Spring Expression Language

• Support passing and executing expression with help of @value annotation.
• To get a bean by id to set property type we can Use @value(“#{student}”).
• We can pass classes, variable methods, Constructors and objects in the expression.
• For example @value(“{expression}”)
• We can also use symbols like char, Numbers, operator , keywords And special symbols which turn our value
• @value(“#{3+5}”)
• @value(“#{8>6?88:55}”)
• We can call static methods, object, methods and variables.
• To invoke static method and variable. In spring expression, we use following methods.
• T(classname).method(Param)
• T(classname).variable
• For example if we want to invoke sqrt method of java.lang.math we will invoke as follows
• T(java.lang.math).sqrt(5).
• For Objects
• new Object(Value)
• For Boolean type with Spring Programming Expresson Language(SPEL)
• @value(“#{8>3}”)
• We need to place an expression which resolves in Boolean.