错误:
the method compare(ITestResult, ITestResult) of type new Comparator(){} must override a superclass method
我的代码:
package com.tester.extend.demo;

import com.aventstack.extentreports.ExtentReports;
import com.aventstack.extentreports.ExtentTest;
import com.aventstack.extentreports.ResourceCDN;
import com.aventstack.extentreports.Status;
import com.aventstack.extentreports.model.TestAttribute;
import com.aventstack.extentreports.reporter.ExtentHtmlReporter;
import com.aventstack.extentreports.reporter.configuration.ChartLocation;
import com.aventstack.extentreports.reporter.configuration.Theme;
import org.testng.*;
import org.testng.xml.XmlSuite;

import java.io.File;
import java.util.*;

public class ExtentTestNGIReporterListener implements IReporter {
//生成的路径以及文件名
private static final String OUTPUT_FOLDER = “test-output/”;
private static final String FILE_NAME = “index.html”;

private ExtentReports extent;

@Override
public void generateReport(List<XmlSuite> xmlSuites, List<ISuite> suites, String outputDirectory) {
    init();
    boolean createSuiteNode = false;
    if(suites.size()>1){
        createSuiteNode=true;
    }
    for (ISuite suite : suites) {
        Map<String, ISuiteResult> result = suite.getResults();
        //如果suite里面没有任何用例，直接跳过，不在报告里生成
        if(result.size()==0){
            continue;
        }
        //统计suite下的成功、失败、跳过的总用例数
        int suiteFailSize=0;
        int suitePassSize=0;
        int suiteSkipSize=0;
        ExtentTest suiteTest=null;
        //存在多个suite的情况下，在报告中将同一个一个suite的测试结果归为一类，创建一级节点。
        if(createSuiteNode){
            suiteTest = extent.createTest(suite.getName()).assignCategory(suite.getName());
        }
        boolean createSuiteResultNode = false;
        if(result.size()>1){
            createSuiteResultNode=true;
        }
        for (ISuiteResult r : result.values()) {
            ExtentTest resultNode;
            ITestContext context = r.getTestContext();
            if(createSuiteResultNode){
                //没有创建suite的情况下，将在SuiteResult的创建为一级节点，否则创建为suite的一个子节点。
                if( null == suiteTest){
                    resultNode = extent.createTest(r.getTestContext().getName());
                }else{
                    resultNode = suiteTest.createNode(r.getTestContext().getName());
                }
            }else{
                resultNode = suiteTest;
            }
            if(resultNode != null){
                resultNode.getModel().setName(suite.getName()+" : "+r.getTestContext().getName());
                if(resultNode.getModel().hasCategory()){
                    resultNode.assignCategory(r.getTestContext().getName());
                }else{
                    resultNode.assignCategory(suite.getName(),r.getTestContext().getName());
                }
                resultNode.getModel().setStartTime(r.getTestContext().getStartDate());
                resultNode.getModel().setEndTime(r.getTestContext().getEndDate());
                //统计SuiteResult下的数据
                int passSize = r.getTestContext().getPassedTests().size();
                int failSize = r.getTestContext().getFailedTests().size();
                int skipSize = r.getTestContext().getSkippedTests().size();
                suitePassSize += passSize;
                suiteFailSize += failSize;
                suiteSkipSize += skipSize;
                if(failSize>0){
                    resultNode.getModel().setStatus(Status.FAIL);
                }
                resultNode.getModel().setDescription(String.format("Pass: %s ; Fail: %s ; Skip: %s ;",passSize,failSize,skipSize));
            }
            buildTestNodes(resultNode,context.getFailedTests(), Status.FAIL);
            buildTestNodes(resultNode,context.getSkippedTests(), Status.SKIP);
            buildTestNodes(resultNode,context.getPassedTests(), Status.PASS);
        }
        if(suiteTest!= null){
            suiteTest.getModel().setDescription(String.format("Pass: %s ; Fail: %s ; Skip: %s ;",suitePassSize,suiteFailSize,suiteSkipSize));
            if(suiteFailSize>0){
                suiteTest.getModel().setStatus(Status.FAIL);
            }
        }

