Struts2中获取request,session,application对象

第一种方式：获取map类型的request,session,application

package com.maya.action;

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

public class RSAAction extends ActionSupport {
    
    //获取map类型的request,session,application
    private Map<String, Object> request;
    private Map<String, Object> session;
    private Map<String, Object> application;
    private ActionContext context;
    //为了方便在构造函数中获取ActionContext对象
    public RSAAction(){
        context=ActionContext.getContext();
    }
    //以下获取map类型的request,session,application
    @Override
    public String execute() throws Exception {
        //获取map类型的request
        request=(Map<String, Object>) context.get("reqeust");
        request.put("key", "value");
        
        //获取map类型的session
        session=context.getSession();
        session.put("key", "value");
        
        //获取map类型的application
        application=context.getApplication();
        application.put("key", "value");
                
        return super.execute();
    }    
}

第二种方式：采用接口方式获得map类型的request、session、application

package com.maya.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 RSAAction extends ActionSupport implements RequestAware,SessionAware,ApplicationAware {
    private Map<String, Object> request;
    private Map<String, Object> session;
    private Map<String, Object> application;
    
    //获取reqeust
    @Override  
    public void setRequest(Map<String, Object> reqeust) {
        this.request=reqeust;
        
    }
    //获取session
    @Override
    public void setSession(Map<String, Object> session) {
        this.session=session;
        
    }
    //获取application
    @Override
    public void setApplication(Map<String, Object> application) {
        this.application=application;
        
    }
    
    @Override
    public String execute() throws Exception {
        //赋值方式
        request.put("key", "value");
        session.put("key", "value");
        application.put("key", "value");        
        return super.execute();
    }    
}

第三种方式：获取Http类型的request、session、application

package com.maya.action;

import java.util.Map;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import com.opensymphony.xwork2.ActionSupport;

public class RSAAction extends ActionSupport {
    //获取Http类型的request、session、application
    private HttpServletRequest request;
    private HttpSession session;
    private ServletContext application;
    
    public RSAAction(){
        request=ServletActionContext.getRequest();
        session=request.getSession();
        application= session.getServletContext();
    }
    
    @Override
    public String execute() throws Exception {
        
        request.setAttribute("key", "value");
        session.setAttribute("key", "value");
        application.setAttribute("key", "value");        
        
        return super.execute();
    }    
}