@specializes 和 @Named Java
当您创建新视图时，应使用 @Named 注释。但是，如果视图应该是已经存在的类的扩展，那么应该如何实现。要覆盖类中的方法，我使用以下命令：
@ViewScoped
@Specializes
public class classB extends class A{
@Override
public String save(){
}
}
这允许我保留已经生成的实体。
但视图需要有以下注释：
@Named
@ViewScoped
@URLMapping()
public class classB extends class A{
//content
}
这应该如何在一个类中实现？鉴于这两个注释不能共存？
When you are creating a new view the @Named annotation should be used. However, if the view should be an extension of a class that already exists, how should this be achieved. To overwrite a method in the class I use the following:
@ViewScoped
@Specializes
public class classB extends class A{
@Override
public String save(){
}
}
This allows me to keep the already generated entity.
But the view needs to have the following annotations:
@Named
@ViewScoped
@URLMapping()
public class classB extends class A{
//content
}
How should this be achieved in one class? Given the two annotations cannot coexist?
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这个问题的答案取决于实体最初是如何创建的。如果要扩展管理实体的类，则必须创建单独的视图。这意味着一个命名类是管理实体的类的扩展。
此后，您必须创建一个与所创建的新命名视图相关的 JSF 页面。
如果存在信息传输，则必须使用专门注释创建适当的扩展类才能访问实体。
如果您尝试操作新视图类中的实体，您将导致合并错误，因为程序已经认为该实体存在于数据库中。
The answer to this question depends on how the entity was originally created. If you are extending a class that manages an entity, you must create a separate view. That means one named class that is an extension of the class managing the entity.
After this, you must create a correlating JSF page to that new named view that was created.
If there is a transfer of information, you must create a proper extended class with the specializes annotation to have access to the entity.
If you attempt to manipulate the entity in the new view class you will cause a merge error because the program already thinks the entity exists in the database.