spring Spring Expression Language (SpEL) Syntax Reference
Example
You can use @Value("#{expression}") to inject value at runtime, in which the expression is a SpEL expression.
Literal expressions
Supported types include strings, dates, numeric values (int, real, and hex), boolean and null.
"#{'Hello World'}" //strings
"#{3.1415926}" //numeric values (double)
"#{true}" //boolean
"#{null}" //null
Inline list
"#{1,2,3,4}" //list of number
"#{{'a','b'},{'x','y'}}" //list of list
Inline Maps
"#{name:'Nikola',dob:'10-July-1856'}"
"#{name:{first:'Nikola',last:'Tesla'},dob:{day:10,month:'July',year:1856}}" //map of maps
Invoking Methods
"#{'abc'.length()}" //evaluates to 3
"#{f('hello')}" //f is a method in the class to which this expression belongs, it has a string parameter
