In -depth understanding of the technical principles of the Swagger UI framework in the Java class library

In -depth understanding of the technical principles of the Swagger UI framework in the Java class library Swagger is an open source framework for designing, constructing, documentation, and web services that use RESTFUL -style.Among them, Swagger UI is an important part of the Swagger framework. It provides an interactive visualization interface that allows developers to more easily view and test the function of API. Swagger UI's technical principles can be divided into two aspects: the generation of API documents and the display of visual interface. First of all, to generate API documents, the Swagger UI uses some key annotations in the Java library.Developers can use Swagger annotations to describe the metadata of API, including the path of API, requesting methods, pitching and data type data types.Swagger annotations can be integrated with frameworks such as Spring MVC or JAX-RS (Java API for Restful Web Services) in Java, thereby automatically generating the documentation of API.The following is a simple code example: @RestController @RequestMapping("/api") @API (tags = {"User Management"}) public class UserController { @APIPERATION ("Get user list") @GetMapping("/users") public List<User> getUsers() { // Obtain the business logic of the user list } @APIPERATION ("Create User") @PostMapping("/users") public void createUser(@RequestBody User user) { // Create users' business logic } } In the above examples, `@restController` and@requestMapping` are annotations in the Spring MVC framework, which is used to define the access path of the API.`@API` and`@APIPERATION `are Swagger annotations to describe meta data of API.When the application starts, the Swagger framework analyzes these annotations and generates API documents based on its description. Secondly, in the display of the visual interface, the Swagger UI can be displayed by converting the API document into HTML format and using a beautiful set of interface templates.When the developer visits the Swagger UI interface, it will load HTML resources and display the content of the API document on the interface.Developers can interact with Swagger UI browsing and testing APIs. In addition to the above basic functions, the Swagger UI also provides other advanced features, such as modular UI components, custom themes, API debugging tools, etc. to improve the readability and development efficiency of the API documentation. In summary, the technical principles of the Swagger UI framework in the Java library mainly include the visual interface for generating API documents and displaying API documents based on Swagger annotations.By using the Swagger UI, developers can more easily design, build, test, test and document RESTFUL -style web services.