@Component
public class MyUtils {
 
    // 靜態(tài)變量嘗試注入
    @Autowired
    private static MyService myService; // 始終為 null!
 
    // 靜態(tài)方法嘗試使用注入
    public static void doSomething() {
        // 調(diào)用 myService 將拋出 NullPointerException
        myService.execute();
    }
}

@Component
public class MyUtils {
 
    private static MyService staticService;
 
    @Autowired
    private MyService instanceService; // 實(shí)例變量注入
 
    @PostConstruct
    public void init() {
        // 將實(shí)例變量賦值給靜態(tài)變量
        staticService = instanceService;
    }
 
    public static void doSomething() {
        staticService.execute(); // 現(xiàn)在可安全調(diào)用
    }
}

//啟動(dòng)類
@SpringBootApplication
public class mavenjavatospringboot {
    public static ConfigurableApplicationContext applicationContext;
    public static StringRedisTemplate redisTemplate; // 添加靜態(tài)變量
 
    public static void main(String[] args) {
        applicationContext = SpringApplication.run(mavenjavatospringboot.class, args);
        // 從應(yīng)用上下文中獲取 StringRedisTemplate
        redisTemplate = applicationContext.getBean(StringRedisTemplate.class);
    }
}
 
//service
 
@override
public static void run(){
    StringRedisTemplate redisTemplate = mavenjavatospringboot.redisTemplate;
}

@Component
public class MyUtils {
 
    private static MyService staticService;
 
    // 構(gòu)造器注入實(shí)例
    @Autowired
    public MyUtils(MyService service) {
        staticService = service; // 賦值給靜態(tài)變量
    }
 
    public static void doSomething() {
        staticService.execute();
    }
}

@Component
public class MyServiceExecutor {
    @Autowired 
    private MyService myService;
    
    public void execute() {
        myService.doSomething();
    }
}