JSTL_1

1.out set

    <% request.setAttribute("abc", "<font style='color:red'>你好</font>"); %>
    <c:out value="${abc}" escapeXml="true">默认值</c:out><br>
    <c:set var="name" value="李四"/>
    ${name}<br>

给Javabean设置值

    <jsp:useBean id="user" class="com.lps.pojo.Users"></jsp:useBean>
    <c:set target="${user}" property="userName" value="王五"></c:set>
    ${user.userName }<br>

---

2.if

将判断结果以 对象 result 存入 request区间
scope：区间范围

    <c:if test="${1+1==2}" var="result" scope="request">
        正确了则显示
    </c:if>
    ${result}<br>

---

3.c:choose

    <c:choose>
        <c:when test="${a==1}">1的值</c:when>
        <c:when test="${a==2}">2的值</c:when>
        <c:when test="${a==3}">3的值</c:when>
        <c:otherwise>都不是</c:otherwise>
    </c:choose><br>

---

4.c:forEach

step：每次跳过几个

    <c:forEach begin="1" end="10" step="1">
        a
    </c:forEach><br>

${status.index}：索引${status.count}：已经显示的数量
${status.first}：是不是第一个${status.last}：是不是最后一个

    <%
        List<String> list=new ArrayList<String>();
        list.add("abc");
        list.add("def");
        list.add("hij");
        request.setAttribute("list", list);
    %>

    <c:forEach var="str" items="${list}" varStatus="status">
        ${str }:${status.index},${status.count},${status.first},${status.last}<br>
    </c:forEach><br>

---

6.c:forTokens

以“，”分割字符串

    <c:forTokens var="str"  items="a,b,c" delims=",">
        ${str }<br>
    </c:forTokens>