package com.pc.web.action;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.ServletResponseAware;
import org.apache.struts2.util.ServletContextAware;import com.opensymphony.xwork2.ActionSupport;/*** 使用特定接口访问Servlet对象* @author Switch**  org.apache.struts2.dispatcher.StrutsRequestWrapper@461aa2*  org.apache.catalina.connector.ResponseFacade@7e83df*  org.apache.catalina.core.ApplicationContextFacade@3b102*  org.apache.catalina.session.StandardSessionFacade@5a214b*  是由一个名称为servletConfig的拦截器为我们封装的*/
public class ActionTest7 extends ActionSupport implements ServletRequestAware,ServletResponseAware,ServletContextAware {private HttpServletRequest request;private HttpServletResponse response;private ServletContext application;/*** @return*/public String demo(){System.out.println(request);System.out.println(response);System.out.println(application);System.out.println(request.getSession());return SUCCESS;}@Overridepublic void setServletRequest(HttpServletRequest request) {this.request = request;}@Overridepublic void setServletResponse(HttpServletResponse response) {this.response = response;}@Overridepublic void setServletContext(ServletContext application) {this.application = application;}
}

package com.pc.struts2.web.action;import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;import org.apache.struts2.ServletActionContext;import com.opensymphony.xwork2.ActionSupport;
/*** 访问ServletAPI的方式** 使用Struts2框架提供了一个工具类：*         ServletActionContext* 它里面提供了对应的静态方法，可以直接获取ServletAPI** 有一个需要注意的问题：*        org.apache.struts2.dispatcher.StrutsRequestWrapper@4637b3*        org.apache.catalina.connector.ResponseFacade@1f2f2f7*        org.apache.catalina.session.StandardSessionFacade@12d77c1*        org.apache.catalina.core.ApplicationContextFacade@1133ff**        requet对象已经不是原来tomcat提供的了，而是被struts2框架包装过了。*         包装使用的是装饰者模式。*        装饰者模式的作用是对方法进行增强。** @author Switch*/
public class ActionAPITest extends ActionSupport {/*** 在Struts2框架中使用ServletAPI* @return*/public String useServletAPI() {HttpServletRequest request = ServletActionContext.getRequest();HttpServletResponse response = ServletActionContext.getResponse();HttpSession session = request.getSession();ServletContext application = ServletActionContext.getServletContext();System.out.println(request);System.out.println(response);System.out.println(session);System.out.println(application);return "success";}
}

package com.pc.web.action;import java.util.Map;import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;import org.apache.struts2.ServletActionContext;
import org.apache.struts2.StrutsStatics;import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;/*** ActionContext类介绍*      它是Struts2框架为我们提供的一个工具类。*      该类可以通过方法直接获取request,response,servletContext对象* @author Switch* *  context.getParameters(); == request.getParameterMap(); 获取的是请求参数*/
public class ActionTest8 extends ActionSupport implements StrutsStatics {private HttpServletRequest request;private HttpServletResponse response;private ServletContext application;/*** 使用ActionContext访问ServletAPI* @return*/public String demo(){ActionContext context = ActionContext.getContext();request = (HttpServletRequest) context.get(HTTP_REQUEST);response = (HttpServletResponse) context.get(HTTP_RESPONSE);application = (ServletContext) context.get(SERVLET_CONTEXT);System.out.println(request);System.out.println(response);System.out.println(application);System.out.println(request.getSession());/*org.apache.struts2.dispatcher.StrutsRequestWrapper@112e422org.apache.catalina.connector.ResponseFacade@13f8b4corg.apache.catalina.core.ApplicationContextFacade@d244ddorg.apache.catalina.session.StandardSessionFacade@a711cb*/return SUCCESS;}/*** 使用原始ServletAPI对象，往session域和application域中存入数据* session域中存入         key=sessionAttr          value=hello session attr* application域中存入  key=applicationAttr     value=hello application attr* @return*/public String demo2(){//1.获取session对象HttpSession session = ServletActionContext.getRequest().getSession();//存入数据session.setAttribute("sessionAttr", "hello session attr");session.getId();//2.获取ServletContextServletContext application = ServletActionContext.getServletContext();application.getRealPath("/WEB-INF/uploads");//存入数据application.setAttribute("applicationAttr", "hello application attr");return SUCCESS;}/*** 使用ActionContext类中的getSession()和getApplication()获取到的map来往map中存入数据* sessionMap中存入         key=sessionAttr          value=hello session map* applicationMap中存入  key=applicationAttr     value=hello application map* @return*/public String demo3(){//1.获取ActionContext对象ActionContext context = ActionContext.getContext();//2.获取sessionMapMap<String,Object> sessionMap = context.getSession();sessionMap.put("sessionAttr", "hello session map");//3.获取applicationMapMap<String,Object> applicationMap = context.getApplication();applicationMap.put("applicationAttr", "hello application map");return SUCCESS;}}