java利用phantomjs进行截图实例教程

brew install phantomjs

/Users/hetiantian/SoftWares/phantomjs/bin/phantomjs
/Users/hetiantian/SoftWares/phantomjs/examples/rasterize.js
https://juejin.im/post/5bb24bafe51d450e4437fd96
/Users/hetiantian/Desktop/juejin-command.png

"use strict";
var page = require('webpage').create(),
 system = require('system'),
 address, output, size, pageWidth, pageHeight;

if (system.args.length < 3 || system.args.length > 5) {
 console.log('Usage: rasterize.js URL filename [paperwidth*paperheight|paperformat] [zoom]');
 console.log(' paper (pdf output) examples: "5in*7.5in", "10cm*20cm", "A4", "Letter"');
 console.log(' image (png/jpg output) examples: "1920px" entire page, window width 1920px');
 console.log('         "800px*600px" window, clipped to 800x600');
 phantom.exit(1);
} else {
 address = system.args[1];
 output = system.args[2];
 page.viewportSize = { width: 600, height: 600 };
 if (system.args.length > 3 && system.args[2].substr(-4) === ".pdf") {
  size = system.args[3].split('*');
  page.paperSize = size.length === 2 ? { width: size[0], height: size[1], margin: '0px' }
           : { format: system.args[3], orientation: 'portrait', margin: '1cm' };
 } else if (system.args.length > 3 && system.args[3].substr(-2) === "px") {
  size = system.args[3].split('*');
  if (size.length === 2) {
   pageWidth = parseInt(size[0], 10);
   pageHeight = parseInt(size[1], 10);
   page.viewportSize = { width: pageWidth, height: pageHeight };
   page.clipRect = { top: 0, left: 0, width: pageWidth, height: pageHeight };
  } else {
   console.log("size:", system.args[3]);
   pageWidth = parseInt(system.args[3], 10);
   pageHeight = parseInt(pageWidth * 3/4, 10); // it's as good an assumption as any
   console.log ("pageHeight:",pageHeight);
   page.viewportSize = { width: pageWidth, height: pageHeight };
  }
 }
 if (system.args.length > 4) {
  page.zoomFactor = system.args[4];
 }
 page.open(address, function (status) {
  if (status !== 'success') {
   console.log('Unable to load the address!');
   phantom.exit(1);
  } else {
   window.setTimeout(function () {
    page.render(output);
    phantom.exit();
   }, 200);
  }
 });
}

 page.evaluate(function(){
  scrollBy(0, 18000); 
});

  <dependency>
   <groupId>org.seleniumhq.selenium</groupId>
   <artifactId>selenium-java</artifactId>
   <version>2.45.0</version>
  </dependency>

  <dependency>
   <groupId>com.codeborne</groupId>
   <artifactId>phantomjsdriver</artifactId>
   <version>1.2.1</version>
   <!-- this will _always_ be behind -->
   <exclusions>
    <exclusion>
     <groupId>org.seleniumhq.selenium</groupId>
     <artifactId>selenium-java</artifactId>
    </exclusion>
    <exclusion>
     <groupId>org.seleniumhq.selenium</groupId>
     <artifactId>selenium-remote-driver</artifactId>
    </exclusion>
   </exclusions>
  </dependency>

public class PhantomjsTest2 {
 public static void main(String[] args) throws InterruptedException, IOException {
  //设置必要参数
  DesiredCapabilities dcaps = new DesiredCapabilities();
  //ssl证书支持
  dcaps.setCapability("acceptSslCerts", true);
  //截屏支持
  dcaps.setCapability("takesScreenshot", true);
  //css搜索支持
  dcaps.setCapability("cssSelectorsEnabled", true);
  //js支持
  dcaps.setJavascriptEnabled(true);
  //驱动支持（第二参数表明的是你的phantomjs引擎所在的路径）
  dcaps.setCapability(PhantomJSDriverService.PHANTOMJS_EXECUTABLE_PATH_PROPERTY,
    "/Users/hetiantian/SoftWares/phantomjs/bin/phantomjs");
  //创建无界面浏览器对象
  PhantomJSDriver driver = new PhantomJSDriver(dcaps);

  //设置隐性等待（作用于全局）
  driver.manage().timeouts().implicitlyWait(1, TimeUnit.SECONDS);
  long start = System.currentTimeMillis();
  //打开页面
  driver.get("https://juejin.im/post/5bb24bafe51d450e4437fd96");
  Thread.sleep(30 * 1000);
  JavascriptExecutor js = driver;
  for (int i = 0; i < 33; i++) {
   js.executeScript("window.scrollBy(0,1000)");
   //睡眠10s等js加载完成
   Thread.sleep(5 * 1000);
  }
  //指定了OutputType.FILE做为参数传递给getScreenshotAs()方法，其含义是将截取的屏幕以文件形式返回。
  File srcFile = ((TakesScreenshot)driver).getScreenshotAs(OutputType.FILE);
  Thread.sleep(3000);
  //利用FileUtils工具类的copyFile()方法保存getScreenshotAs()返回的文件对象
  FileUtils.copyFile(srcFile, new File("/Users/hetiantian/Desktop/juejin-01.png"));
  System.out.println("耗时：" + (System.currentTimeMillis() - start) + " 毫秒");
 }
}