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