java網頁快照-網頁轉存為圖片

個人覺得免費的java實現方式，最方便的網頁快照生成方式。可以生成大型網頁的快照。非常棒！

使用代碼前需要導入 jar包。需要三個jar包 ：swt-3.6M3-win32-win32-x86.jar，DJNativeSwing-SWT.jar,DJNativeSwing.jar

運行環境：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腳本獲得網頁全屏后大小

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() {

// 監聽加載進度

public void loadingProgressChanged(WebBrowserEvent e) {

// 當加載完畢時

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);

// 當網頁超出目標大小時

if (p_w_picpathSize.width > maxWidth

|| p_w_picpathSize.height > maxHeight) {

//截圖部分圖形

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

/*此部分為使用縮略圖

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);

//縮小

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

}

try {

// 輸出圖像

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組件轉Swing組件，不初始化父窗體將無法啟動webBrowser

JFrame frame = new JFrame("以DJ組件保存指定網頁截圖");

// 加載google，最大保存為640x480的截圖

frame.getContentPane().add(

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

BorderLayout.CENTER);

frame.setSize(800, 600);

// 僅初始化，但不顯示

frame.invalidate();

frame.pack();

frame.setVisible(false);

}

});

NativeInterface.runEventPump();

}

}

總結

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