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>

--------------

巴特西

struts2学习(8)struts标签1（数据标签、控制标签）

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