java网页快照-网页转存为图片

个人觉得免费的java实现方式，最方便的网页快照生成方式。可以生成大型网页的快照。非常棒！

使用代码前需要导入 jar包。需要三个jar包 ：swt-3.6M3-win32-win32-x86.jar，DJNativeSwing-SWT.jar,DJNativeSwing.jar

运行环境：jdk1.6以上

import java.awt.BorderLayout;

import java.awt.Dimension;

import java.awt.FlowLayout;

import java.awt.p_w_picpath.BufferedImage;

import java.io.File;

import java.io.IOException;

import javax.p_w_picpathio.ImageIO;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.SwingUtilities;

import chrriis.dj.nativeswing.swtimpl.NativeComponent;

import chrriis.dj.nativeswing.swtimpl.NativeInterface;

import chrriis.dj.nativeswing.swtimpl.components.JWebBrowser;

import chrriis.dj.nativeswing.swtimpl.components.WebBrowserAdapter;

import chrriis.dj.nativeswing.swtimpl.components.WebBrowserEvent;

public class Main extends JPanel {

/**

*

*/

private static final long serialVersionUID = 1L;

// 行分隔符

final static public String LS = System.getProperty("line.separator", "\n");

// 文件分割符

final static public String FS = System.getProperty("file.separator", "\\");

//以javascript脚本获得网页全屏后大小

final static StringBuffer jsDimension;

static {

jsDimension = new StringBuffer();

jsDimension.append("var width = 0;").append(LS);

jsDimension.append("var height = 0;").append(LS);

jsDimension.append("if(document.documentElement) {").append(LS);

jsDimension.append(

"  width = Math.max(width, document.documentElement.scrollWidth);")

.append(LS);

jsDimension.append(

"  height = Math.max(height, document.documentElement.scrollHeight);")

.append(LS);

jsDimension.append("}").append(LS);

jsDimension.append("if(self.innerWidth) {").append(LS);

jsDimension.append("  width = Math.max(width, self.innerWidth);")

.append(LS);

jsDimension.append("  height = Math.max(height, self.innerHeight);")

.append(LS);

jsDimension.append("}").append(LS);

jsDimension.append("if(document.body.scrollWidth) {").append(LS);

jsDimension.append(

"  width = Math.max(width, document.body.scrollWidth);")

.append(LS);

jsDimension.append(

"  height = Math.max(height, document.body.scrollHeight);")

.append(LS);

jsDimension.append("}").append(LS);

jsDimension.append("return width + ':' + height;");

}

public Main(final String url, final int maxWidth, final int maxHeight) {

super(new BorderLayout());

JPanel webBrowserPanel = new JPanel(new BorderLayout());

final String fileName = System.currentTimeMillis() + ".jpg";

final JWebBrowser webBrowser = new JWebBrowser(null);

webBrowser.setBarsVisible(false);

webBrowser.navigate(url);

webBrowserPanel.add(webBrowser, BorderLayout.CENTER);

add(webBrowserPanel, BorderLayout.CENTER);

JPanel panel = new JPanel(new FlowLayout(FlowLayout.CENTER, 4, 4));

webBrowser.addWebBrowserListener(new WebBrowserAdapter() {

// 监听加载进度

public void loadingProgressChanged(WebBrowserEvent e) {

// 当加载完毕时

if (e.getWebBrowser().getLoadingProgress() == 100) {

String result = (String) webBrowser

.executeJavascriptWithResult(jsDimension.toString());

int index = result == null ? -1 : result.indexOf(":");

NativeComponent nativeComponent = webBrowser

.getNativeComponent();

Dimension originalSize = nativeComponent.getSize();

Dimension p_w_picpathSize = new Dimension(Integer.parseInt(result

.substring(0, index)), Integer.parseInt(result

.substring(index + 1)));

p_w_picpathSize.width = Math.max(originalSize.width,

p_w_picpathSize.width + 50);

p_w_picpathSize.height = Math.max(originalSize.height,

p_w_picpathSize.height + 50);

nativeComponent.setSize(p_w_picpathSize);

BufferedImage p_w_picpath = new BufferedImage(p_w_picpathSize.width,

p_w_picpathSize.height, BufferedImage.TYPE_INT_RGB);

nativeComponent.paintComponent(p_w_picpath);

nativeComponent.setSize(originalSize);

// 当网页超出目标大小时

if (p_w_picpathSize.width > maxWidth

|| p_w_picpathSize.height > maxHeight) {

//截图部分图形

p_w_picpath = p_w_picpath.getSubp_w_picpath(0, 0, maxWidth, maxHeight);

/*此部分为使用缩略图

int width = p_w_picpath.getWidth(), height = p_w_picpath

.getHeight();

AffineTransform tx = new AffineTransform();

tx.scale((double) maxWidth / width, (double) maxHeight

/ height);

AffineTransformOp op = new AffineTransformOp(tx,

AffineTransformOp.TYPE_NEAREST_NEIGHBOR);

//缩小

p_w_picpath = op.filter(p_w_picpath, null);*/

}

try {

// 输出图像

ImageIO.write(p_w_picpath, "jpg", new File(fileName));

} catch (IOException ex) {

ex.printStackTrace();

}

// 退出操作

System.exit(0);

}

}

}

);

add(panel, BorderLayout.SOUTH);

}

public static void main(String[] args) {

NativeInterface.open();

SwingUtilities.invokeLater(new Runnable() {

public void run() {

// SWT组件转Swing组件，不初始化父窗体将无法启动webBrowser

JFrame frame = new JFrame("以DJ组件保存指定网页截图");

// 加载google，最大保存为640x480的截图

frame.getContentPane().add(

new Main(http://yijianfengvip.blog.163.com/, 640, 480),

BorderLayout.CENTER);

frame.setSize(800, 600);

// 仅初始化，但不显示

frame.invalidate();

frame.pack();

frame.setVisible(false);

}

});

NativeInterface.runEventPump();

}

}