SpringBootApplication不會自動裝配我的服務

Question

我的Spring Boot初始化時遇到了麻煩。 我在一個簡單的Spring Boot項目中有這個結構。

com.project.name
|----App.java (Annoted with @SpringBootApplication and Autowire MyCustomService)
|----com.project.name.service
     |----MyCustomService.java (Annoted with @Service)

我嘗試在SpringBootApplication Annotation中設置scanBasePackages屬性但不起作用。 無論如何，我有@Bean注釋，我看到Spring Boot在應用程序中正確注入它，因為我可以在運行應用程序時看到日志，如下所示：

2019-03-09 15:23:47.917  INFO 21764 --- [           main] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'jobLauncherTaskExecutor'
...
2019-03-09 15:23:51.775  INFO 21764 --- [       Thread-3] o.s.s.concurrent.ThreadPoolTaskExecutor  : Shutting down ExecutorService 'jobLauncherTaskExecutor'

我的AppClass.java的基本方案

@SpringBootApplication(
        exclude = { DataSourceAutoConfiguration.class }
        //,scanBasePackages  = {"com.project.name.service"}
)

public class App{

    private static Logger logger = LoggerFactory.getLogger(App.class);

    @Autowired
    private static MyCustomService myCustomService;

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

        ...

        myCustomService.anyMethod();//NullPointerException
    }
}

@Bean
public ThreadPoolTaskExecutor jobLauncherTaskExecutor() {
    ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
    executor.setCorePoolSize(10);
    executor.setMaxPoolSize(20);
    executor.setQueueCapacity(25);
    return executor;
}

我想我錯過了一些東西，但我正在閱讀一些指南而且沒有找到任何相關內容。

Answer 1

Spring不能@Autowire靜態字段，使用ApplicationContext來獲取bean

@SpringBootApplication(
    exclude = { DataSourceAutoConfiguration.class }
    //,scanBasePackages  = {"com.project.name.service"}
)

public class App{

    private static Logger logger = LoggerFactory.getLogger(App.class);

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

        MyCustomService myCustomService = (MyCustomService)context.getBean("myCustomService");
        ...

        myCustomService.anyMethod();
    }
}

或者您可以使用CommandLineRunner

 @SpringBootApplication(
    exclude = { DataSourceAutoConfiguration.class }
    //,scanBasePackages  = {"com.project.name.service"}
)

public class App implements CommandLineRunner {

    private static Logger logger = LoggerFactory.getLogger(App.class);

    @Autowired
    private MyCustomService myCustomService;

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

Answer 2

問題已經解決，請看下面的鏈接

為什么我們不能在春天自動裝配靜態字段