看完让你彻底搞懂Websocket原理，附通过netty完成Websocket( 三 ) _Websocket

}
@Override
public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
System.out.println("ChannelId" + ctx.channel().id().asLongText());
}
@Override
public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
System.out.println("用户下线: " + ctx.channel().id().asLongText());
}
@Override
public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
ctx.channel().close();
}
}

test.html

<!DOCTYPE html><html><head> <meta charset="UTF-8"> <title>Socket</title> <script type="text/javascript"> var websocket; //如果浏览器支持WebSocket if(window.WebSocket){ websocket = new WebSocket("ws://localhost:8989/ws"); //获得WebSocket对象 //当有消息过来的时候触发 websocket.onmessage = function(event){ var respMessage = document.getElementById("respMessage"); respMessage.value = respMessage.value + "n" + event.data; } //连接关闭的时候触发 websocket.onclose = function(event){ var respMessage = document.getElementById("respMessage"); respMessage.value = respMessage.value + "n断开连接"; } //连接打开的时候触发 websocket.onopen = function(event){ var respMessage = document.getElementById("respMessage"); respMessage.value = "建立连接"; } }else{ alert("浏览器不支持WebSocket"); } function sendMsg(msg) { //发送消息 if(window.WebSocket){ if(websocket.readyState == WebSocket.OPEN) { //如果WebSocket是打开状态 websocket.send(msg); //send()发送消息 } }else{ return; } } </script></head><body><form onsubmit="return false"> <textarea style="width: 300px; height: 200px;" name="message"></textarea> <input type="button" onclick="sendMsg(this.form.message.value)" value="发送"><br> <h3>信息</h3> <textarea style="width: 300px; height: 200px;" id="respMessage"></textarea> <input type="button" value="清空" onclick="javascript:document.getElementById('respMessage').value = ''"></form></body></html>