1.伪代码，大概其是这个意思。

@Component
public class StaticDemo {
    @Resource
    TestService testService;
    
    private static StaticDemo staticDemo; 
    
    @PostConstruct  
    public void init() {  
        staticDemo = this;  
    }

    private static void testMethod() {
        staticDemo.testService.xxx();
    }
}