Play WS framework Java class library introduction and application
The WS (Web Services) framework is a XML -based web service protocol that can be used to implement communication and data exchange between heterogeneous systems.It provides a set of standardized specifications that enable systems with different platforms and different languages to easily communicate and collaborate with each other.
In Java, the WS framework is mainly composed of two parts: JAX-WS (Java API for XML Web Services) and JAX-RS (Java API For Restful Web Services) implemented by a third-party library Apache CXF.
JAX-WS is part of Java Ee (Enterprise Edition), which provides a simple and standard way to build and deploy Web services.Through JAX-WS, developers can use annotations or manually writing WSDL files to define the WebService interface, and communicate through SIAP (Simple Object Access Protocol) protocol.JAX-WS provides some core classes and annotations, such as@WebService,@WebMethod,@Webparam, etc., to define and expose WebService interfaces.Developers only need to write business logic code to publish the Java class to WebService for other system calls.
JAX-RS is another part of Java Ee, which provides a WEB service implementation method based on HTTP-based RESTFUL-style.Through JAX-RS, developers can use annotations to define resources, resource paths and HTTP methods, and communicate through the HTTP protocol.JAX-RS provides some core categories and annotations, such as@Path,@Get,@Post,@Produces,@Consumes, etc., to define and expose the Restful API.By writing business logic code, developers can publish the Java class as RESTFUL services for client calls.
The following is an example that shows how to write a simple WebService interface and a RESTFUL API with JAX-WS and JAX-RS frameworks::
// Define the WebService interface with JAX-WS
import javax.jws.WebService;
@WebService
public interface HelloWorld {
String sayHello(String name);
}
// Implement the WebService interface
import javax.jws.WebService;
@WebService(endpointInterface = "com.example.HelloWorld")
public class HelloWorldImpl implements HelloWorld {
public String sayHello(String name) {
return "Hello " + name + "!";
}
}
// Define the RESTFUL API with JAX-RS
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
@Path("/hello")
public class HelloResource {
@GET
@Produces(MediaType.TEXT_PLAIN)
public String sayHello() {
return "Hello World!";
}
}
When using the WS framework, you also need to configure related dependencies and deployment documents.For example, when using JAX-WS, you need to add dependencies to JAX-WS API and implementation in the configuration file of the project; when using JAX-RS, you need to configure the server to support JAX-RS and add the right to the project to the project.JAX-RS API and dependency items.
In summary, the WS framework is a web service protocol for realizing communication and data exchange between different systems.Through JAX-WS and JAX-RS, developers can easily build and deploy Web services to achieve cross-language and cross-platform system integration and interoperability.
