Web Services：Apache XML-RPC

【魄爺】

XML-RPC（http://ws.apache.org/xmlrpc/ ）的全称是XML Remote Procedure Call，即XML远 程方法 调 用。是JAVA 实现 的XML-RPC。  
  
    这种远程过程调用使用http作为传输协议，XML作为传送信息的编码格式。Xml-Rpc的定义尽

XML-RPC（http://ws.apache.org/xmlrpc/ ）的全称是XML Remote Procedure Call，即XML远 程方法 调 用。是JAVA 实现 的XML-RPC。        这种远程过程调用使用http作为传输协议，XML作为传送信息的编码格式。Xml-Rpc的定义尽可能的保持了简单，但同时能够传送、处理、返回复杂的数据结构。   　　XML-RPC是工作在Internet上的远程过程调用协议。一个XML-RPC消息就是一个请求体为xml的http-post请求，被调用的方法在服务器端执行并将执行结果以xml格式编码后返回。   ■All primitive Java types are supported, including long, byte, short, and double. ■Calendar objects are supported. In particular, timezone settings, and milliseconds may be sent. ■DOM nodes, or JAXB objects, can be transmitted. So are objects implementing the java.io.Serializable interface. ■Both server and client can operate in a streaming mode, which preserves resources much better than the default mode, which is based on large internal byte arrays.      概念图如下：       http://edu.codepub.com/uploadfile/2009/1001/20091001071311441.jpg   和RMI类似，需要服务器类和客户端类。还需要配置web.xml.   服务器类代码片段：  package org.apache.xmlrpc.demo.webserver;     import java.net.InetAddress;   import org.apache.xmlrpc.common.TypeConverterFactoryImpl;   import org.apache.xmlrpc.demo.webserver.proxy.impls.AdderImpl;   import org.apache.xmlrpc.server.PropertyHandlerMapping;   import org.apache.xmlrpc.server.XmlRpcServer;   import org.apache.xmlrpc.server.XmlRpcServerConfigImpl;   import org.apache.xmlrpc.webserver.WebServer;     public class Server {       private static final int port = 8080;         public static void main(String[] args) throws Exception {           WebServer webServer = new WebServer(port);                  XmlRpcServer xmlRpcServer = webServer.getXmlRpcServer();                    PropertyHandlerMapping phm = new PropertyHandlerMapping();           /* Load handler definitions from a property file.            * The property file might look like:            *   Calculator=org.apache.xmlrpc.demo.Calculator            *   org.apache.xmlrpc.demo.proxy.Adder=org.apache.xmlrpc.demo.proxy.AdderImpl            */             phm.load(Thread.currentThread().getContextClassLoader(),"MyHandlers.properties");           /* You may also provide the handler classes directly,            * like this:            * phm.addHandler("Calculator",            *     org.apache.xmlrpc.demo.Calculator.class);            * phm.addHandler(org.apache.xmlrpc.demo.proxy.Adder.class.getName(),            *     org.apache.xmlrpc.demo.proxy.AdderImpl.class);            */           xmlRpcServer.setHandlerMapping(phm);             XmlRpcServerConfigImpl serverConfig =                 (XmlRpcServerConfigImpl) xmlRpcServer.getConfig();           serverConfig.setEnabledForExtensions(true);           serverConfig.setContentLengthOptional(false);           webServer.start();       }   }   web.xml配置片段： <servlet>         <servlet-name>XmlRpcServlet</servlet-name>         <servlet-class>org.apache.xmlrpc.webserver.XmlRpcServlet</servlet-class>         <init-param>           <param-name>enabledForExtensions</param-name>           <param-value>true</param-value>           <description>             Sets, whether the servlet supports vendor extensions for XML-RPC.           </description>         </init-param>     </servlet>     <servlet-mapping>         <servlet-name>XmlRpcServlet</servlet-name>         <url-pattern>/xmlrpc</url-pattern>     </servlet-mapping>   客户端代码片段：  package web.service.xml.rpc;   import java.net.MalformedURLException; import java.net.URL; import org.apache.xmlrpc.XmlRpcException; import org.apache.xmlrpc.client.XmlRpcClient; import org.apache.xmlrpc.client.XmlRpcClientConfigImpl; import org.apache.xmlrpc.client.XmlRpcCommonsTransportFactory; import org.apache.xmlrpc.client.util.ClientFactory;   public class Client {       public static void main(String[] args) throws Exception {         // create configuration         XmlRpcClientConfigImpl config = new XmlRpcClientConfigImpl();         config.setServerURL(new URL("http://127.0.0.1:8080/xmlrpc"));         config.setEnabledForExtensions(true);            config.setConnectionTimeout(60 * 1000);         config.setReplyTimeout(60 * 1000);         XmlRpcClient client = new XmlRpcClient();           // use Commons HttpClient as transport         client.setTransportFactory(             new XmlRpcCommonsTransportFactory(client));           // set configuration         client.setConfig(config);           // make the a regular call         Object[] params = new Object[]             { new Integer(2), new Integer(3) };         Integer result = (Integer) client.execute("calculator_test.add", params);         System.out.println("2 + 3 = " + result);     } }   这里的calculator_test.add关键字是在MyHandlers.properties中配置的。add是方法名。 配置例子：calculator_test=web.service.xml.rpc.Calculator   Calculator类定义如下： package web.service.xml.rpc;   public class Calculator {       public int add(int i1, int i2) {             return i1 + i2;     }     public int subtract(int i1, int i2) {             return i1 - i2;     } }

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