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websocket,使用tomcat7转发

websocket 
阅读更多
前篇：
http://haoningabc.iteye.com/blog/2011985
代码的git地址
https://github.com/killinux/mysocket/tree/master/websocket/project/tomcat7servlet


如果是使用tomcat7的模式
1.html是客户端
2.tomcat7的servlet对websocket协议进行了封装，里面转发给普通的socket服务端
3.普通的socket 作为服务端


html ----->tomcat7,servlet----->socket server



这里纯js的客户端： 
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">  
<html>  
<head>  
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">  
<title>Insert title here</title>  
</head>  
<script type="text/javascript">  
    var ws = null;  
    function startServer() {  
        var url = "ws://192.168.0.102:5000";  
        if ('WebSocket' in window) {  
            ws = new WebSocket(url);  
        } else if ('MozWebSocket' in window) {  
            ws = new MozWebSocket(url);  
        } else {  
            alert('浏览器不支持');  
            return;
        }  
        ws.onopen = function() {  
            alert('Opened!');  
        };  
        // 收到服务器发送的文本消息, event.data表示文本内容  
        ws.onmessage = function(event) {  
            alert('Receive message: ' + event.data);  
        };  
        ws.onclose = function() {  
          alert('Closed!');  
        }  
}  
    //发送信息  
    function sendMessage(){  
        var textMessage=document.getElementById("textMessage").value;  
          
        if(ws!=null&&textMessage!=""){  
            ws.send(textMessage);  
              
        }  
    }  
</script>  
<body onload="startServer()">  
        <input type="text" id="textMessage" size="20" />  
        <input type="button" onclick="sendMessage()" value="Send">  
    </body>  
</html>


如果是用java-websocket，

git为 https://github.com/killinux/Java-WebSocket
代码如下：
socket server端： 
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.net.ServerSocket;
import java.net.Socket;
public class Server {
	public static final int PORT = 5000;
	public static void main(String[] args) {
		System.out.println("服务器...\n");
		Server ser = new Server();
		ser.sock();
	}
	public void sock() {
		try {
			ServerSocket server = new ServerSocket(PORT);
			while (true) {
				// 一旦有堵塞, 则表示服务器与客户端获得了连接
				Socket client = server.accept();
				// 处理这次连接
				new PServer(client);
			}
		} catch (Exception e) {
			System.out.println("服务器异常: " + e.getMessage());
		}
	}

	private class PServer implements Runnable {
		private Socket socket;
		public PServer(Socket sock) {
			socket = sock;
			new Thread(this).start();
		}
		public void run() {
			System.out.println("一个客户端连接ip:" + socket.getInetAddress());
			try {
				// 读取客户端数据
				DataInputStream input = new DataInputStream(
						socket.getInputStream());
				// 向客户端发送数据
				DataOutputStream out = new DataOutputStream(
						socket.getOutputStream());
				// 读取客户端数据
				//System.out.println("客户端发过来的内容: " + input.readUTF());
				byte[] bt = new byte[1024];
				int leng = input.read(bt);
				System.out.println(new String(bt, 0, leng));
				// 发送键盘输入的一行
				// String s = new BufferedReader(new
				// InputStreamReader(System.in)).readLine();
				String s = "server d shu ru";
				out.write(s.getBytes());
				out.flush();
				input.close();
				out.close();
				socket.close();
			} catch (Exception e) {
				System.out.println("服务器 run 异常: " + e.getMessage());
			}
		}

	}

}

----------------------------------------------------------------------
----------------------------------------------------------------------
如果server是用tomcat转发
参考
http://blog.csdn.net/a79412906/article/details/9393515
servlet: 
package com.hao;

import java.io.DataInputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;

import javax.servlet.http.HttpServletRequest;

import org.apache.catalina.websocket.MessageInbound;
import org.apache.catalina.websocket.StreamInbound;
import org.apache.catalina.websocket.WebSocketServlet;

public class HelloWorldWebSocketServlet extends WebSocketServlet {

	protected StreamInbound createWebSocketInbound(String subProtocol,HttpServletRequest arg1) {

		return new MessageInbound() {

			@Override
			protected void onBinaryMessage(ByteBuffer arg0) throws IOException {
				// TODO Auto-generated method stub

			}

			@Override
			protected void onTextMessage(CharBuffer message) throws IOException {
				// TODO Auto-generated method stub
				System.out.println("onText--->" + message.toString());
				Socket socket;
				String msg = "";
				try {
					// 向服务器利用Socket发送信息
					socket = new Socket("192.168.1.102", 5000);
					//socket = new Socket("127.0.0.1",5000);
					PrintWriter output = new PrintWriter(
							socket.getOutputStream());

					output.write(message.toString());
					output.flush();

