java.awt.datatransfer.Clipboard剪切板获取String字符串文本

java.awt.datatransfer.Clipboard剪切板获取String字符串文本

有两种方法获取

• 直接从Clipboard获得

  (String) systemClipboard.getData(DataFlavor.stringFlavor);
  

• 从Clipboard获得Transable再获得String

  (String) systemClipboard.getContents(null).getTransferData(DataFlavor.stringFlavor);
  

Clipboard 的 getData(DataFlavor flavor) 的源码, java1.5版开始才有

    public Object getData(DataFlavor flavor)
        throws UnsupportedFlavorException, IOException {
        if (flavor == null) {
            throw new NullPointerException("flavor");
        }

        Transferable cntnts = getContents(null);
        if (cntnts == null) {
            throw new UnsupportedFlavorException(flavor);
        }
        return cntnts.getTransferData(flavor);
    }

包装的获取剪切板文本的方法,没有判断内容是否是String

	public static String getSystemClipboardString(Clipboard systemClipboard) {
		String result = null;
		if(systemClipboard==null)systemClipboard=Toolkit.getDefaultToolkit().getSystemClipboard();
		try {
			
//			result = (String) systemClipboard.getContents(null).getTransferData(DataFlavor.stringFlavor);
			// ↑都可↓ 下面的getData方法1.5版才有
			result = (String) systemClipboard.getData(DataFlavor.stringFlavor);
			
		} catch (UnsupportedFlavorException | IOException e) {
			e.printStackTrace();
		}
		return result;
	}
	
	public static String getSystemClipboardString() {return getSystemClipboardString(null);}

import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.io.IOException;

public class AwtClipboard获取剪切板文本的方法 {
	
	public static String getSystemClipboardString(Clipboard systemClipboard) {
		String result = null;
		if(systemClipboard==null)systemClipboard=Toolkit.getDefaultToolkit().getSystemClipboard();
		try {
			
//			result = (String) systemClipboard.getContents(null).getTransferData(DataFlavor.stringFlavor);
			// ↑都可↓ 下面的getData方法1.5版才有
			result = (String) systemClipboard.getData(DataFlavor.stringFlavor);
			
		} catch (UnsupportedFlavorException | IOException e) {
			e.printStackTrace();
		}
		return result;
	}
	
	public static String getSystemClipboardString() {return getSystemClipboardString(null);}
	
	
	
	public static void main(String...arguments) {
		System.out.println(getSystemClipboardString());
	}

}

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);
    }

包装的获取剪切板文本的方法,且判断内容是否是String

	public static String getSystemClipboardString(Clipboard systemClipboard) {
		String result = "剪切板的内容不是字符串文本StringText";
		if(systemClipboard==null)systemClipboard=Toolkit.getDefaultToolkit().getSystemClipboard();
		
//		boolean 剪切板的内容是文本 = systemClipboard.getContents(null).isDataFlavorSupported(DataFlavor.stringFlavor);
		boolean 剪切板的内容是文本 = systemClipboard.isDataFlavorAvailable(DataFlavor.stringFlavor); // 1.5版才有
		
		if(剪切板的内容是文本) {
			try {
				
//				result = (String) systemClipboard.getContents(null).getTransferData(DataFlavor.stringFlavor);
				result = (String) systemClipboard.getData(DataFlavor.stringFlavor); // 1.5版才有
				
			} catch (UnsupportedFlavorException | IOException e) {e.printStackTrace();}
		}
		return result;
	}
	
	public static String getSystemClipboardString() {return getSystemClipboardString(null);}

package 剪切板复制粘贴;

import java.awt.Toolkit;
import java.awt.datatransfer.*;
import java.io.IOException;

public class 判断剪切板的内容是文本才获取 {
	
	public static String getSystemClipboardString(Clipboard systemClipboard) {
		String result = "剪切板的内容不是字符串文本StringText";
		if(systemClipboard==null)systemClipboard=Toolkit.getDefaultToolkit().getSystemClipboard();
		
//		boolean 剪切板的内容是文本 = systemClipboard.getContents(null).isDataFlavorSupported(DataFlavor.stringFlavor);
		boolean 剪切板的内容是文本 = systemClipboard.isDataFlavorAvailable(DataFlavor.stringFlavor); // 1.5版才有
		
		if(剪切板的内容是文本) {
			try {
				
//				result = (String) systemClipboard.getContents(null).getTransferData(DataFlavor.stringFlavor);
				result = (String) systemClipboard.getData(DataFlavor.stringFlavor); // 1.5版才有
				
			} catch (UnsupportedFlavorException | IOException e) {e.printStackTrace();}
		}
		return result;
	}
	
	public static String getSystemClipboardString() {return getSystemClipboardString(null);}
	
	public static void main (String...arguments)throws Exception{
		System.out.println(getSystemClipboardString());
	}

}