JLable设置复制粘贴

                final JLabel keyLable = new JLabel(key);
                keyLable.addMouseListener(new MouseAdapter() {
                    @Override
                    public void mouseClicked(MouseEvent e) {
                        // TODO Auto-generated method stub
                        //双击选中
                        if(e.getClickCount() == 2) {
                            String clipboardStr = keyLable.getText();
                            setClipboardString(clipboardStr);
                            keyLable.setOpaque(true);
                            keyLable.setForeground(Color.BLUE);
                            keyLable.setFont(new Font("Helvetica", Font.BOLD, 14));
                        }
                    }
                    
                    @Override
                    public void mouseExited(MouseEvent e) {
                        // TODO Auto-generated method stub
                        keyLable.setOpaque(true);
                        keyLable.setForeground(Color.black);
                        keyLable.setFont(new Font("Helvetica", Font.PLAIN, 14));
                    }
                });

/**
     * 获取剪贴板内容(粘贴)
     */
    public String getClipboardString() {
        //获取系统剪贴板
        Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
        //获取剪贴板内容
        Transferable trans = clipboard.getContents(null);
        if(trans != null) {
            //判断剪贴板内容是否支持文本
            if(trans.isDataFlavorSupported(DataFlavor.stringFlavor)) {
                String clipboardStr = null;
                try {
                    //获取剪贴板的文本内容
                    clipboardStr = (String) trans.getTransferData(DataFlavor.stringFlavor);
                } catch (UnsupportedFlavorException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
                return clipboardStr;
            }
        }
        return null;
    }
    
    /**
     * 设置剪贴板内容(复制)
     */
    public static void setClipboardString(String str) {
        //获取协同剪贴板，单例
        Clipboard clipboard = Toolkit.getDefaultToolkit().getSystemClipboard();
        //封装文本内容
        Transferable trans = new StringSelection(str);
        //把文本内容设置到系统剪贴板上
        clipboard.setContents(trans, null);
    }