//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
     
       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
      
        ms= ac.getSession();        System.out.println("ses1="+ms.get("ses1"));        ms.put("ses2", "2ses");                //3获取request资源        Map
       
         mq=(Map
        
         )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
         
           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
     
       mp;    private Map
      
        ms;    private Map
       
         mq;    private Map
        
          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
         
           arg0) {        // TODO 自动生成的方法存根        //接收        mp=arg0;    }         @Override    public void setSession(Map
          
            arg0) { // TODO 自动生成的方法存根 ms=arg0; } @Override public void setRequest(Map
           
             arg0) { // TODO 自动生成的方法存根 mq=arg0; } @Override public void setParameters(Map
            
              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";    }    }