selenium 页面截图并保存

import java.io.File;
import java.io.IOException;
import org.apache.commons.io.FileUtils;
import org.openqa.selenium.OutputType;
import org.openqa.selenium.TakesScreenshot;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;

public static void main(String[] args) throws InterruptedException, IOException {
        //定义一个前缀文件夹
        String prefix="D:/test";
        WebDriver dr = new FirefoxDriver();
        String url = "http://www.cnblogs.com/";
        dr.get(url);
        Thread.sleep(3000);
        //截图
        File screenShotFile =((TakesScreenshot)dr).getScreenshotAs(OutputType.FILE);
        //文件命名
        File file = new File(prefix+File.separator+System.currentTimeMillis()+".png");
        File tempDir = new File(prefix);
        //判断根目录文件夹是否存在
        if  (!tempDir .exists()  || !tempDir .isDirectory()){
            tempDir .mkdir();
        }
        else{
            int i=1;
            while(file.exists()){
                //命名重复就后缀加_1
                file = new File(prefix+File.separator+System.currentTimeMillis()+"_"+i+".png");
            }
        }
        //输出
        FileUtils.copyFile(screenShotFile, file);
    }