ressionEvaluationUtils的替代方法是评估方法

ressionEvaluationUtils的替代方法是评估方法

本文介绍了Spring已弃用的ExpressionEvaluationUtils的替代方法是评估方法吗?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

自上课以来:
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.ExpressionEvaluationUtilsis 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)

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09-03 04:56