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Struts2+DAO层实现实例03——添加监听器跟踪用户行为
实例说明
根据上两次的成品进行二次加工。
加入Listener，监听用户的登陆注销情况。
所用知识说明
采用SessionBindingListener对Session进行监听。
同时，Action中获取Application，Session，request的方法（在此只列出一种）更多方法
public class LoginAction { private Map request; private Map session; private Map application; public String execute() { request = (Map)ActionContext.getContext().get("request"); session = ActionContext.getContext().getSession(); application = ActionContext.getContext().getApplication(); request.put("username1", "jingjing1"); session.put("username2", "jingjing2"); application.put("username3", "jingjing3"); return "success"; } }
代码实例
登陆控制UserManagment
package UserBlock;import com.opensymphony.xwork2.Action;import com.opensymphony.xwork2.ActionContext;import javafx.application.Application;import org.apache.struts2.views.util.ContextUtil;import javax.servlet.ServletContext;import javax.servlet.http.HttpSession;import javax.servlet.http.HttpSessionBindingEvent;import javax.servlet.http.HttpSessionBindingListener;import java.util.ArrayList;import java.util.Map;/** * Servlet监听器，控制记录用户的登陆注销信息 * Created by Richard on 2017/6/16. */public class UserManagment { class Userlistener implements HttpSessionBindingListener{ private String username; public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } @Override public void valueBound(HttpSessionBindingEvent httpSessionBindingEvent) { ActionContext context = ActionContext.getContext(); Map application = context.getApplication(); ArrayList online= (ArrayList) application.get("online"); if(online==null){ online=new ArrayList(); } online.add(username); application.put("online",online); } @Override public void valueUnbound(HttpSessionBindingEvent httpSessionBindingEvent) { ActionContext context = ActionContext.getContext(); Map application = context.getApplication(); ArrayList online= (ArrayList) application.get("online"); online.remove(username); } } /* 登陆 首先判别是否登陆 已经登陆---->return 没有登陆---->获取对应的Session，存入对应用户名的listener */ public void login(String username){ if(islogin(username)){ return; }else{ Userlistener newUser=new Userlistener(); newUser.setUsername(username); ActionContext actionContext=ActionContext.getContext(); Map session=actionContext.getSession(); session.put("username",newUser); } } /* 判断是否登陆： 判别条件Session中是否有对应的该用户名的Listener 有--->已经登陆，未注销 无--->没有登陆 */ public boolean islogin(String username){ ActionContext actionContext=ActionContext.getContext(); Map session=actionContext.getSession(); Userlistener judge= (Userlistener) session.get("username"); if(judge!=null){ return true; }else { return false; } } /* 注销 首先判断是否登陆 已经登陆--->移除Listener--->true 没有登陆--->false */ public boolean logoff(String username){ if(islogin(username)){ ActionContext actionContext=ActionContext.getContext(); Map session=actionContext.getSession(); session.remove(username); return true; }else { return false; } } /* 人数统计 返回Session中List的Size。 */ public int returnNum(){ ActionContext actionContext=ActionContext.getContext(); Map session=actionContext.getSession(); ArrayList online= (ArrayList) session.get("online"); if(online==null){ online=new ArrayList(); } return online.size(); } /* list返回 */ public ArrayList returnlist(){ ActionContext actionContext=ActionContext.getContext(); Map session=actionContext.getSession(); ArrayList online= (ArrayList) session.get("online"); if(online==null){ online=new ArrayList(); } return online; }}
主页in.jsp
<%-- Created by IntelliJ IDEA. User: Richard Date: 2017/6/16 Time: 21:38 To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %><%@ taglib prefix="s" uri="/struts-tags" %><html><head> <title>Welcome</title></head><body><h1>WelCome to My Struts Page</h1><hr>当前登录的用户:${param.username}<br><hr>当前所有登陆的用户：<table border=1 width=200> <s:iterator value="#application.online" var="user"> <tr <s:if test="#user.odd"> style="background-color: dimgray" </s:if> > <td><s:property value="#user.count"></s:property> </td> <td><s:property value="#user"></s:property></td> </tr> </s:iterator></table><a href="login.jsp">注销</a></body></html>
Action:
package UserBlock;import com.opensymphony.xwork2.ActionContext;import com.opensymphony.xwork2.ActionSupport;import java.util.ArrayList;import java.util.Map;import java.util.logging.LogManager;/** * Created by Richard on 2017/6/16. * 继承ActionSupport实现一个Action * 登陆界面通过loginuser.action调用login()方法来处理数据 * login()方法中通过ActionContext调用Session对象，存入输入错误的数据 * 通过addActionMessage()方法向页面输出相关信息 * 注册页面通过reguser.action调用reg()方法来处理数据 */public class UserAction extends ActionSupport { private String INDEX="index"; private String LOGIN="login"; private String REG="register"; private String username; private String password; private String compassword; private UserDao user; private UserManagment managment; public String getCompassword() { return compassword; } public void setCompassword(String compassword) { this.compassword = compassword; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public String login(){ try{ managment=new UserManagment(); user=new UserDao(); ArrayList result=user.up_select(username); if(result.size()>0){ User aim= (User) result.get(0); if(aim.getPassword().equals(password)){ /*登陆成功*/ managment.login(username); return INDEX; }else{ ActionContext applicton=ActionContext.getContext(); Map session=applicton.getSession(); int count; if(session.get("count")==null){ count=0; }else{ count= (int) session.get("count"); } if(count>=3){ addActionMessage("错误次数过多"); count=0; session.put("count",count); return LOGIN; }else{ count++; addActionMessage("您输入的用户名或密码错误"+count); session.put("count",count); return LOGIN; } } }else{ addActionMessage("该用户不存在，已经跳转到注册页面"); return REG; } }catch (Exception e){ addActionError(e.getMessage()); System.out.println(e.getMessage()); e.printStackTrace(); return LOGIN; } } public String reg(){ try{ managment=new UserManagment(); user=new UserDao(); ArrayList result=user.up_select(username); if(result.size()>0) { addActionMessage("该用户已经存在"); return REG; } else{ if(user.insert(username,password)){ managment.login(username); return INDEX; }else{ addActionMessage("发生未知错误，请重试！"); return REG; } } }catch (Exception e){ addActionError(e.getMessage()); return REG; } }}
Struts2+DAO层实现实例03——添加监听器跟踪用户行为
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