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Jayrock: JSON and JSON-RPC for .NET

mojoPortal 项目中使用Joyrock和MagicAjaxNET,他没有使用Asp.net ajax ,是因为mojoPortal是一个运行在Windows的 .net framework或Linux,Mac OS的Mono平台上的cms系统,asp.net ajax 的协议决定了它不能应用于mono上。Joyrock的具体应用可以去看mojoPortal 的最新版本的代码。

Joyrock是一个LGPL的开源的软件,实现了JSON和JSON-RPC,支持微软ASP.NET框架。

看看服务器端的写法:
<%@ WebHandler Class="JayrockWeb.HelloWorld" %>

namespace JayrockWeb
{
    using System;
    using System.Web;
    using Jayrock.Json;
    using Jayrock.JsonRpc;
    using Jayrock.JsonRpc.Web;

    public class HelloWorld : JsonRpcHandler
    {
        [ JsonRpcMethod("greetings") ]
        public string Greetings()
        {
            return "Welcome to Jayrock!";
        }
    }
}
[ JsonRpcMethod("greetings") ]恰好对应于ASP.NET 的[WebMethod],深入理解一下就知道,这两个自定义属性就是起到标记作用,用来声明方法是可以远程调用的。

客户端调用:
 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
    "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
<head>
    <title>Hello Jayrock</title>
    <script type="text/javascript" src="json.js"></script>
    <script type="text/javascript" src="helloworld.ashx?proxy"></script>
    <script type="text/javascript">
/* <![CDATA[ */

window.onload = function()
{
    var s = new HelloWorld();

    alert("sync:" + s.greetings());

    s.greetings(function(response) {
      alert("async:" + response.result)
    });
}

/* ]]> */
    </script>
</head>
<body>
    <p>This page tests the HelloWorld service with Jayrock.</p>
</body>

可以看到helloworld.ashx?proxy指向了一个JS文件,他的内容就是:
// This JavaScript was automatically generated by
// Jayrock.Json.Rpc.Web.JsonRpcProxyGenerator, Jayrock, Version=0.9.7507.0, Culture=neutral, PublicKeyToken=null
// on 2006年12月5日 at 8:46:27 (中国标准时间)

// Proxy version 1.0

function HelloWorld(url)
{
    /* Returns a summary about the JSON-RPC server implementation for display purposes. */
   
    this["system.about"] = function(callback)
    {
        return call("system.about", [ ], callback);
    }
   
    /* Returns the version JSON-RPC server implementation using the major, minor, build and revision format. */
   
    this["system.version"] = function(callback)
    {
        return call("system.version", [ ], callback);
    }
   
    /* Returns an array of method names implemented by this service. */
   
    this["system.listMethods"] = function(callback)
    {
        return call("system.listMethods", [ ], callback);
    }
   
    this["greetings"] = function(callback)
    {
        return call("greetings", [ ], callback);
    }
   
    var url = typeof(url) === 'string' ? url : 'http://localhost:3409/Web/HelloWorld.ashx';
    var self = this;
    var nextId = 0;

    function call(method, params, callback)
    {
        var request = { id : nextId++, method : method, params : params };
        return callback == null ?
            callSync(method, request) : callAsync(method, request, callback);
    }

    function callSync(method, request)
    {
        var http = newHTTP();
        http.open('POST', url, false, self.httpUserName, self.httpPassword);
        setupHeaders(http, method);
        http.send(JSON.stringify(request));
        if (http.status != 200)
            throw { message : http.status + ' ' + http.statusText, toString : function() { return message; } };
        var response = JSON.eval(http.responseText);
        if (response.error != null) throw response.error;
        return response.result;
    }

    function callAsync(method, request, callback)
    {
        var http = newHTTP();
        http.open('POST', url, true, self.httpUserName, self.httpPassword);
        setupHeaders(http, method);
        http.onreadystatechange = function() { http_onreadystatechange(http, callback); }
        http.send(JSON.stringify(request));
        return request.id;
    }

    function setupHeaders(http, method)
    {
        http.setRequestHeader('Content-Type', 'text/plain; charset=utf-8');
        http.setRequestHeader('X-JSON-RPC', method);
    }

    function http_onreadystatechange(sender, callback)
    {
        if (sender.readyState == /* complete */ 4)
        {
            var response = sender.status == 200 ?
                JSON.eval(sender.responseText) : {};
           
            response.xmlHTTP = sender;
               
            callback(response);
        }
    }

    function newHTTP()
    {
        return typeof(ActiveXObject) === 'function' ?
            new ActiveXObject('Microsoft.XMLHTTP') : /* IE 5 */
            new XMLHttpRequest(); /* Safari 1.2, Mozilla 1.0/Firefox, and Netscape 7 */
    }
}

HelloWorld.rpcMethods = ["system.about","system.version","system.listMethods","greetings"];
上面JS文档是自动生成的,ASP.NET AJAX也有自动生成客户端访问对象的功能

Jayrock 远程方法要求写在一个ashx中,页面请求这个ashx的时候,在ProcessRequest 中根据Request对象中的参数信息,确定请求的服务器端方法名称和参数,然后进行调用,并返回结果。

posted @ 2007-07-01 19:38  张善友  阅读(7513)  评论(4编辑  收藏  举报