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

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