springboot 系统初始化器自定义实现

 springboot 系统初始化器二种自定义实现

第一种：

• 实现ApplicationContextInitalizer接口

@Order(1)
public class FirstInitializer implements ApplicationContextInitializer<ConfigurableApplicationContext> {

    @Override
    public void initialize(ConfigurableApplicationContext configurableApplicationContext) {
        ConfigurableEnvironment environment=configurableApplicationContext.getEnvironment();
        Map<String,Object> map=new HashMap<>();
        map.put("key1","value1");
        MapPropertySource mapPropertySource = new MapPropertySource("firstInitializer", map);
        environment.getPropertySources().addLast(mapPropertySource);
        System.out.println("run firstInitializer");
    }
}

• 在resources下新建META-INF文件夹，新建spring.factories中定义

org.springframework.context.ApplicationContextInitializer=com.example.gogoboot.initializer.FirstInitializer

第二种：

• 实现ApplicationContextInitalizer接口

@Order(1)
public class SecondInitializer implements ApplicationContextInitializer<ConfigurableApplicationContext> {

    @Override
    public void initialize(ConfigurableApplicationContext configurableApplicationContext) {
        ConfigurableEnvironment environment=configurableApplicationContext.getEnvironment();
        Map<String,Object> map=new HashMap<>();
        map.put("key2","value2");
        MapPropertySource mapPropertySource = new MapPropertySource("SecondInitializer", map);
        environment.getPropertySources().addLast(mapPropertySource);
        System.out.println("run SecondInitializer");
    }
}

• 通过SpringApplication类初始化后设置进去

@SpringBootApplication
public class GogoBootApplication {

    public static void main(String[] args) {
//        SpringApplication.run(GogoBootApplication.class, args);
        SpringApplication springApplication = new SpringApplication(GogoBootApplication.class);
        springApplication.addInitializers(new SecondInitializer());
        springApplication.run(args);
    }

}

第三种：

• 实现ApplicationContextInitalizer接口

@Order(1)
public class ThirdInitializer implements ApplicationContextInitializer<ConfigurableApplicationContext> {

    @Override
    public void initialize(ConfigurableApplicationContext configurableApplicationContext) {
        ConfigurableEnvironment environment=configurableApplicationContext.getEnvironment();
        Map<String,Object> map=new HashMap<>();
        map.put("key3","value3");
        MapPropertySource mapPropertySource = new MapPropertySource("ThirdInitializer", map);
        environment.getPropertySources().addLast(mapPropertySource);
        System.out.println("run ThirdInitializer");
    }
}

• 在application.yml种配置如下内容

context:
  initializer:
     classes: com.example.gogoboot.initializer.ThirdInitializer