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;
}
}