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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