在 Spring Boot 中读取 MacOs 环境变量

Question

I am trying to set some API credentials in the Spring boot property file "application.property" using environment variables. My environment variables look as such:

export ACCOUNT_SID ="some value"
export AUTH_TOKEN="some value"

Now when I run echo command I get the "some value" for each variable and even when I run a System.getenv("ACCOUNT_SID") in a regular java application. However, when I set the values in the property file, all I get is the strings "${ACCOUNT_SID}" and "${AUTH_TOKEN}" injected into my POJO fields. ie assume the following configuration in my application.property file:

twilio.account_sid=${ACCOUNT_SID}
twilio.auth_token=${AUTH_TOKEN}

Where ACCOUNT_SID and AUTH_TOKEN are my environment variables. Next I set my POJO as such:

@Configuration
@ConfigurationProperties(prefix="twilio")
public class TwilioConfig {
    private String accountSid;
    private String authToken;

    geters/setters
}

When I run this and try to print the values of the fields I get ${ACCOUNT_SID} and ${AUTH_TOKEN} printed in the console. The main java file looks as such.

@SpringBootApplication
public class SmshotlineApplication implements CommandLineRunner {
    @Autowired
    private TwilioConfig twilio;

    @Override
    public void run(String... args) throws Exception {
        // TODO Auto-generated method stub
        System.out.println("ACCOUNT_SID="+twilio.getAccountSid());
        System.out.println("ACCOUNT_SID="+twilio.getAuthToken());
    }

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

I even try injecting the value by using @Value annotation on variables. When I tested using JAVA_HOME environment variable, I actually got to print the path but when I try to do the same with my defined environment variables, the program crashed because the values could not be found. So I had to give a default value which is what gets printed. example below.

@SpringBootApplication
public class SmshotlineApplication implements CommandLineRunner {

    @Value("${java.home}")
    String javaHome;
    @Value("${account.sid:DEFAULT}")
    String ACCOUNT_SID;
    @Value("${auth.token:DEFAULT}")
    String AUTH_TOKEN;

    @Override
    public void run(String... args) throws Exception {
        // TODO Auto-generated method stub
        System.out.println("ACCOUNT_SID="+ACCOUNT_SID);
        System.out.println("ACCOUNT_SID="+AUTH_TOKEN);
        System.out.println("JAVA_HOME="+javaHome);
    }


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

Please help me understand or see what am I doing wrong. If the variables are not being seen by the program, makes me think that I am setting the environment variables wrongly. But at the same time this confuses me because when I use System.getenv() in a regular(not spring boot Java) program, I get to print the values! I am using Mac OS Catalina and my env var are store in my profile file ~/.profile.

Answer 1

You can set the environment properties on ~/.bash_profile. If you are running your app with IntelliJ you can verify the system properties that are included by opening 'Edit Run/Debug configuration' dialog -> Configuration -> Environment Variables -> Click on Browse -> Check Include System Environment Variables (and verify if your variables are in there, if not your environment properties were not included)

Verify in your Intellij Run/debug configuration

Answer 2

The first thing is you should not call the properties in SpringBootApplication class, but you should use @Value from other kind of context. In addition for reading your properties configs from application.properties by using @Value then you should call the property with the same name, I reviewed your code but you are not calling the same property name, for example:

application.properties

twilio.account_sid=${ACCOUNT_SID}
twilio.auth_token=${AUTH_TOKEN}

SmsHotLineApplication class

@Value("${twilio.account_sid:DEFAULT}")
String ACCOUNT_SID;
@Value("${twilio.auth_token:DEFAULT}")
String AUTH_TOKEN;

Then should work, if you want to use the @ConfigurationProperties(prefix="twilio") Then you should call the same how you named your properties, for example:

application.properties

twilio.accountSid=${ACCOUNT_SID}
twilio.authToken=${AUTH_TOKEN}

TwilioConfig class

@Configuration
@ConfigurationProperties(prefix="twilio")
public class TwilioConfig {
    private String accountSid;
    private String authToken;

    geters/setters
}