In -depth understanding of the technical principles of the Javax JWS API framework in the Java class library
In -depth understanding of the technical principles of the Javax JWS API framework in the Java class library
introduce:
Java Web Services (JWS) API is an important technology in the Java class library. It provides developers with a simple and easy -to -use way to create and use Web services.This article will in -depth analysis of the technical principles of the Javax JWS API framework, including its working principles, related code and configuration to help readers better understand and apply this technology.
Technical principle of Javax JWS API framework:
The technical principles of the Javax JWS API framework can be divided into the following important aspects:
1. Core concept:
The core concept of the Javax JWS API framework is to mark the Java class and methods by using Java annotations to make it have the characteristics of web services.Common annotations include@WebService,@Webmethod,@Webparam, etc.Among them,@WebService annotations are used to identify a class as a web service,@webmethod annotation to identify a method of a method as a web service,@WebParam annotation is used to identify parameters and return values.
2. Configure file:
The Javax JWS API framework uses a configuration file called "sun-jaxws.xml" to define and configure Web services.This file contains some important elements, such as service names, service ports, naming space, etc.Through configuration files, developers can flexibly define and manage Web services.
3. Server implementation:
On the server, developers need to create a Java class and use the @WebService annotation to identify this class as a web service.By defining different methods in this class, various operations of Web services can be achieved.Use the @WebmedHod annotation to identify the method as a web service operation.
4. Client use:
On the client, developers can use the Javax JWS API to call Web services through the Java code.First of all, you need to generate client code with a tool provided by JAX-WS. You can use the WSIMPORT command line tool or integrated development environment.The generated client code can create a service agent, using the web service by calling the object.
Full code and configuration file example:
1. Server implementation:
import javax.jws.WebService;
@WebService
public class HelloWorld {
public String sayHello(String name) {
return "Hello, " + name + "!";
}
}
2. Configure file (Sun-JAXWS.XML):
<endpoints xmlns="http://java.sun.com/xml/ns/jax-ws/ri/runtime" version="2.0">
<endpoint name="HelloWorld" implementation="com.example.HelloWorld" url-pattern="/hello" />
</endpoints>
3. Client use:
import com.example.HelloWorld;
import javax.xml.namespace.QName;
import javax.xml.ws.Service;
import java.net.URL;
public class HelloWorldClient {
public static void main(String[] args) throws Exception {
URL url = new URL("http://localhost:8080/HelloWorld?wsdl");
QName qname = new QName("http://example.com/", "HelloWorld");
Service service = Service.create(url, qname);
HelloWorld hello = service.getPort(HelloWorld.class);
String response = hello.sayHello("John");
System.out.println(response);
}
}
Summarize:
Javax JWS API is a powerful technology in the Java class library that enables developers to easily create and use Web services.In this article, we have deeply analyzed the technical principles of the Javax JWS API framework, including the implementation example of core concepts, configuration files and server/clients.Through in -depth understanding, readers can better apply and expand the Javax JWS API to achieve a variety of complex web services.
