Action类中获取servlet api

一 经过ActionContext类获取

下面获取的request和session都是map对象

ActionContext actionContext = ActionContext.getContext();
Map<String, Object> request = actionContext.getContextMap();
Map<String, Object> session = actionContext.getSession();

或者还有一种方式

HttpServletRequest request = (HttpServletRequest)ActionContext.getContext().get(StrutsStatics.HTTP_REQUEST);
HttpSession session = request.getSession();

该类提供了以下几种方法：

Object get(Object key)

等同于调用HttpServletRequest的getAttribute(String name)方法

Map getApplication()

返回一个Map对象，该对象模拟了该应用的ServletContext实例。

static ActionContext getContext()

这是个静态方法 获取系统的ActionContext实例

Map getParameters()

获取全部的请求参数，相似于调用HttpServletRequest对象的getParameterMap()方法

Map getSession()

返回一个Map对象，该对象模拟了HttpSession 实例

void setApplication(Map application)

传入一个Map实例，将Map实例的key-value转换成application的属性名-值。

void setSession(Map session)

传入一个Map实例，将Map实例的key-value转换成application的属性名-值。

 

二 经过ServletActionContext类获取

HttpServletRequest request = ServletActionContext.getRequest();
HttpSession session = request.getSession();

该类提供了以下几种方法:

static PageContext getPageContext()

获取PageContext对象。

static HttpServletRequest getRequest()

获取HttpServletRequest对象。

static HttpServletResponse getResponse()

获取HttpServletResponse对象。

static ServletContext getServletContext()

获取ServletContext对象。

 

三 经过实现相应接口获取

Struts2提供了以下几个接口用于获取Servlet API：

ServletContextAware

实现该接口的Action能够直接访问Web应用的ServletContext实例。

ServletRequestAware

实现该接口的Action能够直接访问Web应用的ServletRequest实例。

ServletResponseAware

实现该接口的Action能够直接访问Web应用的ServletRsponse实例。

SessionAware，RequestAware，ApplicationAware

获取的session、request、application都是map对象。

package cn.iborder.action;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import org.apache.struts2.interceptor.ServletRequestAware;
import com.opensymphony.xwork2.ActionSupport;
import cn.iborder.entity.User;


public class UserAction2 extends ActionSupport implements ServletRequestAware{
	private User user;
	//获取servlet api
	private HttpServletRequest request;
    private HttpSession session;
    private ServletContext application;

	public User getUser() {
		return user;
	}

	public void setUser(User user) {
		this.user = user;
	}

	public String login() {
		System.out.println("用户："+user.getUserName());
		System.out.println("密码："+user.getPassword());
		session.setAttribute("userName", user.getUserName());
		return "success";
	}
	
	public String logout() {
		System.out.println(session.getAttribute("userName")+"成功注销");
		session.removeAttribute("userName");
		return "logout";
	}

	@Override
	public void setServletRequest(HttpServletRequest request) {
		// TODO Auto-generated method stub
		this.request=request;
        this.session=request.getSession();
        this.application=session.getServletContext();
	}
}

或者

package cn.iborder.action;

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.ActionSupport;

import cn.iborder.entity.User;

/**
 * Struts2提供了以下几个接口使Action能够直接访问到Servlet API：
 * 1：ServletContextAware：实现该接口的Action能够直接访问Web应用的ServletContext实例
 * 2：ServletRequestAware:实现该接口的Action能够直接访问Web应用的ServletRequest实例.
 * 3：ServletResponseAware:实现该接口的Action能够直接访问Web应用的ServletRsponse实例.
 */
public class UserAction4 extends ActionSupport implements  SessionAware,RequestAware,ApplicationAware{
	private User user;
	//获取servlet api
	private Map<String, Object> request;
    private Map<String, Object> session;
    private Map<String, Object> application;

	public User getUser() {
		return user;
	}

	public void setUser(User user) {
		this.user = user;
	}

	public String login() {
		System.out.println(this.getClass().getSimpleName());
		System.out.println("用户："+user.getUserName());
		System.out.println("密码："+user.getPassword());
		session.put("userName", user.getUserName());
		return "success";
	}
	
	public String logout() {
		System.out.println(session.get("userName")+"成功注销");
		session.remove("userName");
		return "logout";
	}

	@Override
	public void setApplication(Map<String, Object> applicate) {
		// TODO Auto-generated method stub
		this.application = applicate;
	}

	@Override
	public void setRequest(Map<String, Object> request) {
		// TODO Auto-generated method stub
		this.request = request;
	}

	@Override
	public void setSession(Map<String, Object> session) {
		// TODO Auto-generated method stub
		this.session = session;
	}
}