Struts2访问request，session，application的四种方式

? 方式1--》访问Map类型的：

package cn.pdsu.edu;
import java.util.Map;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

/**
?* 普通方式：Map类型的request,session,application
?*/
public class ActionDemo1 extends ActionSupport {
??? private Map<String,Object> request;
??? private Map<String,Object> session;
??? private Map<String,Object> application;
???
??? public ActionDemo1() {
??? ??? this.request = (Map)ActionContext.getContext().get("request");
??? ??? this.session = ActionContext.getContext().getSession();
??? ??? this.application = ActionContext.getContext().getApplication();
??? }

??? @Override
??? public String execute() throws Exception {
??? ??? request.put("message", "message");
??? ??? session.put("message", "message");
??? ??? application.put("message", "message");
??? ??? return SUCCESS;
??? }
}

方式2--》访问map类型的：

package cn.pdsu.edu;
import java.util.Map;

import org.apache.struts2.interceptor.ApplicationAware;
import org.apache.struts2.interceptor.RequestAware;
import org.apache.struts2.interceptor.SessionAware;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

/**
?*接口方式：Map类型的request,session,application
?*/
public class ActionDemo2 extends ActionSupport implements RequestAware,SessionAware,ApplicationAware{
??? private Map<String,Object> request;
??? private Map<String,Object> session;
??? private Map<String,Object> application;

??? @Override
??? public String execute() throws Exception {
??? ??? request.put("message", "message");
??? ??? session.put("message", "message");
??? ??? application.put("message", "message");
??? ??? return SUCCESS;
??? }

??? public void setRequest(Map<String, Object> request) {
??? ??? this.request=request;
??? }

??? public void setSession(Map<String, Object> session) {
??? ??? this.session=session;
??? }

??? public void setApplication(Map<String, Object> application) {
??? ??? this.application = application;
??? }
}
方式3--》访问HttpServletRequest

package cn.pdsu.edu;
import java.util.Map;

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

import org.apache.struts2.ServletActionContext;
import org.apache.struts2.interceptor.ApplicationAware;
import org.apache.struts2.interceptor.RequestAware;
import org.apache.struts2.interceptor.SessionAware;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

/**
?* 普通方式：Servlet类型的request,session,application
?*/
public class ActionDemo3 extends ActionSupport {
??? private HttpServletRequest request;
??? private HttpSession session;
??? private ServletContext application;

??? public ActionDemo3() {
??? ??? request = ServletActionContext.getRequest();
??? ??? session = request.getSession();
??? ??? application = session.getServletContext();
??? }

??? @Override
??? public String execute() throws Exception {
??? ??? request.setAttribute("message", "message");
??? ??? session.setAttribute("message", "message");
??? ??? application.setAttribute("message", "message");
??? ??? return SUCCESS;
??? }
}
方式4--》通过接口访问HttpServletRequest

package cn.pdsu.edu;
import java.util.Map;

import javax.management.j2ee.statistics.ServletStats;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;
import org.apache.struts2.interceptor.ApplicationAware;
import org.apache.struts2.interceptor.RequestAware;
import org.apache.struts2.interceptor.ServletRequestAware;
import org.apache.struts2.interceptor.SessionAware;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

/**
?* 接口方式：Servlet类型的request,session,application
?*/
public class ActionDemo4 extends ActionSupport implements ServletRequestAware{
??? private HttpServletRequest request;
??? private HttpSession session;
??? private ServletContext application;

??? @Override
??? public String execute() throws Exception {
??? ??? request.setAttribute("message", "message");
??? ??? session.setAttribute("message", "message");
??? ??? application.setAttribute("message", "message");
??? ??? return SUCCESS;
??? }

??? public void setServletRequest(HttpServletRequest request) {
??? ??? this.request = request;
??? ??? this.session = request.getSession();
??? ??? this.application = session.getServletContext();
??? }
}