SpringBoot静态函数无法自动注入Bean的原因分析与解决方案

@Component
public class MyUtils {
 
    // 静态变量尝试注入
    @Autowired
    private static MyService myService; // 始终为 null!
 
    // 静态方法尝试使用注入
    public static void doSomething() {
        // 调用 myService 将抛出 NullPointerException
        myService.execute();
    }
}

@Component
public class MyUtils {
 
    private static MyService staticService;
 
    @Autowired
    private MyService instanceService; // 实例变量注入
 
    @PostConstruct
    public void init() {
        // 将实例变量赋值给静态变量
        staticService = instanceService;
    }
 
    public static void doSomething() {
        staticService.execute(); // 现在可安全调用
    }
}

//启动类
@SpringBootApplication
public class mavenjavatospringboot {
    public static ConfigurableApplicationContext applicationContext;
    public static StringRedisTemplate redisTemplate; // 添加静态变量
 
    public static void main(String[] args) {
        applicationContext = SpringApplication.run(mavenjavatospringboot.class, args);
        // 从应用上下文中获取 StringRedisTemplate
        redisTemplate = applicationContext.getBean(StringRedisTemplate.class);
    }
}
 
//service
 
@override
public static void run(){
    StringRedisTemplate redisTemplate = mavenjavatospringboot.redisTemplate;
}

@Component
public class MyUtils {
 
    private static MyService staticService;
 
    // 构造器注入实例
    @Autowired
    public MyUtils(MyService service) {
        staticService = service; // 赋值给静态变量
    }
 
    public static void doSomething() {
        staticService.execute();
    }
}

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