Explore the technical principles and applications of the Swagger UI framework in the Java class library

Swagger UI is an open source, dynamic API documentation tool, and is commonly used in the development of the Java class library.It provides a visual interface to display detailed documents and test interfaces used to display APIs.This article will explore the technical principles of the Swagger UI framework in the Java class library and its application in actual development, and provide the corresponding Java code example. 1. Technical principle Swagger UI is mainly based on the following technical principles to achieve the generation and display of API documents: -News and reflex: Swagger UI uses annotations in Java to mark the information of the API interface, such as URL paths, HTTP request methods, parameters, etc.Through the reflection mechanism, the Swagger UI can dynamically analyze the annotation and generate API documents. -JSON and YAML: Swagger UI expresses and stores the API interface information in the format of JSON or YAML, including the path, request method, parameter, return value, etc. of the interface.By analyzing these data, Swagger UI can dynamically generate API documents. -Static resource service: Swagger UI provides a visual interface through static resource services.It stores static resource files such as HTML, CSS, JavaScript and other static resource files on the server, and sends these files to the client during access to display the API document. 2. Application instance Now, let's look at a practical example to demonstrate the application of Swagger UI in the Java library. Suppose we have a simple Java library that contains some API interfaces for mathematical computing.We can use Swagger UI to generate these API documents. First of all, introduce Swagger-related dependencies in our Java library, such as `IO.SWAgger: Swagger-Annotations and` IO.SWAGGER: SWAGGER-MODELS`.Then, we need to add Swagger's annotations to the interface method, such as `@api`,` `@apiopration`,` `@apiparam` and so on. Next, we create a Swagger configuration class to configure some parameters of Swagger, such as the title of the document, the version number, the basic path of the interface, etc.This configuration class needs to inherit the `SwaggerConfig` and implement the` configure` method. The example code is as follows: @Configuration @EnableSwagger2 public class MySwaggerConfig extends SwaggerConfig { @Override public void configure(RequestHandlerSelectors selectors) { // Set the package path of scanning API interface selectors.basePackage("com.example.api"); } @Override public void configure(SwaggerInfo info) { // Set the basic information of the document Info.settital ("Mathematics Computing API Document"); info.setVersion("1.0"); Info.SetDescript ("This is an example of a mathematical computing API document"); } } Finally, add the `@ENABLESWAGGER2` to the startup class of our Spring Boot application, enable Swagger UI, and inject the Swagger configuration class created above.The example code is as follows: @SpringBootApplication @EnableSwagger2 public class MyApp { public static void main(String[] args) { SpringApplication.run(MyApp.class, args); } @Autowired public void configureSwagger(SwaggerConfig config) { SwaggerUIConfig uiConfig = new SwaggerUIConfig(); config.setSwaggerUIConfig(uiConfig); // Other configurations ... } } Now, we can run applications and visit http: // localhost: 8080/swagger-ui.html to view automatic generating API documents. This article explores the technical principles and applications of the Swagger UI framework in the Java class library.By using the Swagger's annotation and configuration, we can easily generate and display the API documentation.This not only improves the readability and testability of the API, but also provides developers with a convenient interactive interface document.