Struts 2之Servlet API

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Struts 2对Servlet API进行了封装，是业务层更加独立，如果需要调用Request、Response等Servlet API有两种途径
利用ServletActinContext的静态方法
Struts 2利用ServletActinContext来维护Servlet对象，ServletActinContext利用ThreadLocal来维护不同线程的Servlet对象，因此可以使用ServletActinContext来获得Servlet的各种对象
import  org.apache.struts2. ServletActinContext;public  class  LoginActin extends ActionSupport{       public String login(){             HttpServletRequest request = ServletActinContext.getRequest();             HttpServletResponse response = ServletActinContext.getResponse();             HttpServletContext context = ServletActinContext.getServletContext();             HttpSession session = request.getSession();             ……      }     }
利用相关的Aware接口
Struts 2在实例化一个Action实例时，如果发现它实现了相关的Aware接口，会把相应的资源通过Aware接口方法注射进去，Aware接口其实是一种拦截器
Servlet API常用对象application、request、response、session对应的Aware接口分别为ServletContextAware、ServletRequestAware、ServletResponseAware、SessionAware
public class ServletAwareActionextends ActionSupport implementsServletContextAware,ServletRequestAware,ServletResponseAware,SessionAware{       private HttpServletRequest request ;      private HttpServletResponse response;      private HttpServletContext application;      private HttpSession session ;       //相应的setter方法      public void setServletRequest(HttpServletRequest request ){             this.request = request;      }      public void setServletResponse(HttpServletResponse response ){             this.reponse = reponse;      }      public void setServletContext(HttpServletContext application ){             this. application = application;      }      public void setSession(Map sessionValues){             this.session = sessionValues;      }      //然后可以在Action中直接使用这些对象      public String execute(){             request.getRemoteAddr();             response.getContentType()             session.get(“account”);             return SUCCESS;      }}

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