Struts2 OGNL表达式

1、index.jsp

<struts>
 <constant name="struts.enable.DynamicMethodInvocation" value="true">
 <constant name="struts.devMode" value="true">
 <constant name="struts.ognl.allowStaticMethodAccess" value="true"></constant>
 <include file="/com/wxh/action/ognl.xml">
</include></constant></constant></struts>

<struts>
<constant name="struts.enable.DynamicMethodInvocation" value="true">
 <constant name="struts.devMode" value="true">
	<package extends="struts-default" name="ognl">
		<action class="com.wxh.action.OgnlAction" name="ognl">
			<result>/ognl.jsp</result>
		</action>
		<action class="com.wxh.action.TestAction" name="test">
			<result type="chain">ognl</result>
		</action>
	</package>
</constant></constant></struts>

1. 访问值栈中的action的普通属性:username=
2. 访问值栈中的对象的普通属性(get set 方法):|
3. 访问值栈中的对象的普通属性（get set 方法）:
4. 访问值栈中的对象的普通方法：
5. 访问值栈中的对象的普通方法：
6. 访问值栈中action的普通方法：
7. 访问静态方法：
8. 访问静态属性：
9. 访问Math类的静态方法：
10. 访问普通类的构造方法:
11. 访问List:
12.  
13. 访问List中某个元素:
14.  
15. 访问List中元素某个属性的集合:
16.  
17. 访问List中元素某个属性的集合中的特定值:|
18.  
19. 访问Set:
20. 访问Set中的某个元素:
21. 访问Map:
22. 访问Map中某个元素：||
23. 访问Map中所有的key：
24. 访问Map中所有的value：
25. 访问容器的大小：|
26. 投影（过滤）:
27. 投影:
28. 投影:
29. 投影:
30. []:

package com.wxh.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 com.opensymphony.xwork2.ActionSupport;

public class OgnlAction extends ActionSupport{
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;
	private String password;
	private String username;
	private User user;
	private Cat cat;
	
	private List users=new ArrayList();
	private Set dogs=new HashSet();
	private Map dogMap=new HashMap();
	
	public OgnlAction(){
		users.add(new User(1));
		users.add(new User(2));
		users.add(new User(3));
		
		dogs.add(new Dog("dog1"));
		dogs.add(new Dog("dog2"));
		dogs.add(new Dog("dog3"));
		
		dogMap.put("dog100",new Dog("dog100"));
		dogMap.put("dog101",new Dog("dog101"));
		dogMap.put("dog102",new Dog("dog102"));
	}
	
	
	
	public List getUsers() {
		return users;
	}



	public void setUsers(List users) {
		this.users = users;
	}



	public Set getDogs() {
		return dogs;
	}



	public void setDogs(Set dogs) {
		this.dogs = dogs;
	}



	public Map getDogMap() {
		return dogMap;
	}



	public void setDogMap(Map dogMap) {
		this.dogMap = dogMap;
	}



	public String m(){
		return "hello";
	}
	
	public Cat getCat() {
		return cat;
	}

	public void setCat(Cat cat) {
		this.cat = cat;
	}

	public User getUser() {
		return user;
	}

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

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}

	public String getUsername() {
		return username;
	}

	public void setUsername(String username) {
		this.username = username;
	}
	public String execute(){
		return SUCCESS;
	}
	
}

package com.wxh.action;

public class Cat {
	private Dog friend;

	public Dog getFriend() {
		return friend;
	}

	public void setFriend(Dog friend) {
		this.friend = friend;
	}
	public String miaomiao(){
		return "miaomiao";
	}

}

package com.wxh.action;

public class Dog {
	public Dog(){
		
	}
	public Dog(String anme){
		super();
		this.name=name;
	}
	private String name;

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}
	public String toString(){
		return "dog:"+name;
	}

}

package com.wxh.action;

public class S {
	public static String STR="STATIC STRING";
	
	public static String s(){
		return "static method";
	}
}

package com.wxh.action;

public class User {	
	private int age;
	
	public User(){
		System.out.println("user.constructor!");
	}
	public User(int age){
		super();
		this.age=age;
	}
	
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String toString(){
		return "user"+age;
	}

}