Ejb暴露WebService

EJB2.1可以将无状态会话Bean暴露为WebService

1.定义WebService服务接口(Endpoint Inteface)，通过标注@WebService来指明这是一个WebService的服务接口，通过标注@WebMethod来指明要暴露的服务方法，@WebMethod是可选的，如果没有指明@WebMethod，则所有方法暴露为WebService服务方法。

package examples.ws;

import javax.jws.WebMethod;
import javax.jws.WebService;

@WebService
public interface HelloWorld {
    @WebMethod
    public String hello();
}

2.实现一个无状态的会话Bean，实现服务接口。通过标注@WebService指明该无状态的会话Bean暴露为WebService，@WebService的属性endpointInterface指明WebService服务接口。

package examples.ws;

import javax.ejb.Stateless;
import javax.jws.WebService;


@WebService(endpointInterface="examples.ws.HelloWorld",serviceName="Greeter",portName="GreeterPort")
@Stateless
public class HelloBean implements HelloWorld {


    public String hello() {
        return "Hello World";
    }
}

3.将上述EJB发布到EJB容器中。EJB容器会生成相应得WSDL文件和WebService.xml，也可以自己提供WSDL文件和WebService.xml，放在EJB-jar的META-INF文件夹下。生成得wsdl文件片段如下：

 <service name="Greeter">
    <port name="GreeterPort" binding="tns:GreeterPortBinding">
      <soap:address location="http://[host]:8080/Greeter/HelloBean" xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/" xmlns:soap12="http://schemas.xmlsoap.org/wsdl/soap12/"/>
    </port>
  </service>

4.客户端代码：

import examples.ws.HelloWorld;
import java.net.URL;
import javax.xml.namespace.QName;
import javax.xml.ws.Service;


public class WebServiceClient {

    static String host = "localhost";
    static String portType = "HelloBean";
    static String serviceName = "Greeter";
    static String serviceEndpointAddress = "http://" + host + ":8080/" + serviceName;
    static String nameSpace = "http://ws.examples/";

    public static void main(String[] args) throws Exception
    {
        URL wsdlLocation = new URL(serviceEndpointAddress + "/" + portType + "?WSDL");
        QName serviceNameQ = new QName(nameSpace, serviceName);
        
        Service service = Service.create(wsdlLocation, serviceNameQ);
        
        HelloWorld client = (HelloWorld)service.getPort(HelloWorld.class);

        System.out.println(client.hello());
    }