處理數(shù)據(jù)的三個步驟

1.請求數(shù)據(jù)封裝
2.調(diào)用service處理業(yè)務(wù)邏輯，拿到結(jié)果數(shù)據(jù)
3.數(shù)據(jù)保存到域中

方式一 、通過ServletApi

 //直接拿到servletApi，執(zhí)行操作
        HttpServletRequest request = ServletActionContext.getRequest();
        HttpSession session = request.getSession();
        ServletContext servletContext = ServletActionContext.getServletContext();

        //保存
        request.setAttribute("request_data","request_data");
        session.setAttribute("session_data","session_data");
        servletContext.setAttribute("context_data","context_data");

方式二、 通過Action類

//推薦：解藕的方式實現(xiàn)對數(shù)據(jù)的操作
        ActionContext ac = ActionContext.getContext();
        //拿到struts對HttpServletRequest進行了封裝，封裝為一個map
        //拿到表示request對象map
        Map<String, Object> request = ac.getContextMap();
        //拿到表示Session對象map
        Map<String, Object> session = ac.getSession();
        //拿到表示servletContext對象map
        Map<String, Object> application = ac.getApplication();

        //數(shù)據(jù)
        request.put("request_data","request_data_request_data ");
        session.put("session_data","session_data_request_data ");
        application.put("context_data","context_data_request_data ");

方式三、實現(xiàn)接口的方法

package action;

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;

/**
 * 數(shù)據(jù)處理 方式三，實現(xiàn)接口的方法
 */
public class DataAction2 extends ActionSupport implements RequestAware, SessionAware, ApplicationAware {
    private Map<String, Object> request;
    private Map<String, Object> session;
    private Map<String, Object> application;

    //struts運行的時候，會把代表request的map對象注入
    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;
    }

    @Override
    public String execute() throws Exception {
        request.put("request_data","request_data_request_Aware ");
        session.put("session_data","session_data_request_Aware ");
        application.put("context_data","context_data_request_Aware ");
        return SUCCESS;
    }
}