Spring Expression Language (SpEL)

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Syntax Reference

You can use @Value(“#{expression}”) to inject value at runtime, in which the expression is a SpEL expression.

1Literal 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

2Inline list

  • “#{1,2,3,4}” //list of number
  • “#{{‘a’,’b’},{‘x’,’y’}}” //list of list

3Inline Maps

  • “#{name:’Nikola’,dob:’10-July-1856′}”
  • “#{name:{first:’Nikola’,last:’Tesla’},dob:{day:10,month:’July’,year:1856}}” //map of maps

4Invoking 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

SpEL is a powerful, well-supported expression language that can be used across all the products in the Spring portfolio. It can be used to configure Spring applications or to write parsers to perform more general tasks in any application.

 

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