erlang和java的socket通讯----最简单，初次实现。

直接上源码，留做纪念。

有点简单，大家不要笑，初次实现。

功能描述:java发送数据给erlang，erlang将收到的数据重复两次再发送给java。

erlang源码：模块tcp_listen

-module(tcp_listen).

-export([start/0,close/1]).
-define(PORT,5002).

 start() ->
 	AA= << "我是汉字">>,
	io:format("hello erlang ~w~n",[[AA,byte_size(AA)]]),
	case	gen_tcp:listen( ?PORT,[binary,{active,true},{packet,0}])
	of

		{ok,LSocket}->
					io:format("listen port success ~w~n",[LSocket]),

					spawn(fun() -> loop(LSocket) end)	,
					{ok,LSocket}
					;
		{error,Reason}->
					io:format("listen port error Reason: ~w~n",[Reason]),
					{error,{cannot_listen,Reason}}
	end	.

%%  server socket begin listen
loop(LSocket)->
		io:format("begin listen lsocket: ~n",[]),
	case gen_tcp:accept(LSocket)
	of
		{ok,Socket}->
				io:format("receive client connect: ~w~n",[Socket]),
					begin_receive(Socket),
					spawn(fun()-> loop(LSocket) end)
		;
		{error,Reason}->
				io:format("accept client  error: ~w~n",[Reason])
end.

begin_receive(Socket)->
			io:format("begin listen socket client data: ~n",[]),
			receive
				{tcp,Socket,Data}->
						NewData= <<Data/binary,Data/binary>>,
					io:format("receive client data1: ~w~n",[NewData]),

					gen_tcp:send(Socket,NewData)	,
					begin_receive(Socket);

				Data_2->
				io:format("receive client data2: ~w~n",[Data_2])
				end.

close(LSocket)->
gen_tcp:close(LSocket).

java源码：类Test

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.UnsupportedEncodingException;
import java.net.Socket;
import java.net.SocketAddress;
import java.net.UnknownHostException;

public class Test {

public static void main(String[] args)
    {
        // TODO Auto-generated method stub
        System.out.println("ni hao");
        String AA="我是汉字";
        
        byte[] byte_write=null;
        try
        {
            byte_write=AA.getBytes("UTF8");
        }
        catch (UnsupportedEncodingException e)
        {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        System.out.println(byte_write.length);
        
        int port=5002;
        String ip="localhost";
        Socket socket=null;
        try
        {
             socket=new Socket(ip,port);
             System.out.println("socket connect success");
        }
        catch (UnknownHostException e)
        {
            // TODO Auto-generated catch block
             System.out.println("error:"+e.getLocalizedMessage());
        }
        catch (IOException e)
        {
            // TODO Auto-generated catch block
             System.out.println("error:"+e.getLocalizedMessage());
        }
        
        OutputStream out_stream = null;
        InputStream in_stream = null;
        try {
            out_stream = socket.getOutputStream();
            in_stream = socket.getInputStream();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

byte[] byte_read=new byte[1024];
        int data_in_length=0;
        String read_in_str=null;
        try
        {
            out_stream.write(byte_write);
            System.out.println("socket write success");
            
            data_in_length=in_stream.read(byte_read);
            read_in_str=new String(byte_read,0,data_in_length, "UTF8");
            System.out.println("data_in_length:"+data_in_length+",read_in_str:"+read_in_str);
        }
        catch (IOException e)
        {
            // TODO Auto-generated catch block
             System.out.println("socket connect fail");
        }
        
        try {
            socket.close();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        
    }

}

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