struts2学习笔记一------struts2标签学习
原文链接：http://www.cnblogs.com/focusj/archive/2011/01/04/2057651.html#top
struts2标签
终于把struts2标签看的差不多了，不过还有好多还不是很熟悉，我是结合Max的struts2教程和struts自带的reference文档学习的！笔记中有好多都是从Max的博客中搬来的。不过也没有办法，咱水平还不行，也只能站在人家的肩膀上学习一下了！！
if，elseif， else标签
<%@ page language=
"java"
import
=
"java.util.*"
pageEncoding=
"UTF-8"
%>
<%@ taglib uri=
"/struts-tags"
prefix=
"s"
%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+
"://"
+request.getServerName()+
":"
+request.getServerPort()+path+
"/"
;
%>
<!DOCTYPE HTML PUBLIC
"-//W3C//DTD HTML 4.01 Transitional//EN"
>
<html>
<head>
<base href=
"<%=basePath%>"
>
<title>My JSP
'tags.jsp'
starting page</title>
<meta http-equiv=
"pragma"
content=
"no-cache"
>
<meta http-equiv=
"cache-control"
content=
"no-cache"
>
<meta http-equiv=
"expires"
content=
"0"
>
<meta http-equiv=
"keywords"
content=
"keyword1,keyword2,keyword3"
>
<meta http-equiv=
"description"
content=
"This is my page"
>
</head>
<body>
<!--
小技巧：#parameters.country[
1
]可以这样取值！原来Struts2是将URL传的参数封装 成一个数组的，
也就是说你可以在一个URL传两个同名的参数（即?name=a&name=b）；
-->
<%request.setCharacterEncoding(
"utf-8"
);%>
(request获取方式)country=<%=request.getParameter(
"country"
) %><br>
<s:
if
test=
"#parameters.country[1] == 'www'"
>中国</s:
if
>
<s:elseif test=
"#parameters.country[0] == '美国'"
>美国</s:elseif>
<s:
else
>其他国籍的人</s:
else
>
<br>
<!-- 为某个属性赋值 -->
<s:set name=
"country"
value=
"#parameters.country[1]"
></s:set>
country=<s:property value=
"#country"
/> <br>
<s:
if
test=
"#country == 'www'"
>中国</s:
if
>
<s:elseif test=
"#country == '美国'"
>美国</s:elseif>
<s:
else
>其他国籍的人</s:
else
>
<br>
</body>
</html>
|
这里面有个小常识，就是通过url传递参数的时候：Struts2是将URL传的同名参数封装成一个数组，也就是说我们可以在一个URL传两个同名的参数（即?name=a&name=b）；获取的时候直接#parameters.name[0], parameters.name[1]就可以分别取出两个参数的值。
include标签
被包含页面：
<%@ page language=
"java"
import
=
"java.util.*"
pageEncoding=
"UTF-8"
%>
<%@ taglib uri=
"/struts-tags"
prefix=
"s"
%>
this
is the include page!!!
|
包含页面：
<%@ page language=
"java"
import
=
"java.util.*"
pageEncoding=
"UTF-8"
%>
<%@ taglib uri=
"/struts-tags"
prefix=
"s"
%>
<%
String path = request.getContextPath();
String basePath = request.getScheme() +
"://"
+ request.getServerName() +
":"
+ request.getServerPort()
+ path +
"/"
;
%>
<!DOCTYPE HTML PUBLIC
"-//W3C//DTD HTML 4.01 Transitional//EN"
>
<html>
<head>
<base href=
"<%=basePath%>"
>
<title>My JSP
'includea.jsp'
starting page</title>
<meta http-equiv=
"pragma"
content=
"no-cache"
>
<meta http-equiv=
"cache-control"
content=
"no-cache"
>
<meta http-equiv=
"expires"
content=
"0"
>
<meta http-equiv=
"keywords"
content=
"keyword1,keyword2,keyword3"
>
<meta http-equiv=
"description"
content=
"This is my page"
>
<!--
<link rel=
"stylesheet"
type=
"text/css"
href=
"styles.css"
mce_href=
"styles.css"
>
-->
</head>
<body>
This is my JSP1 page.
