6.2 功能概述
表达式语言支持以下功能
- Literal expressions(文字表达)
 - Boolean and relational operators(布尔和关系运算)
 - Regular expressions(正则表达式)
 - Class expressions(类表达式)
 - Accessing(访问) properties, arrays, lists, maps
 - Method invocation(方法调用)
 - Relational operators(关系运算)
 - Assignment(分配)
 - Calling constructors(调用构造函数)
 - Bean references(Bean引用)
 - Array construction(数组构造)
 - Inline lists(内联集合)
 - Inline maps(内联映射)
 - Ternary operator(三元操作)
 - Variables(变量)
 - User defined functions(用户定义的功能)
 - Collection projection(集合投影)
 - Collection selection(集合选择)
 - Templated expressions(模板表达式)