java读取粘贴板内容——将图片转成png或者jpg格式

package com;

import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.datatransfer.Clipboard;
import java.awt.datatransfer.DataFlavor;
import java.awt.datatransfer.StringSelection;
import java.awt.datatransfer.Transferable;
import java.awt.datatransfer.UnsupportedFlavorException;
import java.awt.image.BufferedImage;
import java.awt.image.RenderedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;

public class Test {
	public static void main(String[] args) {
		
		try {
			//获取粘贴板图片
			Image image = Test.getImageFromClipboard();
			File file= new File("D:\\a.png");
			//转成jpg
			//BufferedImage bufferedImage = new BufferedImage(image.getWidth(null), image.getHeight(null), BufferedImage.TYPE_INT_RGB);
			//转成png
			BufferedImage bufferedImage = new BufferedImage(image.getWidth(null), image.getHeight(null), BufferedImage.TYPE_INT_ARGB);
			Graphics2D g = bufferedImage.createGraphics();
			g.drawImage(image, null, null);
			//ImageIO.write((RenderedImage)bufferedImage, "jpg", file);
			ImageIO.write((RenderedImage)bufferedImage, "png", file);

		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}
	
	
	/**
	 * 从剪切板获得文字。
	 */
	public static String getSysClipboardText() {
		String ret = "";
		Clipboard sysClip = Toolkit.getDefaultToolkit().getSystemClipboard();
		// 获取剪切板中的内容
		Transferable clipTf = sysClip.getContents(null);
		
		if (clipTf != null) {
			// 检查内容是否是文本类型
			if (clipTf.isDataFlavorSupported(DataFlavor.stringFlavor)) {
				try {
					ret = (String) clipTf
							.getTransferData(DataFlavor.stringFlavor);
				} catch (Exception e) {
					e.printStackTrace();
				}
			}
		}

		return ret;
	}

	/**
	 * 将字符串复制到剪切板。
	 */
	public static void setSysClipboardText(String writeMe) {
		Clipboard clip = Toolkit.getDefaultToolkit().getSystemClipboard();
		Transferable tText = new StringSelection(writeMe);
		clip.setContents(tText, null);
	}

	/**
	 * 从剪切板获得图片。
	 */
	public static Image getImageFromClipboard() throws Exception {
		Clipboard sysc = Toolkit.getDefaultToolkit().getSystemClipboard();
		Transferable cc = sysc.getContents(null);
		if (cc == null)
			return null;
		else if (cc.isDataFlavorSupported(DataFlavor.imageFlavor))
			return (Image) cc.getTransferData(DataFlavor.imageFlavor);
		return null;
	}

	/**
	 * 复制图片到剪切板。
	 */
	public static void setClipboardImage(final Image image) {
		Transferable trans = new Transferable() {
			public DataFlavor[] getTransferDataFlavors() {
				return new DataFlavor[] { DataFlavor.imageFlavor };
			}

			public boolean isDataFlavorSupported(DataFlavor flavor) {
				return DataFlavor.imageFlavor.equals(flavor);
			}

			public Object getTransferData(DataFlavor flavor)
					throws UnsupportedFlavorException, IOException {
				if (isDataFlavorSupported(flavor))
					return image;
				throw new UnsupportedFlavorException(flavor);
			}

		};
		Toolkit.getDefaultToolkit().getSystemClipboard().setContents(trans,
				null);
	}
}