Erlang与ActionScript3采用JSON格式进行Socket通讯

server.erl 

 -module(server).
 -export([start/0,start/1,process/1]).
 -define(defPort, 8888).

 start() -> start(?defPort).

 start(Port) ->
   case gen_tcp:listen(Port, [binary, {packet, 0}, {active, false}]) of
     {ok, LSock} -> server_loop(LSock);
     {error, Reason} -> exit({Port,Reason})
   end.

 %% main server loop - wait for next connection, spawn child to process it
 server_loop(LSock) ->
   case gen_tcp:accept(LSock) of
     {ok, Sock} ->
       spawn(?MODULE,process,[Sock]),
       server_loop(LSock);
     {error, Reason} ->
       exit({accept,Reason})
   end.

 %% process current connection
 process(Sock) ->
   Req = do_recv(Sock),
   io:format("~p~n", [Req]),
   {ok, D, []} = rfc4627:decode(Req),
   {obj, [{"name", _Name}, {"age", Age}]} = D,
   Name = binary_to_list(_Name),
   io:format("Name: ~p, Age: ~p~n", [Name, Age]),
   Resp = rfc4627:encode({obj, [{"name", 'Hideto2'}, {"age", 24}]}),
   do_send(Sock,Resp),
   gen_tcp:close(Sock).

 %% send a line of text to the socket
 do_send(Sock,Msg) ->
   case gen_tcp:send(Sock, Msg) of
     ok -> ok;
     {error, Reason} -> exit(Reason)
   end.

 %% receive data from the socket
 do_recv(Sock) ->
   case gen_tcp:recv(Sock, 0) of
     {ok, Bin} -> binary_to_list(Bin);
     {error, closed} -> exit(closed);
     {error, Reason} -> exit(Reason)
   end.

Person.as 

 package
 {
     public class Person
     {
         public var name:String;
         public var age:int;
         public function Person()
         {
         }
     }
 }

Client.as 

 package {
     import com.adobe.serialization.json.JSON;

     import flash.display.Sprite;
     import flash.events.*;
     import flash.net.Socket;
     import flash.text.*;

     public class Client extends Sprite
     {
         private var socket:Socket;
         private var myField:TextField;
         private var send_data:Person;
         public function Client()
         {
             socket = new Socket();
             myField = new TextField();
             send_data = new Person();
             send_data.name = "Hideto";
             send_data.age = 23;
             socket.addEventListener(ProgressEvent.SOCKET_DATA, onSocketData);
             socket.connect("localhost", 8888);
             socket.writeUTFBytes(JSON.encode(send_data));
             socket.flush();
             myField.x = 20;
             myField.y = 30;
             myField.text = "test";
             myField.autoSize = TextFieldAutoSize.LEFT;
             addChild(myField);
         }
         private function onSocketData(event:ProgressEvent):void {
             while(socket.bytesAvailable) {
                 var recv_data:* = JSON.decode(socket.readUTFBytes(socket.bytesAvailable));
                 myField.text = "Name: " + recv_data.name + ", age: " + recv_data.age.toString();
             }
         }
     }
 }

运行Erlang服务器端： 

 Eshell> c(server).
 Eshell> server:start().
 "{\"name\":\"Hideto\",\"age\":23}"
 Name: "Hideto", Age: 23

这里打印出了Erlang Socket Server接收到的AS3 Client发过来的JSON decode过的一个person对象 

运行AS3客户端： 
client.html上首先显示“test”，然后异步处理完Socket消息发送和接受后，decode Erlang Server端发过来的person对象，将页面上的TextField替换为“Name: Hideto2, age: 24”