获取session、request、parmeter的方法

时间：2023-12-24 16:10:55
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";

    }

}

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