XML-RPC的全称是XML Remote Procedure Call，即XML（标准通用标记语言下的一个子集）远程方法调用。它是一套允许运行在不同操作系统、不同环境的程序实现基于Internet过程调用的规范和一系列的实现。这种@L_404_2@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。
基本介绍
XML-RPC是工作在Internet上的
@L_404_2@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。
Request example
Here's an example of an XML-RPC request:
POST /RPC2 HTTP/1.0User-Agent: Frontier/5.1.2 (WinNT)Host: betty.userland.comContent-Type: text/xmlContent-length: 181
<?xml version="1.0"?> <methodCall> <methodName>examples.getStateName</methodName> <params> <param> <value><i4>41</i4></value> </param> </params> </methodCall>
Response example
Here's an example of a response to an XML-RPC request:
HTTP/1.1 200 OKConnection: closeContent-Length: 158Content-Type: text/xmlDate: Fri,17 Jul 1998 19:55:08 GMTServer: UserLand Frontier/5.1.2-WinNT
<?xml version="1.0"?> <methodResponse> <params> <param> <value><string>South Dakota</string></value> </param> </params> </methodResponse>
XML-RPC入门程序
基本做法
管理器类
package xmlRpc;
/**
* @author trier
*
* <b><code>HelloHandler</code></b> is a simple handler than can
* be registered with an XML-RPC server
*/
public class HelloHandler {
public String sayHello(String name){
return "Hello " + name;
}
}
服务器程序将创建的管理器注册到服务器上，并为服务器指明应用程序其他特定的 参数。
服务器类
package xmlRpc;
/**
*
* <b><code>HelloServer</code></b> is a simple XML-RPC server
* that will take the <code>HelloHandler</code> class available
* for XML-PRC calls.
* <o:p
*/
import org.apache.xmlrpc.WebServer;
import org.apache.xmlrpc.XmlRpc;
import java.IOException;
public class HelloServer {
public static void main(String[] args){
if(args.length<1){
System.out.println("Usage: java HelloServer [port]");
System.exit(-1);
}
try{
XmlRpc.setDriver("org.apache.xerces.parsers.SAXParser");
//start the server
System.out.println("Starting XML-RPC Server......");
WebServer server = new WebServer(Integer.parseInt(args[0]));
//register our handler class
server.addHandler("hello",new HelloHandler());
System.out.println("Now accepting requests......");
}catch(ClassNotFoundException e){
System.out.println("Could not locate SAX Driver");
}catch(IOException e){
System.out.println("Could not start server: "+e.getMessage());
}
}
}
客户程序
package xmlRpc;
/**
*
* <b><code>HelloClient</code></b> is a simple XML-RPC client
* that makes an XML-RPC request to <code>HelloServer</code>
*/
import java.i.IOException;
import java.util.Vector;
import org.apache.xmlrpc.XmlRpc;
import org.apache.xmlrpc.XmlRpcClient;
import java.t.MalformedURLException;
import org.apache.xmlrpc.XmlRpcException;
public class HelloClient {
public static void main(String[] args){
if(args.length<1){
System.out.println("Usage: java HelloClient [your name]");
System.exit(-1);
}
try{
//Use the Apache Xereces SAX Driver
XmlRpc.setDriver("org.apache.xerces.parsers.SAXParser");
//Specify the server
XmlRpcClient client = new XmlRpcClient("http://localhost:8585");
//create request
Vector params = new Vector();
params.addElement(args[0]);
//make a request and print the result
String result = (String)client.execute("hello.sayHello",params);
System.out.println("Response from server: "+ result);
}catch(ClassNotFoundException e){
System.out.println("Could not locate SAX Driver");
}catch(MalformedURLException e){
System.out.println("Incorrect URL fro xml-rpc server foramt:"+e.getMessage());
}catch(XmlRpcException e){
System.out.println("XmlRpcException :"+e.getMessage());
}catch(IOException e){
System.out.println("IOException:"+e.getMessage());
}
}
}
