struts2系列4：Struts2 Action(三) 访问web元素的四种方式

1： Map IoC  方式

package  com.action;

import  java.util.Map;

import  org.apache.struts2.interceptor.ApplicationAware;
import  org.apache.struts2.interceptor.RequestAware;
import  org.apache.struts2.interceptor.SessionAware;

import  com.opensymphony.xwork2.ActionSupport;

public   class  UserAction1  extends  ActionSupport  implements  RequestAware,SessionAware,ApplicationAware {
     private  Map < String, Object >  request;
     private  Map < String, Object >  session;
     private  Map < String, Object >  application;    
     public  String add(){
        request.put( " r1 " ,  " r1 " );
        session.put( " s1 " ,  " s1 " );
        application.put( " a1 " ,  " a1 " );
         return   " success " ;
    }
     public   void  setRequest(Map < String, Object >  request) {
         this .request = request;        
    }
     public   void  setSession(Map < String, Object >  session) {
         this .session = session;        
    }
     public   void  setApplication(Map < String, Object >  application) {
         this .application = application;
    }
}

2： Map 依赖容器 方式:

package  com.action;

import  java.util.Map;
import  com.opensymphony.xwork2.ActionContext;
import  com.opensymphony.xwork2.ActionSupport;

public   class  UserAction2  extends  ActionSupport {
     private  Map < String, Object >  request;
     private  Map < String, Object >  session;
     private  Map < String, Object >  application;    
     public  UserAction2() {
        ActionContext context  =  ActionContext.getContext();
        request = (Map < String, Object > )context.get( " request " );
        session = context.getSession();
        application = context.getApplication();
    }
     public  String add(){
        request.put( " r2 " ,  " r2 " );
        session.put( " s2 " ,  " s2 " );
        application.put( " a2 " ,  " a2 " );
         return   " success " ;
    }    
}

3： Servlet IoC  方式：

package  com.action;

import  javax.servlet.ServletContext;
import  javax.servlet.http.HttpServletRequest;
import  javax.servlet.http.HttpSession;
import  org.apache.struts2.interceptor.ServletRequestAware;
import  com.opensymphony.xwork2.ActionSupport;

public   class  UserAction3  extends  ActionSupport  implements  ServletRequestAware {
     private  HttpServletRequest request;
     private  HttpSession session;
     private  ServletContext application;
     public  String add() {
        request.setAttribute( " r3 " ,  " r3 " );
        session.setAttribute( " s3 " ,  " s3 " );
        application.setAttribute( " a3 " ,  " a3 " );
         return   " success " ;
    }
     public   void  setServletRequest(HttpServletRequest request) {        
         this .request = request;
         this .session = request.getSession();
         this .application = session.getServletContext();
    }
}

4： Servlet 依赖容器  方式:

package  com.action;

import  javax.servlet.ServletContext;
import  javax.servlet.http.HttpServletRequest;
import  javax.servlet.http.HttpSession;
import  org.apache.struts2.ServletActionContext;
import  com.opensymphony.xwork2.ActionSupport;

public   class  UserAction4  extends  ActionSupport  {
    private HttpServletRequest request;
    private HttpSession session;
    private ServletContext application;    
    public UserAction4() {
        request = ServletActionContext.getRequest();
        session=request.getSession();
        application=session.getServletContext();        
    }
    public String add(){
        request.setAttribute("r4", "r4");
        session.setAttribute("s4", "s4");
        application.setAttribute("a4", "a4");
        return "success";
    }    
}