Struts的控制类标签实战

小鱼儿 2021-07-25 00:47 389阅读 0赞

**一 条件类标签**

1 代码

2 测试

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70][]

**二 迭代类标签**

1 s-iterator.jsp

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
    <%@taglib prefix="s" uri="/struts-tags"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>s:itertor标签测试</title>
    </head>
    <body>
    <s:debug/>
    <table border="1" width="300">
    
    <s:iterator value="{'疯狂Java讲义',
        '轻量级Java EE企业应用实战',
        '疯狂iOS讲义'}"
        id="name" status="st">
        <tr <s:if test="#st.odd">
            style="background-color:#bbbbbb"</s:if>>
            <td><s:property value="name"/></td>
        </tr>
    </s:iterator>
    </table>
    <table border="1" width="350">
        <tr>
            <th>书名</th>
            <th>作者</th>
        </tr>
    
    <s:iterator value="#{'疯狂Java讲义':'李刚',
        '轻量级Java EE企业应用实战':'李刚' ,
        '疯狂iOS讲义':'李刚'}"
        id="score" status="st">
        
        <tr <s:if test="#st.odd">
            style="background-color:#bbbbbb"</s:if>>
            
            <td><s:property value="key"/></td>
            
            <td><s:property value="value"/></td>
        </tr>
    </s:iterator>
    </table>
    </body>
    </html>

2 s-iterator-list.jsp

3 测试

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 1][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 2][]

**三 append标签**

1 s-append-map.jsp

<%--
    网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
    author  yeeku.H.lee kongyeeku@163.com
    version  1.0
    Copyright (C), 2001-2016, yeeku.H.Lee
    This program is protected by copyright laws.
    Program Name:
    Date:
    --%>
    
    <%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
    <%@taglib prefix="s" uri="/struts-tags"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>使用s:append标签拼接集合和Map</title>
    </head>
    <body>
    <s:debug/>
    
    <s:append var="newList">
        <s:param value="#{'疯狂Java讲义':'李刚',
            '疯狂iOS讲义':'李刚',
            '经典Java EE企业应用实战':'李刚'}" />
        <s:param value="#{'http://www.crazyit.org',
            'http://www.fkit.org'}" />
    </s:append>
    <table border="1" width="280">
    
    <s:iterator value="#newList" status="st">
        <tr <s:if test="#st.odd">
            style="background-color:#bbbbbb"</s:if>>
            <td><s:property value="key"/></td>
            <td><s:property value="value"/></td>
        </tr>
    </s:iterator>
    </table>
    </body>
    </html>

2 s-append.jsp

<%--
    网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>
    author  yeeku.H.lee kongyeeku@163.com
    version  1.0
    Copyright (C), 2001-2016, yeeku.H.Lee
    This program is protected by copyright laws.
    Program Name:
    Date:
    --%>
    
    <%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
    <%@taglib prefix="s" uri="/struts-tags"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>使用s:append标签拼接两个集合</title>
    </head>
    <body>
    <s:debug/>
    
    <s:append var="newList">
        <s:param value="{'疯狂Java讲义',
            '轻量级Java EE企业应用实战',
            '疯狂iOS讲义'}" />
        <s:param value="{'http://www.crazyit.org',
            'http://www.fkit.org'}" />
    </s:append>
    <table border="1" width="260">
    
    <s:iterator value="#newList" status="st" id="ele">
        <tr>
            <td><s:property value="#st.count"/></td>
            <td><s:property value="ele"/></td>
        </tr>
    </s:iterator>
    </table>
    </body>
    </html>

3 测试

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 3][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 4][]

**四 generator标签**

1 s-generator-simple.jsp

2 s-generator-count.jsp

3 测试

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 5][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 6][]

**五 merge标签**

1 s-merge.jsp

2 s-merge-map.jsp

3 测试

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 7][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 8][]