    }

// for (String s : Reporter.getOutput()) {
// extent.setTestRunnerOutput(s);
// }

    extent.flush();
}

private void init() {
    //文件夹不存在的话进行创建
    File reportDir= new File(OUTPUT_FOLDER);
    if(!reportDir.exists()&& !reportDir .isDirectory()){
        reportDir.mkdir();
    }
    ExtentHtmlReporter htmlReporter = new ExtentHtmlReporter(OUTPUT_FOLDER + FILE_NAME);
    // 设置静态文件的DNS
    //怎么样解决cdn.rawgit.com访问不了的情况
    htmlReporter.config().setResourceCDN(ResourceCDN.EXTENTREPORTS);

    htmlReporter.config().setDocumentTitle("api自动化测试报告");
    htmlReporter.config().setReportName("api自动化测试报告");
    htmlReporter.config().setChartVisibilityOnOpen(true);
    htmlReporter.config().setTestViewChartLocation(ChartLocation.TOP);
    htmlReporter.config().setTheme(Theme.STANDARD);
    htmlReporter.config().setCSS(".node.level-1  ul{ display:none;} .node.level-1.active ul{display:block;}");
    extent = new ExtentReports();
    extent.attachReporter(htmlReporter);
    extent.setReportUsesManualConfiguration(true);
}

private void buildTestNodes(ExtentTest extenttest, IResultMap tests, Status status) {
    //存在父节点时，获取父节点的标签
    String[] categories=new String[0];
    if(extenttest != null ){
        List<TestAttribute> categoryList = extenttest.getModel().getCategoryContext().getAll();
        categories = new String[categoryList.size()];
        for(int index=0;index<categoryList.size();index++){
            categories[index] = categoryList.get(index).getName();
        }
    }

    ExtentTest test;

    if (tests.size() > 0) {
        //调整用例排序，按时间排序
        Set<ITestResult> treeSet = new TreeSet<ITestResult>(new Comparator<ITestResult>() {
            @Override
            public int compare(ITestResult o1, ITestResult o2) {
                return o1.getStartMillis()<o2.getStartMillis()?-1:1;
            }
        });
        treeSet.addAll(tests.getAllResults());
        for (ITestResult result : treeSet) {
            Object[] parameters = result.getParameters();
            String name="";
            //如果有参数，则使用参数的toString组合代替报告中的name
            for(Object param:parameters){
                name+=param.toString();
            }
            if(name.length()>0){
                if(name.length()>50){
                    name= name.substring(0,49)+"...";
                }
            }else{
                name = result.getMethod().getMethodName();
            }
            if(extenttest==null){
                test = extent.createTest(name);
            }else{
                //作为子节点进行创建时，设置同父节点的标签一致，便于报告检索。
                test = extenttest.createNode(name).assignCategory(categories);
            }
            //test.getModel().setDescription(description.toString());
            //test = extent.createTest(result.getMethod().getMethodName());
            for (String group : result.getMethod().getGroups())
                test.assignCategory(group);

            List<String> outputList = Reporter.getOutput(result);
            for(String output:outputList){
                //将用例的log输出报告中
                test.debug(output);
            }
            if (result.getThrowable() != null) {
                test.log(status, result.getThrowable());
            }
            else {
                test.log(status, "Test " + status.toString().toLowerCase() + "ed");
            }

            test.getModel().setStartTime(getTime(result.getStartMillis()));
            test.getModel().setEndTime(getTime(result.getEndMillis()));
        }
    }
}

private Date getTime(long millis) {
    Calendar calendar = Calendar.getInstance();
    calendar.setTimeInMillis(millis);
    return calendar.getTime();
}

}