第一步：编写日志监听器
首先项目依赖肯定得要有 testng 依赖，然后我们在 listener 包中编写监听器类，通过继承 testng 的 TestListenerAdapter 接口，代码如下：

package com.test.testng;

import com.test.testng.TestDemo;
import org.apache.commons.io.FileUtils;
import org.openqa.selenium.OutputType;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.remote.RemoteWebDriver;
import org.testng.ITestContext;
import org.testng.ITestResult;
import org.testng.TestListenerAdapter;

import java.io.File;
import java.io.IOException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class DotTestListener extends TestListenerAdapter {
    
    
    private int m_count = 0;

    /**
     * Start
     * @param tc ITestContext
     */
    @Override
    public void onStart(ITestContext tc) {
    
    
        log(String.format("====================%s Test Start====================", tc.getName()));
    }

    /**
     * 测试开始
     *
     * @param tr ITestResult
     */
    @Override
    public void onTestStart(ITestResult tr) {
    
    
        log(String.format("========%s.%s Test Start========", tr.getInstanceName(), tr.getName()));
    }

    /**
     * Test Failure
     * @param tr ITestResult
     */
    @Override
    public void onTestFailure(ITestResult tr) {
    
    
        log(String.format("========%s.%sTest failure, reason as blew：\n%s========\n", tr.getInstanceName(), tr.getName(), tr.getThrowable()));
        /*
         *出现异常截图
         */
    }

    /**
     * Test Skip
     * @param tr ITestResult
     */
    @Override
    public void onTestSkipped(ITestResult tr) {
    
    
        log(String.format("========%s.%sSkip Test========", tr.getInstanceName(), tr.getName()));
    }

    /**
     * Test Success
     * @param tr ITestResult
     */
    @Override
    public void onTestSuccess(ITestResult tr) {
    
    
        log(String.format("========%s.%sTest Success========", tr.getInstanceName(), tr.getName()));
    }

    /**
     * End
     *
     * @param tc ITestContext
     */
    @Override
    public void onFinish(ITestContext tc) {
    
    
        log(String.format("====================%sTest end====================", tc.getName()));
    }

    private void log(String string) {
    
    
        System.out.print(string);
        if (++m_count % 40 == 0) {
    
    
            System.out.println("");
        }
    }

}

第二步：失败时截图
监听失败时截图，在onTestFailure方法里调用TakeScreenShot方法进行截图，但是ScreenShot类里需要传一个driver进去,使用在定义的新类当中加入getInstance()方法，返回值即为该类的一个对象：
需要在监听类里面定义一个全局静态变量driver

public static WebDriver driver;

在测试类里面将其赋值（在打开了浏览器之后）

new DotTestListener().driver=driver;

if(driver!=null)
    this.TakeScreenShot(driver);

public void TakeScreenShot(WebDriver driver){
    
    

    //获取时间
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy_MM_dd_HH_mm_ss");
    String curTime = sdf.format(new Date());
    //获取类名
    String  curClassName = this.getClass().getName();
    //路径
    String curPath = System.getProperty("user.dir");
    String pngPath = curClassName+"_"+curTime+".png";

    File ScrPng = ((RemoteWebDriver) driver).getScreenshotAs(OutputType.FILE);
    try {
    
    
        //复制内容到指定文件中
        FileUtils.copyFile(ScrPng, new File(curPath+"/"+pngPath));
        log("Screenshot save path: "+curPath+"/"+pngPath);
        //Files.copy(ScrPng,new File(curPath+"/"+pngPath));
    } catch (IOException e) {
    
    
        e.printStackTrace();
    }
}

第三步：加入监听

@Listeners(DotTestListener.class)
public class TestDemo {
    
    
    public WebDriver driver;

    @BeforeTest
    public void init() {
    
    
        String url = "http://www.baidu.com";

        //新建一个浏览器句柄
        driver = new Brower().firefox();
        //driver = (WebDriver) new FirefoxDriver();
        //打开URL
        driver.get(url);
    }

    @Test
    @Parameters("searchWord")
    public void search(String searchWord) throws InterruptedException {
    
    
        //输入搜索字符串
        driver.findElement(By.xpath("//*[@id=\"kw\"]")).sendKeys(searchWord);
        //点击[百度一下]按钮
        driver.findElement(By.xpath("//*[@id=\"su\"]")).click();
        Thread.sleep(2000);
    }

    @Test
    public void verifyLastName() {
    
    
        String m_lastName = "Beust";
        assert "Beust".equals(m_lastName) : "Expected name Beust, for" + m_lastName;
    }

    @Test
    public void verify() {
    
    
        String m_lastName = "Beust1";
        assertEquals("Beust", m_lastName);
    }

    @BeforeMethod
    public void beforeMethod(){
    
    
        System.out.println("beforeMethod");
    }

    @AfterMethod
    public void afterMethod(){
    
    
        System.out.println("afterMethod");
    }

    @BeforeClass
    public void beforeClass(){
    
    
        System.out.println("beforeClass");
    }

    @AfterClass
    public void afterClass(){
    
    
        System.out.println("afterClass");
    }

    @BeforeSuite
    public void beforeSuite(){
    
    
        System.out.println("beforeSuite");
    }

    @AfterSuite
    public void afterSuite(){
    
    
        System.out.println("afterSuite");
    }

    @AfterTest
    public void teardown() {
    
    
        driver.quit();
    }

}

第四步：测试结果