JSON-RPC轻量级远程调用协议介绍及使用
这个项目能够帮助开发人员利用Java编程语言轻松实现JSON-RPC远程调用。jsonrpc4j使用Jackson类库实现Java对象与JSON对象之间的相互转换。jsonrpc4j包含一个JSON-RPC服务器,支持Stream与HTTP(GET与POST),同时还提供一个支持Stream的JSON-RPC客户端。此外还提供一个HTTP客户端、Spring Service Provider和Spring Service Consumer。
https://github.com/briandilley/jsonrpc4j (包下载)
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JSON-RPC轻量级远程调用协议介绍及使用
目录
技术简介
json-rpc是基于json的跨语言远程调用协议,比xml-rpc、webservice等基于文本的协议传输数据格小;相对hessian、java-rpc等二进制协议便于调试、实现、扩展,是非常优秀的一种远程调用协议。目前主流语言都已有json-rpc的实现框架,java语言中较好的json-rpc实现框架有jsonrpc4j、jpoxy、json-rpc。三者之中jsonrpc4j既可独立使用,又可与spring无缝集合,比较适合于基于spring的项目开发。
一、JSON-RPC协议描述
json-rpc协议非常简单,发起远程调用时向服务端传输数据格式如下:
{ "method": "sayHello", "params": ["Hello JSON-RPC"], "id": 1}
参数说明:
method: 调用的方法名
params: 方法传入的参数,若无参数则传入 []
id : 调用标识符,用于标示一次远程调用过程
服务器其收到调用请求,处理方法调用,将方法效用结果效应给调用方;返回数据格式:
{
"result": "Hello JSON-RPC",
"error": null,
"id": 1
}
参数说明:
result: 方法返回值,若无返回值,则返回null。若调用错误,返回null。
error :调用时错误,无错误返回null。
id : 调用标识符,与调用方传入的标识符一致。
以上就是json-rpc协议规范,非常简单,小巧,便于各种语言实现。
二、JSON-RPC简单示例
2.1、服务器端Java调用示例
jsonrpc4j服务器端java示例:
public class HelloWorldServlet extends HttpServlet {
private static final long serialVersionUID = 3638336826344504848L;
private JsonRpcServer rpcService = null;
@Override
public void init(ServletConfig config) throws ServletException {
super.init(config);
rpcService = new JsonRpcServer(new HelloWorldService(), HelloWorldService.class);
}
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
rpcService.handle(req, resp);
}
}
2.2、Java客户端调用示例
jsonrpc4j的Java客户端调用示例:
JsonRpcHttpClient client = new JsonRpcHttpClient(
new URL("http://127.0.0.1:8080/index.json"));
Map<String,String> headers = new HashMap<String,String>();
headers.put("name", "剑白");
client.setHeaders(headers);
String properties = client.invoke("getSystemProperties", null, String.class);
System.out.println(properties);
2.3、PHP客户端调用示例
基于json-rpc-php的PHP客户端调用示例:
<?php include(dirname(__FILE__)."/lib/client/JsonRpcClient.php");
$client = new JsonRpcClient("http://10.13.49.234:8080/index.json");
$response = $client->getSystemProperties();
echo $response->result;
?>
2.3、JavaScript客户端调用示例
基于jsonrpcjs的JavaScript客户端调用示例:
var rpc = new jsonrpc.JsonRpc('http://127.0.0.1:8080/index.json');
rpc.call('getSystemProperties', function(result){
alert(result);
});
2.4、直接GET请求进行调用
无需任何客户端,只需手工拼接参数进行远程调用,请求URL如下:
http://127.0.0.1:8080/index.json?method=getSystemProperties&id=3325235235235¶ms=JTViJTVk
参数说明:
method : 方法名
params :调用参数,json的数组格式[], 将参数需先进行url编码,再进行base64编码
id : 调用标识符,任意值。
三、JSON-RPC总结
json-rpc是一种非常轻量级的跨语言远程调用协议,实现及使用简单。仅需几十行代码,即可实现一个远程调用的客户端,方便语言扩展客户端的实现。服务器端有php、java、python、ruby、.net等语言实现,是非常不错的及轻量级的远程调用协议。
参考文档
http://code.google.com/p/jsonrpc4j/
http://json-rpc.org/wiki/implementations
http://en.wikipedia.org/wiki/JSON-RPC
https://github.com/gimmi/jsonrpcjs
http://bitbucket.org/jbg/php-json-rpc
https://github.com/Pozo/json-rpc-php
https://github.com/subutux/json-rpc2php
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一、JSON-RPC-Java简介
JSON-RPC-Java是一个用Java来实现动态JSON-RPC的框架. 利用它内置的一个轻级量JSON-RPC JavaScripIt客户端,可以让你透明地在JavaScript中调用Java代码。JSON-RPC-Java可运行在Servlet容器中如Tomcat也可以运行在JBoss与其它J2EE应用服务器中因此可以在一个基于JavaScript与DHTML的Web应用程序中利用它来直接调用普通Java方法与EJB方法。我们可以很方便的使用JSON-RPC-Java来开发我的们Ajax应用。
二、JSON-RPC-Java实践
1、从http://oss.metaparadigm.com/jsonrpc/download.html下载最新稳定版的JSON-RPC-Java框架并解压。新建一个JavaWeb工程,将jsonrpc-1.0.jar放到/webroot/WEB-INF/lib目录下,将jsonrpc.js放在/webroot下的任意目录下,保证在jsp页面可以引用即可。
2、修改/webroot/WEB-INF/web.xml文件,添加以下代码:
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当然这里代码不一定要和上面一模一样,有一点基础即可看出这里只是添加了一个Servlet配置而,只要符合Servlet的配置规则即可。
3、编Java文件。
Example.java 此文件提供各种业务操作,此方件编写没有什么特别的要求。但为了在JSP页面用标签,我们最好提供一个无参的构造方法。
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User.java 此文件用于自定义数据类型传输数。要求是一个javabean,即要为每一个属性提供set和get方法,还有一个无参的构方法即可。
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4、编写javascript文件。
Example.js 用于此处理客户端操作。
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此文件中的jsonrpc.hello.say*()方法即是在Example.java中定义的。
4、编写jsp页面。
json.jsp 这个文件做什么不用说了吧,当然给用户一个操作的介面了。
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源码下载:JsonRpcExample
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