Structs2中request session application 对数据处理的三种方式

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 package genius
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 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");
*
return SUCCESS;
}
}

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package genius
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 extends ActionSupport{
@Override
public String execute() throws Exception {
// 【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");
}
}*

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package genius;
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;
/**
* 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;
}
}