SpringBoot启动太慢的7个优化技巧

@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        SpringApplication app = new SpringApplication(Application.class);
        app.setApplicationStartup(new BufferingApplicationStartup(2048));
        app.run(args);
    }
}

// 优化前：扫描整个包
@SpringBootApplication
public class Application {}

// 优化后：只扫描需要的包
@SpringBootApplication(scanBasePackages = {
    "com.example.controller",
    "com.example.service",
    "com.example.config"
})
public class Application {}

@SpringBootApplication(exclude = {
    DataSourceAutoConfiguration.class,  // 不用数据库时
    RedisAutoConfiguration.class,        // 不用Redis时
    MongoAutoConfiguration.class,        // 不用MongoDB时
})
public class Application {}

spring:
  autoconfigure:
    exclude:
      - org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration

spring:
  main:
    lazy-initialization: true

mybatis:
  configuration:
    lazy-loading-enabled: true
  mapper-locations: classpath:mapper/*.xml  # 精确指定，不要用**

// 不推荐
@MapperScan("com.example")

// 推荐
@Mapper
public interface UserMapper {}

spring:
  profiles:
    active: dev

---
spring:
  config:
    activate:
      on-profile: dev
      
# 开发环境关闭一些功能
springdoc:
  api-docs:
    enabled: false

management:
  endpoint:
    health:
      show-details: never

java -XX:TieredStopAtLevel=1 \
     -noverify \
     -Dspring.jmx.enabled=false \
     -jar app.jar

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-devtools</artifactId>
    <scope>runtime</scope>
</dependency>

spring:
  main:
    lazy-initialization: true

spring:
  main:
    lazy-initialization: false

spring:
  datasource:
    url: jdbc:mysql://测试环境IP:3306/testdb