springboot项目启动优化的超强方法详解

# application.properties
spring.main.lazy-initialization=true

// 对特定Bean禁用延迟初始化
@Bean
@Lazy(false)
public CriticalBean criticalBean() {
    return new CriticalBean();
}

@SpringBootApplication(
    scanBasePackages = {"com.your.package.service", "com.your.package.controller"}
)

// 使用@ComponentScan的excludeFilters
@ComponentScan(excludeFilters = {
    @Filter(type = FilterType.REGEX, pattern = "com.external.*"),
    @Filter(type = FilterType.ANNOTATION, classes = Repository.class)
})

java -XX:TieredStopAtLevel=1 \
     -Xverify:none \
     -XX:+AlwaysPreTouch \
     -XX:MetaspaceSize=128m \
     -XX:MaxMetaspaceSize=128m \
     -jar your-app.jar

@SpringBootApplication
public class MyApp {
    public static void main(String[] args) {
        SpringApplication app = new SpringApplication(MyApp.class);
        app.setBannerMode(Banner.Mode.OFF);
        // 打印自动配置报告
        app.setAdditionalProfiles("debug");
        app.run(args);
    }
}

@EnableAutoConfiguration(exclude = {
    DataSourceAutoConfiguration.class,
    HibernateJpaAutoConfiguration.class,
    RabbitAutoConfiguration.class
})

# 使用JDK自带工具
java -verbose:class -jar your-app.jar | grep "loaded"

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
    <exclusions>
        <exclusion>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
        </exclusion>
    </exclusions>
</dependency>

# 在Maven构建中添加Jar索引
<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-jar-plugin</artifactId>
    <configuration>
        <archive>
            <index>true</index>
        </archive>
    </configuration>
</plugin>

@Configuration
public class LazyDataSourceConfig {
    
    @Bean
    @Lazy
    public DataSource dataSource() {
        return DataSourceBuilder.create().build();
    }
}

# HikariCP配置
spring.datasource.hikari.initialization-fail-timeout=30000
spring.datasource.hikari.connection-timeout=5000
spring.datasource.hikari.maximum-pool-size=5

// 使用@PostConstruct确保启动后再初始化
@Bean
public CommandLineRunner initData(MyRepository repo) {
    return args -> {
        // 启动后执行数据操作
    };
}

# 安装GraalVM
gu install native-image

# 构建原生镜像
mvn -Pnative package

# 开发环境使用快速编译
-Dspring.aot.enabled=false -XX:TieredStopAtLevel=1

# 生产环境使用完整优化
-Dspring.aot.enabled=true -XX:TieredStopAtLevel=4