如何制作共享/实用程序支持bean？

Question

i have several pages that shares specific part of the page let's say for example a groups of checkboxes that display all users with ability to search in those users, so i am thinking of grouping the UI part in a facelet so i can include it in other pages, and for the server side part i am thinking of make a sessionScoped bean that contains the methods and properties for that page, what do you think about this approach ? please advise, thanks.

UPDATE: there's an important concern, is that should i make the methods in that bean synchronized so that it will return different values for different requests , i mean not to return same results for different requests ?

Answer 1

是的，听起来不错，只要不太沉重，就可以将这些内容放入会话范围

Answer 2

Use request scoped bean instead of session scoped. Use lazy-loading pattern for such things. Separating common resources in other bean is a good solution

class CommonsBean {
    private List<User> users;

    public List<User> getUsers() {
      if (users == null) {
          users = // here some code to load it from DB
      }
      return users;
    }

}