Spring Boot 变量约定

Spring Boot 变量约定

java
System.setProperty("myapp.environment", "dev");

java
String environment = System.getProperty("myapp.environment");

bash
export MYAPP_ENVIRONMENT=dev

java
String environment = System.getenv("MYAPP_ENVIRONMENT");

properties
myapp.environment=dev

java
@Value("${myapp.environment}")
private String environment;

java
System.setProperty("mail.server", "smtp.example.com");

bash
export MAIL_SENDER=sender@example.com

properties
mail.sender.name=John Doe

java
@Value("${mail.server}")
private String mailServer;
@Value("${MAIL_SENDER}")
private String mailSender;
@Value("${mail.sender.name}")
private String mailSenderName;
public void sendEmail(String recipient, String subject, String content) {
    // 使用上述变量发送邮件
    // ...
}

java
@SpringBootApplication
public class EmailApplication {
    @Value("${mail.server}")
    private String mailServer;
    @Value("${MAIL_SENDER}")
    private String mailSender;
    @Value("${mail.sender.name}")
    private String mailSenderName;
    public static void main(String[] args) {
        SpringApplication.run(EmailApplication.class, args);
    }
    @GetMapping("/sendEmail")
    public String sendEmail() {
        // 使用上述变量发送邮件
        // ...
        return "Email sent successfully!";
    }
}