Learn about the operating mechanism and workflow of the Swagger annotation framework in the Java library

Understand the operating mechanism and workflow of the Swagger annotation framework in the Java class library Swagger is an open source framework for designing, constructing and documentation RESTFUL Web services.It provides a set of annotations that can be directly applied to the Java class to describe various aspects of API, such as resource paths, requests and response data formats, certifications, etc.By using the Swagger annotation, developers can easily generate standardized and readable API documents, and can test and debug the API through the Swagger interface interaction. The workflow of the Swagger annotation is roughly divided into the following steps: 1. Add Swagger Maven dependency First, add Swagger's Maven dependencies to the pom.xml file of the Java project.This will be downloaded and introduced into the Swagger annotation library and its related dependencies. <dependencies> <dependency> <groupId>io.springfox</groupId> <artifactId>springfox-swagger2</artifactId> <version>2.9.2</version> </dependency> <dependency> <groupId>io.springfox</groupId> <artifactId>springfox-swagger-ui</artifactId> <version>2.9.2</version> </dependency> </dependencies> 2. Add Swagger configuration class Next, create a Swagger configuration class in the Java project, which uses Swagger annotations to define all aspects of the API document. @Configuration @EnableSwagger2 public class SwaggerConfig { @Bean public Docket api() { return new Docket(DocumentationType.SWAGGER_2) .select() .apis(RequestHandlerSelectors.basePackage("com.example.controller")) .paths(PathSelectors.any()) .build(); } } In the above code, the @Configuration annotation is used to make this class as a configuration class, and the Swagger is enabled by@Enableswagger2 annotation.Then, create a Docket object called "API" to configure the parameters of Swagger, such as the type of API documentation (here Swagger_2), API package path, etc. 3. Add Swagger annotation Add Swagger annotations to the Java class or method that needs to generate API documents.For example, add @API annotations to the controller class of the Spring MVC to describe the role and description of the controller, and add @APIPIPETION annotation to the controller's request processing method to describe the role and description of the description method. @RestController @RequestMapping("/api") @Api(value = "User Controller", tags = "User API") public class UserController { @ApiOperation(value = "Get user by ID", notes = "Retrieve user information by ID") @GetMapping("/users/{id}") public User getUserById(@PathVariable int id) { // ... } } In the above code, use the @RestController annotation to identify this class as a Spring MVC controller class, and use the @RequestMapping annotation to specify the root URL path of the controller.Then add @API annotations to the controller class to add description information to the controller class.Add @APIPERATION annotations to the request processing method to add description information to this method. 4. Run the project and view the API documentation Finally, start the Java project and access the UI interface of Swagger to view the generated API document.By default, Swagger's UI interface is located in "http:// localhost: 8080/swagger-ui.html".You can see the API information described in the Swagger annotation you added to the Swagger interface, including resource paths, requests and response data formats, certifications, etc. Through the above steps, you can understand the operating mechanism and workflow of the Swagger annotation framework in the Java class library.By using the Swagger annotation, you can easily generate specifications and readable API documents for the RESTFUL Web service, and you can test and debug the API through the Swagger interface interaction.Hope this article can help you!