<br>
<s:include value=
"include.jsp"
>
<!-- 提交表单时才会获得value的值 -->
<s:param name=
"value1"
>test1</s:param>
<s:param name=
"value2"
value=
"user"
></s:param>
</s:include>
</body>
</html>
|
当然struts的include标签静态动态页面都能包含的！
i18n标签 描述：加载资源包到值堆栈。它可以允许text标志访问任何资源包的信息，而不只当前action相关联的资源包。
<%@ page language=
"java"
import
=
"java.util.*"
pageEncoding=
"UTF-8"
%>
<%@ taglib uri=
"/struts-tags"
prefix=
"s"
%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+
"://"
+request.getServerName()+
":"
+request.getServerPort()+path+
"/"
;
%>
<!DOCTYPE HTML PUBLIC
"-//W3C//DTD HTML 4.01 Transitional//EN"
>
<html>
<head>
<base href=
"<%=basePath%>"
>
<title>My JSP
'tags3.jsp'
starting page</title>
<meta http-equiv=
"pragma"
content=
"no-cache"
>
<meta http-equiv=
"cache-control"
content=
"no-cache"
>
<meta http-equiv=
"expires"
content=
"0"
>
<meta http-equiv=
"keywords"
content=
"keyword1,keyword2,keyword3"
>
<meta http-equiv=
"description"
content=
"This is my page"
>
<!--
<link rel=
"stylesheet"
type=
"text/css"
href=
"styles.css"
mce_href=
"styles.css"
>
-->
</head>
<body>
<!-- <s:text>标签没弄明白 -->
<s:i18n name=
"I18N"
>
The i18n value is <s:text name=
"hi!!"
></s:text>
</s:i18n>
<br>
<s:debug></s:debug>
</body>
</html>
|
iterator标签
<%@ page language=
"java"
import
=
"java.util.*"
pageEncoding=
"UTF-8"
%>
<%@ taglib uri=
"/struts-tags"
prefix=
"s"
%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+
"://"
+request.getServerName()+
":"
+request.getServerPort()+path+
"/"
;
%>
<!DOCTYPE HTML PUBLIC
"-//W3C//DTD HTML 4.01 Transitional//EN"
>
<html>
<head>
<base href=
"<%=basePath%>"
>
<title>My JSP
'tags2.jsp'
starting page</title>
<meta http-equiv=
"pragma"
content=
"no-cache"
>
<meta http-equiv=
"cache-control"
content=
"no-cache"
>
<meta http-equiv=
"expires"
content=
"0"
>
<meta http-equiv=
"keywords"
content=
"keyword1,keyword2,keyword3"
>
<meta http-equiv=
"description"
content=
"This is my page"
>
<!--
<link rel=
"stylesheet"
type=
"text/css"
href=
"styles.css"
mce_href=
"styles.css"
>
-->
</head>
<%
List<String> strs =
new
ArrayList<String>();
strs.add(
"a"
);
strs.add(
"b"
);
strs.add(
"c"
);
strs.add(
"d"
);
strs.add(
"e"
);
request.setAttribute(
"strs"
, strs);
%>
<body>
<s:iterator value=
"#request.strs"
var=
"strs"
>
<s:property value=
"#strs"
/>
</s:iterator>
<s:debug></s:debug>
</body>
</html>
|
这个标签挺容易理解的。
param标签
struts2的<s: param>标签问我觉得比较复杂的。struts2的s:param标签主要有两个属性name与value, 若想在value属性中输入直接量,则可以这样写:<s:param name="some" value="%{'user'}"/>, 也可以这样写:<s:param name="some">user</s:param>。 但如果直接赋值，这个值不是由Action动态生成的，而是自己指定的一个字符串，则只能用后者。
param页面代码：
<%@ page language=
"java"
import
=
"java.util.*"
pageEncoding=
"UTF-8"
%>
<%@ taglib uri=
"/struts-tags"
prefix=
"s"
%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+
"://"
