在写struts2拦截器的时候，有时会需要获取session对象或request对象，可以用以下方式来获取
// 获取session
Map<String, Object> session = invocation.getInvocationContext()
.getSession();
//获取request
ActionContext ac = invocation.getInvocationContext();
HttpServletRequest request = (HttpServletRequest) ac
.get(ServletActionContext.HTTP_REQUEST);
转播
