Struts2 ActionContext备忘
ActionContext为Struts提供数据环境，维护着一个Map结构,ValueStack中的每一个元素都是根对象,Action位于ValueStack的最顶层.ActionContext中封装了servlet对象,从而将Action与Servlet解耦 (即Action无需依赖任何Servlet API).
Map结构如图:
获取request、session的方法
2.1 与servlet无关:
2.1.1 非IoC模式
Java代码
ActionContext context ;//该方法还可以取得值栈（getValueStack()）,使用push（obj）往值栈中放数据
Map request ;
Map session ;
Map application ;
//以下初始化方法要放在方法中
context = ActionContext.getContext();
request = (Map)context.get("request");//获取request
session = context.getSession();//获取session
application = context.getApplication();//获取application
request.put("req", "request属性");
session.put("ses", "session属性");
application.put("app", "application属性");
ActionContext context ;//该方法还可以取得值栈（getValueStack()）,使用push（obj）往值栈中放数据
Map request ;
Map session ;
Map application ;
//以下初始化方法要放在方法中
context = ActionContext.getContext();
request = (Map)context.get("request");//获取request
session = context.getSession();//获取session
application = context.getApplication();//获取application
request.put("req", "request属性");
session.put("ses", "session属性");
application.put("app", "application属性");
Xml代码
<!--jsp中取值-->
request属性接受:<s:property value="#request.req"/>${requestScope.req}
session属性接受:<s:property value="#session.ses"/>${sessionScope.ses}
application属性接受：<s:property value="#application.app"/>${applicationScope.app}
<!--jsp中取值-->
request属性接受:<s:property value="#request.req"/>${requestScope.req}
session属性接受:<s:property value="#session.ses"/>${sessionScope.ses}
application属性接受：<s:property value="#application.app"/>${applicationScope.app}
2.1.2 IoC模式
Java代码
//实现接口
public class LoginAction extends ActionSupport implements RequestAware,SessionAware,ApplicationAware
Map request ;
Map session ;
Map application ;
public void setRequest(Map request) {
this.request = request;
}
public void setSession(Map session) {
this.session = session;
}
public void setApplication(Map application) {
this.application = application;
}
//实现接口
public class LoginAction extends ActionSupport implements RequestAware,SessionAware,ApplicationAware
Map request ;
Map session ;
Map application ;
public void setRequest(Map request) {
this.request = request;
} public void setSession(Map session) { this.session = session; } public void setApplication(Map application) { this.application = application; } 2.2 与servlet有关
2.2.1 非IoC模式
Java代码
HttpServletRequest request;
HttpSession session ;
ServletContext application;
request = ServletActionContext.getRequest();//获取request
session = request.getSession();
application = ServletActionContext.getServletContext();//获取application
request.setAttribute("req", "request属性111");
session.setAttribute("ses", "session属性111");
application.setAttribute("app", "application属性111");
HttpServletRequest request;
HttpSession session ;
ServletContext application;
request = ServletActionContext.getRequest();//获取request
session = request.getSession();
application = ServletActionContext.getServletContext();//获取application
request.setAttribute("req", "request属性111");
session.setAttribute("ses", "session属性111");
application.setAttribute("app", "application属性111");
2.2.1 IoC模式
Java代码
//实现接口
public class LoginAction extends ActionSupport implements ServletRequestAware,ServletContextAware
HttpServletRequest request;
ServletContext application;
public void setServletRequest(HttpServletRequest request) {
this.request = request;
}
public void setServletContext(ServletContext application) {
this.application = application;
}