What does jsp c: mean?

The ":c" tag in jsp is the core tag library in jstl. How to use it: 1. "" displays data in jsp, which is equivalent to "<%=. ..%>"; 2. "" is used to save data, variables and objects; 3. "" 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.: Displaying data in jsp is equivalent to <%=...%>

Syntax:

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

escapeXml: Whether to escape the characters "<", ">", "&", " ' ", " " "

default: Display when the value is empty

2.: 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.: Used to delete variables within the specified scope

Syntax:

<c:remove var="变量名" scope="作用域"/>

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

Syntax:

<c:catch var="变量名"></c:catch>

5. The judgment statement has no else function

Grammar:

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

6. is equivalent to the switch statement in java used with and

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. 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.

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. Used to pass parameters to included or redirected pages

10.Iterative 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.Redirect 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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