					// 这里是接收到Server的信息
					DataInputStream input = new DataInputStream(
							socket.getInputStream());
					byte[] b = new byte[1024];
					input.read(b);
					// Server返回的信息
					msg = new String(b).trim();

					output.close();
					input.close();
					socket.close();
				} catch (UnknownHostException e) {
					e.printStackTrace();
				} catch (IOException e) {
					e.printStackTrace();
				}
				// 往浏览器发送信息
				CharBuffer cb = CharBuffer.wrap(new StringBuilder(msg));
				getWsOutbound().writeTextMessage(cb);
			}
		};
	}

	public static void main(String[] args) {
		Socket socket;
		String message ="haoning";
		String msg = "";
		try {
			// 向服务器利用Socket发送信息
			socket = new Socket("192.168.0.102", 5000);
			// socket = new Socket("127.0.0.1",5000);
			PrintWriter output = new PrintWriter(
					socket.getOutputStream());

			output.write(message.toString());
			output.flush();

			// 这里是接收到Server的信息
			DataInputStream input = new DataInputStream(
					socket.getInputStream());
			byte[] b = new byte[1024];
			input.read(b);
			// Server返回的信息
			msg = new String(b).trim();

			output.close();
			input.close();
			socket.close();
		} catch (UnknownHostException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

web.xml配置： 
<servlet>
      <servlet-name>wsSnake</servlet-name>
      <servlet-class>com.hao.HelloWorldWebSocketServlet</servlet-class>
    </servlet>
    <servlet-mapping>
      <servlet-name>wsSnake</servlet-name>
      <url-pattern>/websocket/test</url-pattern>
    </servlet-mapping>

tomcat7的
配置 
<?xml version='1.0' encoding='utf-8'?>
<Context crossContext="true" docBase="D:/workspace/work1/Test/webapp" path="/webs" reloadable="true">
</Context>

中心server代码： 
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.net.ServerSocket;
import java.net.Socket;
public class Server {
	public static final int PORT = 5000;
	public static void main(String[] args) {
		System.out.println("服务器...\n");
		Server ser = new Server();
		ser.sock();
	}
	public void sock() {
		try {
			ServerSocket server = new ServerSocket(PORT);
			while (true) {
				// 一旦有堵塞, 则表示服务器与客户端获得了连接
				Socket client = server.accept();
				System.out.println("server accept");
				// 处理这次连接
				new PServer(client);
			}
		} catch (Exception e) {
			System.out.println("服务器异常: " + e.getMessage());
		}
	}

	private class PServer implements Runnable {
		private Socket socket;
		public PServer(Socket sock) {
			socket = sock;
			new Thread(this).start();
		}
		public void run() {
			System.out.println("一个客户端连接ip:" + socket.getInetAddress());
			try {
				// 读取客户端数据
				DataInputStream input = new DataInputStream(
						socket.getInputStream());
				// 向客户端发送数据
				DataOutputStream out = new DataOutputStream(
						socket.getOutputStream());
				// 读取客户端数据
				//System.out.println("客户端发过来的内容: " + input.readUTF());
				byte[] bt = new byte[1024];
				int leng = input.read(bt);
				System.out.println(new String(bt, 0, leng));
				// 发送键盘输入的一行
				// String s = new BufferedReader(new
				// InputStreamReader(System.in)).readLine();
				String s = "server d shu ru";
				out.write(s.getBytes());
				out.flush();
				input.close();
				out.close();
				socket.close();
			} catch (Exception e) {
				System.out.println("服务器 run 异常: " + e.getMessage());
			}
		}

	}

}


客户端改进如下： 
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">  
<html>  
<head>  
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">  
<title>Insert title here</title>  
</head>  
<script type="text/javascript">  
    var ws = null;
    function log(text) {
       document.getElementById("log").innerHTML = (new Date).getTime() + ": " + text +"<br>"+  document.getElementById("log").innerHTML;
    }  
    function startServer() {  
        var url = document.getElementById("serverip").value;// "ws://192.168.0.102:8887";  
        if ('WebSocket' in window) {  
            ws = new WebSocket(url);  
        } else if ('MozWebSocket' in window) {  
            ws = new MozWebSocket(url);  
        } else {  
            alert('浏览器不支持');  
            return;
        }  
        ws.onopen = function() {  
            alert('Opened!');  
        };  
        // 收到服务器发送的文本消息, event.data表示文本内容  
        ws.onmessage = function(event) {  
            //alert('Receive message: ' + event.data); 
            log('Receive message: ' + event.data); 
        };  
        ws.onclose = function() {  
          alert('Closed!');  
        }  
        document.getElementById("conbtn").disabled="true";
        document.getElementById("stopbtn").removeAttribute('disabled');
	}  
    //发送信息  
    function sendMessage(){  
        var textMessage=document.getElementById("textMessage").value;  
          
        if(ws!=null&&textMessage!=""){  
            ws.send(textMessage);  
              
