几种对数据的处理

package com.data;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;


import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;



/*
 * 数据操作
 */
import com.opensymphony.xwork2.ActionSupport;

public class DataAction extends ActionSupport {
	@Override
	public String execute() throws Exception {
		// TODO Auto-generated method stub
		//1、请求数据封装，2、调用servlet处理业务，拿到结果数据集
		
		//3、数据保存到域中
		
		//struts对数据的操作，方式一，直接拿到servletApi，执行操作
		HttpServletRequest request=ServletActionContext.getRequest();
		HttpSession session=request.getSession();
		ServletContext application=request.getServletContext();
		//操作
		request.setAttribute("request_data", "request_data");
		request.setAttribute("session_data", "session_data");
		request.setAttribute("application_data", "application_data");
		
		return SUCCESS;
	}
}

package com.data;
import java.util.Map;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;


import javax.servlet.http.HttpSession;

import org.apache.struts2.ServletActionContext;





import com.opensymphony.xwork2.ActionContext;
/*
 * 数据操作
 */
import com.opensymphony.xwork2.ActionSupport;

public class DataAction1 extends ActionSupport {
	@Override
	public String execute() throws Exception {
		// TODO Auto-generated method stub
	
		/*
		 * 解耦的方式实现对数据的操作
		 */
		ActionContext ac=ActionContext.getContext();
		//得到struts对HttpServletRequest对象进行封装为一个Map对象
		//拿到表示request对象的Map
		Map<String ,Object> request=ac.getContextMap();
		//拿到表示session对象的map
		Map<String , Object> session=ac.getSession();
		//拿到表示ServletContext对象的Map
		Map<String, Object> application=ac.getApplication();
		
		request.put("request_data", "request_data_ActionContext");
		request.put("session_data", "session_data_ActionContext");
		request.put("application_data", "application_data_ActionContext");
		return SUCCESS;
	}
}

package com.data;
import java.util.Map;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;


import javax.servlet.http.HttpSession;

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

import com.opensymphony.xwork2.ActionContext;
/*
 * 数据操作
 */
import com.opensymphony.xwork2.ActionSupport;
/*
 * 方式三：实现接口的方式
 */
public class DataAction2 extends ActionSupport implements RequestAware,SessionAware,ApplicationAware {
	private Map<String, Object> request;
	private Map<String, Object> session;
	private Map<String, Object> application;
	
	
	//在struts运行的时候会把代表application的map注入
	@Override
	public void setApplication(Map<String, Object> arg0) {
		// TODO Auto-generated method stub
		this.application=arg0;
	}
	//在struts运行的时候会把代表session的map注入
	@Override
	public void setSession(Map<String, Object> arg0) {
		// TODO Auto-generated method stub
		this.session=arg0;
	}
	//在struts运行的时候会把代表request的map注入
	@Override
	public void setRequest(Map<String, Object> arg0) {
		// TODO Auto-generated method stub
		this.request=arg0;
	}
	
	@Override
	public String execute() throws Exception {
		// TODO Auto-generated method stub
		//数据
		request.put("request_data", "request_data_Aware");
		request.put("session_data", "session_data_Aware");
		request.put("application_data", "application_data_Aware");
		return SUCCESS;
	}

	
}