Annotation usage meaning

Explain the separation of front and back ends in terms of layers

Backend

XXApplication Layer

• @SpringBootApplication SpringBoot program entry

// The field in brackets after the annotation is the specified package to [email protected](scanBasePackages = "com.zaofeng.good")

• @EnableEurekaClient // Service Provider

• @EnableDiscoveryClient // Service Consumer

The difference between @EnableEurekaClient and @EnableDiscoveryClient

• @EnableFeignClients // enable feign clients
• @MapperScan(basePackages = {"com.zaofeng.good.common.mapper", "com.zaofeng.good.service.digiccy.mapper" }) // Function: specify to changeThe package where the interface of the implementation class is located, and then all interfaces under the package will generate corresponding implementation classes after compilation.Add location: add
above the Springboot startup class

@MapperScan detailed explanation

• @EnableSwagger2 //Indicates enabling Swagger

Mapper (DAO) layer

• @Repository // Spring has introduced some annotations since version 2.0 to simplify the development of Spring.The @Repository annotation was one of the first to be introduced and is used to identify classes in the data access layer (DAO layer) as Spring Beans.Specifically, just mark the annotation on the DAO class.At the same time, in order for Spring to scan the classes in the classpath and recognize the @Repository annotation, it is necessary to enable the automatic scanning of beans in the XML configuration file, which can be achieved through context:component-scan/.

@Repository explained

• @CacheNamespace//Enable L2 cache

@CacheNamespace(implementation = RedisCache.class)

@CacheNamespace details

Service(layer)

impl

• @Service
  @Service Explained

• @Autowired // Establish connection between Servic and Dao (understanding)
  @Autowired Explained

• @Override // Override method
  @Overrid detailed explanation

• @Transactional

@Transactional(readOnly = true) // read only

@Transactional details

Controller (layer)

• @Controller

• @RestController
  The difference between @Controller and @RestController

• @Autowired // Usually related to Service

• @RequestMapping
  Details of @RequestMapping

• @ApiOperation(value = "Exchange List")... // Documentation Comments

@ApiOperation(value = "Exchange List")@ApiImplicitParams({@ApiImplicitParam(name = "pageNum", value = "page number", required = true, dataType = "int", paramType = "path"),@ApiImplicitParam(name = "pageSize", value = "Number of Pens", required = true, dataType = "int", paramType = "path"),@ApiImplicitParam(name = "tbDigiccyExchangeJson", value = "Object JSON format", required = false, dataTypeClass = String.class, paramType = "json")})

Detailed explanation of documentation

before