WebDriver应用实例(java)——HTML5的画布元素上进行绘画操作

        目的是能够在HTML5的画布元素上进行绘画操作。

        具体实例：

package cn.om.TestHTML5;

import org.testng.annotations.Test;
import org.testng.annotations.BeforeMethod;
import java.io.File;
import org.apache.commons.io.FileUtils;
import org.openqa.selenium.By;
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;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.testng.annotations.AfterMethod;

public class TestHTML5Canvas {

	WebDriver driver;
	String url;

	@Test
	public void testHTML5Canvas() throws Exception {
		File captureScreenFile = null;
		driver.get(url);
		JavascriptExecutor jsExecutor = (JavascriptExecutor) driver;

		// video对象放在iframe里，要先切换到iframe中，才能定位到video元素
		WebElement iframe = driver.findElement(By.xpath(".//*[@id='result']/iframe"));
		driver.switchTo().frame(iframe);

		/*
		 * 调用JavaScript语句，在画布元素上画一个红色矩形的团 getElementById('myCanvas')语句获取页面上的画布元素
		 * var cxt=c.getContext('2d')设定画布为2d cxt.fillStyle='#FF0000'设定填充色为红色
		 * cxt.fillRect(0,0,150,150);画布上绘制矩形
		 */
		jsExecutor.executeScript("var c=document.getElementById('myCanvas');" + "var cxt=c.getContext('2d');"
				+ "cxt.fillStyle='#FF0000';" + "cxt.fillRect(0,0,150,150);");
		captureScreenFile = ((TakesScreenshot) driver).getScreenshotAs(OutputType.FILE);
		FileUtils.copyFile(captureScreenFile, new File("F:\\workspace\\WebDriver API\\2017-2-23\\canvas.jpg"));

	}

	@BeforeMethod
	public void beforeMethod() {
		System.setProperty("webdriver.firefox.bin", "D:/Mozilla Firefox/firefox.exe");
		driver = new FirefoxDriver();
		url = "http://www.w3school.com.cn/tiy/t.asp?f=html5_canvas_line";

	}

	@AfterMethod
	public void afterMethod() {
		driver.quit();
	}

}