Jakarta Commons Jexl 起步

import org.apache.commons.jexl.Expression;
import org.apache.commons.jexl.JexlHelper;
import org.apache.commons.jexl.JexlContext;
import org.apache.commons.jexl.ExpressionFactory;

/**
* Created by IntelliJ IDEA.

* User: leizhimin

* Date: 2008-8-16 19:14:39

* Apache Commons JEXL
*/
public class TestJexl {
    public static void main(String[] args) throws Exception {
        testBasic();
    }

    public static void testBasic() throws Exception {
        Person person = new Person("zhangsan", "men", 22);

        JexlContext jexlContext = JexlHelper.createContext();
        jexlContext.getVars().put("country", person.country);
        jexlContext.getVars().put("person", person);

        /* 创建一个表达式country */
        Expression expression1 = ExpressionFactory.createExpression("country");
        /* 结合上下文对表达式求值 */
        Object message1 = expression1.evaluate(jexlContext);
        System.out.println("对表达式 country 求值结果: " + message1);

        Expression expression2 = ExpressionFactory.createExpression("person.getName()");
        Object message2 = expression2.evaluate(jexlContext);
        System.out.println("对表达式 person.getName() 求值结果: " + message2);

        Expression expression3 = ExpressionFactory.createExpression("person.getName().length()");
        Object message3 = expression3.evaluate(jexlContext);
        System.out.println("对表达式 person.getName().length() 求值结果: " + message3);

        Expression expression4 = ExpressionFactory.createExpression("person.getAge()");
        Object message4 = expression4.evaluate(jexlContext);
        System.out.println("对表达式 person.getAge() 求值结果: " + message4);

    }
}
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