struts.xml简单配置
<!-- （默认false）设置ognl表达式是否支持静态方法 --> <constant name="struts.ognl.allowStaticMethodAccess" value="true"></constant> <package name="ognl" namespace="/ognl" extends="struts-default"> <action name="ognl" class="com.ouc.wkp.action.OgnlAction"> <result>/ognl.jsp</result> </action> </package>
记得打开
<constant name="struts.ognl.allowStaticMethodAccess" value="true"></constant>
package com.ouc.wkp.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 org.apache.commons.chain.Catalog; import com.opensymphony.xwork2.ActionSupport; import com.ouc.wkp.model.Cat; import com.ouc.wkp.model.Dog; import com.ouc.wkp.model.User2; //user.xxx只有传，才会构造，想初始化domain model，可以自己new，也可以传参数值 //但这时候要有参数为空的构造方法 // public class OgnlAction extends ActionSupport { private String password; private String username; private User2 user; private Cat cat; private Map<String, Dog> dogMap = new HashMap<String, Dog>(); private Set<Dog> dogs = new HashSet<Dog>(); private List<User2> users = new ArrayList<User2>(); public Cat getCat() { return cat; } public void setCat(Cat cat) { this.cat = cat; } public User2 getUser() { return user; } public void setUser(User2 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 Map<String, Dog> getDogMap() { return dogMap; } public void setDogMap(Map<String, Dog> dogMap) { this.dogMap = dogMap; } public Set<Dog> getDogs() { return dogs; } public void setDogs(Set<Dog> dogs) { this.dogs = dogs; } public List<User2> getUsers() { return users; } public void setUsers(List<User2> users) { this.users = users; } public OgnlAction() { users.add(new User2(1)); users.add(new User2(2)); users.add(new User2(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")); } @Override public String execute() throws Exception { return SUCCESS; } public String m() { return "mmmmm"; } }
package com.ouc.wkp.model; //user.xxx只有传，才会构造，想初始化domain model，可以自己new，也可以传参数值 //但这时候要有参数为空的构造方法 public class User2 { private int age=8; public int getAge() { return age; } public void setAge(int age) { this.age = age; } public User2(){ // System.out.println("user constructor"); } public User2(int age){ this.age=age; } @Override public String toString() { return "user"+age; } }
package com.ouc.wkp.model; public class Cat { private Dog friend; public Dog getFriend() { return friend; } public void setFriend(Dog friend) { this.friend = friend; } public String miaomiao(){ return "miaomiao"; } // public Cat(){ // // } // // public Cat(Dog friend){ // this.friend=friend; // } // // @Override // public String toString() { // return "cat"+friend; // } }
package com.ouc.wkp.model; public class Dog { private String name; public String getName() { return name; } public void setName(String name) { this.name = name; } public Dog(){ } public Dog(String name){ super(); this.name=name; } @Override public String toString() { return "dog"+name; } }
然后就是比较核心的ognl.jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <%@ taglib uri="/struts-tags" prefix="s"%> <% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'ognl.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <s:debug></s:debug> This is ognl.jsp <br> 访问值栈中的action的普通属性：username= <s:property value="username" /> <br /> 访问值栈中对象的普通属性(get set 方法) <s:property value="user.age" /> <br /> 访问值栈中对象的普通属性(get set 方法) <s:property value="cat.friend.name" /> <br /> 访问值栈中对象的普通方法 <s:property value="password.length()" /> <br /> 访问值栈中对象的普通方法 <s:property value="cat.miaomiao()" /> <br /> 访问静态方法: <s:property value="@com.ouc.wkp.action.S@s()" /> <br /> 访问静态属性: <s:property value="@com.ouc.wkp.action.S@STR" /> <br /> 访问Math类的静态方法: <s:property value="@@max(2,3)" /> <br /> 访问普通类的构造方法: <s:property value="new com.ouc.wkp.model.User2(10)" /> <br /> 访问List: <s:property value="users" /> <br /> 访问List中某个元素: <s:property value="users[1]" /> <br /> 访问List中元素某个属性的集合: <s:property value="users.{age}" /> <br /> 访问List中元素某个属性的集合中的特定值: <s:property value="users.{age}[0]" /> <br /> | <s:property value="users[0].age" /> <br /> 访问Set: <s:property value="dogs" /> <br /> 访问Set中某个元素: <s:property value="dogs[1]" /> <br /> 访问Map: <s:property value="dogMap" /> <br /> 访问Map中某个元素: <s:property value="dogMap.dog101" /> <br /> | <s:property value="dogMap['dog101']" /> <br /> | <s:property value="dogMap["dog101"]" /> <br /> 访问Map中所有的key: <s:property value="dogMap.keys" /> <br /> 访问Map中所有的value: <s:property value="dogMap.values" /> <br /> 访问容器的大小： <s:property value="dogMap.size()" /> <br /> | <s:property value="users.size" /> <br /> 投影（过滤）: <s:property value="users.{?#this.age==1}[0]" /> <br /> 投影: <s:property value="users.{^#this.age>1}.{age}" /> <br /> 投影: <s:property value="users.{$#this.age>1}.{age}" /> <br /> 投影: <s:property value="users.{$#this.age>1}.{age}==null" /> <br /> []: value stack从上往下数<s:property value="[0].username" /> </body> </html>
输入网址
http://localhost:8081/maShiBing/ognl/ognl?password=p&username=u&user.age=9&cat.friend.name=fuck
运行结果为
