Jsp 无法解析${}

错误原因1：未导包

解决：

• maven依赖

         <!-- JSTL for JSP -->
        <!-- https://mvnrepository.com/artifact/javax.servlet/jstl -->
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>jstl</artifactId>
        </dependency>       
        <!-- https://mvnrepository.com/artifact/taglibs/standard -->
        <dependency>
            <groupId>taglibs</groupId>
            <artifactId>standard</artifactId>
            <version>1.1.2</version>
        </dependency>

• 手动导入

  
  
  图1.png

错误原因2：配置

解决：

在首行设置isELIgnored为false，即不忽略EL表达式

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8" isELIgnored="false"%>