Java 硒铬屏幕截图-html2canvas
我正在使用html2canvas.js库与selenium一起拍摄全页屏幕截图Java 硒铬屏幕截图-html2canvas,java,google-chrome,selenium,selenium-webdriver,html2canvas,Java,Google Chrome,Selenium,Selenium Webdriver,Html2canvas,我正在使用html2canvas.js库与selenium一起拍摄全页屏幕截图 public class ChromeCanvasCapture { private static final String APP_URL = "http://www.flipkart.com"; public static String getFileContent(String filePath) throws FileNotFoundException, IOExcepti
public class ChromeCanvasCapture {
private static final String APP_URL = "http://www.flipkart.com";
public static String getFileContent(String filePath)
throws FileNotFoundException, IOException {
FileInputStream inputStream = new FileInputStream(filePath);
String fileContent = IOUtils.toString(inputStream);
inputStream.close();
return fileContent;
}
public static void main(String[] args) {
WebDriver webDriver = null;
try {
System.setProperty("webdriver.chrome.driver",
"D:\\Drivers\\chromedriver.exe");
webDriver = new ChromeDriver();
webDriver.get(APP_URL);
webDriver.manage().window().maximize();
if (webDriver instanceof JavascriptExecutor) {
// scroll to the bottom of the page
((JavascriptExecutor) webDriver) .executeScript("window.scrollTo(0,document.body.scrollHeight)");
// //scroll to the top of the page
((JavascriptExecutor) webDriver)
.executeScript("window.scrollTo(0,0)");
}
String jsFile = getFileContent("html2canvas.js");
jsFile = jsFile
+ " var webDriverCallback = arguments[arguments.length - 1]; html2canvas(document.body, {onrendered: function(canvas) {var img = canvas.toDataURL('image/png').replace('data:image/png;base64,', '');; webDriverCallback(img); }";
System.out.println(jsFile);
webDriver.manage().timeouts().setScriptTimeout(5, TimeUnit.SECONDS);
if (webDriver instanceof JavascriptExecutor) {
JavascriptExecutor executor = (JavascriptExecutor) webDriver;
Object result = executor.executeAsyncScript(jsFile);
String imageString = String.valueOf(result);
byte[] imageData = Base64.decodeBase64(imageString);
OutputStream outputStream = new FileOutputStream(
"C:\\Captures\\canvas_captured.png");
outputStream.write(imageData);
outputStream.close();
}
} catch (IOException e) {
e.printStackTrace();
} finally {
// webDriver.quit();
}
}
}
我将html2canvas.js文件保存在java项目的类路径中。我用来获取屏幕截图的java脚本代码是:
var webDriverCallback = arguments[arguments.length - 1];
html2canvas(document.body, {
onrendered: function(canvas) {
var img = canvas.toDataURL('image/png').replace('data:image/png;base64,', '');;
webDriverCallback(img);
}
});
我能够捕获flipkart页面的全页屏幕截图,但没有任何图像
我无法从chrome使用TakeScreenshot实用程序,因为它不允许使用chrome浏览器拍摄整页屏幕快照
html2canvas脚本通过遍历页面的DOM来工作,它收集所有元素的信息,然后,它使用它来构建页面的表示,这意味着它实际上不获取页面的屏幕截图,而是通过读取DOM来构建表示(ie)整个图像是在客户端浏览器上创建的,因此它也不会绕过任何浏览器内容策略限制 根据同源策略,web浏览器允许网页中包含的脚本从另一个网页访问数据,前提是两个网页具有相同的源。因此,脚本使用的所有图像都需要位于同一来源下才能读取。但在您的情况下,这些图像是从不同的域加载到flipkart.com中的(您可以通过flipkart中图像的src属性验证这一点) 另一个选择是使用代理,但目前没有针对java的html2canvas。如果您绝对需要,您可以构建一个代理 如果您感兴趣,请选择其他解决方案 伪代码
document.documentElement.scrollHeight //gives total page height
document.documentElement.clientHeight //gives current screen height
//You can write ur logic ex : if scroll height is greater than client height scroll
if(document.documentElement.scrollHeight>document.documentElement.clientHeight)
//take screenshot and then scroll(Do this till the end of the page)
}
最后,将所有屏幕截图合并到一个图像文件中
希望这对您有所帮助…如果您有任何疑问,请返回。您可以使用以下内容。
但您必须处理一些等待,直到加载所有图像。
它可以选择跳过重复的元素,因为flipkart的标题搜索横幅是重复的,所以我将其作为要隐藏的元素传递
driver.get("http://www.flipkart.com");
WebDriverWait wait = new WebDriverWait(driver, 60);
wait.until(ExpectedConditions.visibilityOfElementLocated(By.xpath("//div[contains(@class,'fk-ui-ccarousel-supercontainer requirecss-HPS')]")));
WebElement header = driver.findElement(By.id("fk-header"));
//As header is repeating we are giving it as repetitive element so that it will remove it while taking screenshot
Files.copy(Utils.makeFullScreenshot(driver, header), new File("D:\\fsile.png"));
