itcp wed components 是什么软件

Question

如题所述

Answer 1

netty v3.9.4
websocket连接建立前，客户端需要与服务器进行握手（http协议） 确认websocket连接，也就是说在处理websocket请求前，必需要处理一些http请求。
websocket到现在为止，已经有多个版本，netty有相应的对应类，这部分处理一般不需要人工干预。

如果运行正常的话，会在页面的文本框中显示1-20记数。
可以通过firefox或chrome的开发人员工具，显看浏览器与服务器的交互。

主要是HttpServerChannelHandler2，加了些注释和少量debug代码。
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package org.sl.demo.httpserver1;

import java.util.List;
import java.util.Map;

import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelHandlerContext;
import org.jboss.netty.channel.MessageEvent;
import org.jboss.netty.channel.SimpleChannelHandler;
import org.jboss.netty.handler.codec.http.DefaultHttpResponse;
import org.jboss.netty.handler.codec.http.HttpHeaders;
import org.jboss.netty.handler.codec.http.HttpMethod;
import org.jboss.netty.handler.codec.http.HttpRequest;
import org.jboss.netty.handler.codec.http.HttpResponseStatus;
import org.jboss.netty.handler.codec.http.HttpVersion;
import org.jboss.netty.handler.codec.http.websocketx.CloseWebSocketFrame;
import org.jboss.netty.handler.codec.http.websocketx.PingWebSocketFrame;
import org.jboss.netty.handler.codec.http.websocketx.PongWebSocketFrame;
import org.jboss.netty.handler.codec.http.websocketx.TextWebSocketFrame;
import org.jboss.netty.handler.codec.http.websocketx.WebSocketFrame;
import org.jboss.netty.handler.codec.http.websocketx.WebSocketServerHandshaker;
import org.jboss.netty.handler.codec.http.websocketx.WebSocketServerHandshakerFactory;

public class HttpServerChannelHandler2 extends SimpleChannelHandler{
public static boolean debug = true;

@Override
public void messageReceived(ChannelHandlerContext ctx, MessageEvent e) {
Channel ch = e.getChannel();
Object msg = e.getMessage();

if(debug){
System.out.println("---------------");
System.out.println("message: "+msg.getClass());
}
//虽然是websocket，但在建立websocket连接前，先进行http握手,所以，这时也要处理http请求
//在http握手完成后，才是websocket下的通信
if(msg instanceof HttpRequest){
processHttpRequest(ch, (HttpRequest)msg);
}else if(msg instanceof WebSocketFrame){
processWebsocketRequest(ch,(WebSocketFrame)msg);
}else{
//未处理的请求类型
}
}

//这个方法：
//1.完成websocket前的http握手
//2.屏蔽掉非websocket握手请求
void processHttpRequest(Channel channel,HttpRequest request){
HttpHeaders headers = request.headers();
if(debug){
List<Map.Entry<String,String>> ls = headers.entries();
for(Map.Entry<String,String> i: ls){
System.out.println("header "+i.getKey()+":"+i.getValue());
}
}

//屏蔽掉非websocket握手请求
//只接受http GET和headers['Upgrade']为'websocket'的http请求
if(!HttpMethod.GET.equals(request.getMethod())
|| !"websocket".equalsIgnoreCase(headers.get("Upgrade"))){
DefaultHttpResponse resp = new DefaultHttpResponse(
HttpVersion.HTTP_1_1,
HttpResponseStatus.BAD_REQUEST);
channel.write(resp);
channel.close();
return;
}

WebSocketServerHandshakerFactory wsShakerFactory = new WebSocketServerHandshakerFactory(
"ws://"+request.headers().get(HttpHeaders.Names.HOST),
null,false );
WebSocketServerHandshaker wsShakerHandler = wsShakerFactory.newHandshaker(request);
if(null==wsShakerHandler){
//无法处理的websocket版本
wsShakerFactory.sendUnsupportedWebSocketVersionResponse(channel);
}else{
//向客户端发送websocket握手,完成握手
//客户端收到的状态是101 sitching protocol
wsShakerHandler.handshake(channel, request);
}
}

