eclipse連接數(shù)據(jù)庫并實現(xiàn)用戶注冊登錄功能
文章目錄 MySQL配置環(huán)境變量navicat部署tomcat導(dǎo)入驅(qū)動修改代碼連接mysql數(shù)據(jù)庫運行:
MySQL配置環(huán)境變量
mysql肯定是必不可少的,這個就不用多說了,自己去官網(wǎng)下載就行我們來配置一下mysql的環(huán)境變量
步驟:
我的電腦右鍵——屬性——高級系統(tǒng)——環(huán)境變量
在系統(tǒng)變量下點擊新建:
變量名:MYSQL_HOME
變量值:C:\phpStudy\PHPTutorial\MySQL
這里的變量值填的是自己mysql所在的文件夾,以自己電腦路徑為準
然后找到path,點擊編輯,然后新建一個
%MYSQL_HOME%\bin
點擊確定(共三個)
測試
在windows命令行下輸入
mysql -u root -p
按下回車,輸入密碼即可進入數(shù)據(jù)庫
navicat
我自己電腦用的是phpstudy,感覺更方便一點,集成環(huán)境,并且有可視化工具,這里推薦使用navicat(有破解教程)
鏈接: https://pan.baidu.com/s/1dpNhsSUy_yAw-qi63toSzQ
提取碼: wumm
部署tomcat
我們點擊菜單欄windows>>preference>>在左邊欄找到server>>Runtime Environme
點擊add,添加tomcat
選擇需要的版本,點擊next,選擇自己安裝的tomcat路徑
點擊finish:
tomcat版本不要太高,不然可能會出現(xiàn)報錯;
新建一個web項目
其他選擇默認,next>>next>>next>>finish
將tomcat服務(wù)器顯示在控制臺上,以及將web應(yīng)用部署到tomcat中
1、window>>show view>>servers
2、點擊控制臺鏈接:No servers are available. Click ths link to create a new server.
3、在彈出的對話框中選擇tomcat版本
4、點擊next,添加我們的項目:選中我們的項目,點擊add,finish。
我們會在右邊菜單欄看到文件夾servers,里邊就是tomcat的一些相關(guān)文件
右鍵面板中的tomcat v8.0…點擊start,開啟服務(wù)器即可
導(dǎo)入驅(qū)動
導(dǎo)入的驅(qū)動一定不能過高,最好和自己電腦mysql版本一致
我電腦上的mysql是5.5.53,用的驅(qū)動是5.1.47,可用!
鏈接: https://pan.baidu.com/s/1senUiVzre2B7It-TIdjO5w
提取碼: 5ksf
下載好解壓,直接將jar包拖入lib中,右鍵build path一下
這樣就是導(dǎo)入成功!
修改代碼
找到我們創(chuàng)建的inc.jsp,修改下列代碼,以自己電腦為準,這個是和代碼相匹配的
另外,所有web文件都要放在WEB-INF下
連接mysql數(shù)據(jù)庫
連接名隨意,默認端口為3306
在數(shù)據(jù)庫中我們要創(chuàng)建一個數(shù)據(jù)庫庫名為demo,表名為users,
添加字段:username、password、email
這就相當于登陸的用戶名和密碼,可直接在數(shù)據(jù)庫中添加,也可通過注冊界面
填寫注冊信息,同樣會顯示在數(shù)據(jù)庫中
運行:
(1)login.jsp <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <%String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>" rel="external nofollow" rel="external nofollow" rel="external nofollow" > <title>My JSP 'login.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" > --> </head> <body> <form name="form1" action="login_action.jsp" method="post"> <table width="200" border="1"> <tr> <td colspan="2">登錄窗口</td> <tr> <td>用戶名</td> <td><input type="text" name="username" size="10"></td> </tr> <tr> <td>密碼</td> <td><input type="password" name="password" size="10"></td> </tr> <tr> <td colspan="2"><input type="submit" name="submit" value="登錄"> <a href="register.jsp" rel="external nofollow" >注冊新用戶</a></td> </tr> </table> </form> </body> </html> (2)login_action.jsp <%@ page pageEncoding="utf-8" %> <%@ include file="inc.jsp"%> <% //get parameters String username = request.getParameter("username"); String password = request.getParameter("password"); //check null if (username == null || password == null) { response.sendRedirect("login.jsp"); } //validate boolean isValid = false; String sql = "select * from users where username='"+username+"' and password='"+password+"'"; try { Class.forName(drv).newInstance(); Connection conn = DriverManager.getConnection(url, usr, pwd); Statement stm = conn.createStatement(); ResultSet rs = stm.executeQuery(sql); if(rs.next())isValid = true; rs.close(); stm.close(); conn.close(); } catch (Exception e) { e.printStackTrace(); out.println(e); } finally { } if (isValid) { session.setAttribute("username", username); response.sendRedirect("welcome.jsp"); } else { response.sendRedirect("login.jsp"); } %> (3)register.jsp <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <%String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>" rel="external nofollow" rel="external nofollow" rel="external nofollow" > <title>My JSP 'register.