Utils.Java这是GalenFramework的一个修改
导入java.awt.Graphics2D;
导入java.awt.image.buffereImage;
导入java.io.ByteArrayInputStream;
导入java.io.File;
导入java.io.IOException;
导入javax.imageio.imageio;
导入org.openqa.selenium.JavascriptExecutor;
导入org.openqa.selenium.OutputType;
导入org.openqa.selenium.TakesScreenshot;
导入org.openqa.selenium.WebDriver;
导入org.openqa.selenium.WebElement;
公共类UTIL{
私有静态最终字符串JS_RETRIEVE_DEVICE_PIXEL_RATIO=“var pr=window.devicePixelRatio;if(pr!=undefined&&pr!=null)返回pr;else返回1.0;”;
私有静态void hideScroll(WebDriver驱动程序){
((JavascriptExecutor)driver).executeScript(“document.documentElement.style.overflow='hidden';”;
}
私有静态无效显示滚动(WebDriver驱动程序){
((JavascriptExecutor)driver).executeScript(“document.documentElement.style.overflow='visible';”;
}
私有静态void showHideElements(WebDriver驱动程序、布尔隐藏、WebElement…skipElements){
字符串显示;
如果(隐藏){
display=“无”;
}否则{
display=“block”;
}
如果(skipElements!=null){
for(WebElement skipElement:skipElements){
((JavascriptExecutor)driver).executeScript(“参数[0].style.display='”+display+“;”,skipElement);
}
}
}
私有静态字节[]获取屏幕截图(WebDriver驱动程序){
return((TakesScreenshot)driver.getScreenshotAs(OutputType.BYTES);
}
//执行此任务的代码
公共静态文件makeFullScreenshot(WebDriver驱动程序、WebElement…skipElements)引发IOException、InterruptedException{
//滚动到底部以确保所有元素都正确加载
//滚动垂直至(驱动程序,(内部)长滚动高度);
//首先向上滚动开始拍摄屏幕截图
滚动到(驱动程序,0);
hideScroll(司机);
//首次尝试时无需隐藏元素
字节[]字节=getScreenShot(驱动程序);
showHideElements(驾驶员、真实、滑雪装备);
long longScrollHeight=(long)((JavascriptExecutor)驱动程序).executeScript(“返回数学.max(”
+document.body.scrollHeight,document.documentElement.scrollHeight
+document.body.offsetHeight,document.documentElement.offsetHeight
+document.body.clientHeight,document.documentElement.clientHeight)
);
BuffereImage image=ImageIO.read(新的ByteArrayInputStream(字节));
int capturedWidth=image.getWidth();
int capturedHeight=image.getHeight();
Double devicePixelRatio=((数字)((JavascriptExecutor)驱动程序).executeScript(JS_检索_设备_像素_比率)).doubleValue();
int scrollHeight=(int)longScrollHeight;
File File=File.createTempFile(“屏幕截图”、“.png”);
int adapted capturedHeight=(int)((双)capturedHeight)/devicePixelRatio;
缓冲图像结果图像;
if(数学abs(自适应CapturedHeight-滚动高度)>40){
int scrollOffset=适配CapturedHeight;
整数倍=滚动高度/自适应捕获高度;
int leftover=滚动高度%adaptedCapturedHeight;
最终BuffereImage TileImage=新的BuffereImage(capturedWidth,(int)((双)滚动高度)*设备像素比率),BuffereImage.TYPE_int_RGB);
Graphics2D g2dTile=tileImage.createGraphics();
g2dTile.drawImage(image,0,0,null);
int-scroll=0;
对于(int i=0;i<乘以-1;i++){
滚动+=滚动偏移量;
scrollVerticallyTo(驱动程序,滚动);
BuffereImage nextImage=ImageIO.read(新的ByteArrayInputStream(获取屏幕截图(驱动程序));
g2dTile.drawImage(下一个图像,0,(i+1)*capturedHeight,null);
}
如果(剩余>0){
滚动+=滚动偏移量;
scrollVerticallyTo(驱动程序,滚动);
BuffereImage nextImage=ImageIO.read(新的ByteArrayInputStream(获取屏幕截图(驱动程序));
日分
import java.awt.Graphics2D;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import org.openqa.selenium.JavascriptExecutor;
import org.openqa.selenium.OutputType;
import org.openqa.selenium.TakesScreenshot;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
public class Utils {
private static final String JS_RETRIEVE_DEVICE_PIXEL_RATIO = "var pr = window.devicePixelRatio; if (pr != undefined && pr != null)return pr; else return 1.0;";
private static void hideScroll(WebDriver driver) {
((JavascriptExecutor) driver).executeScript("document.documentElement.style.overflow = 'hidden';");
}
private static void showScroll(WebDriver driver) {
((JavascriptExecutor) driver).executeScript("document.documentElement.style.overflow = 'visible';");
}
private static void showHideElements(WebDriver driver, Boolean hide, WebElement... skipElements) {
String display;
if (hide) {
display = "none";
} else {
display = "block";
}
if (skipElements != null) {
for (WebElement skipElement : skipElements) {
((JavascriptExecutor) driver).executeScript("arguments[0].style.display = '" + display + "';", skipElement);
