@SpringBootApplication 是 @Configuration, @EnableAutoConfiguration 跟 @ComponentScan 的集合。

			
@SpringBootApplication
			
			

				
@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)				
				
				

exclude 排除配置，下面例子是排除 DataSource配置

			
@EnableAutoConfiguration(exclude={DataSourceAutoConfiguration.class})
			
			

@ComponentScan 注入會掃瞄 @Controller 與 @RestController

			
@ComponentScan
@ComponentScan({"cn.netkiller.controller"})
@ComponentScan({"cn.netkiller.controller", "cn.netkiller.rest"})
			
			

			
@EntityScan("common.domain")
			
			

掃瞄 Jpa 倉庫

			
@EnableJpaRepositories("common.domain")			
			
			

			
	public @Bean Filter characterEncodingFilter() {
		CharacterEncodingFilter characterEncodingFilter = new CharacterEncodingFilter();
		characterEncodingFilter.setEncoding("UTF-8");
		characterEncodingFilter.setForceEncoding(true);
		return characterEncodingFilter;
	}			
			
			

隱藏 Spring Boot Banner

			
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.3.1.RELEASE)
			
			

			
public static void main(String[] args) {
    SpringApplication app = new SpringApplication(Application.class);
    app.setShowBanner(false);
    app.run(args);
}
			
			

			
@EntityScan(basePackages = { "cn.netkiller.model" }) 
@EnableJpaRepositories(basePackages = { "cn.netkiller.repository" })			
			
			

			
package cn.netkiller;

import java.util.Arrays;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.data.mongodb.repository.config.EnableMongoRepositories;
import org.springframework.scheduling.annotation.EnableScheduling;

@SpringBootApplication
@EnableAutoConfiguration
@ComponentScan
@EnableMongoRepositories
@EnableJpaRepositories
@EnableScheduling
public class Application {

	public static void main(String[] args) {
		//SpringApplication.run(Application.class, args);

		ApplicationContext ctx = SpringApplication.run(Application.class, args);

		System.out.println("Let's inspect the beans provided by Spring Boot:");

		String[] beanNames = ctx.getBeanDefinitionNames();
		Arrays.sort(beanNames);
		for (String beanName : beanNames) {
			System.out.println(beanName);
		}

	}
}
			
			

		
@Configuration
public class TomcatConfiguration implements EmbeddedServletContainerCustomizer {

	int ports[] = { 8080, 8081, 8082 };

	@Override
	public void customize(ConfigurableEmbeddedServletContainer configurableEmbeddedServletContainer) {

		if (ports != null) {
			// 判斷如果是Tomcat才進行如下配置
			if (configurableEmbeddedServletContainer instanceof TomcatEmbeddedServletContainerFactory) {

				TomcatEmbeddedServletContainerFactory tomcat = (TomcatEmbeddedServletContainerFactory) configurableEmbeddedServletContainer;

				for (int port : ports) {
					// 一個Connecter監聽一個連接埠,指定協議為HTTP/1.1
					Connector httpConnector = new Connector("HTTP/1.1");
					httpConnector.setPort(port);
					tomcat.addAdditionalTomcatConnectors(httpConnector);
				}

			}
		}
	}
}
		
			

			
public static void main(String[] args) {
    SpringApplication.run(Backend.class,
        "--spring.application.name=backend",
        "--server.port=9000"
    );
  }			
			
			

			
在 Java 代碼中激活 profile

直接指定環境變數來激活 profile：

System.setProperty("spring.profiles.active", "test");

在 Spring 容器中激活 profile：

AnnotationConfigApplicationContext ctx = new AnnotationConfigApplicationContext();
ctx.getEnvironment().setActiveProfiles("development");
ctx.register(SomeConfig.class, StandaloneDataConfig.class, JndiDataConfig.class);
ctx.refresh();