添加一个框架初始化器，在Springboot初始化阶段中添加一个自定义的环境属性配置

- 添加一个自定义的框架初始化类，实现 ApplicationContextInitializer<ConfigurableApplicationContext> 接口

- 重写 initialize(ConfigurableApplicationContext configurableApplicationContext) 方法

- 获取系统属性 ConfigurableEnvirnoment env = configurableApplicationContext.getEnvironment();

- 添加系统属性 env.getPropertySource().addLast(XXX);

- 加载这个自定义框架初始化类

- 方式一

- 在 /META/spring.factories 中配置 org.springframe.context.ApplicationContextInitializer = 自定义框架初始化器

- 方式二

- 在springApplication.run()前，通过springApplicaiton.addInitializers()方法，自定义框架初始化器

- 方式三

- 在application.properties 中配置 context.initializer.classes = 自定义框架初始化器

@Order(1) // 设置执行顺序

public class FirstInitializer implements ApplicationContextInitializer<ConfigurableApplicationContext> {

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

@Override

public void initialize(ConfigurableApplicationContext configurableApplicationContext) {

// 获取系统属性

ConfigurableEnvironment environment =

configurableApplicationContext.getEnvironment();

// 设置自定义属性

Map<String, Object> attributeMap = new HashMap<>();

attributeMap.put("firstKey", "firstValue");

// 添加自定义属性

MapPropertySource mapPropertySource = new MapPropertySource("firstInitializer", attributeMap);

environment.getPropertySources().addLast(mapPropertySource);

logger.info("设置框架初始化器【ApplicationContextInitializer】成功 : run firstInitializer");

}

}

# 通过系统初始化器，设置自定义环境属性

org.springframework.context.ApplicationContextInitializer=\

com.example.springboot.source.code.analysis.initializer.FirstInitializer

@Order(2) // 设置执行顺序

public class SecondInitializer implements ApplicationContextInitializer<ConfigurableApplicationContext> {

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

@Override

public void initialize(ConfigurableApplicationContext configurableApplicationContext) {

// 获取系统属性

ConfigurableEnvironment environment =

configurableApplicationContext.getEnvironment();

// 设置自定义属性

Map<String, Object> attributeMap = new HashMap<>();

attributeMap.put("secondKey", "secondValue");

// 添加自定义属性

MapPropertySource mapPropertySource = new MapPropertySource("secondInitializer", attributeMap);

environment.getPropertySources().addLast(mapPropertySource);

logger.info("设置框架初始化器【ApplicationContextInitializer】成功 : run secondInitializer");

}

}

public class SpringbootSourceCodeAnalysisApplication {

public static void main(String[] args) {

// SpringApplication.run(SpringbootSourceCodeAnalysisApplication.class, args);

SpringApplication springApplication = new SpringApplication(SpringbootSourceCodeAnalysisApplication.class);

// 手动添加一个框架的初始化器

springApplication.addInitializers(new SecondInitializer());

springApplication.run();

}

}

@Order(3) // 设置执行顺序

public class ThirdInitializer implements ApplicationContextInitializer<ConfigurableApplicationContext> {

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

@Override

public void initialize(ConfigurableApplicationContext configurableApplicationContext) {

// 获取系统属性

ConfigurableEnvironment environment =

configurableApplicationContext.getEnvironment();

// 设置自定义属性

Map<String, Object> attributeMap = new HashMap<>();

attributeMap.put("thirdKey", "thirdValue");

// 添加自定义属性

MapPropertySource mapPropertySource = new MapPropertySource("thirdInitializer", attributeMap);

environment.getPropertySources().addLast(mapPropertySource);

logger.info("设置框架初始化器【ApplicationContextInitializer】成功 : run thirdInitializer");

}

}

# 通过系统初始化器，设置环境属性

context.initializer.classes=\

com.example.springboot.source.code.analysis.initializer.ThirdInitializer