maven 中使用jstl
1. maven 中添加依赖：
??????? <dependency>
??? ??? ??? <groupId>jstl</groupId>
??? ??? ??? <artifactId>jstl</artifactId>
??? ??? ??? <version>1.1.2</version>
??? ??? </dependency>
??? ??? <dependency>
??? ??? ??? <groupId>taglibs</groupId>
??? ??? ??? <artifactId>standard</artifactId>
??? ??? ??? <version>1.1.2</version>
??? ??? </dependency>
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2. jsp中引入 jstl：
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c"%>
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