struts2 获取request、session的方法

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

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");

<!--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

//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

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

//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;
}