springboot reads Properties

@ConfigurationProperties read custom configuration file

SpringBoot project combat (8): four ways to read properties file

Although @Value is to go to the default configuration, it should be noted that there are
spring.profiles.active=prod|dev
If this switch is used, only the properties under the corresponding configuration file can be read and placed in the application.properties file, it will return empty.

Spring's @PropertySource and @Value annotation examples

@Component(value = "mockConfigTest")
public class MockConfigTest {

    @Value("#{'${server.name}'.split(',')}")
    private List<String> servers;

    @Value("#{'${server.id}'.split(',')}")
    private List <Integer> serverId;
    
    @Value("${server.host:127.0.0.1}")
    private String noProKey;
    
    @Autowired
    private Environment environment;
    
    public void readValues() {
        System.out.println("Services Size : " + servers.size());
        for(String s : servers)
            System.out.println(s);
        System.out.println("ServicesId Size : " + serverId.size());
        for (Integer i: serverId)
            System.out.println(i);
        System.out.println("Server Host : " + noProKey);
        String property = environment.getProperty("server.jdbc");
        System.out.println("Server Jdbc : " + property);        
    }

    public static void main(String[] args) {
        AnnotationConfigApplicationContext annotationConfigApplicationContext = new AnnotationConfigApplicationContext(AppConfigTest.class);
        MockConfigTest mockConfigTest = (MockConfigTest) annotationConfigApplicationContext.getBean("mockConfigTest");
        mockConfigTest.readValues();
    }
}

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