//websocket通信
void processWebsocketRequest(Channel channel, WebSocketFrame request){
if(request instanceof CloseWebSocketFrame){
channel.close();
}else if(request instanceof PingWebSocketFrame){
channel.write(new PongWebSocketFrame(request.getBinaryData()));
}else if(request instanceof TextWebSocketFrame){
//这个地方 可以根据需求，加上一些业务逻辑
TextWebSocketFrame txtReq = (TextWebSocketFrame) request;
if(debug){ System.out.println("txtReq:"+txtReq.getText());}

//向ws客户端发送多个响应
for(int i=1; i<=20; i++){
channel.write(new TextWebSocketFrame(""+i));
try{Thread.sleep(300);}catch(Exception ex){}
}
}else{
//WebSocketFrame还有一些
}
}
}

其他类跟网上的差不多：
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package org.sl.demo.httpserver1;

import java.net.InetSocketAddress;
import java.util.concurrent.Executors;

import org.jboss.netty.bootstrap.ServerBootstrap;
import org.jboss.netty.channel.socket.nio.NioServerSocketChannelFactory;

public class HttpServer implements Runnable{
int port = 80;

public HttpServer(int port){
this.port = port;
}

@Override
public void run() {
ServerBootstrap b = new ServerBootstrap(
new NioServerSocketChannelFactory(
Executors.newCachedThreadPool(),
Executors.newCachedThreadPool()));
b.setPipelineFactory(new HttpServerChannelPipelineFactory());
b.setOption("child.tcpNoDelay", true);
b.setOption("child.keepAlive", true);
b.bind(new InetSocketAddress(port));
}

public static void main(String[] args){
new HttpServer(80).run();
}
}

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package org.sl.demo.httpserver1;

import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.ChannelPipelineFactory;
import org.jboss.netty.channel.Channels;
import org.jboss.netty.handler.codec.http.HttpRequestDecoder;
import org.jboss.netty.handler.codec.http.HttpResponseEncoder;
import org.jboss.netty.handler.codec.http.websocketx.WebSocket00FrameDecoder;
import org.jboss.netty.handler.codec.http.websocketx.WebSocket08FrameDecoder;

public class HttpServerChannelPipelineFactory implements ChannelPipelineFactory {

@Override
public ChannelPipeline getPipeline() throws Exception {
ChannelPipeline cp = Channels.pipeline();

cp.addLast("decoder", new HttpRequestDecoder());
// cp.addLast("decoder", new WebSocket00FrameDecoder());
cp.addLast("encoder", new HttpResponseEncoder());
// cp.addLast("downhandler", new HttpServerDownstreamHandler());
// cp.addLast("uphandler", new HttpServerUpstreamHandler());
cp.addLast("handler", new HttpServerChannelHandler2());

return cp;
}

}

测试页面：
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<html>
<head>
<script >
function connect1(){
alert('connect1');

var ta = document.getElementById('responseText');
var socket = new WebSocket('ws://127.0.0.1/websocket');
if (window.WebSocket) {

}else{
alert('Your browser does not support Web Socket.');
return;
}
socket.onopen = function(event) {
ta.value = "Web Socket opened!";
}

socket.onmessage = function(event) {
ta.value = event.data;
};

socket.onclose = function(event) {
ta.value = "Web Socket closed";
};
}

function connect() {
alert('connect');
var socket;
if (!window.WebSocket) {
window.WebSocket = window.MozWebSocket;
}

if (window.WebSocket) {
socket = new WebSocket("ws://127.0.0.1/websocket");
socket.onmessage = function(event) {
var ta = document.getElementById('responseText');
ta.value = event.data;
};

socket.onopen = function(event) {
var ta = document.getElementById('responseText');
ta.value = "Web Socket opened!";
socket.send('hello');
};

socket.onclose = function(event) {
var ta = document.getElementById('responseText');
ta.value = "Web Socket closed";
};

socket.onerror = function(event){
};
} else {
alert("Your browser does not support Web Socket.");
}
}
</script>
</head>

<body>
<input type="button" onclick="connect1()" value="ws connect1"/> <br/><br/>
<input type="button" onclick="connect()" value="ws connect"/> <br/><br/>
<input id="responseText" type="text" value="123456"/>
</body>
</html>

Answer 2

海康威视的视频监控插件