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;

/**
 * 使用特定介面訪問Servlet物件
 * @author Switch
 *
 *  
 
[email protected]
 *  [email protected]
 *  [email protected]
 *  [email protected]
 *  是由一個名稱為servletConfig的攔截器為我們封裝的
 */
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;
    }

    @Override
    public void setServletRequest(HttpServletRequest request) {
        this.request = request;
    }

    @Override
    public void setServletResponse(HttpServletResponse response) {
        this.response = response;
    }

    @Override
    public 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;
/**
 * 訪問ServletAPI的方式
 *
 * 使用Struts2框架提供了一個工具類：
 *         ServletActionContext
 * 它裡面提供了對應的靜態方法，可以直接獲取ServletAPI
 *
 * 有一個需要注意的問題：
 *        
 
[email protected]
 *        [email protected]
 *        [email protected]
 *        [email protected]
 *
 *        requet物件已經不是原來tomcat提供的了，而是被struts2框架包裝過了。
 *         包裝使用的是裝飾者模式。
 *        裝飾者模式的作用是對方法進行增強。
 *
 * @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類介紹
 *      它是Struts2框架為我們提供的一個工具類。
 *      該類可以通過方法直接獲取request,response,servletContext物件
 * @author Switch
 * 
 *  context.getParameters(); == request.getParameterMap(); 獲取的是請求引數
 */
public class ActionTest8 extends ActionSupport implements StrutsStatics {

    private HttpServletRequest request;
    private HttpServletResponse response;
    private ServletContext application;

    /**
     * 使用ActionContext訪問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());
        /*[email protected]
        [email protected]
        [email protected]
        [email protected]*/

        return SUCCESS;
    }

    /**
     * 使用原始ServletAPI物件，往session域和application域中存入資料
     * 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.獲取session物件
        HttpSession session = ServletActionContext.getRequest().getSession();
        //存入資料
        session.setAttribute("sessionAttr", "hello session attr");
        session.getId();
        //2.獲取ServletContext
        ServletContext application = ServletActionContext.getServletContext();
        application.getRealPath("/WEB-INF/uploads");
        //存入資料
        application.setAttribute("applicationAttr", "hello application attr");
        return SUCCESS;
    }


    /**
     * 使用ActionContext類中的getSession()和getApplication()獲取到的map來往map中存入資料
     * 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.獲取ActionContext物件
        ActionContext context = ActionContext.getContext();
        //2.獲取sessionMap
        Map<String,Object> sessionMap = context.getSession();
        sessionMap.put("sessionAttr", "hello session map");
        //3.獲取applicationMap
        Map<String,Object> applicationMap = context.getApplication();
        applicationMap.put("applicationAttr", "hello application map");
        return SUCCESS;
    }

}