struts2学习(8)struts标签1（数据标签、控制标签）
一、struts2标签简介；
struts标签很多，功能强大，这是优点；
但是缺点的话，性能方面可能会，各方面速度啊啥的会降低；有人比较测试，struts性能比jstl低很多；
二、struts2数据标签：
com.cy.model.Student.java:
package com.cy.model;
public class Student {
private int id;
private String name;
private int age;
public Student() {
super();
// TODO Auto-generated constructor stub
}
public Student(int id, String name, int age) {
super();
this.id = id;
this.name = name;
this.age = age;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
dataTag.jsp:
<body>
<h>数据标签</h>
<hr/>
<a href="data/property.jsp" target="_blank">property标签</a><br/>
<a href="data/set.jsp" target="_blank">set标签</a><br/>
<a href="data/bean.jsp" target="_blank">bean标签</a><br/>
<a href="data/date.jsp" target="_blank">date标签</a><br/>
<a href="data/debug.jsp" target="_blank">debug标签</a><br/>
<a href="data/url_a.jsp" target="_blank">url_a标签</a><br/>
<a href="data/include.jsp" target="_blank">include标签</a><br/>
</body>
property.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<%
request.setAttribute("name","<font color=red>张三</font>");
%>
</head>
<body>
<s:property value="#request.name" /><br/>
<s:property value="#request.name2" default="某某人"/><br/>
<s:property value="#request.name" default="某某人" escapeHtml="false"/><br/>
</body>
</html>
set.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<s:set var="i" value="1"></s:set>
<s:property value="#i" /><br/>
<s:set var="a" value="'action范围的值'" scope="action"></s:set>
<s:set var="p" value="'page范围的值'" scope="page"></s:set>
<s:set var="r" value="'request范围的值'" scope="request"></s:set>
<s:set var="s" value="'session范围的值'" scope="session"></s:set>
<s:set var="app" value="'application范围的值'" scope="application"></s:set>
<s:property value="#a" /><br/><!-- action范围相当于值栈里面 -->
<s:property value="#attr.p"/><br/>
<s:property value="#request.r"/><br/>
<s:property value="#session.s"/><br/>
<s:property value="#application.app"/><br/>
</body>
</html>
bean.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<s:bean name="com.cy.model.Student" var="student">
<s:param name="name" value="'张三'"></s:param>
<s:param name="age" value="10"></s:param>
</s:bean>
<s:property value="#student.name"/>
<s:property value="#student.age"/>
</body>
</html>
data.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="java.util.*" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<%
request.setAttribute("date",new Date());
%>
</head>
<body>
${date }<br/>
<!-- 这种格式化时间的jstl也是有的 -->
当前日期：<s:date name="#request.date" format="yyyy-MM-dd"/><br>
当前日期：<s:date name="#request.date" format="yyyy/MM/dd"/>
</body>
</html>
debug.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<!-- 相当于值栈debug 可以看到valueStack中的值
可以看到attr，request，session，application等...中的值
-->
<s:debug></s:debug>
</body>
</html>
url_a.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<!-- s:url相当于定义一个url变量 -->
<s:url action="hello" namespace="/foreground" id="h">
<s:param name="name" value="'struts2'"></s:param>
</s:url>
<s:a href="%{h}">超链接</s:a> <!-- 相当于上面的写法 -->
<s:a action="hello" namespace="/foreground">
<s:param name="name" value="'struts2'"></s:param>
超链接2
</s:a>
</body>
</html>
include.jsp:和head.html:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<!-- 相当于jsp:include -->
<s:include value="head.html"></s:include>
</body>
</html>
<body>
头部
</body>
测试结果：
property标签结果：
set标签结果：
bean标签结果：
date标签结果：
debug标签结果：
url_a标签结果：
include标签结果：
三、struts2控制标签：
merge标签和append标签是有区别的;
可以看结果显示出来的区别；
append是将list1和list2合并到一起；
merge是组合，有点像取list1中的一个元素，再取list2中的一个元素，....最后将这两个list中的元素合并到一个list里面；
subset：count="2" start="2" 索引从2开始，取两条数据；
com.cy.comparator.MyComparator.java:
package com.cy.comparator;
import java.util.Comparator;
import com.cy.model.Student;
public class MyComparator implements Comparator<Student>{
public int compare(Student s1, Student s2) {
if(s1.getAge()>s2.getAge()){
return 1;
}else if(s1.getAge()<s2.getAge()){
return -1;
}
return 0;
}
}
controlTag.jsp：
<body>
<h>控制标签</h>
<hr/>
<a href="control/ifelse.jsp" target="_blank">ifelse标签</a><br/>
<a href="control/iterator.jsp" target="_blank">iterator标签</a><br/>
<a href="control/append.jsp" target="_blank">append标签</a><br/>
<a href="control/generator.jsp" target="_blank">generator标签</a><br/>
<a href="control/merge.jsp" target="_blank">merge标签</a><br/>
<a href="control/sort.jsp" target="_blank">sort标签</a><br/>
<a href="control/subset.jsp" target="_blank">subset标签</a><br/>
</body>
ifelse.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<%
int age=11;
request.setAttribute("age",age);
%>
</head>
<body>
<s:if test="#request.age<20">
年龄小于20岁
</s:if>
<s:elseif test="#request.age==20">
年龄等于20岁
</s:elseif>
<s:else>
年龄大于20岁
</s:else>
</body>
</html>
iterator.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="com.cy.model.Student" %>
<%@ page import="java.util.*" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<%
