html5支持udp协议吗,HTML5的TCP和UDP Web Socket API草案定稿
一個(gè)UDP的例子：
//
// This example shows a simple implementation of UPnP-SSDP M-SEARCH
// discovery using a multicast UDPSocket
//
var address = '239.255.255.250',
port = '1900',
serviceType = 'upnp:rootdevice',
rn = '\r\n',
search = '';
// Create a new UDP client socket
var mySocket = new UDPSocket();
// Build an SSDP M-SEARCH multicast message
search += 'M-SEARCH * HTTP/1.1' + rn;
search += 'ST: ' + serviceType + rn;
search += 'MAN: "ssdp:discover"' + rn;
search += 'HOST: ' + address + ':' + port + rn;
search += 'MX: 10';
// Receive and log SSDP M-SEARCH response messages
function receiveMSearchResponses() {
// While data in buffer, read and log UDP message
while (mySocket.readable.state === "readable") {
var msg = mySocket.readable.read();
console.log ('Remote address: ' + msg.remoteAddress +
' Remote port: ' + msg.remotePort +
'Message: ' + ab2str(msg.data));
// ArrayBuffer to string conversion could also be done by piping
// through a transform stream. To be updated when the Streams API
// specification has been stabilized on this point.
}
// Wait for SSDP M-SEARCH responses to arrive
mySocket.readable.wait().then(
receiveMSearchResponses,
e => console.error("Receiving error: ", e);
);
}
// Join SSDP multicast group
mySocket.joinMulticast(address);
// Send SSDP M-SEARCH multicast message
mySocket.writeable.write(
{data : str2ab(search),
remoteAddress : address,
remotePort : port
}).then(
() => {
// Data sent sucessfully, wait for response
console.log('M-SEARCH Sent');
receiveMSearchResponses();
},
e => console.error("Sending error: ", e);
);
// Log result of UDP socket setup.
mySocket.opened.then(
() => {
console.log("UDP socket created sucessfully");
},
e =>console.error("UDP socket setup failed due to error: ", e);
);
// Handle UDP socket closed, either as a result of the application
// calling mySocket.close() or an error causing the socket to be
closed.
mySocket.closed.then(
() => {
console.log("Socket has been cleanly closed");
},
e => console.error("Socket closed due to error: ", e);
);
相比UDP，TCP的示例代碼顯得簡(jiǎn)單一些
//
// This example shows a simple TCP echo client.
// The client will send "Hello World" to the server on port 6789 and log
// what has been received from the server.
//
// Create a new TCP client socket and connect to remote host
var mySocket = new TCPSocket("127.0.0.1", 6789);
// Send data to server
mySocket.writeable.write("Hello World").then(
() => {
// Data sent sucessfully, wait for response
console.log("Data has been sent to server");
mySocket.readable.wait().then(
() => {
// Data in buffer, read it
console.log("Data received from server:" + mySocket.readable.read());
// Close the TCP connection
mySocket.close();
},
e => console.error("Receiving error: ", e);
);
},
e => console.error("Sending error: ", e);
);
// Signal that we won't be writing any more and can close the write half of the connection.
mySocket.halfClose();
// Log result of TCP connection attempt.
mySocket.opened.then(
() => {
console.log("TCP connection established sucessfully");
},
e =>console.error("TCP connection setup failed due to error: ", e);
);
// Handle TCP connection closed, either as a result of the application
// calling mySocket.close() or the other side closed the TCP
// connection or an error causing the TCP connection to be closed.
mySocket.closed.then(
() => {
console.log("TCP socket has been cleanly closed");
},
e => console.error("TCP socket closed due to error: ", e);
);
總結(jié)
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