//OGNLAction
package com.test.web.action;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;

import ognl.Ognl;
import ognl.OgnlParser;

import org.struts2.action.utils.BaseAction;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.util.CompoundRoot;
import com.opensymphony.xwork2.util.ValueStack;
import com.test.web.bean.User;

public class OGNLAction extends BaseAction {
    private static final long    serialVersionUID    = -83430767514766103L;
    private String                name                = "zhangsan";
    public static Integer        money                = 1000;
    private User                user;
    private User[] userArray = new User[5];
    private List<User> userList = new ArrayList<>();
    private Set<User> userSet = new HashSet<>();
    private Map<String, User> userMap = new HashMap<>();
    
    public User[] getUserArray() {
        return userArray;
    }

    public void setUserArray(User[] userArray) {
        this.userArray = userArray;
    }

    public List<User> getUserList() {
        return userList;
    }

    public void setUserList(List<User> userList) {
        this.userList = userList;
    }

    public Set<User> getUserSet() {
        return userSet;
    }

    public void setUserSet(Set<User> userSet) {
        this.userSet = userSet;
    }

    public Map<String, User> getUserMap() {
        return userMap;
    }

    public void setUserMap(Map<String, User> userMap) {
        this.userMap = userMap;
    }

    public User getUser() {
        return user;
    }

    public void setUser(User user) {
        this.user = user;
    }

    public String getName() {
        return name;
    }

    public String getHello() {
        return "hello";
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override
    public String execute() throws Exception {
        Map<String, Object> contextMap = ActionContext.getContext()
                .getContextMap();
        ValueStack valueStack = ActionContext.getContext().getValueStack();

        System.out.println(valueStack);
        Map<String, Object> context = valueStack.getContext();

        CompoundRoot root = valueStack.getRoot();
        System.out.println(root);

        System.out.println(contextMap.getClass());
        System.out.println(context.getClass());

        user = new User();
        user.setId(1);
        user.setName("zhangsan");
        
        for (int i = 0; i < 5; i++) {
            User u = new User();
            u.setId(i + 1);
            u.setName("name" + (i + 1));
            
            userArray[i] = u;
            userList.add(u);
            userSet.add(u);
            userMap.put("name" + (i + 1), u);
        }
        
        putToActionContext("myName", "叶良成");
        
        putToRequest("myName", "赵日天");
        
        putToSession("myName", "陈二狗");
        
        putToApplication("myName", "张全蛋");
        
        putToActionContext("my.name", "王尼玛");
        
        return SUCCESS;
    }

    public String hello() {
        System.out.println("hello world");
        return "hello world";
    }

    public static Integer myMoney() {
        return 10000;
    }
}



//Userbean代码
package com.test.web.bean;

public class User {
    private Integer id;
    private String name;
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    
    public String sayHello(){
        System.out.println("hello");
        return "hello";
    }
}
 
