JAVA讀取EMF檔案并轉化為PNG,JPG,GIF格式

JAVA讀取EMF檔案并轉化為PNG,JPG,GIF格式

使用第三方庫下載下傳位址為：http://java.freehep.org/vectorgraphics/index.html

主要思路：

使用EMFInputStream讀取EMF檔案，然後使用EMFRenderer對象将EMF繪制到建立

好的空白的BufferedImage裡面。這樣就把EMF圖檔轉化為Java中的BufferedImage對

象，然後可以重新儲存為Java 2D支援圖像格式如PNG或者JPG等。

代碼如下：

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();
		}
	}

}