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>
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