import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;

@Service
public class AsyncService {

    // 標(biāo)記為異步方法
    @Async
    public void longRunningTask() {
        // 假設(shè)這里有一個長時間運行的任務(wù)
        System.out.println("開始執(zhí)行長時間任務(wù)");
        try {
            Thread.sleep(5000);  // 模擬長時間任務(wù)
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("長時間任務(wù)執(zhí)行完畢");
    }
}

import org.springframework.cache.annotation.Cacheable;
import org.springframework.stereotype.Service;

@Service
public class CacheService {

    // 應(yīng)用緩存
    @Cacheable("data")
    public String getCachedData(String param) {
        // 模擬從數(shù)據(jù)庫或遠(yuǎn)程服務(wù)獲取數(shù)據(jù)
        return "從數(shù)據(jù)庫獲取的數(shù)據(jù)：" + param;
    }
}

import org.springframework.stereotype.Service;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import java.util.List;

@Service
public class DatabaseOptimizationService {

    @PersistenceContext
    private EntityManager entityManager;

    public List<Object> optimizedQuery() {
        Query query = entityManager.createQuery("SELECT field1, field2 FROM MyTable WHERE condition");
        // 這里進(jìn)行了優(yōu)化的查詢
        return query.getResultList();
    }
}

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.zip.GZIPOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

@RestController
public class CompressionController {

    @GetMapping("/compressedData")
    public void getCompressedData(HttpServletResponse response) throws IOException {
        String data = "這是需要被壓縮的大量數(shù)據(jù)...";
        ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream();
        GZIPOutputStream gzipOutputStream = new GZIPOutputStream(byteArrayOutputStream);
        gzipOutputStream.write(data.getBytes());
        gzipOutputStream.close();

        response.addHeader("Content-Encoding", "gzip");
        response.getOutputStream().write(byteArrayOutputStream.toByteArray());
    }
}

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import reactor.core.publisher.Mono;

@RestController
public class WebFluxController {

    @GetMapping("/reactiveData")
    public Mono<String> getReactiveData() {
        // 異步地返回數(shù)據(jù)
        return Mono.just("響應(yīng)式編程的數(shù)據(jù)");
    }
}

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class LoggingController {

    private static final Logger logger = LoggerFactory.getLogger(LoggingController.class);

    @GetMapping("/efficientLogging")
    public String getEfficientLogging() {
        // 只在必要時記錄日志
        if (logger.isInfoEnabled()) {
            logger.info("高效的日志記錄");
        }
        return "日志優(yōu)化示例";
    }
}

CREATE INDEX idx_username ON User(username);

import org.springframework.data.jpa.repository.JpaRepository;

public interface UserRepository extends JpaRepository<User, Long> {
    User findByUsername(String username);
}

spring.datasource.url=jdbc:mysql://localhost:3306/mydb
spring.datasource.username=myuser
spring.datasource.password=mypassword
spring.datasource.hikari.maximum-pool-size=10

<img src="https://your-cdn-url.com/path/to/your/image.jpg" alt="Description">