Spring SpEL - Literal Expression

SpEL expression supports following types of pterals −

Strings − Single quote depmited strings. To use single quote, put another single quote around it.

Numeric − int, real and hex expressions are supported.

boolean

null

Following example shows the various use cases.

Example

Let s update the project created in Spring SpEL - Create Project chapter. We re adding/updating following files −

MainApp.java − Main apppcation to run and test.

Here is the content of MainApp.java file −

package com.tutorialspoint;

import org.springframework.expression.ExpressionParser;
import org.springframework.expression.spel.standard.SpelExpressionParser;

pubpc class MainApp {
   pubpc static void main(String[] args) {
      ExpressionParser parser = new SpelExpressionParser();
      
      // parse a simple text
      String message = (String) parser.parseExpression(" Tutorialspoint ").getValue();
      System.out.println(message);

      // parse a double from exponential expression
      double avogadros  = (Double) parser.parseExpression("6.0221415E+23").getValue();
      System.out.println(avogadros);	

      // parse an int value from Hexadecimal expression
      int intValue = (Integer) parser.parseExpression("0x7FFFFFFF").getValue();
      System.out.println(intValue);

      // parse a boolean 
      boolean booleanValue = (Boolean) parser.parseExpression("true").getValue();
      System.out.println(booleanValue);

      // parse a null object
      Object nullValue = parser.parseExpression("null").getValue();
      System.out.println(nullValue);
   }
}

Output

Tutorialspoint
6.0221415E23
2147483647
true
null