获取session、request、parmeter的方法

package com.hanqi.action;

import java.util.Map;

import com.opensymphony.xwork2.ActionContext;

public class TestAction {

    //解耦方式
    //封装了WEB资源
    //使用ActionContext
    @SuppressWarnings("unchecked")
    public String testweb()
    {
        //访问web资源
        System.out.println("经过了action类");
        //单例模式
        //Action实例的上下文对象
        ActionContext ac= ActionContext.getContext();
        //1、获取application
        Map<String, Object>mapApp = ac.getApplication();

        System.out.println("app1="+mapApp.get("app1"));
        //放入新的键值对
        mapApp.put("app2", "新放入的application");
        //2、获取session资源
        Map<String, Object>mapSes=ac.getSession();
        System.out.println("ses1="+mapSes.get("ses1"));
        //放入新的值
        mapSes.put("ses2","放入的新的session");
        mapSes.remove("ses1");
        //3、获取request资源
        Map<String, Object>mapReq= (Map<String, Object>) ac.get("request");
        //不能直接获取之前的request属性
        System.out.println("req1="+mapReq.get("req1"));
        //可以放入新的request的属性
        mapReq.put("req2", "放入新的request");
        //4、直接获取传递的参数
        Map<String, Object>mapPar=ac.getParameters();
        //参数值被封装成String数组
        String[] str=(String[])mapPar.get("user");
        for(String t:str)
        {
        System.out.println("user="+t);
        }
        //放入新的参数不能被获取到
        mapPar.put("pw", new String[]{""});
        return "success";

    }

}

package com.hanqi.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 TestActionAware implements ApplicationAware,SessionAware,RequestAware,ParameterAware{
    private Map<String, Object>mapApp;
    private Map<String, Object>mapSes;
    private Map<String, Object>mapReq;
    private Map<String, String[]>mapPar;
    //实现ApplicationAware的方法
    //提供给struts2，放入application的数据集合
    @Override
    public void setApplication(Map<String, Object> arg0) {

        //接受
        mapApp=arg0;

    }
    public String testAware()
    {
        //访问application
        System.out.println("app1="+mapApp.get("app1"));

        mapApp.put("app2", "以Aware放入的application");

        //访问session
        System.out.println("ses1="+mapSes.get("ses1"));
        mapSes.put("ses2", "以Aware放入的Session");
        //访问 request
        System.out.println("req="+mapReq.get("req1"));
        mapReq.put("req2", "以Aware放入的request");
        //访问Parameter
        String[]str=mapPar.get("user");
        for(String t:str)
        {
        System.out.println("user"+t);
        }
        mapPar.put("pw", new String[]{""});
        return "success";
    }

    @Override
    public void setSession(Map<String, Object> arg0) {

        mapSes=arg0;
    }

    @Override
    public void setRequest(Map<String, Object> arg0) {

        mapReq=arg0;
    }

    @Override
    public void setParameters(Map<String, String[]> arg0) {

        mapPar=arg0;
    }

}

package com.hanqi.action;

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

import org.apache.struts2.ServletActionContext;

public class TestServletAction {

    public String testServletAction()
    {
        //访问原生的web资源
        //得到ServletContext,相当于application
        ServletContext sc=ServletActionContext.getServletContext();
        System.out.println("app1="+sc.getAttribute("app1"));
        sc.setAttribute("app2", "原生方式放入的内容");
        //2、访问session
        HttpServletRequest hsr=ServletActionContext.getRequest();
        HttpSession hs=hsr.getSession();
        System.out.println("ses1="+hs.getAttribute("ses1"));
        hs.setAttribute("ses2", "原生方式放入的内容");

        //3、访问request
        System.out.println("req1="+hsr.getAttribute("req1"));

        hsr.setAttribute("req2", "原生方式放入的request");
        //4、访问parameter
        System.out.println("user1="+hsr.getParameter("user"));
        System.out.println("user2="+hsr.getParameter("user"));
        return "success";
    }

}

package com.hanqi.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 TestServletActionAware implements ServletRequestAware, ServletContextAware {

    private ServletContext sc;
    private HttpServletRequest hsr;
    private HttpSession hs;
    @Override
    public void setServletContext(ServletContext arg0) {
        sc=arg0;

    }

    @Override
    public void setServletRequest(HttpServletRequest arg0) {
        hsr=arg0;
        hs=arg0.getSession();

    }
    public String testServletAware()
    {
        System.out.println("app1= "+sc.getAttribute("app1"));
        sc.setAttribute("app2", "新的app2");
        System.out.println("ses1= "+hs.getAttribute("ses1"));
        hs.setAttribute("ses2", "新的ses2");
        System.out.println("user= "+hsr.getParameter("user"));

        return "success";
    }

}