Struts2 OGNL

jsp：

 

<ol>
     <li>访问值栈中的action的普通属性:<s:property value="name" /></li>
     <li>访问值栈中PO.User里的普通属性(get set方法)：<s:property value="user.name" /></li>
     <li>访问值栈中cat里的dog里的属性(get set方法): <s:property value="cat.friend.name" /></li>
     <li>访问值栈中action的普通方法：<s:property value="haha()" /></li>
     <li>访问值栈中字段的普通方法：<s:property value="name.length()" /></li>
     <li>访问值栈中cat里的普通方法：<s:property value="cat.call()" /></li>
     <hr />
     <li>访问静态方法：<s:property value="@JingTai@jingtai()" /></li>
     <li>访问静态属性：<s:property value="@JingTai@ziduan" /></li>
     <li>访问Math类的静态方法：<s:property value="@@max(2,3)" /></li>
     <hr />
     <li>访问普通类的构造方法：<s:property value="new User('jjjj')" /></li>
     <hr />
     <li>访问List:<s:property value="usersList" /></li>
     <li>访问List中某个元素:<s:property value="usersList[0]" /></li>
     <li>访问List中元素某个属性的集合:<s:property value="usersList.{name}" /></li>
     <li>访问List中元素某个属性的集合中的特定值:<s:property value="usersList.{name}[0]" /></li>
     <li>访问Set:<s:property value="usersSet" /></li>
     <li>访问Set中某个元素:<s:property value="usersSet[1]" />没有值是因为set是没有顺序的</li>
     <li>访问Map:<s:property value="usersMap" /></li>
     <li>访问Map中某个元素:<s:property value="usersMap.user1" /></li>
     <li>访问Map中所有的key:<s:property value="usersMap.keys" /></li>
     <li>访问Map中所有的value:<s:property value="usersMap.values" /></li>
     <li>访问list的大小：<s:property value="usersList.size()" /></li>
     <li>访问set的大小：<s:property value="usersSet.size()" /></li>
     <li>访问map的大小：<s:property value="usersMap.size()" /></li>
     <hr />
     <li>投影(过滤)：<s:property value="usersList.{?#this.name=='Lista'}[0]" /></li>
     <hr />
     <li>[]:当debug里有两个action的时候,从action里取值<s:property value="[0].name" /></li>
  </ol>

 

 

action：

 

public class Ognl extends ActionSupport {

 private String name="uuuuuuuuuuuu";
 private User user;
 private Cat cat;
 private List<User> usersList=new ArrayList<User>();
 private Set<User> usersSet=new HashSet<User>();
 private Map<String,User>usersMap=new HashMap<String,User>();
 
 public Ognl(){
  usersList.add(new User("Lista"));
  usersList.add(new User("Listb"));
  usersList.add(new User("Listc"));
  
  usersSet.add(new User("Seta"));
  usersSet.add(new User("Setb"));
  usersSet.add(new User("Setc"));
  
  usersMap.put("user1", new User("Mapa"));
  usersMap.put("user2", new User("Mapb"));
  usersMap.put("user3", new User("Mapc"));
 }
 
 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 execute(){
  return SUCCESS;
 }
 
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 }
 
 public String haha(){
  return "haha";
 }

 public List<User> getUsersList() {
  return usersList;
 }

 public void setUsersList(List<User> usersList) {
  this.usersList = usersList;
 }

 public Set<User> getUsersSet() {
  return usersSet;
 }

 public void setUsersSet(Set<User> usersSet) {
  this.usersSet = usersSet;
 }

 public Map<String, User> getUsersMap() {
  return usersMap;
 }

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

}

 

关联的PO：

 

public class User {

 private String name;
 private String pass;
 
 public User(){
  
 }
 
 public User (String name){
  super();
  this.name=name;
 }
 
 public String getName() {
  return name;
 }
 public void setName(String name) {
  this.name = name;
 }
 public String getPass() {
  return pass;
 }
 public void setPass(String pass) {
  this.pass = pass;
 }
 
 @Override
 public String toString() {
  // TODO Auto-generated method stub
  return "user"+name;
 }
 
}

 

 

 

public class Cat {

 private Dog friend;

 public Dog getFriend() {
  return friend;
 }

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

 

 

public class Dog {

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

 public String getName() {
  return name;
 }

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

 @Override
 public String toString() {
  return "Dog"+name;
 }
}

 

 

public class TwoAction extends ActionSupport{

 @Override
 public String execute() throws Exception {
  return SUCCESS;
 }

 
}

 

 

struts.xml：

 

<action name="ognl" class="Ognl">
            <result>/Ognl.jsp</result>
         </action>
         
<action name="twoAction" class="TwoAction">
            <result type="chain">ognl</result>
</action>

 

如果使用静态方法的话,必须在配置文件里添加

<constant name="struts.ognl.allowStaticMethodAccess" value="true" />