jsp
在html中可以写java代码
本质:servlet
指令
<%@ page contentType="text/html;charset=UTF-8" errorPage="index.jsp" language="java" %>
<%@include file="login.html" %> <!-- 引进相同的页面 -->
<%@ taglib prefix="" %> <%--引入标签库--%>
MVC模式
1.Model:模式,业务操作–javaBean
2.View:视图,展示数据–JSP
3.Controller:控制器–Servlet
EL表达式
格式
${3 > 4}
\${3 > 4} <%--忽略el表达式--%>
获取共享数据
<%
request.setAttribute("zhangsan","hello");
%>
${requestScope.zhangsan}
JSTL
jsp标准标签库
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
格式
<%
request.setAttribute("number",3);
%>
<c:if test="${number % 2 != 0}">
${number}为奇数
</c:if>
<c:choose>
<c:when test="${number == 1}">星期一</c:when>
<c:when test="${number == 2}">星期一</c:when>
<c:when test="${number == 4}">星期一</c:when>
<c:when test="${number == 1}">星期一</c:when>
<c:when test="${number == 1}">星期一</c:when>
<c:when test="${number == 1}">星期一</c:when>
<c:when test="${number == 1}">星期一</c:when>
<c:otherwise>....</c:otherwise>
</c:choose>
<c:forEach begin="1" end="10" var="i" step="1">
${i}<br>
</c:forEach>
<%-- 遍历容器 --%>
<c:forEach items="${list}" var="str" varStatus="s">
${s.index} ${s.count} ${str}
</c:forEach>