Java 实现HTML 页面转成image 图片

前言

在java 中把HTML转化成图档，思路基本上是现在 AWT or Swing 的Panel上显示网页，在把Panel输出为 image 文件。

java 本身的API有提供相关的结果，但是直接产生的效果不是很好，所以有出现一些 library.

Java Core API

public class HtmlToImage {

	protected static void generateOutput() throws Exception {
		
		//load the webpage into the editor
		//JEditorPane ed = new JEditorPane(new URL("http://www.google.com"));
		JEditorPane ed = new JEditorPane(new URL("http://www.hefeipet.com/client/chongwuzhishi/shenghuozatan/2012/0220/95.html"));
		ed.setSize(200,200);

		//create a new image
		BufferedImage image = new BufferedImage(ed.getWidth(), ed.getHeight(),
		                                        BufferedImage.TYPE_INT_ARGB);

		//paint the editor onto the image
		SwingUtilities.paintComponent(image.createGraphics(), 
		                              ed, 
		                              new JPanel(), 
		                              0, 0, image.getWidth(), image.getHeight());
		//save the image to file
		ImageIO.write((RenderedImage)image, "png", new File("html.png"));
	}
	public static void main(String[] args) {
		try {
			generateOutput();
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

}

java-html2image

下载地址：

http://code.google.com/p/java-html2image/

开源， 使用上很简洁。API Doc 和source code 都有。

import gui.ava.html.image.generator.HtmlImageGenerator;

public class Html2ImageTest {
	
	public static void main(String[] args) {
		HtmlImageGenerator imageGenerator = new HtmlImageGenerator();
//		imageGenerator
//				.loadHtml("<b>Hello World!</b> Please goto <a title=\"Goto Google\" href=\"http://www.google.com\">Google</a>.");
		//imageGenerator.loadUrl("http://mtkplmap2:7001/esdm_web"); 
		imageGenerator.loadUrl("http://www.hefeipet.com/client/chongwuzhishi/shenghuozatan/2012/0220/95.html"); 
		imageGenerator.saveAsImage("hello-world.png");
		imageGenerator.saveAsHtmlWithMap("hello-world.html", "hello-world.png");
	}

}

Cobra

免费，开源

http://lobobrowser.org/cobra.jsp

public class CobraTest {
	public static void main(String[] args) throws Exception {
		JFrame window = new JFrame();
		HtmlPanel panel = new HtmlPanel();
		window.getContentPane().add(panel);
		window.setSize(600, 400);
		window.setVisible(true);
		new SimpleHtmlRendererContext(panel, new SimpleUserAgentContext())
				.navigate("http://www.hefeipet.com/client/chongwuzhishi/shenghuozatan/2012/0220/95.html");

		BufferedImage image = new BufferedImage(panel.getWidth(),
				panel.getHeight(), BufferedImage.TYPE_INT_ARGB);

		// paint the editor onto the image
		SwingUtilities.paintComponent(image.createGraphics(), panel,
				new JPanel(), 0, 0, image.getWidth(), image.getHeight());
		// save the image to file
		ImageIO.write((RenderedImage) image, "png", new File("html.png"));
	}
}

WebRenderer

收费的。

http://www.webrenderer.com/

下载包里有包含很多例子， 效果类似在swing 中使用browser的功能

总结

不管是哪一种，多于样式复杂的页面，

产生的效果都不尽如人意。。。