要对静态变量进行注入

@Resource
private static ITecharchService techarchService;//注入为空,spring注解注入不支持静态变量注入

查资料找到可以这样注入

@Component //必须是组件，才可以用@PostConstruct

public class DDUtils{

@Resource
private ITecharchService techarchService;


private static DDUtils dd;


@PostConstruct
public void init() {
  dd = this;
  dd.techarchService= this.techarchService;
}

public void getA(){

  //调用

  dd.techarchService.getA();

}

}

spring 对静态变量进行注解