htmlunit javascript性能

Question

我用firefoxdriver和firefox 21对htmlunit进行了对硒
的性能测试.性能测试是在我的windows7机器上通过Eclipse进行的.
当两者都禁用javascript时,性能是相同的.
当两个都打开javascript htmlunit 2.12 比firefox慢150%.
我想这是因为spidermonkey引擎对犀牛的优越性.
有没有办法配置rhino会更快？
有没有更好的方式我们可以加速htmlunit？

package utils;

import java.io.IOException;
import java.net.MalformedURLException;
import java.text.DateFormat;
import java.util.Date;

import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.firefox.FirefoxProfile;

import com.gargoylesoftware.htmlunit.BrowserVersion;
import com.gargoylesoftware.htmlunit.FailingHttpStatusCodeException;
import com.gargoylesoftware.htmlunit.WebClient;
import com.gargoylesoftware.htmlunit.html.HtmlPage;

public class PerformanceTest {
public static void main(String[] args)  {
    String[] urls = new String[] {
...
};
      Date beforeSelenium = new Date();
      System.out.println("Going to run selenium");
      testSelenium(urls);
      Date afterSelenium = new Date();

      Date beforehtmlUnit= new Date();
      System.out.println("Going to run htmlunit");
      testHtmlUnit(urls);
      Date afterhtmlUnit = new Date();

      System.out.println(
                DateFormat.getTimeInstance(DateFormat.LONG).format(beforeSelenium));
      System.out.println(
                DateFormat.getTimeInstance(DateFormat.LONG).format(afterSelenium));
      System.out.println(
                DateFormat.getTimeInstance(DateFormat.LONG).format(beforehtmlUnit));
      System.out.println(
                DateFormat.getTimeInstance(DateFormat.LONG).format(afterhtmlUnit));


}
public static void testSelenium(String[] urls) {
 WebDriver driver = new FirefoxDriver();
 int i=0;
 for(String url:urls) {
     i++;
     System.out.println(i);
     // And now use this to visit Google
     driver.get(url);
     String str = driver.getPageSource();
     System.out.println(str);

 }
 driver.close();
}

public static void testHtmlUnit(String[] urls)  {
WebClient client = new WebClient(BrowserVersion.FIREFOX_17);
client.getOptions().setJavaScriptEnabled(true);
client.getOptions().setRedirectEnabled(true);
client.getOptions().setThrowExceptionOnScriptError(false);
client.getOptions().setCssEnabled(true);
client.getOptions().setUseInsecureSSL(true);
client.getOptions().setThrowExceptionOnFailingStatusCode(false);
int i=0;
 for(String url:urls) {
     i++;
     System.out.println(i);
     // And now use this to visit Google
     HtmlPage page;
    try {
        page = client.getPage(url);
        String str = page.asText();
         System.out.println(str);
    } catch (FailingHttpStatusCodeException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (MalformedURLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }


 }
}

}

Answer 1

HtmlUnit使用经过修改的重新打包的Rhino JavaScript引擎.默认情况下使用解释器模式.您可以启用JavaScript优化.然后JavaScript将编译为Java字节代码.

WebClient webClient = new WebClient();
JavaScriptEngine sriptEngine = webClient.getJavaScriptEngine();
HtmlUnitContextFactory factory = sriptEngine.getContextFactory();
Context context = factory.enterContext();
context.setOptimizationLevel(9);

但这不能加速你的页面.它也可以减慢它.