判断剪切板Transferable内容是否是String

判断剪切板Transferable内容是否是String

• 方法1, 从clipboard获得transferable, 再用transferable的isDataFlavorSupported(DataFlavor flavor)方法判断

boolean 是否剪切板的内容是文本 = transferable.isDataFlavorSupported(DataFlavor.stringFlavor);

• 方法2 直接用clipboard的isDataFlavorAvailable(DataFlavor flavor)方法判断 , 该方法1.5版才有

boolean 是否剪切板的内容是文本 = systemClipboard.isDataFlavorAvailable(DataFlavor.stringFlavor);

Clipboard的isDataFlavorAvailable(DataFlavor flavor)方法从1.5版本开始才有, 可以简化代码, 其实质也是获得Transferable实例后调用其isDataFlavorSupported(DataFlavor flavor)方法判断 源码如下

    /**
     * Returns whether or not the current contents of this clipboard can be
     * provided in the specified {@code DataFlavor}.
     *
     * @param  flavor the requested {@code DataFlavor} for the contents
     * @return {@code true} if the current contents of this clipboard can be
     *         provided in the specified {@code DataFlavor}; {@code false}
     *         otherwise
     * @throws NullPointerException if {@code flavor} is {@code null}
     * @throws IllegalStateException if this clipboard is currently unavailable
     * @since 1.5
     */
    public boolean isDataFlavorAvailable(DataFlavor flavor) {
        if (flavor == null) {
            throw new NullPointerException("flavor");
        }

        Transferable cntnts = getContents(null);
        if (cntnts == null) {
            return false;
        }
        return cntnts.isDataFlavorSupported(flavor);
    }

这里是引用