Java通过URL截取网页快照并保存到指定目录--项目中不能连续截取

mingyue168 2014-04-18 02:54:01

[b]问题：1、在项目中只能截一次图，第一次截图后再进行其它操作，项目不是停掉【可能是这个语句引起：System.exit(0);】，就是一直刷新中。。。不能进行操作了。。。，怎么可以在项目中根据输入不同的URL连续的进行截图操作？求高手指点。。。

package com.test; import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.FlowLayout; import java.awt.image.BufferedImage; import java.io.File; import java.io.IOException; import javax.imageio.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 HTMLUtils 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 jsScreemSize; 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 HTMLUtils(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(jsScreemSize.toString()); int index = result == null ? -1 : result.indexOf(":"); NativeComponent nativeComponent = webBrowser .getNativeComponent(); Dimension originalSize = nativeComponent.getSize(); Dimension imageSize = new Dimension(Integer.parseInt(result .substring(0, index)), Integer.parseInt(result .substring(index + 1))); imageSize.width = Math.max(originalSize.width, imageSize.width + 50); imageSize.height = Math.max(originalSize.height, imageSize.height + 50); nativeComponent.setSize(imageSize); BufferedImage image = new BufferedImage(imageSize.width, imageSize.height, BufferedImage.TYPE_INT_RGB); nativeComponent.paintComponent(image); nativeComponent.setSize(originalSize); // 当网页超出目标大小时截取图片一部分，如果不执行，则截取整个网页页面 // if (imageSize.width > maxWidth || imageSize.height > maxHeight) { // 截图部分图形 // image = image.getSubimage(0, 0, maxWidth, maxHeight); /* * 此部分为使用缩略图 int width = image.getWidth(), height = image * .getHeight(); AffineTransform tx = new AffineTransform(); * tx.scale((double) maxWidth / width, (double) maxHeight / * height); AffineTransformOp op = new AffineTransformOp(tx, * AffineTransformOp.TYPE_NEAREST_NEIGHBOR); //缩小 image = * op.filter(image, null); */ // } try { // 输出图像 System.out.println(fileName); ImageIO.write(image, "jpg", new File(fileName)); } catch (IOException ex) { ex.printStackTrace(); } // 退出操作 System.exit(0);//Myeclipse中第一次调用正常，第二次调用直接把Myeclipse中项目停了 } } } ); 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 //实际项目中传入URL参数，根据不同参数截取不同网页快照，保存地址也可以在构造器中多设置一个参数，保存到指定目录 frame.getContentPane().add(new HTMLUtils("http://www.baidu.com", 640, 480), BorderLayout.CENTER); frame.setSize(1024, 1024); // 仅初始化，但不显示 frame.invalidate(); frame.pack(); frame.setVisible(false); } }); NativeInterface.runEventPump(); } }
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