jstl_core标签库

先导入这个

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

1

<c:out>输出标签  value代表输出

<c:out value="${param.action }"></c:out>

2

<c:if>标签 test代表判断值

<c:if test="${param.action=='dd'}">
<c:out value="${param.text }"></c:out>
</c:if>

<c:set var="salary" scope="session" value="${2000*2}"/>
<c:if test="${salary > 1}">

3

choose ,otherwise

<c:choose>
<c:when test="${param.text >3}">
when<br>
</c:when>
<c:otherwise>
otherwise
</c:otherwise>
</c:choose>

4

var定义变量，begin初始值，end结束条件，step控制步长

<c:forEach var="number" begin='2' end='100' step='2'>
<div>${number }</div>
</c:forEach>

5

list循环,items=${personList} var="person"

<c:forEach  items="${personList }" var="person">

辅助代码

    List<Person> personList = new ArrayList<Person>();
    Person person1 = new Person();
    person1.setName("huanggabin");
    person1.setAge(2);
    Person person2 = new Person();
    person2.setName("xiaoming");
    person2.setAge(2);
    personList.add(person1);
    personList.add(person2);
    request.setAttribute("personList",personList);//一定要加，保存到request中

6

set标签，var 定义变量，value设置属性值，scope设置范围,target设置对象，（就是var 和target互补吧

然后有了target同时要出现property，使用set可以代替，<jsp:bean><jsp:setProperty> (当然在request添加了这个对象

    <c:if test="$param.name != null">
        <c:set target="${person }" property="name" value="${param.name }"></c:set>
        ${person.name}
        <c:set target="${person }" property="age" value="${param.age }"></c:set>
        ${person.age}
    </c:if>

7

<c:catch var ="catchException">
   <% int x = 5/0;%>
</c:catch>

<c:if test = "${catchException != null}">
   <p>The exception is : ${catchException} <br />
   There is an exception: ${catchException.message}</p>
</c:if>

8

<c:redirect url="http://www.baidu.com">
    <c:param name="people" value="huanggabin"></c:param>
</c:redirect>