Spring已弃用的ExpressionEvaluationUtils的替代方法是评估方法吗？ [英] Alternatives to Spring's deprecated ExpressionEvaluationUtils evaluate methods?

问题描述

自上课以来： org.springframework.web.util.ExpressionEvaluationUtils
自Spring 3.x发布以来已被弃用，我正在为我的java代码中的EL表达式评估寻找另一种选择。

Since the class:org.springframework.web.util.ExpressionEvaluationUtils is deprecated since Spring 3.x release, I am looking for another alternative for EL expression evaluation in my java code.

在阅读JSP 2.x文档后，我确实设法构建了另一种方法：

After reading JSP 2.x documentation, I did manage to construct an alternative method:

import javax.el.ELContext;
import javax.el.ExpressionFactory;
import javax.el.ValueExpression;
import javax.servlet.jsp.JspApplicationContext;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspFactory;
import javax.servlet.jsp.PageContext;


public class ExpressionEvaluationUtils {


    public static Object evaluate(String exp, Class<?> resultClass, PageContext pageContext)
        throws JspException {

        if (pageContext == null){
            return exp;
        }
        ELContext elContext =  pageContext.getELContext();
        JspFactory jf = JspFactory.getDefaultFactory();
        JspApplicationContext jac = jf
                         .getJspApplicationContext(pageContext.getServletContext());
        ExpressionFactory ef = jac.getExpressionFactory();
        ValueExpression val = ef.createValueExpression(elContext, exp, resultClass);
        return val.getValue(elContext);
    }

}

你能否提出更多我的选择实施？

Can you suggest more alternatives to my implementation?

推荐答案

您可以使用以下任何项目：

You could use any of the projects below:

• Apache Commons OGNL


• MVEL


• JBoss EL


• Spring Expression Language（SpEL）

• Apache Commons OGNL
• MVEL
• JBoss EL
• Spring Expression Language (SpEL)

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