from flask import Flask,flash,render_template,request
app = Flask(__name__)
app.secret_key ='123' # 此处一定要有app.secret_key, 至于为什么还没搞明白
@app.route('/')
def hello_world():
flash("hello jikexueyuan")
return render_template("index.html")
@app.route('/login', methods=['POST'])
def login():
form = request.form
username = form.get('username')
password = form.get('password')
if not username:
flash("please input username00")
flash("please input username01")
return render_template( "index.html")
if not password:
flash("please input password00")
flash("please input password01")
return render_template("index.html")
if username == 'jikexueyuan' and password == '123456':
flash ( "login success")
return render_template("index.html")
else:
flash("username or password is wrong")
return render_template("index.html")
@app.errorhandler(404) # 找不到该路由时,走这个路由
@app.errorhandler(403) # 找不到该路由时,走这个路由
def not_found(e):
return render_template("404.html")
@app.route('/users/<user_id>')
def users(user_id):
if int(user_id) == 1:
return render_template("user.html")
else:
abort(403)
# abort(404)
if __name__ == '__main__':
app.run()
对应的index.html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>首页</title>
</head>
<body>
<h1>hello login</h1>
<form action="/login" method="post">
<input type="text" name="username">
<input type="password" name="password">
<input type="submit" name="Submit">
</form>
<h2>{{ get_flashed_messages()[0] }}</h2>
<h2>{{ get_flashed_messages()[1] }}</h2>
<h2>{{ get_flashed_messages() }}</h2>
</body>
</html>
404.html
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
</head>
<body>
<h1>你要找的页面去火星了</h1>
<h2>抱歉！该页面不存在</h2>
</body>
</html>
另一个abort样式
* encoding: utf-8 * @author: ty hery 2019/12/20
from flask import Flask, request, abort, Response
from werkzeug.routing import BaseConverter
app = Flask(name)
@app.route('/login',methods=['GET'])
def login():
name = ""
pwd = ""
if name != 'zhangsan' or pwd != 'admin':
# 使用abort函数可以立即终止视图函数的执行
# 并可以返回给前端特定的信息
# 1,传递状态码信息,必须是标准的http状态码
# abort(403) # 状态码403 forbiden
# abort(404) # 状态码404 Not Found
# 2,传递响应体信息
resp = Response('login failed')
# abort(resp)
abort(Response('login failed 去死吧'))
return 'login success'
定义错误处理的方法
@app.errorhandler(404)
@app.errorhandler(403)
def handler_404_error(err):
'''自定义处理404错误的方法,这个函数返回值是前端用户看到的最终结果'''
return u"出现了404错误了,错误信息:%s" %err
if name == 'main':
print('--哈哈01--',app.url_map,'--哈哈01--')
app.run(debug=True)