Struts 中施用request

Struts 中使用request

在struts2中有两种方式可以得到这些对象

1、非IoC方式

要获得上述对象，关键Struts 2中com.opensymphony.xwork2.ActionContext类。我们可以通过它的静态方法getContext()获取当前Action的上下文对象。有了这个对象我们想获得其他几个对象就好办了

ActionContext ctx = ActionContext .getContext(); Map session = ctx.getSession(); 细心的朋友可以发现这里的session是个map对象在Struts2中底层的session都被封装成了Map类型我们可以直接操作这个map 进行对session的写入和读取操作而不用去直接操作HttpSession对象

另外，org.apache.struts2.ServletActionContext作为辅助类（Helper Class），可以帮助您快捷地获得这几个对象。

HttpServletRequest request = ServletActionContext. getRequest(); HttpServletResponse response = ServletActionContext. getResponse(); HttpSession session = request.getSession(); 如果你只是想访问session的属性（Attribute），你也可以通过ActionContext .getContext().getSession()获取或添加session范围（Scoped）的对象。

2、IoC方式（这种方式在tapestry中也是这样实现的） 要使用IoC方式，我们首先要告诉IoC容器（Container）想取得某个对象的意愿，通过实现相应的接口做到这点。具体实现

import?java.util.Map; ????import?javax.servlet.http.HttpServletRequest; ??import?javax.servlet.http.HttpServletResponse; ??import?javax.servlet.http.HttpSession; ????import?org.apache.struts2.interceptor.ServletRequestAware; ??import?org.apache.struts2.interceptor.ServletResponseAware; ??import?org.apache.struts2.interceptor.SessionAware; ????import?com.opensymphony.xwork2.ActionSupport; ????public?class?IoCServlet?extends?ActionSupport?implements?SessionAware, ??????????ServletRequestAware,?ServletResponseAware?{ ??????private?String?message; ??????private?Map?att; ??????private?HttpServletRequest?request; ??????private?HttpServletResponse?response; ????????public?String?getMessage()?{ ??????????return?message; ??????} ????????public?void?setSession(Map?att)?{ ??????????this.att?=?att; ??????} ????????public?void?setServletRequest(HttpServletRequest?request)?{ ??????????this.request?=?request; ??????} ????????public?void?setServletResponse(HttpServletResponse?response)?{ ??????????this.response?=?response; ??????} ????????@Override??????public?String?execute()?{ ??????????att.put("msg",?"Hello?World?from?Session!"); ????????????HttpSession?session?=?request.getSession(); ??????????StringBuffer?sb?=?new?StringBuffer("Message?from?request:?"); ??????????sb.append(request.getParameter("msg")); ??????????sb.append("?Response?Buffer?Size:?"); ??????????sb.append(response.getBufferSize()); ??????????sb.append("?Session?ID:?"); ??????????sb.append(session.getId()); ????????????message?=?sb.toString(); ??????????return?"success"; ??????} ??}??