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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 −
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Employee.java − Employee class.
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MainApp.java − Main application to run and test.
Here is the content of Employee.java file −
package com.tutorialspoint; import java.util.Map; public class Employee { private Map<String, String> offices; public Map<String, String> getOffices() { return offices; } public 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; public class MainApp { public 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
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