java模拟浏览器截取指定大小的验证码图片

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应用场景： 识别网页验证码，破解并登陆页面
难点：验证码直接下载的话会造成下载的图片和网站的图片不一致， 原因（验证码的图片地址访问一次就会随机生成一个验证码），所以我采用模拟器截图的方式

代码：

package com.teamdev.jxbrowser.chromium.demoJD.yyzz;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
import java.util.logging.Level;

import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.WindowConstants;

import com.teamdev.jxbrowser.chromium.Browser;
import com.teamdev.jxbrowser.chromium.BrowserPreferences;
import com.teamdev.jxbrowser.chromium.JSValue;
import com.teamdev.jxbrowser.chromium.LoggerProvider;
import com.teamdev.jxbrowser.chromium.events.FinishLoadingEvent;
import com.teamdev.jxbrowser.chromium.events.LoadAdapter;
import com.teamdev.jxbrowser.chromium.swing.BrowserView;

public class saveImage {

private static final Color White = null;

public static void main(String[] args) {
LoggerProvider.getBrowserLogger().setLevel(Level.SEVERE);
LoggerProvider.getIPCLogger().setLevel(Level.SEVERE);
LoggerProvider.getChromiumProcessLogger().setLevel(Level.SEVERE);

Browser browser = new Browser();

BrowserView view = new BrowserView(browser);
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
frame.add(view, BorderLayout.CENTER);
frame.setSize(700, 500);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
BrowserPreferences preferences = browser.getPreferences();
preferences.setImagesEnabled(false);

int viewWidth = 1280;
int viewHeight = 1000;
// Resize view to the required size
view.setBounds(new Rectangle(viewWidth, viewHeight));
// Wait until web page is loaded completely
invokeAndWaitReady(browser,new jd_yyzz().new ViewThread(browser, "https://mall.jd.com/showLicence-652046.html"));

JSValue bodyHeight = null;
int firstHeight = 400;
int nowHeight = 400;

while (firstHeight != nowHeight) {
try {
Thread.sleep(1000);
} catch (InterruptedException e1) {
e1.printStackTrace();
}
firstHeight = nowHeight;

bodyHeight = browser.executeJavaScriptAndReturnValue("document.body.scrollHeight");
//nowHeight = 900;
for (int i = firstHeight; i < nowHeight; i = i + 300) {
browser.executeJavaScriptAndReturnValue("window.scrollTo(0,"+ i + ")");
try {
Thread.sleep(500);
} catch (InterruptedException e1) {
e1.printStackTrace();
}
}
System.out.println(firstHeight + ":" + nowHeight);
}
viewHeight = nowHeight + 50;
view.setBounds(new Rectangle(viewWidth, viewHeight));
System.out.println("高度:" + viewHeight);
try {
Thread.sleep(1000 * 1);
} catch (InterruptedException e1) {
e1.printStackTrace();
}
bodyHeight = browser.executeJavaScriptAndReturnValue("document.body.scrollHeight");
System.out.println("高度------------------:" + bodyHeight);
int viewHeight_new = ((Number) bodyHeight.getNumber()).intValue() + 50;
if (viewHeight_new > viewHeight) {
System.out.println("新高度------------------:" + viewHeight_new);
}
Image image = view.getImage();
BufferedImage bufferedImage = new BufferedImage(100, 50,BufferedImage.TYPE_4BYTE_ABGR);
Graphics2D graphics = (Graphics2D) bufferedImage.getGraphics();
Double scale = 1.0 / view.getDeviceScaleFactor();
graphics.scale(scale, scale);
graphics.drawImage(image,-585, -355, image.getWidth(view), image.getHeight(view),White, null);
try {
String path = "f://shopdetails.jpg";
ImageIO.write(bufferedImage, "JPG", new File(path));
bufferedImage = null;
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 线程
* */
class ViewThread extends Thread {
Browser browser;
String openUrl;

public ViewThread(Browser browser, String openUrl) {
this.browser = browser;
this.openUrl = openUrl;
}

public void run() {

browser.loadURL(openUrl);

}
}

/**
* 模拟器加载url
* */
public static void invokeAndWaitReady(Browser browser, Runnable runnable) {
final CountDownLatch latch = new CountDownLatch(1);
LoadAdapter listener = new LoadAdapter() {
@Override
public void onFinishLoadingFrame(FinishLoadingEvent event) {
if (event.isMainFrame()) {
latch.countDown();
}
}
};
browser.addLoadListener(listener);
try {
runnable.run();
try {
if (!latch.await(60, TimeUnit.SECONDS)) {
// throw new RuntimeException(new TimeoutException());
}
} catch (InterruptedException ignore) {
ignore.printStackTrace();
Thread.currentThread().interrupt();
}
} finally {
browser.removeLoadListener(listener);
}
}
}