and springboot spring, how to use the automatic injector in the static properties of the method in

The first step: Write notes @Component the current class as a bean object. (@ Controller, @ service will do)

Step Two: Write a static variable

The third step: write a comment @PostConstruct annotation methods annotated In this method, the injection will automatically assign values ​​to the static variables defined

Step Four: static variable substitution used in the automatic injector inside the static method

@Component
public class DSHWechatApiUtil extends DSHBaseController {

    @Autowired
    private IThirdPartyAuthDao thirdPartyAuthDao;

    @Autowired
    private static IThirdPartyAuthDao staticThirdPartyAuthDao;
    
    @PostConstruct
    public void init() {
        staticThirdPartyAuthDao = thirdPartyAuthDao;
    }

    public static JSONObject getAuthorizerToken(String componentAccessToken, String authorizerAppid, String authorizerRefreshToken) {
        JSONObject returnObject = new JSONObject();
        try {
            if (DSHUtils.isEmpty(componentAccessToken)) {
                componentAccessToken = staticThirdPartyAuthDao.selectWechatValue(DSHConstants.WECHAT_PARAMS.COMPONENT_ACCESS_TOKEN);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return returnObject;
    }
}

 

@PostConstruct Notes Role: Java EE 5 annotations is introduced, Spring allows developers to use it in a managed Bean. When the DI container tube Bean is instantiated by the current method @ PostConstruct annotations are automatically triggered to complete some initialization.

note:

 

• Only one way to use this annotation notes;
• Annotated method without any parameters;
• The method is returned annotated void;
• Annotated method must not throw checked exceptions;
• The method is non-static method for an annotated;
• This method will only be executed once;