swing 对文本域截图

swing 对文本域截图

直接上代码:

 /***
	     * convert JTextArea to image
	     * @param ta
	     * @param destFile
	     * @param format
	     */
	    public static BufferedImage generateImage(JComponent ta,File destFile,String format,Integer specifiedHeight,Integer specifiedWidth){//TODO 如何提高分辨率
	    	int height=ta.getHeight();
			int width=ta.getWidth();
	    	if(specifiedHeight!=null&&specifiedHeight!=SystemHWUtil.NEGATIVE_ONE){//如果指定了高度
	    		height=specifiedHeight;
	    	}
			if(specifiedWidth!=null&&specifiedWidth!=SystemHWUtil.NEGATIVE_ONE){//如果指定了高度
				width=specifiedWidth;
			}
            BufferedImage img = new BufferedImage(width * 4, height * 4, BufferedImage.TYPE_INT_RGB);
            Graphics2D g2d = img.createGraphics();
            g2d.scale(4, 4);
           
	        ta.printAll(g2d);
	        g2d.dispose();
	        if(!ValueWidget.isNullOrEmpty(destFile)){
	        	try {
		            ImageIO.write(img, format/*"jpg"*/, destFile);
		        } catch (IOException ex) {
		            ex.printStackTrace();
		        }
	        }

	        return img;
		}

提高分辨率:

 

调用:

 /***
     * 截图,截屏
     * @param ta
     * @param specifiedHeight
     * @param specifiedWidth
     */
    public static void generateImageAndCopy(JTextComponent ta, Integer specifiedHeight,Integer specifiedWidth) {
		BufferedImage img = ImageHWUtil.generateImage(ta, null, "jpg"/*picFormat*/,specifiedHeight,specifiedWidth);
		if(ValueWidget.isNullOrEmpty(img)){
			return;
		}
		ComponentUtil.setClipboardImage(ta.getParent(),img);
		ToastMessage.toast("复制图片到剪切板",3000);
	}
/***
	 * 复制图片到剪切板
	 * @param image
	 */
	public static void setClipboardImage(Container frame, final Image image) {
		Transferable trans = new Transferable() {
			@Override
			public Object getTransferData(DataFlavor flavor)
					throws UnsupportedFlavorException, IOException {
				if (isDataFlavorSupported(flavor)) {
					return image;
				}
				throw new UnsupportedFlavorException(flavor);
			}

			@Override
			public DataFlavor[] getTransferDataFlavors() {
				return new DataFlavor[] { DataFlavor.imageFlavor };
			}

			@Override
			public boolean isDataFlavorSupported(DataFlavor flavor) {
				return DataFlavor.imageFlavor.equals(flavor);
			}
		};
		
		frame.getToolkit().getSystemClipboard().setContents(trans, null);
	}

Try creating the BufferedImage with twice the size (ie. size.width * 2, size.height * 2), then set ig's scale to 2 and g2draw's scale to 0.5.

参考:http://stackoverflow.com/questions/31393438/java-swing-bufferedimage-poor-quality