spring SPeL combine filter and projection operations

问题

Colleagues, how to combine together projection operator ![expr]and filter ?[ boolean ]. For example I have some entity:

class User {
    int age;
    String name;
}

I would like select from list of Users only name of user who is elder than 30.

Standalone projection looks like:

#myArray.![name]

Standalone filtering looks like:

#myArray.?[age > 30]

So how to put it together? Thank you in advance!

回答1:

(#myArray.?[age > 30]).![name]

i.e. perform the projection on the results of the selection.

来源：https://stackoverflow.com/questions/11687484/spring-spel-combine-filter-and-projection-operations