struts2标签学习

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      if,elseif, else标签

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<%@ 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:iftest="#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:iftest="#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:

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<%@ 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!!!

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