struts2数据处理的几种方式

package com.loaderman.c_data;

import java.util.Map;

import javax.servlet.ServletContext;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;

/**
 * 数据处理
 *
 */
public class DataAction_bak extends ActionSupport{

    @Override
    public String execute() throws Exception {

        // 1. 请求数据封装； 2. 调用Service处理业务逻辑，拿到结果数据

        // 3. 数据保存到域中

        /*
         *
        // Struts中对数据操作，方式1： 直接拿到ServletApi, 执行操作
        HttpServletRequest request = ServletActionContext.getRequest();
        HttpSession session = request.getSession();
        ServletContext application = ServletActionContext.getServletContext();
        // 操作
        request.setAttribute("request_data", "request_data1");
        session.setAttribute("session_data", "session_data1");
        application.setAttribute("application_data", "application_data1");
        */

        // 【推荐：解耦的方式实现对数据的操作】
        // Struts中对数据操作，方式2： 通过ActionContext类
        ActionContext ac = ActionContext.getContext();
        // 得到Struts对HttpServletRequest对象进行了封装，封装为一个map
        // 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();

        // 数据
        request.put("request_data", "request_data1_actionContext");
        session.put("session_data", "session_data1_actionContext");
        application.put("application_data", "application_data1_actionContext");

        return SUCCESS;
    }
}

package com.loaderman.c_data;

import com.opensymphony.xwork2.ActionSupport;
import org.apache.struts2.interceptor.ApplicationAware;
import org.apache.struts2.interceptor.RequestAware;
import org.apache.struts2.interceptor.SessionAware;
import java.util.Map;

/**
 * 数据处理, 方式3： 实现接口的方法
 */
public class DataAction extends ActionSupport implements RequestAware, SessionAware, ApplicationAware {

    private Map<String, Object> request;
    private Map<String, Object> session;
    private Map<String, Object> application;

    // struts运行时候，会把代表request的map对象注入
    @Override
    public void setRequest(Map<String, Object> request) {
        this.request = request;
    }
    // 注入session
    @Override
    public void setSession(Map<String, Object> session) {
        this.session = session;
    }
    // 注入application
    @Override
    public void setApplication(Map<String, Object> application) {
        this.application = application;
    }

    @Override
    public String execute() throws Exception {
        // 数据
        request.put("request_data", "request_data1_actionAware");
        session.put("session_data", "session_data1_actionAware");
        application.put("application_data", "application_data1_actionAware");        return SUCCESS;
    }

}