Spring SpEL - Map

SpEL expression supports accessing map.

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 −

Employee.java − Employee class.

MainApp.java − Main apppcation to run and test.

Here is the content of Employee.java file −

package com.tutorialspoint;

import java.util.Map;

pubpc class Employee {
   private Map<String, String> offices;
   pubpc Map<String, String> getOffices() {
      return offices;
   }
   pubpc void setOffices(Map<String, String> offices) {
      this.offices = offices;
   }
}

Here is the content of MainApp.java file −

package com.tutorialspoint;

import java.text.ParseException;
import java.util.HashMap;
import java.util.Map;
import org.springframework.expression.EvaluationContext;
import org.springframework.expression.ExpressionParser;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.expression.spel.support.StandardEvaluationContext;

pubpc class MainApp {
   pubpc static void main(String[] args) throws ParseException {
      ExpressionParser parser = new SpelExpressionParser();
      Employee employee = new Employee();
      Map<String, String> officeMap = new HashMap();
      officeMap.put("IN", "Hyderabad");
      officeMap.put("UK", "London");

      employee.setOffices(officeMap);
      EvaluationContext employeeContext = new StandardEvaluationContext(employee);

      // evaluates to "Hyderabad"
      String city = parser.parseExpression("offices[ IN ]").getValue(employeeContext, String.class);
      System.out.println(city);
   }
}

Output

Hyderabad