Struts2——解耦方式

    //解耦,封装了web资源——1.使用ActionContext
    public String testweb()
    {
        //访问web资源
        System.out.println("OK");
        
        //单例模式，action实例的上下文对象
        ActionContext ac=ActionContext.getContext();
        
        //1获取application资源
        Map<String, Object> mp=ac.getApplication();
        
        System.out.println("app1="+mp.get("app1"));
        //放入新的键值对
        mp.put("app2", "2app");
        
        //2获取Session资源
        Map<String, Object> ms= ac.getSession();
        System.out.println("ses1="+ms.get("ses1"));
        ms.put("ses2", "2ses");
        
        //3获取request资源
        Map<String, Object> mq=(Map<String, Object>)ac.get("request");
        System.out.println("req1"+mq.get("req1"));    //取不到之前的值，只可以赋新值
        mp.put("req3", "3req");
        mq.put("req2", "2req");
        
        //4直接获取传递的参数Parameters
        Map<String, Object> mu=ac.getParameters();

        //返回结果为数组类型
        System.out.println("user="+mu.get("user"));
        
        //强制转型
        String[]str=(String[])mu.get("user");
        
        //遍历
        for(String a:str)
        {
            System.out.println(a);
        }
        
        //放入新参数不能被获取到
        mu.put("pw", new String[]{"1233"});//这么写是错误的
        
            
        return "success";
    }

package com.action;

import java.util.Map;

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

public class TestAware implements ApplicationAware,SessionAware,RequestAware,ParameterAware {
    
    private Map<String, Object> mp;
    private Map<String, Object> ms;
    private Map<String, Object> mq;
    private Map<String, String[]> mm;

    //实现ApplicationAware接口的方法
    //提供给Struts2，放入application的数据集合，进行调用
    @Override
    public void setApplication(Map<String, Object> arg0) {
        // TODO 自动生成的方法存根
        //接收
        mp=arg0;
    }
     
    @Override
    public void setSession(Map<String, Object> arg0) {
        // TODO 自动生成的方法存根
        ms=arg0;
    }
    
    @Override
    public void setRequest(Map<String, Object> arg0) {
        // TODO 自动生成的方法存根
        mq=arg0;
    }
    
    @Override
    public void setParameters(Map<String, String[]> arg0) {
        // TODO 自动生成的方法存根
        mm=arg0;
    }
    
    public String testAware()
    {
        //1访问application
        System.out.println("app1="+mp.get("app1"));
        mp.put("app2", "2222app");
        
        //2访问session
        System.out.println("ses1="+ms.get("ses1"));
        ms.put("ses2", "2222ses2");
        
        //3访问request
        System.out.println("req1="+mq.get("req1"));//之前设置的在这访问不到
        mq.put("req2", "2222req2");
        
        //4访问Parameter
        String[] str=mm.get("user");
        for(String a:str)
        System.out.println("suer="+a);
        
        mm.put("pw", new String[]{"122"});//在这设置获取不到
    
        
        
        return "success";
    }
    
}

package com.action;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;

public class TestServlet {

    public String testServlet()
    {
        //访问原生的web资源
        //1.得到ServletContext，相当于application
        ServletContext sc= ServletActionContext.getServletContext();
        System.out.println("app1="+sc.getAttribute("app1"));
        sc.setAttribute("app2", "你妹啊app2");
        
        //2.访问Session
         HttpServletRequest hsr=ServletActionContext.getRequest();//先得到request
        HttpSession hs=hsr.getSession();//得到Session
        System.out.println("ses1"+hs.getAttribute("ses1"));
         hsr.setAttribute("ses2", "原生2ses2");
        //3.访问request
        System.out.println("req1"+hsr.getAttribute("req1"));
        hsr.setAttribute("req2", "原生req2");
        //4.访问parameter
        System.out.println(hsr.getParameter("user"));
        System.out.println(hsr.getParameter("user"));

        return"success";
    }
    
    
}

package com.action;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.util.ServletContextAware;

public class TestServletAware implements ServletRequestAware, ServletContextAware {

    private ServletContext sc;
    private HttpServletRequest hsr;
    private HttpSession hs;
    
    @Override
    public void setServletContext(ServletContext arg0) {
        // TODO 自动生成的方法存根
        sc=arg0;
    }

    @Override
    public void setServletRequest(HttpServletRequest arg0) {
        // TODO 自动生成的方法存根
        hsr=arg0;
        hs=arg0.getSession();
    }
    
    public String testsa()
    {
        System.out.println("app1="+sc.getAttribute("app1"));
        sc.setAttribute("app2", "原生的app2");
        
        hsr.setAttribute("req2", "132req2");
        
        System.out.println("ses1="+hs.getAttribute("ses1"));
        hs.setAttribute("ses2", "123ses2");
        
        System.out.println("user="+hsr.getParameter("user"));
        
        return"success";
    }
    

}