XFire 应用

2008-08-02 14:23:53

介绍:
面向服务架构(SOA，Services-oriented architecture)和Web Services已经变成了当前行业的热点话题。XFire正是在这种情况下产生的。它能够使POJO发布为最少的Web Services，而只需要付出最小化的努力。从而，它使希望使用这项技术的初级开发者的学习曲线变得平缓。同时，由于它兼容最新标准和提供了丰富的API，XFire为高级用户提供了更多的大好机会。
步骤清单:

1、检查Java类的方法和默认构造函数确保为public

　 2、增加XFire servlet相关条目到web.xml中

　 3、创建services.xml，把它放到WEB-INF/classes/META-INF/xfire目录下

　 4、增加XFire和第三方包到你的Web应用的WEB-INF/lib文件夹中

          实际例子:
0. 定义 web.xml
      <servlet>
        <servlet-name>XFireServlet</servlet-name>
        <display-name>XFire Servlet</display-name>
        <servlet-class>org.codehaus.xfire.transport.http.XfireConfigurableServlet
         </servlet-class>
    </servlet><servlet-mapping>
        <servlet-name>XFireServlet</servlet-name>
        <url-pattern>/servlet/XFireServlet/*</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>XFireServlet</servlet-name>
        <url-pattern>/services/*</url-pattern>
    </servlet-mapping>
1. 定义接口

public interface IBankingService {

    public String transferFunds(
        String fromAccount, String toAccount, double amount, String currency);

}

2.定义实现

import java.text.NumberFormat;
import java.text.DecimalFormat;

/** XFire WebServices sample implementation class.
*/
public class BankingService implements IBankingService {

    //Default constructor.
    public BankingService(){
    }

    /** Transfers fund from one account to another.
    */
    public String transferFunds(
        String fromAccount, String toAccount, double amount, String currency){

        String statusMessage = "";

        //Call business objects and other components to get the job done.
        //Then create a status message and return.
        try {
            NumberFormat formatter = new DecimalFormat("###,###,###,###.00");
            statusMessage = "COMPLETED: " + currency + " " + formatter.format(amount)+
            " was successfully transferred from A/C# " + fromAccount + " to A/C# " + toAccount;
        } catch (Exception e){
            statusMessage = "BankingService.transferFunds(): EXCEPTION: " + e.toString();
        }
        return statusMessage;
    }

}

3. 定义 web 描述
<beans xmlns="http://xfire.codehaus.org/config/1.0">

<service>
    <name>Banking</name>
    <namespace>mybank</namespace>
    <serviceClass>com.mybank.xfire.example.IBankingService</serviceClass>
    <implementationClass>com.mybank.xfire.example.BankingService</implementationClass>
</service>

</beans>
4.部署获得WSDL
    WSDL的URL应该是:http://localhost:8080/websvc/services/Banking?wsdl。
5. 开发客户端
//Create a metadata of the service
        Service serviceModel = new ObjectServiceFactory().create(IBankingService.class);
        log.debug("callSoapServiceLocal(): got service model." );

        //Create a proxy for the deployed service
        XFire xfire = XFireFactory.newInstance().getXFire();
        XFireProxyFactory factory = new XFireProxyFactory(xfire);

        String serviceUrl = "http://localhost:8080/websvc/services/Banking";

        IBankingService client = null;
        try {
            client = (IBankingService) factory.create(serviceModel, serviceUrl);
        } catch (MalformedURLException e) {
            log.error("WsClient.callWebService(): EXCEPTION: " + e.toString());
        }

        //Invoke the service
        String serviceResponse = "";
        try {
            serviceResponse = client.transferFunds(fromAccount, toAccount, amount, currency);
       } catch (Exception e){
            log.error("WsClient.callWebService(): EXCEPTION: " + e.toString());
            serviceResponse = e.toString();
        }

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XFire 应用