionStart(),jta.getSelectionEnd());
						//	jta.setText(jta.getText()+ap.past(e));
						}
					});
				}
			}
			
			
			pack();
			this.setSize(546, 359);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

}

 

把actionlistener 的方法都写到例外一个类里面了 大体上让主体上代码好看些

public class ActionListenerTest  {

	public String past(ActionEvent e) {
		Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
		if(clipboard.isDataFlavorAvailable(DataFlavor.stringFlavor)){
			try {
				String content = (String)clipboard.getData(DataFlavor.stringFlavor);
				return content;
				
			} catch (UnsupportedFlavorException e1) {
				e1.printStackTrace();
			} catch (IOException e1) {
				e1.printStackTrace();
			}
		}
		return "copy";
	}
	public boolean copy(ActionEvent e,String content) {
		StringSelection contents = new StringSelection(content);
		Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
		clipboard.setContents(contents, null);
		if(clipboard.isDataFlavorAvailable(DataFlavor.stringFlavor)){
			return true;
		}
		return false;
	}

}
 

 

 

 

 

效果图

 

(也可见附件)


swing JTextArea

 

 

 

刚开始做的一个东西 , 功能很少 、、、一步步让它更强大

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