strust2 ognl例子

1.定义Action

package com.test.action;

import java.util.LinkedList;

import java.util.List;

import java.util.Map;

import javax.servlet.ServletContext;

import javax.servlet.http.HttpServletRequest;

import org.apache.struts2.interceptor.ServletRequestAware;

import org.apache.struts2.interceptor.SessionAware;

import org.apache.struts2.util.ServletContextAware;

import com.struts2.bean.*;

import com.opensymphony.xwork2.ActionSupport;

public class OgnlAction extends ActionSupport implements ServletRequestAware, SessionAware, ServletContextAware   {

   private static final long serialVersionUID = 1L;

   

   private HttpServletRequest request;

   private Map<String, String> session;

   private ServletContext application;

   private List<Book> books;

           

   public void setServletRequest(HttpServletRequest request) {

       this.request = request;    

   }

   @SuppressWarnings("unchecked")

   public void setSession(Map session) {

       this.session = session;        

   }

   public void setServletContext(ServletContext application) {

       this.application = application;

   }

   

   public List<Book> getBooks() {

       return books;

   }

   @Override

   public String execute() {

       request.setAttribute("userName", "Max From request");

       session.put("userName", "Max From session");

       application.setAttribute("userName", "Max From application");

       

       books = new LinkedList<Book>();

       books.add(new Book("978-0735619678", "Code Complete, Second Edition", 32.99));

       books.add(new Book("978-0596007867", "The Art of Project Management", 35.96));

       books.add(new Book("978-0201633610", "Design Patterns: Elements of Reusable Object-Oriented Software", 43.19));

       books.add(new Book("978-0596527341", "Information Architecture for the World Wide Web: Designing Large-Scale Web Sites", 25.19));

       books.add(new Book("978-0735605350", "Software Estimation: Demystifying the Black Art", 25.19));

       

       return SUCCESS;

   }

}

2.定义struts.xml

<action name="OgnlAction" class="com.test.action.OgnlAction">

   

   <result name="success">/ognl/Ognl.jsp</result>

  </action>

3.定义jsp文件

<h3>访问OGNL上下文和Action上下文</h3>

    <p>parameters: <s:property value="#parameters.userName[0]" /></p>

    <p>request.userName: <s:property value="#request['userName']" /></p>

    <p>session.userName: <s:property value="#session.userName" /></p>

    <p>application.userName: <s:property value="#application.userName" /></p>

    <p>attr.userName: <s:property value="#attr.userName" /></p>

    <hr />

    <h3>用于过滤和投影（projecting)集合</h3>

    <p>Books more than $35</p>

    <ul>

        <s:iterator value="books.{?#this.price > 35}">

            <li><s:property value="title" /> - $<s:property value="price" /></li>

        </s:iterator>

    </ul>

    <p>The price of "Code Complete, Second Edition" is: <s:property value="books.{?#this.title=='Code Complete, Second Edition'}.{price}[0]"/></p>

    <hr />

    <h3>构造Map</h3>

    <s:set name="foobar" value="#{'foo1':'bar1', 'foo2':'bar2'}" />

    <p>The value of key "foo1" is <s:property value="#foobar['foo1']" /></p>

    

    <hr />

    <h3>%的用途</h3>

    <p><s:url value="#foobar['foo1']" /></p>

    <p><s:url value="%{#foobar['foo1']}" /></p>

4.浏览器访问地址:http://localhost:8989/Struts2/OgnlAction.action?userName=leon,最后输出结果:

访问OGNL上下文和Action上下文

 

parameters: leon

request.userName: Max From request

session.userName: Max From session

application.userName: Max From application

attr.userName: Max From request

用于过滤和投影（projecting)集合

 

Books more than $35

The Art of Project Management - $35.96 

Design Patterns: Elements of Reusable Object-Oriented Software - $43.19 

The price of "Code Complete, Second Edition" is: 32.99

构造Map

 

The value of key "foo1" is bar1

%的用途

 

#foobar['foo1']?userName=leon

bar1?userName=leon