JSTL（c標簽）與Struts2（s標簽）標簽的常用功能對比

1. 條件標簽 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. 迭代標簽
JSTL:   

< c:forEach var = " user " items = " ${users} " >     

< c:out value = " ${user.userName} " />

</ c:forEach > <!-- 迭代固定次數 -->

< c:forEach var = " i " begin = " 1 " end = " 10 " step = " 3 " >    

< c:out value = " ${i} " />

</ c:forEach > <!-- 這種循環相當於for( int i = 1 ; i < 10 ; i ++ ), 其中step是指迭代的步長,默認為1. -->

struts2:

< s:iterator value = " #users " status = " stuts " >      

< s: if test = " #stuts.odd == true " >    <!-- 判斷是否為奇數行 -->         

< s:property value = " userName " />     

</ s: if >     

< s: else >         

< s:property value = " passWord " />

</ s: else >

</ s:iterator >

3. URL相關標簽    JSTL:

<!-- 絕對路徑 -->

< c: import url = " http://127.0.0.1:8080/hello/hello.jsp " /> <!-- 相對路徑 -->

< c: import url = " hello.jsp " /> <!-- Encode -->

< a href = " <c:url value='hello.jsp'><c:param name='userName' value='cyanbomb' /></c:url> " ></ a > <!-- 傳遞參數到指定的URL -->

< c: import url = " hello.jsp " charEncoding = " gb2312 " >      < c:param name = " userName " value = " cyanbomb " /> </ c: import > <!-- URL重定向 -->

< c:redirect url = " ${myurl} " /> <!-- 構造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 >

解除的疑問，list遍歷問題

像這樣一個list,里面有3條記錄,每條記錄包含兩個對象,我把結果集(lstRooms)request到了頁面,想遍歷顯示RrmRooms里的id,和RrmRoomType里的name. 我用JSTL實現如下:

< table >     

< c:forEach var = " rm " items = " ${lstRooms} " >         

< tr >             

< td > ${rm[ 0 ].id} </ td >             

< td > ${rm[ 1 ].name} </ td >         

< tr >     

</ c:forEach > </ table >

STRUTS2實現如下:

< 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 >