For the latest stable version, please use Spring Framework 6.2.0!spring-doc.cn

Literal Expressions

SpEL supports the following types of literal expressions.spring-doc.cn

Strings can delimited by single quotation marks (') or double quotation marks ("). To include a single quotation mark within a string literal enclosed in single quotation marks, use two adjacent single quotation mark characters. Similarly, to include a double quotation mark within a string literal enclosed in double quotation marks, use two adjacent double quotation mark characters.spring-doc.cn

Numbers support the use of the negative sign, exponential notation, and decimal points. By default, real numbers are parsed by using Double.parseDouble().spring-doc.cn

The following listing shows simple usage of literals. Typically, they are not used in isolation like this but, rather, as part of a more complex expression — for example, using a literal on one side of a logical comparison operator or as an argument to a method.spring-doc.cn

ExpressionParser parser = new SpelExpressionParser();

// evaluates to "Hello World"
String helloWorld = (String) parser.parseExpression("'Hello World'").getValue();

// evaluates to "Tony's Pizza"
String pizzaParlor = (String) parser.parseExpression("'Tony''s Pizza'").getValue();

double avogadrosNumber = (Double) parser.parseExpression("6.0221415E+23").getValue();

// evaluates to 2147483647
int maxValue = (Integer) parser.parseExpression("0x7FFFFFFF").getValue();

boolean trueValue = (Boolean) parser.parseExpression("true").getValue();

Object nullValue = parser.parseExpression("null").getValue();
val parser = SpelExpressionParser()

// evaluates to "Hello World"
val helloWorld = parser.parseExpression("'Hello World'").value as String

// evaluates to "Tony's Pizza"
val pizzaParlor = parser.parseExpression("'Tony''s Pizza'").value as String

val avogadrosNumber = parser.parseExpression("6.0221415E+23").value as Double

// evaluates to 2147483647
val maxValue = parser.parseExpression("0x7FFFFFFF").value as Int

val trueValue = parser.parseExpression("true").value as Boolean

val nullValue = parser.parseExpression("null").value