}
}
}
private static byte[] getScreenShot(WebDriver driver) {
return ((TakesScreenshot) driver).getScreenshotAs(OutputType.BYTES);
}
//The code that does the job
public static File makeFullScreenshot(WebDriver driver, WebElement... skipElements) throws IOException, InterruptedException {
//Scroll to bottom to make sure all elements loaded correctly
// scrollVerticallyTo(driver, (int) longScrollHeight);
// scroll up first to start taking screenshots
scrollVerticallyTo(driver, 0);
hideScroll(driver);
//No need to hide elements for first attempt
byte[] bytes = getScreenShot(driver);
showHideElements(driver, true, skipElements);
long longScrollHeight = (Long) ((JavascriptExecutor) driver).executeScript("return Math.max("
+ "document.body.scrollHeight, document.documentElement.scrollHeight,"
+ "document.body.offsetHeight, document.documentElement.offsetHeight,"
+ "document.body.clientHeight, document.documentElement.clientHeight);"
);
BufferedImage image = ImageIO.read(new ByteArrayInputStream(bytes));
int capturedWidth = image.getWidth();
int capturedHeight = image.getHeight();
Double devicePixelRatio = ((Number) ((JavascriptExecutor) driver).executeScript(JS_RETRIEVE_DEVICE_PIXEL_RATIO)).doubleValue();
int scrollHeight = (int) longScrollHeight;
File file = File.createTempFile("screenshot", ".png");
int adaptedCapturedHeight = (int) (((double) capturedHeight) / devicePixelRatio);
BufferedImage resultingImage;
if (Math.abs(adaptedCapturedHeight - scrollHeight) > 40) {
int scrollOffset = adaptedCapturedHeight;
int times = scrollHeight / adaptedCapturedHeight;
int leftover = scrollHeight % adaptedCapturedHeight;
final BufferedImage tiledImage = new BufferedImage(capturedWidth, (int) (((double) scrollHeight) * devicePixelRatio), BufferedImage.TYPE_INT_RGB);
Graphics2D g2dTile = tiledImage.createGraphics();
g2dTile.drawImage(image, 0, 0, null);
int scroll = 0;
for (int i = 0; i < times - 1; i++) {
scroll += scrollOffset;
scrollVerticallyTo(driver, scroll);
BufferedImage nextImage = ImageIO.read(new ByteArrayInputStream(getScreenShot(driver)));
g2dTile.drawImage(nextImage, 0, (i + 1) * capturedHeight, null);
}
if (leftover > 0) {
scroll += scrollOffset;
scrollVerticallyTo(driver, scroll);
BufferedImage nextImage = ImageIO.read(new ByteArrayInputStream(getScreenShot(driver)));
BufferedImage lastPart = nextImage.getSubimage(0, nextImage.getHeight() - (int) (((double) leftover) * devicePixelRatio), nextImage.getWidth(), leftover);
g2dTile.drawImage(lastPart, 0, times * capturedHeight, null);
}
scrollVerticallyTo(driver, 0);
resultingImage = tiledImage;
} else {
resultingImage = image;
}
showScroll(driver);
showHideElements(driver, false, skipElements);
ImageIO.write(resultingImage, "png", file);
return file;
}
private static void scrollVerticallyTo(WebDriver driver, int scroll) {
((JavascriptExecutor) driver).executeScript("window.scrollTo(0, " + scroll + ");");
try {
waitUntilItIsScrolledToPosition(driver, scroll);
} catch (InterruptedException e) {
// LOG.trace("Interrupt error during scrolling occurred.", e);
}
}
private static void waitUntilItIsScrolledToPosition(WebDriver driver, int scrollPosition) throws InterruptedException {
int hardTime = 0;//SCREENSHOT_FULLPAGE_SCROLLWAIT
if (hardTime > 0) {
Thread.sleep(hardTime);
}
int time = 250;//SCREENSHOT_FULLPAGE_SCROLLTIMEOUT
boolean isScrolledToPosition = false;
while (time >= 0 && !isScrolledToPosition) {
Thread.sleep(50);
time -= 50;
isScrolledToPosition = Math.abs(obtainVerticalScrollPosition(driver) - scrollPosition) < 3;
}
}
private static int obtainVerticalScrollPosition(WebDriver driver) {
Long scrollLong = (Long) ((JavascriptExecutor) driver).executeScript("return (window.pageYOffset !== undefined) ? window.pageYOffset : (document.documentElement || document.body.parentNode || document.body).scrollTop;");
return scrollLong.intValue();
}
}