我在Scala中定义了以下单例
package main
import javax.inject._
@Singleton
class Properties {
val timeout = 120
}
如何从其他程序访问它？我尝试了main.Properties.timeout但是它抛出了一个编译错误，说没有找到一个伴随对象
答案 0 :(得分：1)
如果您想以您所提及的方式访问它：from django import forms
from django.contrib.auth import authenticate, get_user_model, login, logout
from django.contrib.auth.forms import UserCreationForm
User = get_user_model
class UserLoginForm(forms.Form):
username = forms.CharField()
password = forms.CharField(widget=forms.PasswordInput)
def clean(self, *args, **kwargs):
username = self.cleaned_data.get("username")
password = self.cleaned_data.get("password")
user = authenticate(username=username, password=password)
#user_qs = User.objects.filter(username=username)
#if user_qs.count() == 1:
# user = user_qs.first()
if username and password:
user = authenticate(username=username, password=password)
if not user:
raise forms.ValidationError("This user does not exist.")
if not user.check_password(password):
raise forms.ValidationError("Incorrect password.")
if not user.is_active:
raise forms.ValidationError("User is not active.")
return super(UserLoginForm, self).clean(*args, **kwargs)
class InceptionForm(forms.ModelForm):
email2 = forms.EmailField(label='Confirm Email')
class Meta:
model = User
fields = ('username', 'email', 'password1', 'password2')
，请改为使用随播对象：
main.Properties.timeout使用class Properties {
// ...
}
object Properties {
val timeout = 120
// ...
}
注释，您必须在某处注入该服务，才能使用它。所以像这样：
@Singleton以下是关于PlayFramework的DI的文档：https://www.playframework.com/documentation/2.5.x/ScalaDependencyInjection - 最新的（不是2.0），但它是一个很好的起点。