一，获取方式：

从Servlet容器中获取的方法 与Servlet容器无关的获取方法 IoC方式 非Ioc方式

 

二，获取方法

2.1 与servlet无关:

    2.1.1 非IoC模式

Java代码

1. ActionContext context ;//该方法还可以取得值栈（getValueStack()）,使用push（obj）往值栈中放数据  
2. Map request ;  
3. Map session ;  
4. Map application ;  
5.  
6. //以下初始化方法要放在方法中  
7. context = ActionContext.getContext();  
8.  
9. request = (Map)context.get("request");//获取request  
10. session = context.getSession();//获取session  
11. application = context.getApplication();//获取application  
12.  
13. request.put("req", "request属性");  
14. session.put("ses", "session属性");  
15. application.put("app", "application属性"); 

Xml代码

1. <!--jsp中取值--> 
2. request属性接受:<s:propertyvalue="#request.req"/>${requestScope.req}  
3. session属性接受:<s:propertyvalue="#session.ses"/>${sessionScope.ses}  
4. application属性接受：<s:propertyvalue="#application.app"/>${applicationScope.app} 

    2.1.2 IoC模式

Java代码

1. //实现接口  
2. publicclass LoginAction extends ActionSupport implements RequestAware,SessionAware,ApplicationAware  
3.  
4. Map request ;  
5. Map session ;  
6. Map application ;  
7.  
8. publicvoid setRequest(Map request) {  
9.         this.request = request;  
10. }  
11. publicvoid setSession(Map session) {  
12.     this.session = session;  
13. }  
14. publicvoid setApplication(Map application) {  
15.     this.application = application;  
16. }     

2.2 与servlet有关

    2.2.1 非IoC模式

Java代码

1. HttpServletRequest request;  
2. HttpSession session ;  
3. ServletContext application;  
4.  
5. request = ServletActionContext.getRequest();//获取request  
6. session = request.getSession();  
7. application = ServletActionContext.getServletContext();//获取application  
8.  
9. request.setAttribute("req", "request属性111");  
10. session.setAttribute("ses", "session属性111");  
11. application.setAttribute("app", "application属性111"); 

    2.2.1 IoC模式

Java代码

1. //实现接口  
2. publicclass LoginAction extends ActionSupport implements ServletRequestAware,ServletContextAware  
3.  
4.  
5. HttpServletRequest request;  
6. ServletContext application;  
7.  
8.  
9. publicvoid setServletRequest(HttpServletRequest request) {  
10.     this.request = request;  
11. }  
12. publicvoid setServletContext(ServletContext application) {  
13.     this.application = application;  
14. }