List<Student> studentList=new ArrayList<Student>();
studentList.add(new Student(1,"张三",10));
studentList.add(new Student(3,"李四",20));
studentList.add(new Student(5,"王五",30));
request.setAttribute("studentList",studentList);
%>
</head>
<body>
<table>
<tr>
<th>序号</th>
<th>编号</th>
<th>姓名</th>
<th>年龄</th>
</tr>
<s:iterator value="#request.studentList" status="status">
<tr>
<td><s:property value="#status.index+1"/></td>
<td><s:property value="id"/></td>
<td><s:property value="name"/></td>
<td><s:property value="age"/></td>
</tr>
</s:iterator>
</table>
</body>
</html>
append.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="com.cy.model.Student" %>
<%@ page import="java.util.*" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<%
List<Student> studentList1=new ArrayList<Student>();
List<Student> studentList2=new ArrayList<Student>();
studentList1.add(new Student(1,"张三",10));
studentList1.add(new Student(3,"李四",20));
studentList2.add(new Student(5,"王五",30));
studentList2.add(new Student(7,"赵六",40));
request.setAttribute("studentList1",studentList1);
request.setAttribute("studentList2",studentList2);
%>
</head>
<body>
<s:append var="studentList3">
<s:param value="#request.studentList1"></s:param>
<s:param value="#request.studentList2"></s:param>
</s:append>
<table>
<tr>
<th>序号</th>
<th>编号</th>
<th>姓名</th>
<th>年龄</th>
</tr>
<s:iterator value="studentList3" status="status">
<tr>
<td><s:property value="#status.index+1"/></td>
<td><s:property value="id"/></td>
<td><s:property value="name"/></td>
<td><s:property value="age"/></td>
</tr>
</s:iterator>
</table>
</body>
</html>
generator.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<s:generator separator="," val="'张三,李四,王五'" var="nameList"></s:generator> <s:iterator value="#nameList">
<s:property/>
</s:iterator>
</body>
</html>
merge.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="com.cy.model.Student" %>
<%@ page import="java.util.*" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<%
List<Student> studentList1=new ArrayList<Student>();
List<Student> studentList2=new ArrayList<Student>();
studentList1.add(new Student(1,"张三",10));
studentList1.add(new Student(3,"李四",20));
studentList2.add(new Student(5,"王五",30));
studentList2.add(new Student(7,"赵六",40));
request.setAttribute("studentList1",studentList1);
request.setAttribute("studentList2",studentList2);
%>
</head>
<body>
<s:merge var="studentList3">
<s:param value="#request.studentList1"></s:param>
<s:param value="#request.studentList2"></s:param>
</s:merge>
<table>
<tr>
<th>序号</th>
<th>编号</th>
<th>姓名</th>
<th>年龄</th>
</tr>
<s:iterator value="studentList3" status="status">
<tr>
<td><s:property value="#status.index+1"/></td>
<td><s:property value="id"/></td>
<td><s:property value="name"/></td>
<td><s:property value="age"/></td>
</tr>
</s:iterator>
</table>
</body>
</html>
sort.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="com.cy.model.Student" %>
<%@ page import="java.util.*" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<%
List<Student> studentList1=new ArrayList<Student>();
studentList1.add(new Student(1,"张三",20));
studentList1.add(new Student(3,"李四",10));
studentList1.add(new Student(5,"王五",40));
studentList1.add(new Student(7,"赵六",30));
request.setAttribute("studentList1",studentList1);
%>
</head>
<body>
<s:bean id="myComparator" name="com.cy.comparator.MyComparator"></s:bean> <table>
<tr>
<th>序号</th>
<th>编号</th>
<th>姓名</th>
<th>年龄</th>
</tr>
<s:sort comparator="#myComparator" source="#request.studentList1" >
<s:iterator status="status">
<tr>
<td><s:property value="#status.index+1"/></td>
<td><s:property value="id"/></td>
<td><s:property value="name"/></td>
<td><s:property value="age"/></td>
</tr>
</s:iterator>
</s:sort>
</table>
</body>
</html>
subset.jsp:
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@ page import="com.cy.model.Student" %>
<%@ page import="java.util.*" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<%@taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<%
List<Student> studentList1=new ArrayList<Student>();
studentList1.add(new Student(1,"张三",20));
studentList1.add(new Student(3,"李四",10));
studentList1.add(new Student(5,"王五",40));
studentList1.add(new Student(7,"赵六",30));
request.setAttribute("studentList1",studentList1);
%>
</head>
<body> <table>
<tr>
<th>序号</th>
<th>编号</th>
<th>姓名</th>
<th>年龄</th>
</tr>
<s:subset source="#request.studentList1" count="2" start="2">
<s:iterator status="status">
<tr>
<td><s:property value="#status.index+1"/></td>
<td><s:property value="id"/></td>
<td><s:property value="name"/></td>
<td><s:property value="age"/></td>
</tr>
</s:iterator>
</s:subset>
</table>
</body>
</html>
--------------
struts2学习(8)struts标签1（数据标签、控制标签）的更多相关文章
- struts2官方 中文教程 系列十二：控制标签
介绍 struts2有一些控制语句的标签,本教程中我们将讨论如何使用 if 和iterator 标签.更多的控制标签可以参见 tags reference. 到此我们新建一个struts2 web 项 ...
