编辑: 我想通过Web Interface在Android和Browser上实现一个测验应用程序。 我正在寻找一种在服务器和客户端之间进行通信的方法。我试过socket.io但是无法使用android。
我正在使用在nodester(nodester.com)上托管的node.js服务器。 我尝试了一些库,但无法使其正常工作。
我现在正在与https://github.com/einaros/ws
的einaros / ws合作服务器代码是:
var clients = [],
numClients = 0;
var WebSocketServer = require('ws').Server,
wss = new WebSocketServer({port: 20083});
wss.on('connection', function(ws) {
ws.on('message', function(message) {
console.log(wss.clients);
console.log('received: %s', message);
incomingMessage(message, ws)
});
/*
ws.on('eigenesEvent', function(message) {
console.log('eigenes Event ausgelöst: ' + message);
});
*/
});
function incomingMessage(msg, ws) {
//console.log(wss.clients);
var obj = JSON.parse(msg);
if(obj.type == "connect") {
for(var i=0;i<clients.length;i++) {
if(clients[i] == obj.id) {
ws.send(JSON.stringify({
to: obj.id,
message: "name vergeben"
}));
return;
}
}
clients[numClients] = obj.id;
numClients++;
for(var i=0;i<clients.length;i++) {
console.log("Client" + i + ": " + clients[i]);
}
ws.send(JSON.stringify({
to: "all",
message: obj.id + " connected"
}));
}
if(obj.type == "disconnect") {
for(var i=0;i<clients.length;i++) {
if(clients[i] == obj.id) {
clients.splice(i, 1);
numClients--;
for(var i=0;i<clients.length;i++) {
console.log("Client" + i + ": " + clients[i]);
}
}
}
ws.send(JSON.stringify({
to: "all",
message: obj.id + " disconnected"
}));
return;
}
if(obj.type == "answer") {
if("id" in obj) {
if(obj.answer == "a") {
ws.send(JSON.stringify({
to: obj.id,
message: "a is correct"
}));
} else {
ws.send(JSON.stringify({
to: obj.id,
message: "answer is incorrect"
}));
}
}
}
if(obj.type == "something") {
if("id" in obj) {
ws.send(JSON.stringify({
to: obj.id,
message: "received: " + obj.message
}));
}
}
}
从HTML站点我可以通过以下方式连接到服务器:
connect = function() {
var host = "ws://einaros.nodester.com";
try{
socket = new WebSocket(host);
console.log('WebSocket - status ' + socket.readyState);
socket.onopen = function(msg) {
console.log("Welcome - status " + this.readyState);
socket.send(JSON.stringify({
id: model.getClientName(),
type: "connect"
}));
model.setConnectionStatus(true);
};
socket.onmessage = function(msg) {
console.log("onmessage - msg: " + msg.data);
checkMessage(msg.data);
};
socket.onclose = function(msg) {
console.log("Disconnected - status " + this.readyState);
model.setConnectionStatus(false);
};
}
catch(ex){
console.log(ex);
}
},
在Android-Client方面,我使用的是来自http://autobahn.ws/android的AutobahnAndroid
android的客户端代码是:
package ps.mediengestaltung;
import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import de.tavendo.autobahn.WebSocketConnection;
import de.tavendo.autobahn.WebSocketException;
import de.tavendo.autobahn.WebSocketHandler;
public class MainActivity extends Activity {
public final WebSocketConnection mConnection = new WebSocketConnection();
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final String wsuri = "ws://einaros.nodester.com";
try {
mConnection.connect(wsuri, new WebSocketHandler() {
@Override
public void onOpen() {
Log.d("TAG", "Status: Connected to " + wsuri);
mConnection.sendTextMessage("Hello Server!");
}
@Override
public void onTextMessage(String payload) {
Log.d("TAG", "Got echo: " + payload);
}
@Override
public void onClose(int code, String reason) {
Log.d("TAG", "Connection lost.");
}
});
} catch (WebSocketException e) {
Log.d("TAG", e.toString());
}
}
}
在LogCat我得到:
08-01 08:48:13.017:D / TAG(704):状态:已连接至ws://einaros.nodester.com
08-01 08:48:13.167:D / TAG(704):连接丢失。
我究竟做错了什么?任何提示?
答案 0 :(得分:2)
原因可能是:Weberknecht只实现了(过时的)Hixie-76版本的WebSocket。
您可以尝试AutobahnAndroid,它实现了WebSocket的最终RFC6455版本。
另一件事:您正在使用的WebSocket服务器不再维护(据我所知)。它也只实现了Hixie-76-- Chrome / Firefox不再支持它。
尝试以下方法之一:
免责声明:我是高速公路的作者并为Tavendo工作。
答案 1 :(得分:1)
您要求手机连接到本地主机。你没有在手机上运行节点吗? :)
URI url = new URI("ws://127.0.0.1:8080/test");
这应该指向您的nodeter地址/端口。