//前端 <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=GB18030" /> <title>Insert title here</title> </head> <body> 访问属性<br/> <a href="<%=contextPath %>/ognl.action?username=u&password=p">ognl</a> </body> </html>
//web.xml
<struts>
<constant name="struts.enable.DynamicMethodInvocation" value="false" />
<constant name="struts.devMode" value="true" />
<constant name="struts.ognl.allowStaticMethodAccess" value="true"></constant>
<include file="/com/struts2/ognl/ognl.xml"/>
</struts>//ognl.xml
<struts>
<package name="ognl" extends="struts-default">
<action name="ognl" class="com.struts2.ognl.OgnlAction">
<result>/ognl.jsp</result>
</action>
<action name="test" class="com.struts2.ognl.TestAction">
<result type="chain">ognl</result>
</action>
</package>
</struts>//类包
//ognl.java
package com.struts2.ognl;
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 String password;
private String username;
private User user;
private Cat cat;
private List<User> users = new ArrayList<User>();
private Set<Dog> dogs = new HashSet<Dog>();
private Map<String, Dog> dogMap = new HashMap<String, Dog>();
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 String execute() {
return SUCCESS;
}
public String getPassword() {
return password;
}
public String getUsername() {
return username;
}
public User getUser() {
return user;
}
public Cat getCat() {
return cat;
}
public List<User> getUsers() {
return users;
}
public Map<String, Dog> getDogMap() {
return dogMap;
}
public Set<Dog> getDogs() {
return dogs;
}
public String m() {
return "hello";
}
public void setCat(Cat cat) {
this.cat = cat;
}
public void setDogMap(Map<String, Dog> dogMap) {
this.dogMap = dogMap;
}
public void setDogs(Set<Dog> dogs) {
this.dogs = dogs;
}
public void setPassword(String password) {
this.password = password;
}
public void setUser(User user) {
this.user = user;
}
public void setUsername(String username) {
this.username = username;
}
public void setUsers(List<User> users) {
this.users = users;
}
}
//user.java
package com.struts2.ognl;
public class User {
private int age = 8;
public User() {
}
public User(int age) {
super();
this.age = age;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
@Override
public String toString() {
return "user" + age;
}
}//cat.java
package com.struts2.ognl;
public class Cat {
private Dog friend;
public Dog getFriend() {
return friend;
}
public void setFriend(Dog friend) {
this.friend = friend;
}
public String miaomiao() {
return "miaomiao";
}
}
//dog.java
package com.struts2.ognl;
public class Cat {
private Dog friend;
public Dog getFriend() {
return friend;
}
public void setFriend(Dog friend) {
this.friend = friend;
}
public String miaomiao() {
return "miaomiao";
}
}//展示
</head>
<body>
<ol>
<li>访问值栈中的action的普通属性: username = <s:property value="username"/> </li>
<li>访问值栈中对象的普通属性(get set方法)：<s:property value="user.age"/> | <s:property value="user['age']"/> | <s:property value="user[\"age\"]"/> | wrong: <%--<s:property value="user[age]"/>--%></li>
<li>访问值栈中对象的普通属性(get set方法): <s:property value="cat.friend.name"/></li>
<li>访问值栈中对象的普通方法：<s:property value="password.length()"/></li>
<li>访问值栈中对象的普通方法：<s:property value="cat.miaomiao()" /></li>
<li>访问值栈中action的普通方法：<s:property value="m()" /></li>
<hr />
<li>访问静态方法：<s:property value="@com.struts2.ognl.S@s()"/></li>
<li>访问静态属性：<s:property value="@com.struts2.ognl.S@STR"/></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 com.struts2.ognl.User(8)"/></li>
<hr />
<li>访问List:<s:property value="users"/></li>
<li>访问List中某个元素:<s:property value="users[1]"/></li>
<li>访问List中元素某个属性的集合:<s:property value="users.{age}"/></li>
<li>访问List中元素某个属性的集合中的特定值:<s:property value="users.{age}[0]"/> | <s:property value="users[0].age"/></li>
<li>访问Set:<s:property value="dogs"/></li>
<li>访问Set中某个元素:<s:property value="dogs[1]"/></li>
<li>访问Map:<s:property value="dogMap"/></li>
<li>访问Map中某个元素:<s:property value="dogMap.dog101"/> | <s:property value="dogMap['dog101']"/> | <s:property value="dogMap[\"dog101\"]"/></li>
<li>访问Map中所有的key:<s:property value="dogMap.keys"/></li>
<li>访问Map中所有的value:<s:property value="dogMap.values"/></li>
<li>访问容器的大小：<s:property value="dogMap.size()"/> | <s:property value="users.size"/> </li>
<hr />
<li>投影(过滤)：<s:property value="users.{?#this.age==1}[0]"/></li>
<li>投影：<s:property value="users.{^#this.age>1}.{age}"/></li>
<li>投影：<s:property value="users.{$#this.age>1}.{age}"/></li>
<li>投影：<s:property value="users.{$#this.age>1}.{age} == null"/></li>
<hr />
<li>[]:<s:property value="[0].username"/></li>
</ol>
<s:debug></s:debug>
</body>
</html>
->
<struts> <package name="ognl" extends="struts-default"> <action name="ognl" class="com.struts2.ognl.OgnlAction"> <result>/ognl.jsp</result> </action> <action name="test" class="com.struts2.ognl.TestAction"> <result type="chain">ognl</result> </action> </package> </struts>-> 根据xml配置文件里面的action关联的类，构造类对象;
静态方法访问方式@类名@方法名
需要在web.xml中设置<constant name="struts.ognl.allowStaticMethodAccess"http://localhost:8080/Struts2_1900_OGNL/ognl.action?username=u&password=p&user.age = 19&cat.friend.name =oudy
<li>投影(过滤)：<s:property value="users.{?#this.age==1}[0]"/></li>
<li>投影：<s:property value="users.{^#this.age>1}.{age}"/></li>
<li>投影：<s:property value="users.{$#this.age>1}.{age}"/></li>
<li>投影：<s:property value="users.{$#this.age>1}.{age} == null"/></li>以？ ^ $ 开头加上过滤条件，和正则表达式不相同；【web开发学习笔记】Structs2 OGNL学习笔记,布布扣,bubuko.com
原文地址：http://blog.csdn.net/licong_carp/article/details/37317109
