Struts2中使用OGNL表达式投影（过滤）集合
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<welcome-file-list>
<welcome-file>hello.jsp</welcome-file>
</welcome-file-list>
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
</web-app>
struts.xml:
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
"http://struts.apache.org/dtds/struts-2.0.dtd">
<struts>
<!--
<constant name="struts.enable.DynamicMethodInvocation" value="false" />
<constant name="struts.devMode" value="false" />
<include file="example.xml"/>
?
<package name="default" namespace="/" extends="struts-default">
??? <default-action-ref name="index" />
??? <action name="index">
??????? <result type="redirectAction">
??????????? <param name="actionName">HelloWorld</param>
??????????? <param name="namespace">/example</param>
??????? </result>
??? </action>
</package>
-->
<!-- Add packages here -->
<constant name="struts.devMode" value="true" />
<constant name="struts.i18n.encoding" value="GBK" />
<package name="user" namespace="/" extends="struts-default">
??? <action name="user" + this.userName + ", " + this.age + ")";
}
public String hello() {
??? return "Hello World!";
}
public int getAge() {
??? return age;
}
public void setAge(int age) {
??? this.age = age;
}
}
?
index.jsp:
<%@ page language="java" pageEncoding="GB18030"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>ResultParam</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">???
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<a href="user">user</a><br />
</body>
</html>
?
addSuccess.jsp:
<%@ page language="java" pageEncoding="GB18030"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>Dynamic</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">???
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
User Add Success! <br />
投影（过滤）所有符合条件的集合：users.{?#this.age > 19} --> <s:property value="users.{?#this.age > 19}" /><br />
投影（过滤）所有符合条件的集合中指定的元素：users.{?#this.age > 19}[0] --> <s:property value="users.{?#this.age > 19}[0]" /><br />
投影（过滤）第一个符合条件的元素：users.{^#this.age > 19} --> <s:property value="users.{^#this.age > 19}" /><br />
投影（过滤）最后一个符合条件的元素：users.{$#this.age > 19} --> <s:property value="users.{$#this.age > 19}" /><br />
<s:debug></s:debug>
</body>
</html>
