介绍
groovy-jsonrpc JSONRPC的JAVA和GROOVY实现，能够将java类（包括groovy脚本）的公有静态方法通过jsonrpc2.0暴露出来。地址：https://github.com/wonder365/groovy-jsonrpc 。
JSONRPC2.0规范（中文版本）：https://github.com/wonder365/groovy-jsonrpc/blob/master/gjsonrpc2/doc/www.jsonrpc.org/specification_cn.html
功能
- 完全实现JSONRPC2.0（参看测试用例）
- 支持动态加载groovy脚本
- 提供工具类：支持jsonrpc的groovyservlet（groovy.jsongrpc.tools.RpcServlet）；提供基于netty的nio jsonrpc网络服务（支持java类和groovy脚本）
- 支持不需要groovy.jar的纯java版本，暴露java类方法给jsonrpc
- 支持params到标准函数参数的转换（转换 "params":[1,2] 供 方法“ int add(int a, int b)” 调用，非jsonrpc规范）
groovy.jsongrpc.handler.UrlHandler
该类支持从指定groovy文件调用方法（所以调用时必须传入url）。样例：
UrlHandler handler = new UrlHandler();
String url = "test/test.groovy";
String req = "{"jsonrpc":"2.0","id":null,"method":"add","params":[1,2]}";
String rsp = handler.call(url, req);
// rsp : {"jsonrpc":"2.0","id":null,"result":3}
// or
byte[] rsp = handler.call(url, byte[]data)
RPC commands
支持调用如下rpc工具命令：
>{"jsonrpc":"2.0","id":null,"method":"rpc.ls"}
<{"jsonrpc":"2.0","id":null,"result":["subtract","getDate","nullf","donotify","notify_sum","sum","adds","fun1arg","add","echo"]}
>{"jsonrpc":"2.0","id":null,"method":"rpc.ll"}
<{"jsonrpc":"2.0","id":null,"result":{"add":'public static int jsonrpc.dynamic.test.add(int,int)',"adds":'public static int jsonrpc.dynamic.test.adds(java.util.List)',"donotify":'public static java.lang.Object jsonrpc.dynamic.test.donotify()',"echo":'public static java.lang.Object jsonrpc.dynamic.test.echo(java.lang.Object)',"fun1arg":'public static java.lang.Object jsonrpc.dynamic.test.fun1arg(int)',"getDate":'public static java.lang.Object jsonrpc.dynamic.test.getDate()',"notify_sum":'public static java.lang.Object jsonrpc.dynamic.test.notify_sum(java.util.List)',"nullf":'public static java.lang.Object jsonrpc.dynamic.test.nullf()',"subtract":'public static int jsonrpc.dynamic.test.subtract(int,int)',"sum":'public static java.lang.Object jsonrpc.dynamic.test.sum(java.util.List)'}}
>{"jsonrpc":"2.0","id":null,"method":"rpc.all"}
<{"jsonrpc":"2.0","id":null,"result":[{"url":"test/test.groovy","classname":"jsonrpc.dynamic.test","isok":true,"compiletime":1363253990140,"failmsg":""}]}
>{"jsonrpc":"2.0","id":null,"method":"rpc.recompile"}
<{"jsonrpc":"2.0","id":null,"result":true}
groovy.jsongrpc.handler.GMapedHandler
与UrlHandler相类似，但是不需要传入文件路径（url），但是需要注册java类或groovy文件，调用时method也要传入相应的前缀。举例: register "java.lang.Math" to "my.math."，可以通过 "my.math.bas" 调用Math.abs by method "my.math.bas"； register "test/test.groovy" to "my.testg."， 可以通过 "my.testg.methodname" 调用 test.groovy 中的方法。
样例
GMapedHandler handler = new GMapedHandler();
// register a groovy script
handler.register("groovyclass.", "test/test.groovy", true);
// register a java class
handler.register("javaclass.", "test.class", false);
// call groovy
String req = "{"jsonrpc":"2.0","id":null,"method":"groovyclass.add","params":[1,2]}";
String rsp = handler.call(req);
// call java
String req = "{"jsonrpc":"2.0","id":null,"method":"javaclass.add","params":[1,2]}";
String rsp = handler.call(req);
RPC commands
>{"jsonrpc":"2.0","id":null,"method":"rpc.register","params":["groovyclass.2","test/test.groovy",true]}
<{"jsonrpc":"2.0","id":null,"result":true}
groovy.jsongrpc.tools.RpcServlet
支持 JSONRPC 的 GroovyServlet， 当 requst.ContentType 包含 "json"时将调用 JSONRPC。（当前只支持UTF-8 encoding，前边的类也是一样）
groovy.jsongrpc.tools.RpcServerG
支持暴露javaclass和groovyclass的NIO服务器，基于netty
来源：oschina
链接：https://my.oschina.net/u/614092/blog/113789