+request.getServerName()+
":"
+request.getServerPort()+path+
"/"
;
%>
<!DOCTYPE HTML PUBLIC
"-//W3C//DTD HTML 4.01 Transitional//EN"
>
<html>
<head>
<base href=
"<%=basePath%>"
>
<title>My JSP
'param.jsp'
starting page</title>
<meta http-equiv=
"pragma"
content=
"no-cache"
>
<meta http-equiv=
"cache-control"
content=
"no-cache"
>
<meta http-equiv=
"expires"
content=
"0"
>
<meta http-equiv=
"keywords"
content=
"keyword1,keyword2,keyword3"
>
<meta http-equiv=
"description"
content=
"This is my page"
>
<!--
<link rel=
"stylesheet"
type=
"text/css"
href=
"styles.css"
mce_href=
"styles.css"
>
-->
</head>
<body>
<!-- struts2的s:param标签主要有两个属性name与value,
若想在value属性中输入直接量,则可以这样写:<s:param name=
"some"
value=
"%{'user'}"
/>,
也可以这样写:<s:param name=
"some"
>user</s:param>。
但如果直接赋值，这个值不是由Action动态生成的，而是自己指定的一个字符串，则只能用后者。 -->
<s:url value=
"paramAction.jsp"
id=
"href"
>
<s:param name=
"value1"
>hello!!</s:param>
<s:param name=
"valu2"
value=
"%{'HELLO!'}"
></s:param>
</s:url>
<s:a href=
"%{href}"
mce_href=
"%{href}"
>paramAction</s:a>
<s:debug></s:debug>
</body>
</html>
|
paramAction页面：
<%@ page language=
"java"
import
=
"java.util.*"
pageEncoding=
"UTF-8"
%>
<%@ taglib uri=
"/struts-tags"
prefix=
"s"
%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+
"://"
+request.getServerName()+
":"
+request.getServerPort()+path+
"/"
;
%>
<!DOCTYPE HTML PUBLIC
"-//W3C//DTD HTML 4.01 Transitional//EN"
>
<html>
<head>
<base href=
"<%=basePath%>"
>
<title>My JSP
'paramAction.jsp'
starting page</title>
<meta http-equiv=
"pragma"
content=
"no-cache"
>
<meta http-equiv=
"cache-control"
content=
"no-cache"
>
<meta http-equiv=
"expires"
content=
"0"
>
<meta http-equiv=
"keywords"
content=
"keyword1,keyword2,keyword3"
>
<meta http-equiv=
"description"
content=
"This is my page"
>
<!--
<link rel=
"stylesheet"
type=
"text/css"
href=
"styles.css"
mce_href=
"styles.css"
>
-->
</head>
<body>
value1的值：<%=request.getParameter(
"value1"
) %><br>
value1的值：<s:property value=
"#parameters.value1"
/><br>
value2的值：<%=request.getParameter(
"value2"
) %><br/><!-- 获取不到值 -->
value2的值：${#param.value2 }<!-- 获取不到值 -->
<s:debug></s:debug>
</body>
</html>
|
经常用到的UI标签
<%@ page contentType=
"text/html; charset=UTF-8"
pageEncoding=
"UTF-8"
%>
<%@ taglib prefix=
"s"
uri=
"/struts-tags"
%>
<%@ taglib prefix=
"s"
uri=
"/struts-tags"
%>
<%@ taglib prefix=
"sx"
uri=
"/struts-dojo-tags"
%>
<html>
<head>
<title>UI Tags Example</title>
<s:head />
<sx:head parseContent=
"true"
/>
</head>
<body>
<s:actionerror/>
<s:actionmessage/>
<s:fielderror />
<s:form action=
"exampleSubmit"
method=
"post"
enctype=
"multipart/form-data"
tooltipConfig=
"#{'jsTooltipEnabled':'true'}"
>
<s:textfield
label=
"Name"
name=
"name"
tooltip=
"Enter your Name here"
/>
<s:date name=
"Select Your Birthday"
/>
<!-- 在struts2.