        }  
    }  
    function stopconn(){
		ws.close();
    	document.getElementById("conbtn").removeAttribute('disabled');
    	document.getElementById("stopbtn").disabled="true";
    }
</script>  
<body onload="">  
		<input id="serverip" type="text"  size="20" value="ws://192.168.0.102:8887"/> 
		<input id="conbtn" type="button" onclick="startServer()" value="open" />
		<input id="stopbtn" type="button" onclick="stopconn()" value="stop" disabled="disabled"/>
		</br>
        <input id="textMessage" type="text"  size="20" />  
        <input type="button" onclick="sendMessage()" value="Send">  
        <div id="log"></div>
    </body>  
</html>



servlet中发现，不能广播，只能单纯的返回，如果想每个浏览器都受到消息，则修改如下 
package com.hao;

import java.io.DataInputStream;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.util.ArrayList;

import javax.servlet.http.HttpServletRequest;

import org.apache.catalina.websocket.MessageInbound;
import org.apache.catalina.websocket.StreamInbound;
import org.apache.catalina.websocket.WebSocketServlet;
import org.apache.catalina.websocket.WsOutbound;

public class HelloWorldWebSocketServlet extends WebSocketServlet {
	private static ArrayList mmiList  = new ArrayList();

	protected StreamInbound createWebSocketInbound(String subProtocol,
			HttpServletRequest arg1) {
		return new MyMessageInbound();
	}

	private class MyMessageInbound extends MessageInbound {
		WsOutbound myoutbound;

		@Override
		public void onOpen(WsOutbound outbound) {
			try {
				System.out.println("Open Client.");
				this.myoutbound = outbound;
				mmiList .add(this);
				outbound.writeTextMessage(CharBuffer.wrap("Hello!"));
			} catch (IOException e) {
				e.printStackTrace();
			}
		}

		@Override
		public void onClose(int status) {
			System.out.println("Close Client.");
			mmiList .remove(this);
		}

		@Override
		protected void onBinaryMessage(ByteBuffer arg0) throws IOException {
			// TODO Auto-generated method stub

		}

		@Override
		protected void onTextMessage(CharBuffer message) throws IOException {
			// TODO Auto-generated method stub
			System.out.println("onText--->" + message.toString());
			for (int i=0;i< mmiList.size();i++ ) {
				MyMessageInbound mmib = (MyMessageInbound) mmiList.get(i);
                CharBuffer buffer = CharBuffer.wrap(message);
                mmib.myoutbound.writeTextMessage(buffer);
                mmib.myoutbound.flush();
            }
			
			/*Socket socket;
			String msg = "";
			try {
				// 向服务器利用Socket发送信息
				socket = new Socket("192.168.0.102", 5000);
				// socket = new Socket("127.0.0.1",5000);
				PrintWriter output = new PrintWriter(socket.getOutputStream());

				output.write(message.toString());
				output.flush();

				// 这里是接收到Server的信息
				DataInputStream input = new DataInputStream(
						socket.getInputStream());
				byte[] b = new byte[1024];
				input.read(b);
				// Server返回的信息
				msg = new String(b).trim();

				output.close();
				input.close();
				socket.close();
			} catch (UnknownHostException e) {
				e.printStackTrace();
			} catch (IOException e) {
				e.printStackTrace();
			}
			// 往浏览器发送信息
			CharBuffer cb = CharBuffer.wrap(new StringBuilder(msg));
			getWsOutbound().writeTextMessage(cb);*/
		}
	}

	public static void main(String[] args) {
		Socket socket;
		String message = "haoning";
		String msg = "";
		try {
			// 向服务器利用Socket发送信息
			socket = new Socket("192.168.0.102", 5000);
			// socket = new Socket("127.0.0.1",5000);
			PrintWriter output = new PrintWriter(socket.getOutputStream());

			output.write(message.toString());
			output.flush();

			// 这里是接收到Server的信息
			DataInputStream input = new DataInputStream(socket.getInputStream());
			byte[] b = new byte[1024];
			input.read(b);
			// Server返回的信息
			msg = new String(b).trim();

			output.close();
			input.close();
			socket.close();
		} catch (UnknownHostException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
}

这段参考
http://blog.fens.me/java-websocket-intro/
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