如何在运行时切换 spring 配置文件

Question

我有 spring 带有配置文件的启动应用程序。现在我想在运行时切换配置文件，刷新 spring 上下文并继续执行应用程序。如何在运行时切换活动配置文件（switchEnvironment 方法）？

@SpringBootApplication
public class Application implements CommandLineRunner {

    @Autowired
    private Config config;

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

    @Override
    public void run(String ... strings) throws Exception {
        System.out.printf("Application is running in %s environment, service parameters below:\n",
                getEnvProperty("spring.profiles.active").toUpperCase());
        printServiceParameters();
        switchEnvironment();
        printServiceParameters();
    }

    private String getEnvProperty(String propertyName) {
        return config.getEnv().getProperty(propertyName);
    }

    private void printServiceParameters() {
        System.out.println(getEnvProperty("service.endpoint"));
    }

    private void switchEnvironment() {
        //todo Switch active profile
    }

}

Config.class

@Configuration
@ConfigurationProperties
public class Config{

    @Autowired
    private ConfigurableEnvironment env;

    public ConfigurableEnvironment getEnv() {
        return env;
    }

    public void setEnv(ConfigurableEnvironment env) {
        this.env = env;
    }

}

Answer 1

为了详细说明其他一些答案，这就是 Netflix Archaius (https://github.com/Netflix/archaius/wiki) 等工具试图解决的问题（动态上下文配置）。据我所知，完成此操作的唯一方法是通过重新启动应用程序来刷新上下文。

Answer 2

所有你需要的，就是将这个方法添加到你的主class，并创建控制器或服务来调用这个方法。

@SpringBootApplication
public class Application {

    private static ConfigurableApplicationContext context;

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

    public static void restart() {

        Thread thread = new Thread(() -> {
            context.close();
            context = SpringApplication.run(Application.class, "--spring.profiles.active=your_profile");
        });

        thread.setDaemon(false);
        thread.start();
    }

}

控制器：

@RestController
public class RestartController {

    @PostMapping("/restart")
    public void restart() {
        Application.restart();
    }
}

如何在运行时切换 spring 配置文件

How to switch spring profile at runtime

java

profile

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spring-boot