一、远程过程调用RPC

XML-RPC is a Remote Procedure Call method that uses XML passed via HTTP as a transport. With it, a client can call methods with parameters on a remote server (the server is named by a URI) and get back structured data. This module supports writing XML-RPC client code; it handles all the details of translating between conformable Python objects and XML on the wire.

简单地，client可以调用server上提供的方法，然后得到执行的结果。类似与webservice。

推荐查看xmlprc的源文件：C:\\Python31\\Lib\\xmlrpc

二、实例

1） Server

复制代码 代码如下:

from xmlrpc.server import SimpleXMLRPCServer
from xmlrpc.server import SimpleXMLRPCRequestHandler

def div(x,y):
    return x – y
   
class Math:
    def _listMethods(self):
        # this method must be present for system.listMethods
        # to work
        return [\’add\’, \’pow\’]
    def _methodHelp(self, method):
        # this method must be present for system.methodHelp
        # to work
        if method == \’add\’:
            return \”add(2,3) => 5\”
        elif method == \’pow\’:
            return \”pow(x, y[, z]) => number\”
        else:
            # By convention, return empty
            # string if no help is available
            return \”\”
    def _dispatch(self, method, params):
        if method == \’pow\’:
            return pow(*params)
        elif method == \’add\’:
            return params[0] + params[1]
        else:
            raise \’bad method\’

server = SimpleXMLRPCServer((\”localhost\”, 8000))
server.register_introspection_functions()
server.register_function(div,\”div\”)
server.register_function(lambda x,y: x*y, \’multiply\’)
server.register_instance(Math())
server.serve_forever()

2）client

复制代码 代码如下:

import xmlrpc.client

s = xmlrpc.client.ServerProxy(\’http://localhost:8000\’)

print(s.system.listMethods())

print(s.pow(2,3))  # Returns 28
print(s.add(2,3))  # Returns 5
print(s.div(3,2))  # Returns 1
print(s.multiply(4,5)) # Returns 20

3）result