springspring-expression-languagespring-expression

To use expression language to get values

My expression is :#age*10 And I assigned a value of 15.6 to age The result of this is 156.0 In fact the final result I want to get is：156

I can do it in the code, but how to do it by modifying the expression.

thanks

Solution

  • You need to use Integer.class as shown below:

    import org.springframework.expression.Expression;
import org.springframework.expression.ExpressionParser;
import org.springframework.expression.spel.standard.SpelExpressionParser;
import org.springframework.expression.spel.support.StandardEvaluationContext;

public class Demo {
    public static void main(String[] args) {
        ExpressionParser parser = new SpelExpressionParser();
        StandardEvaluationContext context = new StandardEvaluationContext();
        Double age = 15.6;
        context.setVariable("age", age);
        Expression exp = parser.parseExpression("#age*10");
        int result = exp.getValue(context, Integer.class);
        System.out.println(result);
    }
}

    Output:

    156