struts2学习struts标签1（数据标签控制标签）

Posted 有点懒惰的大青年

tags:

篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了struts2学习struts标签1（数据标签控制标签）相关的知识，希望对你有一定的参考价值。

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;
    }
}
View Code

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>
View Code

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>
View Code

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>
View Code

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>
View Code

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>
View Code

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>
View Code

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>
View Code

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>
View Code