Jsp 無法解析${}

錯誤原因1：未導包

解決：

• maven依賴

<!-- 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>
           

• 手動導入

  

  圖1.png

錯誤原因2：配置

在首行設定isELIgnored為false，即不忽略EL表達式

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