Struts中logic部分标签实例

本文主要内容是参考:http://x.discuz.net/131976/viewspace-90916.html

<%@ page language = "java" pageEncoding = "utf-8" %>
<%@ taglib uri = "http://jakarta.apache.org/struts/tags-bean"
prefix = "bean" %>
<%@ taglib uri = "http://jakarta.apache.org/struts/tags-html"
prefix = "html" %>
<%@ taglib uri = "http://jakarta.apache.org/struts/tags-logic"
prefix = "logic" %>
<%@ taglib uri = "http://jakarta.apache.org/struts/tags-tiles"
prefix = "tiles" %>
<%@ taglib uri = "http://jakarta.apache.org/struts/tags-template"
prefix = "template" %>
<%@ taglib uri = "http://jakarta.apache.org/struts/tags-nested"
prefix = "nested" %>
<! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" >
< html:html locale = "true" >
< head >
< html:base />
< title > a.jsp </ title >
<!-- -->
</ head >
< body >
This a struts page.
< br >
<%
String[] testArray = { "str0" , "str1" , "str2" , "str3" , "str4" ,
"str5" };
pageContext.setAttribute( "test" , testArray);
%>
< logic:iterate id = "array" name = "test" >
< bean:write name = "array" />
</ logic:iterate >
<!--logic:iterate 中的 id="suibiana" bean:write 中的 name="suibiana" 对应,名字随便起。
logic:iterate 中的 name="test" pageContext.setAttribute("test",testArray)
"test" 对应。
logic:iterate :
length="1" 表示输出几个数据;
offset="0" 表示从第几个开始输出。
-->
< h1 >
更高级的
</ h1 >
< logic:iterate id = "suibiana" name = "test" length = "1" offset = "0" >
< bean:write name = "suibiana" />
< br >
</ logic:iterate >
< br >
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
< br >
< h1 >
logic:equal
</ h1 >
<%
pageContext.setAttribute( "equal" , new Integer(1000));
%>
<!-- logic:equal 中的 name="equal" pageContext.setAttribute("equal",new Integer(1000))
"equal" 对应。
logic:equal 中的 value="1000" pageContext.setAttribute("equal",new Integer(1000))
Integer(1000) 做比较。
如果两个值相等则执行
<logic:equal value="1000" name="equal">
test=1001
</logic:equal>
logic 标签中间的程序,此程序为在页面显示 test=1001 。否则不执行这之间的程序。
-->
< logic:equal value = "1000" name = "equal" >
test=1001
</ logic:equal >
< h1 >
logic:greaterThan
</ h1 >
<!-- 比较两个值不等;但此方法不稳定 value="10101" 时也无输出, value="10" 时有输出。
Warning :测试后结果极难理解,尽量避免此方法的应用!
-->
< logic:greaterThan value = "10" name = "equal" >
true
</ logic:greaterThan >
< br >
< h1 >
logic:match
</ h1 >
<%
pageContext.setAttribute( "match" , "helloWord" );
%>
<!-- 如果 logic:match 中的 value="hello" 的值能在 pageContext.setAttribute("match","helloWord")
"helloWord" 里找到,则执行 logic:match 标签之间的
<logic:match value="hello" name="match">
hello helloWord
</logic:match>
中的内容,本程序在页面输出 “hello helloWord
如果找不到,则不执行以上程序。
-->
< logic:match value = "hello" name = "match" >
hello helloWord
</ logic:match >
< br >
< h1 > match:match location="start" </ h1 >
<!--location="start" 比较是否以特定字段开始 -->
< logic:match value = "hello" name = "match" location = "start" >
helloWord hello 开头
</ logic:match >
< br >
< h1 > logic:match location="end" </ h1 >
<!--location="end" 比较是否以特定字段结尾 -->
< logic:match value = "d" name = "match" location = "end" >
helloWord d 结尾
</ logic:match >
</ body >
</ html:html >

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