//jsp页面代码
 1 <%@ page pageEncoding="UTF-8"%>
  2 <%@ taglib uri="/struts-tags" prefix="s" %>
  3 <%
  4     pageContext.setAttribute("myName", "赵文武");
  5  %>
  6 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
  7 <html>
  8   <head>
  9     <title>struts2</title>
 10   </head>
 11   <body>
 12       <ul>
 13           <li style="color:red;font-weight: bold">&nbsp;Liognl 中的算术运算符</li>
 14           <li>
 15               <label>加法：1 + 1 =</label>
 16               <s:property value="1 + 1" />
 17           </li>
 18           <li>
 19               <label>减法：1 - 1 =</label>
 20               <s:property value="1 - 1" />
 21           </li>
 22           <li>
 23               <label>乘法：5 * 3 =</label>
 24               <s:property value="5 * 3" />
 25           </li>
 26           <li>
 27               <label>除法：4 / 2 =</label>
 28               <s:property value="4 / 2" />
 29           </li>
 30           <li>
 31               <label>求余：4 % 2 =</label>
 32               <s:property value="4 % 2" />
 33           </li>
 34           <li style="color:red;font-weight: bold">ognl 中的比较运算符</li>
 35           <li>
 36               <label>大于：4 > 2 =</label>
 37               <s:property value="4 > 2" />
 38           </li>
 39           <li>
 40               <label>小于：4 < 2 =</label>
 41               <s:property value="4 > 2" />
 42           </li>
 43           <li>
 44               <label>等于：4 == 2 =</label>
 45               <s:property value="4 == 2" />
 46           </li>
 47           <li>
 48               <label>大于等于：4 >= 2 =</label>
 49               <s:property value="4 >= 2" />
 50           </li>
 51           <li>
 52               <label>小于等于：4 <= 2 =</label>
 53               <s:property value="4 <= 2" />
 54           </li>
 55           <li>
 56               <label>不等于：4 != 2 =</label>
 57               <s:property value="4 != 2" />
 58           </li>
 59           <li style="color:red;font-weight: bold">ognl 中的逻辑运算符</li>
 60           <li>
 61               <label>逻辑与：true && false =</label>
 62               <s:property value="true && false" />
 63               <br />
 64               <label>逻辑与：true and false =</label>
 65               <s:property value="true and false" />
 66           </li>
 67           <li>
 68               <label>逻辑或：true || false =</label>
 69               <s:property value="true || false" />
 70               <br />
 71               <label>逻辑或：true or false =</label>
 72               <s:property value="true or false" />
 73           </li>
 74           <li>
 75               <label>逻辑非：!true =</label>
 76               <s:property value="!true" />
 77               <br />
 78               <label>逻辑非：not true =</label>
 79               <s:property value="not true" />
 80           </li>
 81           <li style="color:red;font-weight: bold">ognl 中的三元运算符</li>
 82           <li>
 83               <label>条件运算符：1 > 0 ? 1 : 0 =</label>
 84               <s:property value="1 > 0 ? 1 : 0" />
 85           </li>
 86           <li style="color:red;font-weight: bold">ognl 调用action中属性（value stack中的属性）</li>
 87           <li>
 88               <label>action中的name属性=</label>
 89               <s:property value="name" />
 90               <br />
 91               <label>action中的user属性=</label>
 92               <s:property value="user" />
 93               <br />
 94               <label>action中的user的name属性(使用.操作符)=</label>
 95               <s:property value="user.name" />
 96               <br />
 97               <label>action中的user的name属性(使用[]操作符)=</label>
 98               <s:property value="user['name']" />
 99           </li>
100           <li style="color:red;font-weight: bold">ognl 调用action中成员方法</li>
101           <li>
102               <label>action中的hello方法=</label>
103               <s:property value="hello()" />
104           </li>
105           <li style="color:red;font-weight: bold">ognl 调用javabean中成员方法</li>
106           <li>
107               <label>action中user的sayHello()方法=</label>
108               <s:property value="user.sayHello()" />
109           </li>
110           <li style="color:red;font-weight: bold">ognl 调用action中的静态成员</li>
111           <li>
112               <label>action中静态属性money =</label>
113               <s:property value="@com.test.web.action.OGNLAction@money" />
114               <br />
115               <label>action中静态方法myMoney() =</label>
116               <s:property value="@com.test.web.action.OGNLAction@myMoney()" />
117           </li>
118           <li style="color:red;font-weight: bold">ognl 调用JDK中自带类型的静态成员</li>
119           <li>
120               <label>Math中的PI =</label>
121               <s:property value="@java.lang.Math@PI" />
122               <br />
123               <label>Math中的random() =</label>
124               <s:property value="@java.lang.Math@random()" />
125           </li>
126           <li style="color:red;font-weight: bold">ognl 操作集合数组</li>
127           <li style="color:red;font-weight: bold">数组</li>
128           <li>
129               <label>访问数组userArray</label>
130               <s:property value="userArray" />
131               <br />
132               <label>访问数组userArray的长度</label>
133               <s:property value="userArray.length" />
134               <br />
135               <label>访问数组userArray的指定的下标的元素</label>
136               <s:property value="userArray[0]" />
