1. 条件标签 JSTL
< c: if test = " ${user.password == 'hello'} " >
< c:choose >
< c:when test = " ${user.age <= 18} " >
< font color = " blue " />
</ c:when >
< c:when test = " ${user.age <= 30 && user.age > 18} " >
< font color = " red " />
</ c:when >
< c:otherwise >
< font color = " green " />
</ c:otherwise >
</ c:choose >
</ c: if >
STRUTS2:
< s: if test = " #user.age <= 18 " >
< font color = " blue " />
</ s: if >
< s:elseif test = " #user.age <= 30 && user.age > 18 " >
< font color = " red " />
</ s:elseif >
< font color = " green " />
</ s: else >
2. 迭代标签JSTL:
< c:forEach var = " user " items = " ${users} " >
< c:out value = " ${user.userName} " />
</ c:forEach > <!-- 迭代固定次数 -->
< c:forEach var = " i " begin = " 1 " end = " 10 " step = " 3 " >
< c:out value = " ${i} " />
</ c:forEach > <!-- 这种循环相当于for( int i = 1 ; i < 10 ; i ++ ), 其中step是指迭代的步长,默认为1. -->
struts2:
< s:iterator value = " #users " status = " stuts " >
< s: if test = " #stuts.odd == true " > <!-- 判断是否为奇数行 -->
< s:property value = " userName " />
</ s: if >
< s: else >
< s:property value = " passWord " />
</ s: else >
</ s:iterator >
3. URL相关标签 JSTL:
<!-- 绝对路径 -->
< c: import url = " http://127.0.0.1:8080/hello/hello.jsp " /> <!-- 相对路径 -->
< c: import url = " hello.jsp " /> <!-- Encode -->
< a href = " <c:url value='hello.jsp'><c:param name='userName' value='cyanbomb' /></c:url> " ></ a > <!-- 传递参数到指定的URL -->
< c: import url = " hello.jsp " charEncoding = " gb2312 " > < c:param name = " userName " value = " cyanbomb " /> </ c: import > <!-- URL重定向 -->
< c:redirect url = " ${myurl} " /> <!-- 构造URL -->
< c:url value = " myurl " var = " hello.jsp " scope = " session " > < c:param name = " userName " value = " cyanbomb " /> </ c:url >
Struts2:
< a href = ' <s:url value="/hello.jsp" /> ' > Hello </ a >< br />
< s:url id = " url " value = " /hello.jsp " > < s:param name = " name " > cyanbomb </ s:param > </ s:url >
< s:a href = " %{url} " > Hello </ s:a >
解除的疑问，list遍历问题
像这样一个list,里面有3条记录,每条记录包含两个对象,我把结果集(lstRooms)request到了页面,想遍历显示RrmRooms里的id,和RrmRoomType里的name. 我用JSTL实现如下:
< table >
< c:forEach var = " rm " items = " ${lstRooms} " >
< tr >
< td > ${rm[ 0 ].id} </ td >
< td > ${rm[ 1 ].name} </ td >
< tr >
</ c:forEach > </ table >
STRUTS2实现如下:
< table >
< s:iterator value = " #lstRooms " status = " stat " >
< tr >
< td >
< s:property value = " #lstRooms[#stat.index][0].id " />
</ td >
< td >
< s:property value = " #lstRooms[#stat.index][1].name " />
</ td >
< tr >
</ s:iterator >
</ table >