**六 subset标签**

1 s-subset.jsp

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
    <%@taglib prefix="s" uri="/struts-tags"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>使用s:subset标签截取集合元素</title>
    </head>
    <body>
    <table border="1" width="300">
    
    <s:subset source="{'疯狂Java讲义'
        ,'轻量级Java EE企业应用实战'
        ,'经典Java EE企业应用实战'
        ,'疯狂Ajax讲义'
        ,'疯狂iOS讲义'}"
        start="1" count="4">
        
        <s:iterator status="st">
            
            <tr <s:if test="#st.odd">
                style="background-color:#bbbbbb"</s:if>>
                <td><s:property/></td>
            </tr>
        </s:iterator>
    </s:subset>
    </table>
    </body>
    </html>

2 测试

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 9][]

3 s-subset-decider.jsp

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
    <%@taglib prefix="s" uri="/struts-tags"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>使用s:subset标签截取集合元素</title>
    </head>
    <body>
    
    <s:bean var="mydecider" name="org.crazyit.app.util.MyDecider"/>
    
    <s:subset source="{'疯狂Java讲义'
        ,'轻量级Java EE企业应用实战'
        ,'经典Java EE企业应用实战'
        ,'疯狂Ajax讲义'
        ,'疯狂iOS讲义'}"
        decider="#mydecider"
        var="newList"/>
    直接输出page范围的newList属性：<br/>
    ${pageScope.newList}
    <table border="1" width="240">
    
    <s:iterator status="st" value="#attr.newList">
        <tr <s:if test="#st.odd">
            style="background-color:#bbbbbb"</s:if>>
            <td><s:property/></td>
        </tr>
    </s:iterator>
    </table>
    </body>
    </html>

4 MyDecider

package org.crazyit.app.util;
    
    import org.apache.struts2.util.SubsetIteratorFilter;
    
    
    // 用户自定义的Decider类，实现了SubsetIteratorFilter.Decider接口
    public class MyDecider
        implements SubsetIteratorFilter.Decider
    {
        // 实现Decider接口必须实现的decide()方法，
        // 该方法决定集合中的元素是否被选入子集
        public boolean decide(Object element) throws Exception
        {
            String str = (String)element;
            // 如果集合元素（字符串）中包含Java EE子串，即可被选入子集
            return str.indexOf("Java EE") > 0;
        }
    }

5 测试

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 10][]

**七 sort标签**

1 s-sort.jsp

<%@ page contentType="text/html; charset=GBK" language="java" errorPage="" %>
    <%@taglib prefix="s" uri="/struts-tags"%>
    <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
        "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
    <html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <title>使用s:sort对集合元素进行排序</title>
    </head>
    <body>
    
    <s:bean var="mycomparator" name="org.crazyit.app.util.MyComparator"/>
    
    <s:sort source="{'疯狂Java讲义'
        ,'轻量级Java EE企业应用实战'
        ,'经典Java EE企业应用实战'
        ,'疯狂Ajax讲义'
        ,'疯狂iOS讲义'}"
        comparator="#mycomparator"
        var="sortedList"/>
    输出page范围的sortedList属性：<br/>
    ${pageScope.sortedList}
    <table border="1" width="300">
    
    <s:iterator status="st" value="#attr.sortedList">    
        <tr <s:if test="#st.odd">
            style="background-color:#bbbbbb"</s:if>>
            <td><s:property/></td>
        </tr>
    </s:iterator>
    </table>
    </body>
    </html>

2 MyComparator

package org.crazyit.app.util;
    
    import java.util.Comparator;
    
    
    public class MyComparator implements Comparator
    {
        // 决定两个元素大小的方法
        public int compare(Object element1, Object element2)
        {
            // 根据元素字符串长度来决定大小
            return element1.toString().length()
                - element2.toString().length();
        }
    }

3 测试

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 11][]

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5ncWl1bWluZw_size_16_color_FFFFFF_t_70 2]: /images/20210724/0a37cb9b022e473aa0f689dcb279d6fb.png
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