WebServiceServletEndpointSupport

Spring对WebService的支持 
Spring使用ServletEndpointSupport来暴露WebService。假设有如下接口： 

//业务接口 

public interface Hello 

{ 

    public String hello(String name); 

} 

以及如下的实现类： 

//实现类，实现上面的业务接口 

public class  HelloImpl implements Hello 

{ 

         //实现业务接口必须实现的方法 

    public String hello(String name) 

    { 

           return name + "你好，欢迎学习Spring和Axis"; 

    } 

} 

上面是非常简单的面向接口编程的应用结构，一个接口以及对应的实现类。如果需要将该实现类暴露成WebService，则编写一个WebService类，让该类实现Hello接口，并继承ServletEndpointSupport类。该类的源代码如下： 

//实现Hello接口，继承ServletEndpointSupport工具类 

public class HelloEndpoint extends ServletEndpointSupport implements Hello 

{ 

         //将真实的业务bean包装成WebService 

    private Hello h; 

         //该方法由Spring调用，将目标业务bean注入。 

      protected void onInit() 

    { 

           this.h = (Hello) getWebApplicationContext().getBean("hello"); 

    } 

         //将业务bean的业务方法暴露成WebService 

    public String hello(String name) 

     { 

           return h.hello(name); 

    } 

} 

然后提供Spring的配置文件，配置文件中部署业务bean，配置文件如下： 

<?xml version="1.0" encoding="UTF-8"?> 

<!--  Spring 配置文件的文件头，包含DTD等信息--> 

<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" 

    "http://www.springframework.org/dtd/spring-beans.dtd"> 

<!--  Spring配置文件的根元素--> 

<beans> 

         <!--  配置Spring的业务bean--> 

    <bean id="hello" class="lee.HelloImpl"/> 

</beans> 

然后修改web.xml文件，让AxisServlet拦截某些请求，这是Axis必需的。web.xml的详细配置如下： 

<?xml version="1.0" encoding="ISO-8859-1"?> 

<!--  Web应用配置文件的文件头,包含dtd等信息--> 

<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD WebApplication 2.3//EN" 

"http://java.sun.com/dtd/web-app_2_3.dtd"> 

<!--  Web应用配置文件的根元素--> 

<web-app> 

         <!--  用于初始化ApplicationContext的listener--> 

         <listener> 

                   <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> 

         </listener> 

      <!--  定义AxisServlet--> 

    <servlet> 

           <servlet-name>AxisServlet</servlet-name> 

           <servlet-class>org.apache.axis.transport.http.AxisServlet</servlet-class> 

    </servlet> 

         <!--  映射AxisServlet,使用通配符--> 

         <servlet-mapping> 

                   <servlet-name>AxisServlet</servlet-name> 

                   <url-pattern>/axis/*</url-pattern> 

         </servlet-mapping> 

</web-app> 

配置文件中，看到所有匹配/axis/*模式的请求都由AxisServlet处理。即：Spring发布的WebService都在axis下。然后编写wsdl文件，或者使用工具生成。wsdl文件如下： 

<?xml version="1.0" encoding="UTF-8"?> 

<!--  wsdl的根元素，包含schema等信息--> 

<deployment xmlns="http://xml.apache.org/axis/wsdd/" 

xmlns:java="http://xml.apache.org/axis/wsdd/providers/java"> 

<!--  wsdl的全局配置--> 

         <globalConfiguration> 

                   <parameter name="adminPassword" value="admin"/> 

                   <parameter name="sendXsiTypes" value="true"/> 

                   <parameter name="sendMultiRefs" value="true"/> 

                   <parameter name="sendXMLDeclaration" value="true"/> 

                   <parameter name="axis.sendMinimizedElements" value="true"/> 

                   <requestFlow> 

                            <handler type="java:org.apache.axis.handlers.JWSHandler"> 

                                     <parameter name="scope" value="session"/> 

                            </handler> 

                            <handler type="java:org.apache.axis.handlers.JWSHandler"> 

                                     <parameter name="scope" value="request"/> 

                                     <parameter name="extension" value=".jwr"/> 

                            </handler> 

                   </requestFlow> 

         </globalConfiguration> 

         <handler name="Authenticate" type="java:org.apache.axis.handlers.SimpleAuthenticationHandler"/> 

         <handler name="LocalResponder" type="java:org.apache.axis.transport.local.LocalResponder"/> 

         <handler name="URLMapper" type="java:org.apache.axis.handlers.http.URLMapper"/> 

         <!--  定义WebService的管理台--> 

         <service name="AdminService" provider="java:MSG"> 

                   <parameter name="allowedMethods" value="AdminService"/> 

                   <parameter name="enableRemoteAdmin" value="false"/> 

                   <parameter name="className" value="org.apache.axis.utils.Admin"/> 

                   <namespace>http://xml.apache.org/axis/wsdd/</namespace> 

         </service> 

         <!--  定义自己的WebService--> 

         <service name="HelloService" provider="java:RPC"> 

                   <parameter name="allowedMethods" value="*"/> 

                   <!--  定义WebService的实现类--> 

                   <parameter name="className" value="lee.HelloEndpoint"/> 

         </service> 

         <!--  定义WebSerivice的系统服务。--> 

         <service name="Version" provider="java:RPC"> 

                   <parameter name="allowedMethods" value="getVersion"/> 

                   <parameter name="className" value="org.apache.axis.Version"/> 

         </service> 

         <transport name="http"> 

                   <requestFlow> 

                            <handler type="URLMapper"/> 

                            <handler type="java:org.apache.axis.handlers.http.HTTPAuthHandler"/> 

                   </requestFlow> 

         </transport> 

         <transport name="local"> 

                   <responseFlow> 

                            <handler type="LocalResponder"/> 

                   </responseFlow> 

         </transport> 

</deployment> 

经过这些步骤，可将部署在Spring的普通bean发布成WebService。