@PostConstruct、@Autowired以及构造函数的执行顺序

结论先行：构造函数 ->@Autowired -> PostConstruct 依次执行

由于项目需要启动时加载一个配置信息，所以想到了用@PostConstruct，如下所示：

@Configuration
public class BUserCenterConfig {@Value("${b.user.url}")public String userCenterUrl;@Value("${b.user.appId}")public String userCenterAppId;@PostConstructpublic void setDefaultConfig() {UserCenterConfig.SetInterfaceUrl(userCenterUrl);UserCenterConfig.SetDefaultAppId(userCenterAppId);}
}

BeanTest.java

@Service
public class BeanTest {@Autowiredprivate BeanTest2 beanTest2;public BeanTest() {System.out.println("this is BeanTest construct. ");}@PostConstructprivate void init() {System.out.println("this is BeanTest init function. ");beanTest2.test2();}
}

BeanTest2.java

@Service
public class BeanTest2 {@PostConstructprivate void init() {System.out.println("this is BeanTest2 init function. ");}public BeanTest2() {System.out.println("this is BeanTest2 construct. ");}void test2() {System.out.println("this is BeanTest2 test2 function. ");}
}

启动项目，输出结果如下：

this is BeanTest construct. 
this is BeanTest2 construct. 
this is BeanTest2 init function. 
this is BeanTest init function. 
this is BeanTest2 test2 function.