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" > --> </head> <body> <form name="form1" action="register_action.jsp" method="post"> <table width="200" border="1"> <tr> <td colspan="2">注冊窗口</td> <tr> <td>用戶名</td> <td><input type="text" name="username" size="10"></td> </tr> <tr> <td>密碼</td> <td><input type="password" name="password1" size="10"></td> </tr> <tr> <td>確認密碼</td> <td><input type="password" name="password2" size="10"></td> </tr> <tr> <td>Email</td> <td><input type="text" name="email" size="10"></td> </tr> <tr> <td colspan="2"><input type="submit" name="submit" value="注冊"> <a href="login.jsp" rel="external nofollow" >返回</a></td> </tr> </table> </form> </body> </html> (4)register_action.jsp <%@ page pageEncoding="utf-8" %> <%@ include file="inc.jsp"%> <% //get parameters String username = request.getParameter("username"); String password1 = request.getParameter("password1"); String password2 = request.getParameter("password2"); String email = request.getParameter("email"); //check null if (username == null || password1 == null || password2 == null || !password1.equals(password2)) { response.sendRedirect("register.jsp"); } //validate boolean isValid = false; String sql = "select * from users where username='"+username+"'"; try { Class.forName(drv).newInstance(); Connection conn = DriverManager.getConnection(url, usr, pwd); Statement stm = conn.createStatement(); ResultSet rs = stm.executeQuery(sql); if(!rs.next()) { sql = "insert into users(username,password,email) values('"+username+"','"+password1+"','"+email+"')"; stm.execute(sql); isValid = true; } rs.close(); stm.close(); conn.close(); } catch (Exception e) { e.printStackTrace(); out.println(e); } if (isValid) { response.sendRedirect("login.jsp"); } else { response.sendRedirect("register.jsp"); } %> (5)welcome.jsp <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <%String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>" rel="external nofollow" rel="external nofollow" rel="external nofollow" > <title>My JSP 'welcome.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css" rel="external nofollow" rel="external nofollow" rel="external nofollow" > --> <style type="text/css"> body{ background-color: beige; } </style> </head> <body> <table width="100%"> <tr> <td><img src="images/111.jpgA,LDYVS." height="90"></td> </tr> <tr> <td colspan="2"> <hr> </td> </tr> <tr> <td> <table> <tr> <td><a href="welcome.jsp" rel="external nofollow" >Main</a></td> </tr> <tr> <td><a href="menu1.jsp" rel="external nofollow" >Menu1</a></td> </tr> <tr> <td><a href="menu2.jsp" rel="external nofollow" >Menu2</a></td> </tr> <tr> <td><a href="menu3.jsp" rel="external nofollow" >Menu3</a></td> </tr> <tr> <td><a href="menu4.jsp" rel="external nofollow" >Menu4</a></td> </tr> <tr> <td><a href="menu5.jsp" rel="external nofollow" >Menu5</a></td> </tr> <tr> <td><a href="menu6.jsp" rel="external nofollow" >Menu6</a></td> </tr> <tr> <td><a href="menu7.jsp" rel="external nofollow" >Menu7</a></td> </tr> <tr> <td><a href="menu8.jsp" rel="external nofollow" >Menu8</a></td> </tr> </table> </td> <td> <form name="form1" action="logout.jsp" method="post"> <table width="200" border="1"> <tr> <td colspan="2">登錄成功</td> <tr> <td>歡迎你,</td> <td><%=(String) session.getAttribute("username")%></td> </tr> <tr> <td colspan="2"><input type="submit" name="submit" value="退出"></td> </tr> </table> </form> </td> </tr> </table> </body> </html> (6)logout.jsp <% session.removeAttribute("username"); response.sendRedirect("login.jsp"); %> (7)inc.jsp <%@ page import="java.sql.Connection"%> <%@ page import="java.sql.DriverManager"%> <%@ page import="java.sql.Statement"%> <%@ page import="java.sql.ResultSet"%> <%@ page import="java.sql.ResultSetMetaData"%> <% String drv = "com.microsoft.sqlserver.jdbc.SQLServerDriver"; String url = "jdbc:sqlserver://localhost:1433;DatabaseName=Demo"; String usr = "sa"; String pwd = ""; %>
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