main.py
from typing import List
from fastapi import FastAPI, WebSocket, WebSocketDisconnect
app = FastAPI()
class ConnectionManager:
def __init__(self):
# 存放激活的ws连接对象
self.active_connections: List[WebSocket] = []
async def connect(self, ws: WebSocket):
# 等待连接
await ws.accept()
# 存储ws连接对象
self.active_connections.append(ws)
def disconnect(self, ws: WebSocket):
# 关闭时 移除ws对象
self.active_connections.remove(ws)
@staticmethod
async def send_personal_message(message: str, ws: WebSocket):
# 发送个人消息
await ws.send_text(message)
async def broadcast(self, message: str):
# 广播消息
for connection in self.active_connections:
await connection.send_text(message)
manager = ConnectionManager()
@app.websocket("/ws/{user}")
async def websocket_endpoint(websocket: WebSocket, user: str):
await manager.connect(websocket)
await manager.broadcast(f"用户{user}进入聊天室")
try:
while True:
data = await websocket.receive_text()
await manager.send_personal_message(f"你说了: {data}", websocket)
await manager.broadcast(f"用户:{user} 说: {data}")
except WebSocketDisconnect:
manager.disconnect(websocket)
await manager.broadcast(f"用户-{user}-离开")
if __name__ == "__main__":
import uvicorn
# 官方推荐是用命令后启动 uvicorn main:app --host=127.0.0.1 --port=8010 --reload
uvicorn.run(app='main:app', host="127.0.0.1", port=8010, reload=True, debug=True)chat.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>聊天1</title>
</head>
<body>
<h1>User{
{id}} Chat</h1>
<form action="" onsubmit="sendMessage(event)">
<input type="text" id="messageText" autocomplete="off"/>
<button>Send</button>
</form>
<ul id='messages'>
</ul>
<script>
var ws = new WebSocket("ws://127.0.0.1:5200/api/chat/ws/user{
{id}}");
ws.onmessage = function(event) {
var messages = document.getElementById('messages')
var message = document.createElement('li')
var content = document.createTextNode(event.data)
message.appendChild(content)
messages.appendChild(message)
};
function sendMessage(event) {
var input = document.getElementById("messageText")
ws.send(input.value)
input.value = ''
event.preventDefault()
}
</script>
</body>
</html>
The above part is a case
Here is a personal case of passing user agreement to jinjia2 template through http for html rendering
from fastapi import APIRouter,WebSocket,WebSocketDisconnect
from app1.core.websocket_config import manager
from starlette.requests import Request
from starlette.staticfiles import StaticFiles
from starlette.templating import Jinja2Templates
chat_routing=APIRouter(prefix='/chat')
@chat_routing.websocket("/ws/{user}")
async def websocket_endpoint(websocket: WebSocket, user: str):
await manager.connect(websocket)
await manager.broadcast(f"用户{user}进入聊天室")
try:
while True:
data = await websocket.receive_text()
await manager.send_personal_message(f"你说了: {data}", websocket)
await manager.broadcast(f"用户:{user} 说: {data}")
except WebSocketDisconnect:
manager.disconnect(websocket)
await manager.broadcast(f"用户-{user}-离开")
templates = Jinja2Templates(directory="templates")
@chat_routing.get("/chat/{id}")
async def read_item(request: Request, id: str):
return templates.TemplateResponse("chat.html", {"request": request, "id": id})html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>聊天1</title>
</head>
<body>
<h1>User{
{id}} Chat</h1>
<form action="" onsubmit="sendMessage(event)">
<input type="text" id="messageText" autocomplete="off"/>
<button>Send</button>
</form>
<ul id='messages'>
</ul>
<script>
var ws = new WebSocket("ws://127.0.0.1:5200/api/chat/ws/user{
{id}}");
ws.onmessage = function(event) {
var messages = document.getElementById('messages')
var message = document.createElement('li')
var content = document.createTextNode(event.data)
message.appendChild(content)
messages.appendChild(message)
};
function sendMessage(event) {
var input = document.getElementById("messageText")
ws.send(input.value)
input.value = ''
event.preventDefault()
}
</script>
</body>
</html>