读取SpringBoot中的环境变量

import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

@Component
public class EnvironmentConfig {

    @Value("${MY_ENV_VARIABLE}")
    private String myEnvVariable;

    public String getMyEnvVariable() {
        return myEnvVariable;
    }
}

import org.springframework.core.env.Environment;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
public class EnvironmentConfig {

    @Autowired
    private Environment env;

    public String getMyEnvVariable() {
        return env.getProperty("MY_ENV_VARIABLE");
    }
}

import javax.annotation.PostConstruct;
import org.springframework.stereotype.Component;

@Component
public class EnvironmentConfig {

    @Value("${MY_ENV_VARIABLE}")
    private String myEnvVariable;

    @PostConstruct
    public void init() {
        System.out.println("MY_ENV_VARIABLE: " + myEnvVariable);
    }
}