Java将HTML页面生成图片
我们公司主要是做微信营销的，客户提出了一个需求就是生成微信海报用于提供粉丝转发。不在废话直接上代码。
package dayo.ztest.utils;
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 java.util.Date;
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 PrintScreen4DJNativeSwingUtils 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", "//");
// 当网页超出目标大小时 截取
final static public int maxWidth = 640;
final static public int maxHeight = 640;
/**
* @param file
* 预生成的图片全路径
* @param url
* 网页地址
* @param width
* 打开网页宽度 ，0 = 全屏
* @param height
* 打开网页高度 ，0 = 全屏
* @return boolean
* @author AndyBao
* @version V4.0, 2016年9月28日 下午3:55:52
*/
public PrintScreen4DJNativeSwingUtils(final String file, final String url,
final String WithResult) {
super(new BorderLayout());
JPanel webBrowserPanel = new JPanel(new BorderLayout());
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(WithResult);
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);
imageSize.height = Math.max(originalSize.height,
imageSize.height);
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
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
ImageIO.write(image, "jpg", new File(file));
} catch (IOException ex) {
ex.printStackTrace();
}
// 退出操作
System.exit(0);
}
}
});
add(panel, BorderLayout.SOUTH);
}
// 以javascript脚本获得网页全屏后大小
public static String getScreenWidthHeight() {
StringBuffer 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;");
return jsDimension.toString();
}
public static boolean printUrlScreen2jpg(final String file,
final String url, final int width, final int height) {
NativeInterface.open();
SwingUtilities.invokeLater(new Runnable() {
public void run() {
String withResult = "var width = " + width + ";var height = "
+ height + ";return width +':' + height;";
if (width == 0 || height == 0)
withResult = getScreenWidthHeight();
// SWT组件转Swing组件，不初始化父窗体将无法启动webBrowser
JFrame frame = new JFrame("网页截图");
// 加载指定页面，最大保存为640x480的截图
frame.getContentPane().add(
new PrintScreen4DJNativeSwingUtils(file, url,
withResult), BorderLayout.CENTER);
frame.setSize(640, 480);
// 仅初始化，但不显示
frame.invalidate();
frame.pack();
frame.setVisible(false);
}
});
NativeInterface.runEventPump();
return true;
}
public static void main(String[] args) {
PrintScreen4DJNativeSwingUtils.printUrlScreen2jpg("D:/hello-world/"+new Date().getTime()+".png", "http://localhost:8099/index.html", 0, 0);
}
}
jar包下载请点击
原文链接：http://blog.csdn.net/buddyuu/article/details/52699997