Google应用引擎在cod中的缺陷

2024-04-19 14:55:12 发布

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我的代码是：

import webapp2
import re
form = """<html>
<form method=post>
<input name="username"><div id=div>%s</div><br>
<input name="password"><div id=div>%s</div><br>
<input name="verify"><div id=div>%s</div><br>
<input name="email"><div id=div>%s</div>
<input type="submit">
</form>
</html>"""
class MainPage(webapp2.RequestHandler):
  def get(self):
      self.response.headers['Content-Type'] = 'text/html'
      self.response.write(form % ('','','',''))

  def reply(self,user,password,verify,email):
      if not user and password and verify and email:
        self.redirect('/broski')
      else:
        self.response.write(form % (user,password,verify,email))

  def post(self):
      self.usererror = ''
      if not re.compile(r"^[a-zA-Z0-9_-]{3,20}$").match(self.request.get('username')):
       self.usererror = "That's not a valid username."
      self.passworderror = ''
      if not re.compile(r"^.{3,20}$").match(self.request.get('password')):
        self.passworderror = "That wasn't a valid password."
      self.verifyerror = ''
      if self.request.get('verify') != self.request.get('password') and self.request.get('password') != '':
        self.verifyerror = "Your passwords didn't match."
      self.emailerror = ''
      if not re.compile(r"^[\S]+@[\S]+\.[\S]+$").match(self.request.get('email')):
        self.emailerror = "That's not a valid email."
      self.reply(usererror,passworderror,verifyerror,emailerror)

class ThankYo(webapp2.RequestHandler):
  def get(self):
      self.response.write('Welcome, ' + self.request.get('username')+'!')

app = webapp2.WSGIApplication([('/', MainPage),('/broski', ThankYo)],
                              debug=True)

这简直是我第一次为GAE（我对python还是个新手……）编写一个超过10行的代码，当然，他已经崩溃了。 我发现了几个错误，但绝对的帮助，因为该网站仍然没有甚至加载。 关于代码的帮助是非常感谢的。 更新：我更新了一点（更改了ThankYo的继承），现在表单成功加载，当我发布数据时，它当然崩溃了。。。你知道吗


Tags： nameselfdivreforminputgetif
1条回答
网友
1楼 · 发布于 2024-04-19 14:55:12
class ThankYo(Mainpage):

应该是

class ThankYo(MainPage):

（注意大写P）。你知道吗

我通过查看终端中留下的错误消息发现了这一点：

% dev_appser  File "/home/unutbu/pysrc/project/main.py", line 38, in <module>
...
    class ThankYo(Mainpage):   
NameError: name 'Mainpage' is not defined

也会改变

self.reply(usererror,passworderror,verifyerror,emailerror)

至

self.reply(self.usererror, self.passworderror, self.verifyerror, self.emailerror)

我通过查看终端错误消息再次发现了这一点：

  File "/home/unutbu/pysrc/project/main.py", line 39, in post
    self.reply(usererror, passworderror, verifyerror, emailerror)
NameError: global name 'usererror' is not defined

如何查看错误消息（从终端）：

启动GAE服务器有多种方法。我的方法是打开一个终端

dev_appserver.py /path/to/project/

然后终端会发出有用的错误消息。你知道吗

最后一个问题有点复杂。我们正在向reply方法发送错误消息：

self.reply(self.usererror, self.passworderror, self.verifyerror, self.emailerror)

但是在reply方法定义中，我们称它们为user、password、verify和email。这会导致认知失调。让我们将它们重命名为usererror、passworderror、verifyerror和emailerror：

def reply(self, usererror, passworderror, verifyerror, emailerror):

现在要检查是否存在错误，请使用：

if not any(usererror and passworderror and verifyerror and emailerror):

但是我们要重定向到的页面需要用户名！ 如果我们重定向到/broksi：

        self.redirect('/broski')

然后ThankYo处理程序不知道用户名是什么。self.request.get('username')将显示为空（返回空字符串）。所以我们需要将用户名传递给broski：

import urllib

self.redirect('/broski?' + urllib.urlencode(
            {'username' : self.username}))

所以代码最终是这样的：

import urllib
import webapp2
import re
form = """<html>
<form method=post>
<input name="username"><div id=div>%s</div><br>
<input name="password"><div id=div>%s</div><br>
<input name="verify"><div id=div>%s</div><br>
<input name="email"><div id=div>%s</div>
<input type="submit">
</form>
</html>"""


class MainPage(webapp2.RequestHandler):
    def get(self):
        self.response.headers['Content-Type'] = 'text/html'
        self.response.write(form % ('', '', '', ''))

    def reply(self, usererror, passworderror, verifyerror, emailerror):
        if not any(usererror and passworderror and verifyerror and emailerror):
            self.redirect('/broski?' + urllib.urlencode(
                {'username' : self.username}))
        else:
            self.response.write(form % (user, password, verify, email))

    def post(self):
        self.username = self.request.get('username')
        self.password = self.request.get('password')
        self.verify = self.request.get('verify')
        self.email = self.request.get('email')
        self.usererror = ''
        if not re.compile(r"^[a-zA-Z0-9_-]{3,20}$").match(self.username):
            self.usererror = "That's not a valid username."
        self.passworderror = ''
        if not re.compile(r"^.{3,20}$").match(self.password):
            self.passworderror = "That wasn't a valid password."
        self.verifyerror = ''
        if self.verify != self.password and self.password != '':
            self.verifyerror = "Your passwords didn't match."
        self.emailerror = ''
        if not re.compile(r"^[\S]+@[\S]+\.[\S]+$").match(self.email):
            self.emailerror = "That's not a valid email."
        self.reply(self.usererror, self.passworderror, self.verifyerror, self.emailerror)


class ThankYo(MainPage):
    def get(self):
        self.response.write('Welcome, ' + self.request.get('username') + '!')

app = webapp2.WSGIApplication([('/', MainPage), ('/broski', ThankYo)],
                              debug=True)

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