OGNL在struts2中的使用

下面是在JSP上使用struts2和OGNL读取Action中数据的例子。 Cat:

package com.action.ognl;

public class Cat {
    private String name;
    private int age;
    private String color;
    
    public Cat(String name,int age,String color)
    {
        this.name=name;
        this.age=age;
        this.color=color;
    }
    public Cat()
    {
        
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getColor() {
        return color;
    }
    public void setColor(String color) {
        this.color = color;
    }
    
}

Person:

package com.action.ognl;

import java.util.Map;

public class Person {
    private String name;
    private int age;
    private String address;
    private String[] friends;
    private Cat cat;
    private Map map;
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public String getAddress() {
        return address;
    }
    public void setAddress(String address) {
        this.address = address;
    }
    public String[] getFriends() {
        return friends;
    }
    public void setFriends(String[] friends) {
        this.friends = friends;
    }
    public Cat getCat() {
        return cat;
    }
    public void setCat(Cat cat) {
        this.cat = cat;
    }
    public Map getMap() {
        return map;
    }
    public void setMap(Map map) {
        this.map = map;
    }
    public Person(String name, int age, String address, String[] friends,
            Cat cat, Map map) {
        super();
        this.name = name;
        this.age = age;
        this.address = address;
        this.friends = friends;
        this.cat = cat;
        this.map = map;
    }
    public Person() {

    }
    
}

OgnlAction：

package com.action.ognl;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.struts2.interceptor.ApplicationAware;
import org.apache.struts2.interceptor.RequestAware;
import org.apache.struts2.interceptor.SessionAware;

import com.opensymphony.xwork2.ActionSupport;

public class OgnlAction extends ActionSupport implements RequestAware,SessionAware,ApplicationAware {
    String username;
    private String password;
    private Map requestMap;
    private Map sessionMap;
    private Map applicationMap;
    private List list;
    
    public OgnlAction() {
        list=new ArrayList();
    }
    public List getList() {
        return list;
    }

    public void setList(List list) {
        this.list = list;
    }

    @Override
    public void setRequest(Map arg0) {
        // TODO Auto-generated method stub
        this.requestMap=arg0;
    }

    @Override
    public void setApplication(Map arg0) {
        // TODO Auto-generated method stub
        this.applicationMap=arg0;
    }

    @Override
    public void setSession(Map arg0) {
        // TODO Auto-generated method stub
        this.sessionMap=arg0;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        System.out.println("setUsername");
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
    
    @Override
    public String execute() throws Exception {
        // TODO Auto-generated method stub
        requestMap.put("hello", "world");
        sessionMap.put("hello", "world");
        applicationMap.put("hello", "world");
        
        Cat cat1=new Cat("cat1",20,"red");
        Cat cat2=new Cat("cat2",30,"black");
        
        String[] friends1={"test1","test2","test3"};
        String[] friends2={"welcom1","welcom2","welcom3"};
        
        Map map1=new HashMap();
        Map map2=new HashMap();
        map1.put("test1", "test1");
        map1.put("test2", "test2");
        
        map2.put("hello1", "hello1");
        map2.put("hello2", "hello2");
        Person person1=new Person("zhangsan", 20, "beijing", friends1, cat1, map1);
        Person person2=new Person("lisi", 40, "hangzou", friends2, cat2, map2);
        System.out.println(person1);
        list.add(person1);
        list.add(person2);
        
        return SUCCESS;
    }
    
}

Ognl.jsp(OgnlAction的result定义转发)

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags" %>




Insert title here


取Action中的属性
username:
password:

取post,get参数:
username:
password:

取request,session,application属性
request:
session:
application:

取对象各种属性:
Person1.address:
Person2.age:
Person2.map:

过滤:

    name:
    address:

投影(取指定属性):