The Spring Expression Language (“SpEL” for short) is a powerful expression language that supports querying and manipulating an object graph at runtime. It is a single well supported within the Spring community, but it is self-contained and can be used independently. SpEL supports calling methods, accessing properties, and calling constructors.
The SpEL classes and interfaces are located in the org.springframework.expression package
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-expression</artifactId>
<version>5.3.1</version>
</dependency>
You can use SpEL expressions with XML-based or annotation-based configuration metadata for defining BeanDefinition instances. In both cases, the syntax to define the expression is of the form #{ <expression string> }, and meanwhile SpEL provides relational, equality, and logical operations.
@Value("#{environment['app.profile']=='prod'}")
private Boolean isProduction;
All of the textual operators are case-insensitive. lt (<) gt (>) le (<=) ge (>=) eq (==) ne (!=) div (/) mod (%) not (!).
Logical Operators SpEL supports the following logical operators: and (&&) or (||) not (!)
