Struts学习笔记：request，session,application的创建

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1.method 解耦(map)的方式创建。

此方法创建的request,session,application只有存储键值队和作用域的特性，不具有httpservlet对应的方法,该方法有两种创建方式

A、直接获取,通过ActionContext类获取request,session,application
但是request并不能直接获取可调用get(“request”);方法实现一个存放 request的map

public class MyActionForScope extends ActionSupport{    @Override    public String execute() throws Exception {        ActionContext ac = ActionContext.getContext();        Map<String, Object> application = ac.getApplication();        Map<String, Object> request = (Map<String, Object>)ac.get("request");        Map<String, Object> session = ac.getSession();        request.put("requestvalue", "设置request的值");        session.put("sessionvalue", "设置session的值");        application.put("aplicationvalue", "设置application的值");        return "success";    }}

B、实现struts2对应的接口：SessionAware,RequestAware,ApplicationAware，重写setXXX方法

public class MyActionForScope extends ActionSupport implements     RequestAware,SessionAware,ApplicationAware{    private Map<String, Object> request;    private Map<String, Object> session;    private Map<String, Object> application;    public void setApplication(Map<String, Object> application) {            this.application=application;    }    public void setRequest(Map<String, Object> request) {            this.request=request;    }    public void setSession(Map<String, Object> session) {            this.session=session;    }    @Override    public String execute() throws Exception {        request.put("requestvalue", "设置request的值");        session.put("sessionvalue", "设置session的值");        application.put("aplicationvalue", "设置application的值");        return "success";    }}

2.method 耦合(servlet)的方式创建。

此方法创建的request,session,application 使用,httpServletRequest,ServletContext接口设置属性值,该方法有两种创建方式

A、直接利用ServletActionContext获取

public class MyActionForScope extends ActionSupport{    @Override    public String execute() throws Exception {        HttpServletRequest request = ServletActionContext.getRequest();        ServletContext app = ServletActionContext.getServletContext();        request.setAttribute("requestvalue", "设置request的值");        HttpSession session = request.getSession();        session.setAttribute("sessionvalue", "设置session的值");        app.setAttribute("aplicationvalue", "设置application的值");        return "success";    }}

B、实现struts2对应的接口：ServletRequestAware,ServletContextAware，重写setXXX方法

public class MyActionForScope extends ActionSupport implements ServletRequestAware,ServletContextAware{      private HttpServletRequest request;      private ServletContext application;      public void setServletRequest(HttpServletRequest request) {           this.request= request;      }      public void setServletContext(ServletContext application) {      this.application = application;       }      @Override       public String execute() throws Exception {      request.setAttribute("requestvalue", "设置request的值");      HttpSession session= request.getSession();       session.setAttribute("sessionvalue","设置session的值");       application.setAttribute("aplicationvalue","设置application的值");       return "success";      }}

date:2016-10-19 author:matosiki
note:实现request,session,application等作用域或对象

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