Thread: What needs to programing java webservice ?

I'm learning java networking and i use Socket to create my server. But I know that some technique and frameworks are used in networking programing, such as pool technique ..... Can anyone help me understand it ! Many thanks for anyone help me !

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thank you !

Creating a Web Service From Java
One way to create a web service application is to start by coding the endpoint in Java. If you are developing your Java web service from scratch or have an existing Java class you wish to expose as a web service, this is the most direct approach.

The Java API for XML Web Services (JAX-WS) 2.0, JSR-224, relies heavily on the use of annotations as specified in A Metadata Facility for the Java Programming Language (JSR-175) and Web Services Metadata for the Java Platform (JSR-181), as well as additional annotations defined by the JAX-WS 2.0 specification.

The web service is written as a normal Java class. Then the class and its exposed methods are annotated with the web service annotations @WebService and @WebMethod. The following code snippet shows an example:

@WebService
public class AddNumbersImpl {
@WebMethod(action="addNumbers")
public int addNumbers(int number1, int number2)
throws AddNumbersException {
if (number1 < 0 || number2 < 0) {
throw new AddNumbersException(
"Negative number cant be added!",
"Numbers: " + number1 + ", " + number2);
}
return number1 + number2;
}
}
When developing a web service from scratch or based on an existing Java class, WSIT features are enabled using a configuration file. That file, wsit-<package>.<service>.xml, is written in WSDL format. An example configuration file can be found in the accompanying samples:

wsit-enabled-fromjava/etc/wsit-fromjava.server.AddNumber-
sImpl.xml
The settings in the wsit-<package>.<service>.xml file are incorporated dynamically by the WSIT run-time into the WSDL it generates for the web service. So when a client requests the web service's WSDL, the run-time embeds any publicly visible policy assertions contained in the wsit-<package>.<service>.xml file into the WSDL. For the example wsit-fromjava.server.AddNumbersImpl.xml in the sample discussed in this tutorial, the Addressing and Reliable Messaging assertions are part of the WSDL as seen by the client.