struts2標簽
終于把struts2標簽看的差不多了，不過還有好多還不是很熟悉，我是結合Max的struts2教程和struts自帶的reference文檔學習的！筆記中有好多都是從Max的博客中搬來的。不過也沒有辦法，咱水平還不行，也只能站在人家的肩膀上學習一下了！！
if，elseif， else標簽
<%@ 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]可以這樣取值！原來Struts2是將URL傳的參數封裝 成一個數組的，
也就是說你可以在一個URL傳兩個同名的參數（即?name=a&name=b）；
-->
<%request.setCharacterEncoding("utf-8");%>
(request獲取方式)country=<%=request.getParameter("country") %><br>
<s:if test="#parameters.country[1] == 'www'">中國</s:if>
<s:elseif test="#parameters.country[0] == '美國'">美國</s:elseif>
<s:else >其他國籍的人</s:else>
<br>
<!-- 為某個屬性賦值 -->
<s:set name="country" value="#parameters.country[1]"></s:set>
country=<s:property value="#country" /> <br>
<s:if test="#country == 'www'">中國</s:if>
<s:elseif test="#country == '美國'">美國</s:elseif>
<s:else >其他國籍的人</s:else>
<br>
</body>
</html>
這里面有個小常識，就是通過url傳遞參數的時候：Struts2是將URL傳的同名參數封裝成一個數組，也就是說我們可以在一個URL傳兩個同名的參數（即?name=a&name=b）；獲取的時候直接#parameters.name[0], parameters.name[1]就可以分別取出兩個參數的值。
include標簽
被包含頁面：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
this is the include page!!!
包含頁面：
<%@ 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">
<!-- 提交表單時才會獲得value的值 -->
<s:param name="value1">test1</s:param>
<s:param name="value2" value="user"></s:param>
</s:include>
</body>
</html>
當然struts的include標簽靜態動態頁面都能包含的！
i18n標簽
描述：加載資源包到值堆棧。它可以允許text標志訪問任何資源包的信息，而不只當前action相關聯的資源包。
<%@ 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>標簽沒弄明白 -->
<s:i18n name="I18N">
The i18n value is <s:text name="hi!!"></s:text>
</s:i18n>
<br>
<s:debug></s:debug>
</body>
</html>
iterator標簽
<%@ 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>
這個標簽挺容易理解的。
param標簽
struts2的<s: param>標簽問我覺得比較復雜的。struts2的s:param標簽主要有兩個屬性name與value, 若想在value屬性中輸入直接量,則可以這樣寫:<s:param name="some" value="%{'user'}"/>, 也可以這樣寫:<s:param name="some">user</s:param>。 但如果直接賦值，這個值不是由Action動態生成的，而是自己指定的一個字符串，則只能用后者。
param頁面代碼：
<%@ 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標簽主要有兩個屬性name與value,
若想在value屬性中輸入直接量,則可以這樣寫:<s:param name="some" value="%{'user'}"/>,
也可以這樣寫:<s:param name="some">user</s:param>。
但如果直接賦值，這個值不是由Action動態生成的，而是自己指定的一個字符串，則只能用后者。 -->
<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頁面：
<%@ 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/><!-- 獲取不到值 -->
value2的值：${#param.value2 }<!-- 獲取不到值 -->
<s:debug></s:debug>
</body>
</html>
經常用到的UI標簽
<%@ 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/>的標簽使用有所變化，需要引入struts2-dojo-plugin-2.2.1.jar
這個包。
-->
<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>
這些代碼是直接從Max的博文中copy過來的，本來這是一個完整的例子我只是把前臺展示代碼考過來了。在這里有一個要注意的地方，不過在代碼中也有體現，這是struts2比較高級的版本和低版本之間的區別，具體從哪個 版本改的我也不是很清楚。這個不同的用法是關于<s: datetimepicker>的。在使用<s: datetimepicker>時，較高的版本中還必須引入struts2-dojo-plugin-2.2.1.jar，還得指明<%@ taglib prefix="sx" uri="/struts-dojo-tags" %> ，如果做實驗不成功的可以考慮下是不是這個問題。
struts-tags就算是復習到這里了，如果要是配合一個具體的項目的話就會更好了，繼續努力?。。?/p>