Ben*_*Ben 1 javascript java html5 utf-8 websocket
我似乎无法在Java服务器和JavaScript客户端之间建立"正确"连接.它似乎连接好了,客户端发送它的标题好吧,但这是它得到的.onopen或者onmessage根本不会触发这些功能.
这是Java服务器的代码:
import java.net.*;
import java.io.*;
public class Server {
static DataOutputStream out;
public static void main(String[] args) {
try {
ServerSocket serverSocket = new ServerSocket(8112);
System.out.println("Server Started");
while(true) {
Socket socket = serverSocket.accept();
System.out.println("A client connected");
out = new DataOutputStream(socket.getOutputStream());
//Send a simple-as-can-be handshake encoded with UTF-8
String handshake = "HTTP/1.1 101 Web Socket Protocol Handshake\r" +
"Upgrade: WebSocket\r" +
"Connection: Upgrade\r" +
"WebSocket-Origin: http://localhost\r" +
"WebSocket-Location: ws://localhost:8112/\r" +
"WebSocket-Protocol: sample\r\n\r\n";
out.write(handshake.getBytes("UTF8"));
System.out.println("Handshake sent.");
//Send message 'HI!' encoded with UTF-8
String message = "HI!";
out.write(0x00);
out.write(message.getBytes("UTF8"));
out.write(0xff);
System.out.println("Message sent!");
//Cleanup
socket.close();
out.close();
System.out.println("Everything closed!");
}
} catch(Exception e) {
System.out.println(e.getMessage());
}
}
这是客户端的代码:
<html>
<head>
<meta charset="UTF-8">
<script>
function load() {
var ssocket = new WebSocket("ws://localhost:8112/");
socket.onopen = function(e) { alert("opened"); }
socket.onclose = function(e) { alert("closed"); }
socket.onmessage = function(e) { alert(e.data); }
}
</script>
</head>
<body onload="load();">
</body>
</html>
为什么不会onopen或onmessage触发？我尝试过很多不同的东西,我似乎无法做到.
我究竟做错了什么？
您似乎缺少协议的挑战 - 响应方面 - 客户端发送两个额外的标头和一些随机数据:
GET /demo HTTP/1.1 Host: example.com Connection: Upgrade Sec-WebSocket-Key2: 12998 5 Y3 1 .P00 Sec-WebSocket-Protocol: sample Upgrade: WebSocket Sec-WebSocket-Key1: 4 @1 46546xW%0l 1 5 Origin: http://example.com ^n:ds[4U
并且服务器应该通过以下方式获得MD5响应:
产生如下响应:
HTTP/1.1 101 WebSocket Protocol Handshake Upgrade: WebSocket Connection: Upgrade Sec-WebSocket-Origin: http://example.com Sec-WebSocket-Location: ws://example.com/demo Sec-WebSocket-Protocol: sample 8jKS'y:G*Co,Wxa-
此过程旨在防止WebSocket服务器处理非WebSocket请求 - 有关详细信息,请参阅WebSocket协议的第1.3节.
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