How to find broken images in a page using Selenium

package programs;

import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.firefox.FirefoxDriver;

public class findbrokenimages {
static int invalidimg;
static WebDriver driver ;
public static void main(String[] args) {
try {
driver = new FirefoxDriver();
driver.get("http://ruchi-myseleniumblog.blogspot.in");
invalidimg = 0;
List allImages  = driver.findElements(By.tagName("img"));
System.out.println("Total  images are " + allImages.size());
for (int i = 0; i < allImages.size(); i++) {
WebElement img = (WebElement) allImages.get(i);
if (img != null) {
verifyimgActive(img);
}
}

System.out.println("Total invalid images are " + invalidimg);
driver.quit();
} catch (Exception e) {
e.printStackTrace();
System.out.println(e.getMessage());
}
}



public static void verifyimgActive(WebElement img) {
try {
HttpResponse response = new DefaultHttpClient().execute(new HttpGet(img.getAttribute("src")));
   if (response.getStatusLine().getStatusCode() != 200)
invalidimg++;
}
catch (Exception e) {
e.printStackTrace();
}
}
}


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