Java 백엔드 기능 개발의 성능 테스트 및 최적화를 수행하는 방법은 무엇입니까?

import org.apache.jmeter.engine.StandardJMeterEngine;
import org.apache.jmeter.protocol.http.sampler.HTTPSampler;
import org.apache.jmeter.testelement.TestElement;
import org.apache.jmeter.control.LoopController;
import org.apache.jmeter.threads.ThreadGroup;
import org.apache.jmeter.util.JMeterUtils;
import org.apache.jorphan.collections.HashTree;
 
public class LoadTestExample {
    public static void main(String[] args) throws Exception {
        // 设置JMeter属性
        JMeterUtils.loadJMeterProperties("jmeter.properties");
        JMeterUtils.initLocale();
 
        // 创建JMeter Engine
        StandardJMeterEngine jmeter = new StandardJMeterEngine();
 
        // 创建一个线程组
        ThreadGroup threadGroup = new ThreadGroup();
        threadGroup.setNumThreads(100);
        threadGroup.setRampUp(10);
        threadGroup.setSamplerController(new LoopController());
 
        // 创建HTTP Sampler
        HTTPSampler httpSampler = new HTTPSampler();
        httpSampler.setDomain("example.com");
        httpSampler.setPort(80);
        httpSampler.setPath("/");
        httpSampler.setMethod("GET");
 
        // 创建HashTree
        HashTree testPlanTree = new HashTree();
        testPlanTree.add(testPlanTree.getArray()[0], threadGroup);
        testPlanTree.add(threadGroup, httpSampler);
 
        // 运行测试计划
        jmeter.configure(testPlanTree);
        jmeter.run();
    }
}

> ab -n 1000 -c 100 http://example.com/

import org.ehcache.Cache;
import org.ehcache.CacheManager;
import org.ehcache.config.CacheConfiguration;
import org.ehcache.config.Configuration;
import org.ehcache.config.builders.CacheConfigurationBuilder;
import org.ehcache.config.builders.CacheManagerBuilder;
 
public class CacheExample {
    public static void main(String[] args) {
        // 创建Cache Manager
        Configuration config = CacheConfigurationBuilder.newCacheManagerBuilder()
                .build();
        CacheManager cacheManager = CacheManagerBuilder.newCacheManager(config);
        cacheManager.init();
 
        // 创建Cache
        Cache<String, String> cache = cacheManager.createCache("myCache",
                CacheConfigurationBuilder.newCacheConfigurationBuilder()
                        .buildConfig(String.class, String.class));
 
        // 向Cache中存入数据
        cache.put("key1", "value1");
 
        // 从Cache中获取数据
        String value = cache.get("key1");
        System.out.println(value);
    }
}