BE THE CODER > Spring > Expression Language

The Spring Expression Language (SpEL) is a simple and powerful expression language which helps to query and manipulate objects at runtime. The following example shows defining a variable map using SpEL.

File Name :	com/bethecoder/tutorials/spring3/tests/spel/VariableMapTest.java
Author :	Sudhakar KV
Email :	[email protected]


package com.bethecoder.tutorials.spring3.tests.spel;



import java.util.HashMap;

import java.util.Map;



import org.springframework.expression.ExpressionParser;

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

import org.springframework.expression.spel.support.StandardEvaluationContext;



import com.bethecoder.tutorials.spring3.basic.Employee;



public class VariableMapTest {



  /**

   * @param args

   */

  public static void main(String[] args) {



    StandardEvaluationContext stdContext = new StandardEvaluationContext();

    //Define a variable map

    Map<String, Object> variables = new HashMap<String, Object>();

    variables.put("org", "BTC");

    variables.put("emp", new Employee(1, "ABC", 9999));

    stdContext.setVariables(variables);

    

    ExpressionParser parser = new SpelExpressionParser();

    String value = parser.parseExpression("#org").getValue(stdContext, String.class);

    System.out.println(value);

    

    value = parser.parseExpression("#emp.salary").getValue(stdContext, String.class);

    System.out.println(value);

    

    boolean resp = parser.parseExpression(

        "#org == 'BTC'").getValue(stdContext, boolean.class);

    

    System.out.println(resp);

  }



}

Variable Map