Explore the technical design principle of the Javax JWS API framework in the Java library

Javax JWS (Java Web Services) API framework is one of the key components used in the Java class library to develop and deploy Web services.This framework provides a method of simplified and standardized, enabling developers to create an interactable web service based on Simple Object Access Protocol. The technical design principle of the API framework covers the following key aspects: 1. SOAP protocol: The Javax JWS API framework is based on the SOAP protocol, which is a lightweight protocol for exchangeing the structured information about Web services.Through SOAP, developers can realize remote process calls (RPC) between different operating systems and programming languages. 2. Note: The Javax JWS API framework uses annotations to simplify the development and deployment of Web services.Developers can indicate how to expose them to Web services by adding specific annotations to the Java class and methods. 3. Code generation: The Javax JWS API framework uses the reflection function provided by Java to analyze the annotation and the Java class, and generates the corresponding web service code.The framework will generate WSDL (Web Services Description Language, Web Service Description Language) file according to the annotation parameter, which describes the interface and message of the web service. 4. Deployment and release: Javax JWS API framework supports the deployment of the generated web service to the Java application server, such as Apache Tomcat.After deployment, developers can access and use it by calling the URL of the web service. Below is a basic example code and related configuration, showing how to use the Javax JWS API framework to create and deploy a simple web service. First, create a Java class that contains methods that need to be exposed to web services: import javax.jws.WebMethod; import javax.jws.WebService; @WebService public class HelloWorldService { @WebMethod public String sayHello(String name) { return "Hello, " + name + "!"; } } In the above examples, we used the `@webservice` and@webmedhod` annotations to indicate that the class and the method should be exposed as a web service. Next, you need to specify the relevant deployment configuration in the configuration file.Create a `sun-jaxws.xml` file, and add the following content to it: <?xml version="1.0" encoding="UTF-8"?> <endpoints xmlns="http://java.sun.com/xml/ns/jax-ws/ri/runtime" version="2.0"> <endpoint name="HelloWorldService" implementation="com.example.HelloWorldService" url-pattern="/hello"/> </endpoints> In the above configuration, we designate the name, implementation class and URL mode of the web service. Finally, the compiled Java class and configuration files are deployed on the Java application server.After starting the server, the web service will be released on the specified URL. By visiting the `http:// localhost: 8080/Hello`, you will be able to access the web service with a web browser or other HTTP client. To sum up, the Javax JWS API framework provides a simplified and standardized method to create and deploy web services by using the SOAP protocol, annotation and code generation mechanism.Developers can use the annotation to indicate how to handle the Java class and methods, and release Web services by deploying to the Java application server, so as to achieve easy development and interoperability web service solutions.