JAVA读取EMF文件并转化为PNG,JPG,GIF格式

JAVA读取EMF文件并转化为PNG,JPG,GIF格式
使用第三方库下载地址为：http://java.freehep.org/vectorgraphics/index.html
主要思路：
使用EMFInputStream读取EMF文件，然后使用EMFRenderer对象将EMF绘制到创建
好的空白的BufferedImage里面。这样就把EMF图片转化为Java中的BufferedImage对
象，然后可以重新保存为Java 2D支持图像格式如PNG或者JPG等。
代码如下：

import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.image.BufferedImage; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.IOException;  import javax.imageio.ImageIO; import javax.swing.JFrame; import javax.swing.JPanel;  import org.freehep.graphicsio.emf.EMFInputStream; import org.freehep.graphicsio.emf.EMFRenderer; /**  * download the third-party libraries here:  * http://java.freehep.org/vectorgraphics/index.html  *   * @author gloomyfish  *  */  public class EMFReader { 	public static void main(String[] args) { 		try { 			EMFInputStream inputStream = new EMFInputStream(new FileInputStream("D:\\export.emf"), EMFInputStream.DEFAULT_VERSION); 			System.out.println("height = " + inputStream.readHeader().getBounds().getHeight()); 			System.out.println("widht = " + inputStream.readHeader().getBounds().getWidth()); 			 			// headerInfo of bitmap API always tell a lie, could not get  			// correct width and height 			// BitmapInfoHeader headerInfo = new BitmapInfoHeader(inputStream); 			// System.out.println("Big Error on reading emf format picture"); 			EMFRenderer emfRenderer = new EMFRenderer(inputStream); 			 			// create buffered image object from EMF render 		    final int width = (int)inputStream.readHeader().getBounds().getWidth(); 		    final int height = (int)inputStream.readHeader().getBounds().getHeight(); 		    System.out.println("widht = " + width + " and height = " + height); 		    final BufferedImage result = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB); 		    Graphics2D g2 = (Graphics2D)result.createGraphics(); 		    emfRenderer.paint(g2); 		     		    // write it as png/jpg/gif, up to you!!! 		    File outputfile = new File("D:\\result.png"); 		    ImageIO.write(result, "png", outputfile);  		    // display it 		    JPanel resultPanel = new JPanel() { 		    	/** 				 *  				 */ 				private static final long serialVersionUID = 1L;  				public void paintComponent(Graphics g) { 					super.paintChildren(g); 					Graphics2D g2 = (Graphics2D)g; 					g2.drawImage(result, 0, 0, width, height, null); 		    	} 		    }; 		    JFrame ui = new JFrame("EMF Reader"); 		    ui.getContentPane().setLayout(new BorderLayout()); 		    ui.getContentPane().add(resultPanel, BorderLayout.CENTER); 		    ui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 		    ui.setSize(new Dimension(width+20, height+40)); 		    ui.setVisible(true); 		} catch (FileNotFoundException e) { 			e.printStackTrace(); 		} catch (IOException e) { 			e.printStackTrace(); 		} 	}  }

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