Use the JSTL foreach and if when labels.

Use the JSTL foreach and if when labels.

Add the following tag library and function library to jsp

<% @ Taglib uri = "http://java.sun.com/jsp/jstl/core" prefix = "c" %> // required <% @ taglib uri = "http://java.sun.com/jsp/jstl/fmt" prefix = "fmt" %> // some formatting is required parameter, not Required

<% @ Taglib prefix = "fn" uri = "http://java.sun.com/jsp/jstl/functions" %> // the function to be used when processing data, not required

 

 

1. Traverse list <Object>

<C: forEach items = "$ {list}" var = "list" varStatus = "status">

$ {List. name}

</C: forEach>

 

2. Traverse list <String>

<C: forEach items = "$ {optList}" var = "optList" varStatus = "status">

$ {OptList}

</C: forEach>

 

3. Traverse list <Map <String, String>

<C: forEach var = "name" items = "$ {a}"> <c: forEach var = "entry" items = "$ {name}"> <c: out value = "$ {entry. key} "/> <c: out value =" $ {entry. value} "/> </c: forEach>

 

4. Traverse map

<C: forEach items = "$ {map}" var = "mymap"> <c: out value = "$ {mymap. key} "/> <c: out value =" $ {mymap. value} "/> </c: forEach>

 

5. if

Add

<c:if test="${salary > 2000}">   <p>My salary is: <c:out value="${salary}"/><p></c:if>

6. choose tag

<C: choose>

<C: when test = "$ {param <= 2}">

1 </c: when>

<C: when test = "$ {param >=2}">

2 </c: when> <c: otherwise>

$ {Param}

</C: otherwise> </c: choose>

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