socket-udp-java-client

this repository is communication using protocol udp with the server using nodejs and the client using java, before you use this repository i'm reommended to read this article UDP introduction, because any some different in TCP and UDP.

requiretment

1) node.js
2) java socket UDP using DatagramPacket and DatagramSocket
3) json

Running The Application

install nodejs
install java SDK,JRE or
install IDE(recomended Netbeans because the repository using netbeans)
run the server that been use nodejs
for the server code

    var dgram = require("dgram");
    var server = dgram.createSocket("udp4");
    server.on("message", function (msg, rinfo) {
    var data = JSON.parse(msg);
    console.log("server got: " + data.balance + " from " + rinfo.address + ":" + rinfo.port);
    
    var data = {
        "name" : "test",
        "args" : {
            "data":[{
                "a":1
            }]
            }
        };
    //send data to client
    var message = new Buffer(JSON.stringify(data));//JSON.stringify(data)
    server.send(message, 0, message.length, rinfo.port, rinfo.address, function(err, bytes) {
        console.log("error mamen = " + err );
        console.log("data bytes = " + bytes);
    //server.close();
    });
    });

    server.on("listening", function () {
        var address = server.address();
        console.log("server listening " +
        address.address + ":" + address.port);
    });

    server.bind(41234);

save to app.js run with sudo node app.js

run the UDPImplementation.java to test application

        public static void main(String[] args) throws UnknownHostException, SocketException, IOException {
        InetAddress IPAddress =  InetAddress.getByName("localhost");
        byte[] sendData = new byte[1024];

        JSONObject obj = new JSONObject();
        obj.put("name", "viyancs");
        obj.put("num", new Integer(100));
        obj.put("balance", new Double(1000.21));
        obj.put("is_vip", new Boolean(true));
        obj.put("nickname",null);

        sendData = obj.toJSONString().getBytes();
        SocketUDP client = new SocketUDP(IPAddress,41234,callback);
        client.connect();
        client.send(sendData);
        client.initReceive();
        client.close();
        client.disconnect();
    }
    
    final static public UDPCallback callback = new UDPCallback() {

        @Override
        public void onConnect() {
            System.out.println("server is connected");
        }
        
        @Override
        public void onMessage(String event, JSONArray json) {
            System.out.println("the event is " + event + "\n");
            System.out.println("the data is " + json.toJSONString() + "\n");
        }

        @Override
        public void onMessage(String data) {
            System.out.println("data from server : " + data);
        }
        
        @Override
        public void onMessage(JSONObject msg) {
            System.out.println("data from server = " + msg.toJSONString());           
        }
        @Override
        public void onMessage(String event, JSONObject json) {
            System.out.println("data from server = " + json.toJSONString());  
        }
    

        @Override
        public void onClose() {
            System.out.println("client is close the request");
        }

        @Override
        public void onError(ParseException ex) {
            System.out.println("something wrong : " + ex.getMessage());
        }

        @Override
        public void onDisconnect() {
            System.out.println("client is disconnect");
        }
    };

Features

send data using string format
send data using JSONFormat (JSONObject,JSONArray) and dynamical JSON.
receive data using string format
receive data using json format

Bugging

missing detected server is active or not

Licence