2.1
中<sx:datetimepicker/>的标签使用有所变化，需要引入struts2-dojo-plugin-
2.2
.
1
.jar
这个包。
-->
<sx:datetimepicker
tooltip=
"Select Your Birthday"
label=
"Birthday"
name=
"birthday"
/>
<s:textarea
tooltip=
"Enter your Biography"
label=
"Biograph"
name=
"bio"
cols=
"20"
rows=
"3"
/>
<s:select
tooltip=
"Choose Your Favourite Color"
label=
"Favorite Color"
list=
"{'Red', 'Blue', 'Green'}"
name=
"favoriteColor"
emptyOption=
"true"
headerKey=
"None"
headerValue=
"None"
/>
<s:select
tooltip=
"Choose Your Favourite Language"
label=
"Favourite Language"
list=
"#{'CN':'中文','EN':'英文','FR':'外文'}"
name=
"favouriteLanguage"
emptyOption=
"true"
headerKey=
"None"
headerValue=
"None"
/>
<s:checkboxlist
tooltip=
"Choose your Friends"
label=
"Friends"
list=
"{'Patrick', 'Jason', 'Jay', 'Toby', 'Rene'}"
name=
"friends"
/>
<s:checkbox
tooltip=
"Confirmed that your are Over 18"
label=
"Age 18+"
name=
"legalAge"
/>
<s:doubleselect
tooltip=
"Choose Your State"
label=
"State"
name=
"region"
list=
"{'North', 'South'}"
value=
"'South'"
doubleValue=
"'Florida'"
doubleList=
"top == 'North' ? {'Oregon', 'Washington'} : {'Texas', 'Florida'}"
doubleName=
"state"
headerKey=
"-1"
headerValue=
"---------- Please Select ----------"
emptyOption=
"true"
/>
<s:file
tooltip=
"Upload Your Picture"
label=
"Picture"
name=
"picture"
/>
<s:optiontransferselect
tooltip=
"Select Your Favourite Cartoon Characters"
label=
"Favourite Cartoons Characters"
name=
"leftSideCartoonCharacters"
leftTitle=
"Left Title"
rightTitle=
"Right Title"
list=
"{'Popeye', 'He-Man', 'Spiderman'}"
multiple=
"true"
headerKey=
"headerKey"
headerValue=
"--- Please Select ---"
emptyOption=
"true"
doubleList=
"{'Superman', 'Mickey Mouse', 'Donald Duck'}"
doubleName=
"rightSideCartoonCharacters"
doubleHeaderKey=
"doubleHeaderKey"
doubleHeaderValue=
"--- Please Select ---"
doubleEmptyOption=
"true"
doubleMultiple=
"true"
/>
<s:textarea
label=
"Your Thougths"
name=
"thoughts"
tooltip=
"Enter your thoughts here"
/>
<s:submit onclick=
"alert('aaaa');"
/>
<s:reset onclick=
"alert('bbbb');"
/>
</s:form>
</body>
</html>
|
这些代码是直接从Max的博文中copy过来的，本来这是一个完整的例子我只是把前台展示代码考过来了。在这里有一个要注意的地方，不过在代码中也有体现，这是struts2比较高级的版本和低版本之间的区别，具体从哪个 版本改的我也不是很清楚。这个不同的用法是关于<s: datetimepicker>的。在使用<s: datetimepicker>时，较高的版本中还必须引入struts2-dojo-plugin-2.2.1.jar，还得指明<%@ taglib prefix="sx" uri="/struts-dojo-tags" %> ，如果做实验不成功的可以考虑下是不是这个问题。
struts-tags就算是复习到这里了，如果要是配合一个具体的项目的话就会更好了，继续努力！！！