What does jsp c: mean?

The ":c" tag in jsp is the core tag library in jstl. How to use it: 1. "460bc2a84a9d80a4ca4e609feaa76aeb" displays data in jsp, which is equivalent to "0553bdf104956362828f416e47f66e9e"; 2. "99c48a975ea0aa6890fdc4cc57d09a26" is used to save data, variables and objects; 3. "877f2778b3e33901451e8fad5187af59" is used to delete variables within the specified scope.

##Use of c tags in jsp

The c tag is the core tag library in jstl

1.460bc2a84a9d80a4ca4e609feaa76aeb: Displaying data in jsp is equivalent to dae4c36fc931dafe9ee9ed85cc9291c2

Syntax:

<c:out value="值" escapeXml="{true|false}" default="默认值">

escapeXml: Whether to escape the characters "6745434bf92a2979d589ede8e8e7bea9", "&", " ' ", " " "

default: Display when the value is empty

2.99c48a975ea0aa6890fdc4cc57d09a26: Used to save data, save variables and objects

Syntax:--Variable

<c:set value="值" var="变量名" scope="变量的作用域"></c:set>

--Object

 <c:set target="对象名" property=" 对象属性名" scope="变量的作用域"></c:set>

3.877f2778b3e33901451e8fad5187af59: Used to delete variables within the specified scope

Syntax:

<c:remove var="变量名" scope="作用域"/>

4.c15b85348bb0446c9878788d72d8f1e3 is used to handle exceptions that cause errors and save error information

Syntax:

<c:catch var="变量名"></c:catch>

5.d0d9bdab4076eea66045fa63123be3ee The judgment statement has no else function

Grammar:

<c:if test="${my eq &#39;dd&#39;}"></c:if>

6.4436be787af99f07ea780cfa8beb043f is equivalent to the switch statement in java used with c67f168fbaabaed338c344018064d87b and 4f0025edc9390e9c4378bf0fe8018e26

Grammar:

<c:choose>
<c:when test="${my eq &#39;w&#39;}"></c:when>
<c:when test="${my eq &#39;g&#39;}"></c:when>
<c:otherwise></c:otherwise>
</c:choose>

7.8f86ca20bf479ad0d2cad5e574c19d8a Equivalent to java’s for loop

Syntax:

<c:forEach items="${保存在作用域的变量名}" var="用来循环的名" varStatus="status" begin="开始" end="结束">
</c:forEach>
<c:forEach items="${infoList}" var="info" varStatus="status">
<c:if test="${status.index%4==0}"><tr></c:if>
<td>${info.id}</td>
<td>${info.type}</td>
<c:if test="${(status+1)%4==0}"</tr></c:if>
-------功能是循环四个后实现换行

8.cdb3805963f4844f4ce3a610412e3432

can be used Single label, jump to the specified page

<a href="<c:url value=&#39;top.jdp&#39;/>"

Set url

<c:url value="http://www.baidu.com" var="baidu"> 
<c:param name="name" value="宝宝"/>
<c:param name="age" value="29"/>
</c:url>

Finally form http://www.baidu.com?name='Baby'&age=29

9.ee8745f4240b31ad686f9abbc2e4e5fc Used to pass parameters to included or redirected pages

10.2ae5a643b4a81fc8fb5b985b58a0336cIterative output string

 <c:forTokens items="字符串" delims="分界符" var="变量名"
          varStatus="遍历状态名" begin="begin" end="end" step="sep">
            标签体     
    </c:forTokens>

11.2e7cd64b6af9a12ea19873b9d0eb65a5Redirect to a new URL

<c:redirect url="地址" context="上下文路径">
         <c:param/>标签 --------------可以不写
</c:redirect>

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