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>