- js和python是两种语言,js处理网页数据,python可作为服务端开发,两者通过
websocket进行通信。 websocket是socket的封装,省去了通信上的HTTP协议转换上的麻烦.- 大中型项目推荐使用torando/Djiango平台,两个平台集成度较高,方便开发使用.
实验以发送html页面上的图片到服务器后端为例子.
服务端接收图片后,开启本地端口为10086的服务,等待前端的连接.服务把前端发的图像url存在本地文件car.bmp.
import asyncio
import websockets
import urllib.request
async def recv_user_msg(websocket):
while True:
url = await websocket.recv()
urllib.request.urlretrieve(url,'car.bmp')
await websocket.send('ok')
async def run(websocket, path):
while True:
try:
await recv_user_msg(websocket)
except websockets.ConnectionClosed:
print("ConnectionClosed...", path)
break
if __name__ == '__main__':
print("127.0.0.1:10086 websocket...")
asyncio.get_event_loop().run_until_complete(websockets.serve(run, "127.0.0.1", 10086))
asyncio.get_event_loop().run_forever()
缺少module直接pip install安装解决.
pip install websockets pip install urllib
在页面上嵌入img标签,连接服务端,点击发送图片,图片发送至服务端,并且显示返回结果.
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>测试Socket——ws://127.0.0.1:10086</title>
</head>
<body>
<img id = 'img' src="https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1598273151875&di=2823d5f7c3aa5e075bd785572e3e1561&imgtype=0&src=http%3A%2F%2Fimage.9game.cn%2F2019%2F8%2F8%2F90082743.jpg"/>
<button onclick = "send_img()">发送图片</>
<script type="text/javascript">
var socket;
var ws = new WebSocket("ws://127.0.0.1:10086/test");
socket = ws;
ws.onopen = function() {
console.log('连接成功');
};
ws.onmessage = function(evt) {
var received_msg = evt.data;
alert('recv:' + received_msg + ' 发送完成');
};
ws.onclose = function() {
s = '断开了连接'
alert(s);
};
function send_img() {
image = document.getElementById('img');
socket.send(image.src);
}
</script>
</body>
</html>
