Structs复习 OGNL
Dominmodel只有传 User.age 类似的这种Structs才能帮创建对象
Dominmodel User里必须有空的构造方法
OGNL:OBJECT GRAPHIC NAVAGATION LABGUAGE
jar包：
web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
Structs.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <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/bjsxt/struts2/ognl/ognl.xml"/> </struts>
ognl.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <package name="ognl" extends="struts-default"> <action name="ognl" class="com.bjsxt.struts2.ognl.OgnlAction"> <result>/ognl.jsp</result> </action> <action name="test" class="com.bjsxt.struts2.ognl.TestAction"> <result type="chain">ognl</result> </action> </package> </struts>
OgnlAction.Java
package com.bjsxt.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 Cat cat; private Map<String, Dog> dogMap = new HashMap<String, Dog>(); private Set<Dog> dogs = new HashSet<Dog>(); private String password; private User user; private String username; private List<User> users = new ArrayList<User>(); 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 Cat getCat() { return cat; } public Map<String, Dog> getDogMap() { return dogMap; } public Set<Dog> getDogs() { return dogs; } public String getPassword() { return password; } public User getUser() { return user; } public String getUsername() { return username; } public List<User> getUsers() { return users; } 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; } }
TestAction.java
package com.bjsxt.struts2.ognl; import com.opensymphony.xwork2.ActionSupport; public class TestAction extends ActionSupport { @Override public String execute() throws Exception { return super.execute(); } }
Cat.java
package com.bjsxt.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.bjsxt.struts2.ognl; 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; } }
S.Java
package com.bjsxt.struts2.ognl; public class S { public static String STR = "STATIC STRING"; public static String s() { return "static method"; } }
User.Java
package com.bjsxt.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; } }
index.jsp
<?xml version="1.0" encoding="GB18030" ?> <%@ page language="java" contentType="text/html; charset=GB18030" pageEncoding="GB18030"%> <% String contextPath = request.getContextPath(); %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <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 <a href="<%=contextPath %>/ognl.action?username=u&password=p">ognl</a> </body> </html>
ognl.jsp
具体用法参考
<?xml version="1.0" encoding="GB18030" ?> <%@ page language="java" contentType="text/html; charset=GB18030" pageEncoding="GB18030"%> <%@ taglib uri="/struts-tags" prefix="s" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=GB18030" /> <title>OGNL表达式语言学习</title> </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.bjsxt.struts2.ognl.S@s()"/></li> <li>访问静态属性：<s:property value="@com.bjsxt.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.bjsxt.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>