137               <s:property value="userArray[0].name" />
138               <s:property value="userArray[0]['name']" />
139           </li>
140           <li style="color:red;font-weight: bold">List集合</li>
141           <li>
142               <label>访问集合userList</label>
143               <s:property value="userList" />
144               <br />
145               <label>访问集合userList的长度（一）</label>
146               <s:property value="userList.size" />
147               <br />
148               <label>访问集合userList的长度（二）</label>
149               <s:property value="userList.size()" />
150               <br />
151               <label>访问集合userList的指定下标元素</label>
152               <s:property value="userList[0].name" />
153               <br />
154               <label>访问集合userList的指定下标元素</label>
155               <s:property value="userList.get(0).name" />
156               <br />
157               <label>创建一个List集合</label>
158               <s:property value="{1,2,3,4,5}.get(0)" />
159               <s:property value="{'name1','name2','name3'}.get(0)" />
160           </li>
161           <li style="color:red;font-weight: bold">set集合</li>
162           <li>
163               <label>访问集合userSet</label>
164               <s:property value="userSet" />
165               <br />
166               <label>访问集合userSet的长度</label>
167               <s:property value="userSet.size" />
168               <br />
169               <label>访问集合userSet的长度</label>
170               <s:property value="userSet.size()" />
171               <br />
172           </li>
173           <li style="color:red;font-weight: bold">map集合</li>
174           <li>
175               <label>访问集合userMap</label>
176               <s:property value="userMap" />
177               <br />
178               <label>访问集合userMap的长度</label>
179               <s:property value="userMap.size" />
180               <br />
181               <label>访问集合userMap的长度</label>
182               <s:property value="userMap.size()" />
183               <br />
184               <label>访问集合userMap的指定key的元素</label>
185               <s:property value="userMap.name1.name" />
186               <s:property value="userMap['name1']['name']" />
187               <br />
188               <label>创建一个map集合</label>
189               <s:property value="#{'name1':'zhangsan','name2':'lisi'}.name1" />
190           </li>
191           <li style="color:red;font-weight: bold">集合的投影(过滤)</li>
192           <li>
193               <label>获取集合中指定属性子集</label>
194               <s:property value="userList.{name}.get(0)" />
195               <s:property value="userList.{['name']}[0]" />
196               <br />
197               <label>? 获取集合中所有符合条件元素(#this代表当前便利的元素) == userList.{? #this.id > 2}</label>
198               <s:property value="userList.{? #this.id > 2}" />
199               <br />
200               <label>userList.{? #this.id > 2}[0] ==</label>
201               <s:property value="userList.{? #this.id > 2}[0]" />
202               <br />
203               <label>userList.{? #this.id > 2}.get(0) ==</label>
204               <s:property value="userList.{? #this.id > 2}.get(0)" />
205               <br />
206               <label>userList.{? #this.id > 2}.get(0).name ==</label>
207               <s:property value="userList.{? #this.id > 2}.get(0).name" />
208               <br />
209               <label>userList.{? #this.id > 2}.{name} ==</label>
210               <s:property value="userList.{? #this.id > 2}.{name}" />
211               <br />
212               <br />
213               <br />
214               <label>^ 获取集合中符合条件的第一个元素 == userList.{^ #this.id > 2}</label>
215               <s:property value="userList.{^ #this.id > 2}" />
216               <s:property value="userList.{^ #this.id > 2}[0].name" />
217               <br />
218               <label>$ 获取集合中符合条件的第一个元素 == userList.{$ #this.id > 2}</label>
219               <s:property value="userList.{$ #this.id > 2}" />
220               <s:property value="userList.{$ #this.id > 2}[0].name" />
221           </li>
222           <li style="color:red;font-weight: bold">ognl 访问Stack context中的属性（需在要访问的属性前加#）</li>
223           <li>
224               <label>访问stack context中的myName</label>
225             <!-- ognl访问属性时，属性前不带#会到值栈中查找，如果没有，会到context中继续查找 -->
226               <s:property value="my.name" />
227               <s:property value="#myName" />
228               <br />
229               <label>访问request中的myName</label>
230               <s:property value="#request.myName" />
231               <br />
232               <label>访问session中的myName</label>
233               <s:property value="#session.myName" />
234               <br />
235               <label>访问application中的myName</label>
236               <s:property value="#application.myName" />
237               <br />
238               <label>访问parameters中的请求参数</label>
239               <s:property value="#parameters.myName" />
240               <br />
241               <label>通过attr访问作用域属性 取值顺寻page->request->session->application</label>
242               <s:property value="#attr.myName" />
243               <br />
244           </li>
245           <li style="color:red;font-weight: bold">ognl %{expression}操作符,将{}中的字符串作为ongl表达式计算</li>
246           <li>
247               <s:property value="%{name}" />
248           </li>
249       </ul>
250       <s:debug />
251   </body>
252 </html>