在struts2的action中操作域对象(request、session)

在struts2的Action中，操作域对象一共有三种方式：
1.ActionContext(与servelt API无关联):

1 //相当于request
2 ActionContext.getContext().put("userName", user.getUserName());
3 //相当于session
4 ActionContext.getContext().getSession().put("userName", user.getUserName());
5 //相当于Application
6 ActionContext.getContext().getApplication().put("userName", user.getUserName());
7 //parameter
8 String name = (String) ActionContext.getContext().getParameters().get("userName");

2.实现ServletRequestAware,ServletResponseAware接口，通过注入的方式，获取request、response:

 1 private HttpServletResponse response;
 2
 3 private HttpServletRequest request;
 4
 5 @Override
 6 public void setServletResponse(HttpServletResponse response) {
 7 this.response = response;
 8 }
 9
10 @Override
11 public void setServletRequest(HttpServletRequest request) {
12 this.request = request;
13 }

3.通过ServletActionContext提供的静态方法获得request、response:

1 HttpServletRequest request = ServletActionContext.getRequest();

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