JAVA实现网页快照,存为图片格式

原文：http://blog.csdn.net/java2000_net/article/details/3643528

截取的google的效果，将就吧，不是特别好。 但是作为普通的应用，我想这个效果我已经很满意了。
注意，里面的 
this.setVisible(true);
这句话如果运行在一些不能显示图形界面的机器上，请屏蔽掉它，不过这样的话，网页里的图片就不能被截取了。


效果图：



完整的源代码如下：

import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.geom.AffineTransform;
import java.awt.image.BufferedImage;
import java.awt.image.ColorModel;
import java.awt.image.WritableRaster;
import java.io.*;
import javax.imageio.*;
import javax.swing.*;

/**
 * HTML2JPG,HTML页面转图片的实现方法。
 * 
 * @author 老紫竹(Java世纪网,java2000.net)
 */
public class Test extends JFrame {

  public Test(String url, File file) throws Exception {
    JEditorPane editorPane = new JEditorPane();
    editorPane.setEditable(false);
    editorPane.setPage(url);
    JScrollPane jsp = new JScrollPane(editorPane);
    getContentPane().add(jsp);
    this.setLocation(0, 0);
    this.setVisible(true); // 如果这里不设置可见，则里面的图片等无法截取
    
    // 如果不延时，则图片等可能没有时间下载显示
    // 具体的秒数需要根据网速等调整
    Thread.sleep(5 * 1000);

    setSize(10000, 10000);

    pack();
    // BufferedImage image = new BufferedImage(editorPane.getWidth(),
    // editorPane.getHeight(), BufferedImage.TYPE_INT_RGB);
    BufferedImage image = new BufferedImage(editorPane.getWidth(), editorPane.getHeight(),
        BufferedImage.TYPE_INT_RGB);
    Graphics2D graphics2D = image.createGraphics();
    editorPane.paint(graphics2D);
    
    BufferedImage image1 = resize(image, 600, 400);

    ImageIO.write(image1, "jpg", file);
    dispose();
  }

  public static void main(String[] args) throws Exception {
    new Test("http://www.google.cn", new File("d:/file.jpg"));
  }

  public static BufferedImage resize(BufferedImage source, int targetW, int targetH) {
    // targetW，targetH分别表示目标长和宽
    int type = source.getType();
    BufferedImage target = null;
    double sx = (double) targetW / source.getWidth();
    double sy = (double) targetH / source.getHeight();
    // 这里想实现在targetW，targetH范围内实现等比缩放。如果不需要等比缩放
    // 则将下面的if else语句注释即可
    if (sx > sy) {
      sx = sy;
      targetW = (int) (sx * source.getWidth());
      // } else {
      // sy = sx;
      // targetH = (int) (sy * source.getHeight());
    }
    if (type == BufferedImage.TYPE_CUSTOM) { // handmade
      ColorModel cm = source.getColorModel();
      WritableRaster raster = cm.createCompatibleWritableRaster(targetW, targetH);
      boolean alphaPremultiplied = cm.isAlphaPremultiplied();
      target = new BufferedImage(cm, raster, alphaPremultiplied, null);
    } else
      target = new BufferedImage(targetW, targetH, type);
    Graphics2D g = target.createGraphics();
    // smoother than exlax:
    g.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
    g.drawRenderedImage(source, AffineTransform.getScaleInstance(sx, sy));
    g.dispose();
    return target;
  }
}