struts2day02访问ValueStack中的数据以及访问Context中的对象

最新推荐文章于 2025-08-20 17:55:57 发布

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1.在show.jsp页面

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@taglib uri="/struts-tags" prefix="s"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
	<head>
	</head>

	<body style="font-size: 30px;">
		查看ValueStack信息:
		<br>
		<s:debug></s:debug>
		<h1>
			访问root中的
		</h1>
		<br>
		id属性:
		<s:property value="id" />
		<br>
		time属性:
		<s:property value="time" />
		<br>
		使用date标签设定显示时间的格式
		<br>
		指定时间格式:
		<s:date name="time" format="yyyy-MM-dd hh:mm:ss" />
		<h1>
			访问Context中对象
		</h1>
		访问Session：
		<s:property value="#session.hello" />
		<h1>
			使用OGNL调用方法
		</h1>
		Message的长度:
		<s:property value="message.length()" />
		<br>
		OGNL调用静态的属性:
		<s:property value="@java.lang.Math@PI" />
		<br>
		<!--@:代表@java.lang.Math-->
		<s:property value="@@PI" />
		<br>
		<!-- 自定义静态属性建议不要在Action中进行设置 -->
		获取自定义静态属性:
		<s:property value="@zx.day2.action.ShowAction@show" />
		<s:property value="#show" />
		<br>
		使用OGNL进行运算:
		<s:property value="id+100>250" />
		<br>
		范文List中的数据
		<br>
		list第一个对象的工资:
		<s:property value="emps[0].name" />
		的工资为
		<s:property value="emps[0].salary" />
		<br>
		list的长度:
		<s:property value="emps.size" />
		<br>
		判断集合是否为空:
		<s:property value="emps.isEmpty" />
		<hr>
		<h1>
			set标签
		</h1>
		<!-- request.setAttribuet(key,value); -->
		scope:request:
		<s:set var="uname" value="emps[0].name" scope="request"></s:set>
		<s:property value="#request.uname" />
		<br>
		scope:action
		<s:set var="usalary" value="emps[0]" scope="action"></s:set>
		<s:property value="#usalary.salary" />
		<h2>
			push标签
		</h2>
		<s:push value="emps[0]">
		姓名：<s:property value="name" />
			<br>
		工资:<s:property value="salary" />
		</s:push><br>
		<h2>
		 bean标签
		</h2>
		<s:bean name="zx.day2.pojo.Emp" var="e1">
		  <s:param name="name">zhangsan</s:param>
		  <s:param name="salary">1222.0</s:param>
		  <!--
		   value的值使用单引号表示字符串
		  <s:param name="name" value="'zhangsan'"/>
		  <s:param name="salary" value="133"></s:param>
		   -->
		</s:bean>
		从页面创建的对象中获取数据<br>
		name:<s:property value="#e1.name"/><br>
		salary:<s:property value="#e1.salary"/>
	</body>
</html>

2.在zx.day2.pojo包中创建Emp实体类
package zx.day2.pojo;

public class Emp {
	private int id;
	private String name;
	private double salary;

	public Emp(int id, String name, double salary) {
		this.id = id;
		this.name = name;
		this.salary = salary;
	}

	public Emp() {

	}

	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 double getSalary() {
		return salary;
	}

	public void setSalary(double salary) {
		this.salary = salary;
	}

}

3.actionTest.jsp页面

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@taglib uri="/struts-tags" prefix="s"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
	<head>
	</head>

	<body style="font-size: 30px;">
	   <s:action name="list" namespace="/" executeResult="true" ignoreContextParams="false">   
	   </s:action>
	</body>
</html>

4.在 iterator.jsp页面

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@taglib uri="/struts-tags" prefix="s"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
	<head>
	</head>
	<body style="font-size: 30px;">
		<h1>
			Iterator 迭代标签
		</h1>
		<s:iterator var="e" value="emps" status="s">
			<s:property value="#s.index" />
			<s:property value="#s.count" />
			<s:property value="#e.name" />
			<s:property value="#e.salary" />
			<br>
		</s:iterator>
		<h2>
			if/else/elseif
		</h2>
		<s:if test="emps.size>5">
	 员工个数超过5个
	</s:if>
		<s:else>
	 就几个，牛什么牛！
	</s:else>
		<br>
		员工数组中有没有一个叫tom的
		<br>
		对集合进行过滤:
		<br>
		<s:if test="emps.{?#this.salary>10000}">
	 a123有
	</s:if>
		<s:else>
	 没有Tom
	</s:else>
		<br>
		工资大于800的员工
		<br>
		<s:iterator var="e" value="emps.{?#this.salary>800}">
			<s:property value="#e.salary" />
			<br>
		</s:iterator>
		工资大于800的第一个员工
		<br>
		<s:iterator var="e" value="emps.{^#this.salary>800}">
			<s:property value="#e.salary" />
			<br>
		</s:iterator>
		<br>
		工资大于800的第一个员工
		<br>
		<s:iterator var="e" value="emps.{$#this.salary>800}">
			<s:property value="#e.salary" />
			<br>
		</s:iterator>
		<br>
		<!--  Include:<br>
		<s:include value="opt.jsp"></s:include>
		<br>
		URL:<a href="<s:url value="/login.action"/>">登陆</a>
		-->
	</body>
</html>

5.在ShowAction中

package zx.day2.action;

import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import zx.day2.pojo.Emp;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

public class ShowAction extends ActionSupport {
	/**
	 * 
	 */

	private int id;
	private Date time;
	private String message;
	private static String show = "haoren";
	private List<Emp> emps;

	public String execute() {
		id = 100;
		time = new Date();
		message = "1234567";
		// 创建了一个Session
		ActionContext.getContext().getSession().put("hello", "hello OGNL");

		emps = new ArrayList<Emp>();
		emps.add(new Emp(1, "haoren", 2500));
		emps.add(new Emp(2, "lily", 1500));
		emps.add(new Emp(3, "jerry", 800));
		emps.add(new Emp(4, "tom", 650));

		return "success";

	}

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public Date getTime() {
		return time;
	}

	public void setTime(Date time) {
		this.time = time;
	}

	public String getMessage() {
		return message;
	}

	public void setMessage(String message) {
		this.message = message;
	}

	public static String getShow() {
		return show;
	}

	public static void setShow(String show) {
		ShowAction.show = show;
	}

	public List<Emp> getEmps() {
		return emps;
	}

	public void setEmps(List<Emp> emps) {
		this.emps = emps;
	}

}

6.在struts.xml文件中

		<action name="show" class="zx.day2.action.ShowAction">
		 <result name="success">/show.jsp</result>
		 </action>
		 
		 <action name="list" class="zx.day2.action.ShowAction">
		 <result name="success">/iterator.jsp</result>
		 </action>