struts2中取得request response session对象

struts2中获得request response session对象

1、非IoC方式

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?? ? 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();

2、IoC方式

???? 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

publicclass?IoCServlet?extends?ActionSupport?implements?SessionAware,?ServletRequestAware,?ServletResponseAware?{
????private?Map session;
????private?HttpServletRequest servletRequest;
????private?HttpServletResponse servletResponse;????
????
???
????
????publicvoid?setSession(Map session)?{
????????this.session?=?session;
????}
????
????publicvoid?setServletRequest(HttpServletRequest servletRequest)?{
????????this.servletRequest?=?servletRequest;
????}
????
????publicvoid?setServletResponse(HttpServletResponse servletResponse)?{
????????this.servletResponse?=?servletResponse;
????}
????
}

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3.通过ActionContext来获取

ActionContext ctx = ActionContext.getContext();        //获取HttpServletRequest 对象       HttpServletRequest request = (HttpServletRequest)ctx.get(ServletActionContext.HTTP_REQUEST);         //获取 HttpServletResponse对象     HttpServletResponse response = (HttpServletResponse)ctx.get(ServletActionContext.HTTP_RESPONSE);             //获取Application对象        //ServletActionContext.APPLICATION;   //获取Session对象         //ServletActionContext.SESSION;       //获取Page对象     //ServletActionContext.PAGE_CONTEXT

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