Introduction to the technical principles of the Javax JWS API framework in the Java class library

Introduction to the technical principles of Javax JWS API framework The Javax JWS (Java Web Services) API framework is a group of APIs for creating, deploying and running Java applications based on Web services.JWS provides a simple and powerful way to build a cross -platform distributed application, making communication between different operating systems and programming languages easier. The technical principles of the JWS framework mainly include the following aspects: 1. Web service description language (WSDL): JWS API uses WSDL to describe and define the interface, operation and message format of the web service.WSDL provides a way that has nothing to do with operating systems, programming languages, and network protocols to describe the detailed information of the web service, which makes communication between different platforms more convenient. 2. Note: JWS API uses Java annotations to identify and configure all aspects of Web services.By adding specific annotations to the code, developers can specify the endpoint URL, operation method, parameter type and other information of the web service.The annotation makes the code more concise and readable, and it also provides flexible configuration options. The following is an example code that demonstrates how to use JWS API to create a simple web service: import javax.jws.WebMethod; import javax.jws.WebService; @WebService public class HelloWorldService { @WebMethod public String sayHello(String name) { return "Hello, " + name + "!"; } } In the above code, the annotation of `@webservice` indicates that this class is a web service, and`@webmethod` indicate that the method is a remote call operation.By using these annotations, developers can easily convert the Java class and methods into components that can be published as web services. 3. SOAP protocol: JWS API uses simple object access protocol (SOAP) as its default message transmission protocol.SOAP is an XML -based protocol that is used to exchange structured data on the Internet.It encapsulates and parameters into XML messages and transmits it with HTTP or other protocols to achieve cross -platform and cross -language communication. 4. Deployment and release: JWS API provides a convenient way to deploy and release Web services.Developers can use the Java standard deployment description file (DD) to specify the configuration and deployment information of the web service.This information includes the port number of Web services, access control, security settings, etc.By configured DD files, web services can be deployed into various application servers and published to the outside world. The Javax JWS API framework in the Java class library provides developers with a powerful tool for its simple, easy -to -use, flexible and scalable characteristics to build high -efficiency distributed applications.It makes the development, deployment and call of Web services easier and convenient, and provides great convenience for the development of enterprise -level applications.