- struts2：标签库图示，控制标签
目录 一.struts2标签库图示二.控制标签1. 条件判断标签(if/elseif/else)2. 迭代标签(iterator) 2.1 遍历List 2.2 遍历Map 2.3 遍历List(Ac ...
- struts2学习笔记--struts.xml配置文件详解
这一节主要讲解struts2里面的struts.xml的常用标签及作用: 解决乱码问题 <constant name="struts.i18n.encoding" value ...
- Struts2学习笔记--Struts例子及开发流程
参考资料:http://blog.csdn.net/hntyzgn2010/article/details/5547753 http://chenlh.iteye.com/blog/464341 入门 ...
- Struts2学习：struts.xml引入自定义的xml文件
随着项目代码的增多,用一个struts.xml来管理所有功能模块的Action未免显得臃肿且结构不清晰,因此可以根据实际的功能划分,将各模块的Action放在自定义的xml文件中,再引入struts. ...
- Struts2基础-4-2 -struts拦截器实现权限控制案例+ 模型驱动处理请求参数 + Action方法动态调用
1.新建项目,添加jar包到WEB-INF目录下的lib文件夹,并添加到builde path里面 整体目录结构如下 2.新建web.xml,添加struts2核心过滤器,和默认首页 <?xml ...
- struts2学习(9)struts标签2（界面标签、其他标签）
四.struts2界面标签: 五.其他标签: 1.界面标签: uiTag.jsp: <body> <h>界面标签</h> <hr/> <a hre ...
- struts2学习笔记--使用Validator校验数据
我们在进行一些操作是需要对用户的输入数据进行验证,比如网站的注册,需要对各个数据项进行数据校验,Struts2提供了一些默认的校验器,比如数字的检测,邮箱的检测,字符串长度的检测等等. 常用的Vali ...
- struts2学习笔记（4）——数据类型转换
回过头来看昨天的那个例子. 在昨天的例子中,只转换了一个Point类,如果想转换多个Point类怎么办呢?在昨天的例子上面做一个小的修改. 首先在input.jsp页面中修改几个输入框. <s: ...
随机推荐
- SpringAnnotation注解之@Resource
@Resource:同样也是注入,默认是按byName,byName找不到的话按byType 1 2 3 4 @Resource public void setUserDao(UserDao user ...
- 【这些年】Linux C/C++软件开发用过的工具
这些年一直从事Linux下C/C++软件开发,学习工作中用到了不少开发工具,一直想做个总结,却总是因为这个原因那个原因,未能动笔.趁今天天气凉爽,空气清新,花点儿功夫,做一个小结啦,防止以 ...
- 【python】matplotlib进阶
参考文章:https://liam0205.me/2014/09/11/matplotlib-tutorial-zh-cn/ 几个重要对象:图像.子图.坐标轴.记号 figure:图像, subplo ...
- PHP错误Parse error: syntax error, unexpected end of file in test.php on line 12解决方法
出现这个错误的原因就是语法错误,肯定是PHP程序的书写不规范造成,PHP语句标识符错了,没有在php.ini中开启短标签!八成是这个原因,啊啊啊! 今天在写PHP程序的时候总是出现这样的错误:Pars ...
- 《Drools7.0.0.Final规则引擎教程》第4章 注释&错误信息
注释 像Java开发语言一样,Drools文件中也可以添加注释.注释部分Drools引擎是会将其忽略调的.单行注释使用"//",示例如下: rule "Testing C ...
- 如何预编译ASP.Net程序
打开Developer Command Prompt,执行命令 aspnet_compiler -v \Target -p 源文件夹地址 -f 目标文件夹地址
- learn Linux sed command
learn Linux sed command 一.参考文档: . sed命令详解 http://qifuguang.me/2015/09/21/sed%E5%91%BD%E4%BB%A4%E8%AF ...
- 【剑指offer】二叉搜索树转双向链表，C++实现
原创博文,转载请注明出处! # 题目 输入一棵二叉搜索树,将该二叉搜索树转换成一个排序的双向链表.要求不能创建任何新的结点,只能调整树中结点指针的指向. 二叉树节点的定义 struct TreeNod ...
- win8 ie10 debug flex
win8 ie10 使用flash debug方法: 删除c:\WINDOWS\system32\Macromed\Flash.c:\WINDOWS\SysWOW64\Macromed\Flash里面 ...
- with异常
with 语句 语法: with 表达式1 [as 变量1], 表达式2 [as 变量2], ...: 语句块 作用: 使用于对资源进行访问的场合,确保使用过程中不管是否发生异常都会执行必要的'清理操 ...