?? controller.java
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package com.controller;
import java.io.IOException;
import java.util.ArrayList;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import com.bean.UserInfoBean;
import com.bean.UserInfoDao;
/**
* 驗證用戶名在數據庫中是否存在
* @author Administrator
*
*/
public class Controller extends HttpServlet {
public ArrayList<UserInfoBean> al =new ArrayList<UserInfoBean> ();
public void doGet(HttpServletRequest request,HttpServletResponse response)
throws ServletException,IOException {
response.setContentType("text/html;charset=GBK");
/**
* 取得用戶名和密碼
*/
String UserName =request.getParameter("UserName");
String pwd =request.getParameter("pwd");
//封裝成對象
UserInfoBean uib = new UserInfoBean();
uib.setPwd(pwd);
uib.setUserName(UserName);
//驗證是否在數據庫中存在
UserInfoDao uid = new UserInfoDao();
boolean b =uid.YanZhen(uib);
String url ="UserPeopleView";
//
/**
* 根據不同的情況顯示不同的提示信息
* 如果為空 返回登錄界面 返回用戶名和密碼錯誤
*
* 如果是用戶已登錄 則提示用戶已 登錄
*/
if (!b) {
url ="denluView";
HttpSession session =request.getSession();
String str="你輸入的用戶名和密碼或密碼錯誤";
session.setAttribute("alter", str);
}else {
/**
* 保存登錄的用戶并轉到顯示頁ChatpaneView
*/
/**
* 如果用戶已登錄 則提示
*/
boolean flag =false;
ServletContext application1 =this.getServletContext();//獲取application
ArrayList<UserInfoBean> a2= (ArrayList)application1.getAttribute("al");
if (a2!=null) {
for (int i=0;i<a2.size();i++) {
if (a2.get(i).getUserName().equals(uib.getUserName())) {
System.out.println(a2.get(i).getUserName());
System.out.println(uib.getUserName());
flag =true;
url ="denluView";
HttpSession session2 =request.getSession();
String havedLogin="你已登錄,請另外選擇一個用戶登錄";
session2.setAttribute("havedLogin",havedLogin );
break;
}
}
}
if (!flag){
url="ChatPaneView";
al.add(uib);
// 將用戶列表存入application
ServletContext application =this.getServletContext();
application.setAttribute("al", al);
// 將當前用戶存起來
HttpSession session =request.getSession();
session.setAttribute("uib", uib);
}
}
//跳轉頁面
//轉發去顯示結果的servlet
RequestDispatcher dispatcher = request.getRequestDispatcher(url);//從指定的url得到一個請求傳發器對象
dispatcher.forward(request, response);//請求轉發
}
}
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