struts2使用：Action如何使用request,session,application

一种方法是利用工具类ActionContext,ServletActionContext

另一种是通过实现Action接口,利用接口约定的方法注入.(推荐)，下面是这种方案的示例

 

package utils;

import java.util.Map;

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

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 org.apache.struts2.util.ServletContextAware;
/***
 * Action如何使用request,session,application:
 * 要Action实现以下Aware接口,利用接口约定的方法注入.(推荐)
 * 原因:减少了Struts2框架API对Action类的侵入,提高Action的灵活性.
 * RequestAware、SessionAware、ApplicationAware、ServletRequestAware、ServletContextAware
 * @author huawei
 *
 */
public class BaseAction implements RequestAware,SessionAware,ApplicationAware,
       ServletRequestAware,ServletContextAware{
 
 public Map<String, Object> request;
 public Map<String, Object> session;
 public Map<String, Object> application;
 public HttpServletRequest httpRequest;
 public HttpSession httpSession;
 public ServletContext httpApplication;
 
 @Override
 public void setServletContext(ServletContext httpApplication) {
  this.httpApplication = httpApplication;
 }

 @Override
 public void setServletRequest(HttpServletRequest httpRequest) {
  this.httpRequest = httpRequest;
  this.httpSession = httpRequest.getSession();
 }

 @Override
 public void setApplication(Map<String, Object> application) {
  this.application = application;
 }

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

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