e637. 向剪切板获取和粘贴文本

This examples defines methods for getting and setting text on the system clipboard.

    // If a string is on the system clipboard, this method returns it;
    // otherwise it returns null.
    public static String getClipboard() {
        Transferable t = Toolkit.getDefaultToolkit().getSystemClipboard().getContents(null);

        try {
            if (t != null && t.isDataFlavorSupported(DataFlavor.stringFlavor)) {
                String text = (String)t.getTransferData(DataFlavor.stringFlavor);
                return text;
            }
        } catch (UnsupportedFlavorException e) {
        } catch (IOException e) {
        }
        return null;
    }

    // This method writes a string to the system clipboard.
    // otherwise it returns null.
    public static void setClipboard(String str) {
        StringSelection ss = new StringSelection(str);
        Toolkit.getDefaultToolkit().getSystemClipboard().setContents(ss, null);
    }

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