java 网页 pdf java 网页转图片

java在图像这一块非常弱。用java实现java截图倒不难，原理吗就是把当前屏幕存成一个图，然后获取鼠标拉去的想去位置然后把截取的图保存到panel里边，再生成图片即可：示例代码就不展示了，网上很多。下边说几个将网页保存为图片的框架：

①html2image

网上炒这个还不少呢。我说这个就是原声的java代码进行封装的一个jar包。效果非常差，代码就不贴了网上好多。

②cobra

如果你不知道这个的话，你应该听说过lobobrowser，纯java实现的浏览器，测试了下，除了启动慢的要死其他还可以。

这个代码截取还是不错的，不说了直接上代码：

1 package htmlToImage;
 2  
 3 import java.awt.image.BufferedImage;
 4 import java.awt.image.RenderedImage;
 5 import java.io.File;
 6  
 7 import javax.imageio.ImageIO;
 8 import javax.swing.JFrame;
 9 import javax.swing.JPanel;
10 import javax.swing.SwingUtilities;
11  
12 import org.lobobrowser.html.gui.HtmlPanel;
13 import org.lobobrowser.html.test.SimpleHtmlRendererContext;
14 import org.lobobrowser.html.test.SimpleUserAgentContext;
15  
16 public class CobraTest {
17     public static void main(String[] args) throws Exception {
18         JFrame window = new JFrame();
19         HtmlPanel panel = new HtmlPanel();
20         window.getContentPane().add(panel);
21         window.setSize(600, 400);
22         window.setVisible(true);
23         new SimpleHtmlRendererContext(panel, new SimpleUserAgentContext())
24                 .navigate("http://jobs.zhaopin.com/377931819252715.htm?ssidkey=y&ss=201&ff=03");
25         System.out.println("10");
26         Thread.sleep(10000);
27         BufferedImage image = new BufferedImage(panel.getWidth(),
28                 panel.getHeight(), BufferedImage.TYPE_INT_ARGB);
29  
30         // paint the editor onto the image
31         SwingUtilities.paintComponent(image.createGraphics(), panel,
32                 new JPanel(), 0, 0, image.getWidth(), image.getHeight());
33         // save the image to file
34         ImageIO.write((RenderedImage) image, "png", new File("html.png"));
35         System.out.println("www");
36     }
37 }

但是这个框架应该有个限制，css3应该支持不了。

③cssbox

这个非常不错。如果网站不做故意限制的话，截图非常完美。。。

package htmlToImage;
 
import java.io.File;
import java.io.FileOutputStream;
 
import org.fit.cssbox.demo.ImageRenderer;
 
public class CssBox {
    public static void main(String[] args) throws Exception {
        ImageRenderer render = new ImageRenderer();
        System.out.println("kaishi");
        String url = "http://www.xiachufang.com/";
        FileOutputStream out = new FileOutputStream(new File("D:"+File.separator+"html.png"));
        render.renderURL(url, out, ImageRenderer.TYPE_PNG);
        System.out.println("OK");
    }
}

 

④java原生代码

package htmlToImage;
 
import java.awt.image.BufferedImage;
import java.awt.image.RenderedImage;
import java.io.File;
import java.net.URL;
 
import javax.imageio.ImageIO;
import javax.swing.JEditorPane;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
 
/**
 * 原理就是在现在的awt或者swing上显示网页然后将内容保存为一个图片
 * 没办法控制延迟啊。
 * @author zlqiao
 *
 */
public class JavaCoreApi {
    public static void main(String[] args) 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.baidu.com"));
        System.out.println("10");
        Thread.sleep(10000);
        ed.setSize(1000,1000);
 
        //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"));
            System.out.println("ok");
     
    }
}