JSP实现登录注册并链接数据库页面

在学习了页面跳转及部分知识后做了登录注册界面，并经过本博主调试bug后完善的更进一步，大家有什么问题也可以留言，本博主以更广泛学习讨论为目的。

内容介绍：实现页面的跳转；注册登录时实现读取数据库，并对数据库实现插入(insert)和查询(select)功能。

几点注意：sqljdbc.jar包的导入和环境变量；数据库的登录读取，可以参考数据库的测试。

登录注册界面的代码实现

index.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%>"><title>My JSP 'Feilong_index.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">--></head><body><center><font face = "宋体" size = "6" color = "#000">欢迎使用飞龙科技</font><hr><div><img alt="" width = "600" height = "400" src="D:\我的图片\QImages\小人团队.jpg"></div><table width = "200" border ="1" bordercolor = "#00F"><tr><td><input type = "button" value = "登      陆" onclick = "window.location.href('login.jsp')"></td><td><input type = "button" value = "注      册" onclick = "window.open('register.jsp')"></td></tr> </table></center></body>
</html>

login.jsp //登录界面

<%@ 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%>"><title>My JSP 'Feilong_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">--><body><center><font face="楷体" size="6" color="#000" >登录界面</font><%  String flag = request.getParameter("errNo");  try{if(flag!=null)out.println("用户名不存在或密码错误");}catch(Exception e){e.printStackTrace();}%><form action = "loginCh.jsp" method="post"><table width="300" height = "180" border="5" bordercolor="#A0A0A0"> <tr><th>账  户：</th><td><input type="text" name="name"  value = "请输入用户名" maxlength = "16" onfocus = "if(this.value == '请输入用户名') this.value =''"></td></tr><tr><th>密  码：</th><td><input type="password" name="pwd" maxlength = "20"></td></tr><tr><td colspan = "2" align = "center"><input type="submit" name="submit" value="登       录"><input type="button" value="返       回"οnclick="window.location.href('/webText')"></td></tr></table></form></center></body>
</html>

loginCh.jsp //登录检验

<%@ page language="java" import="java.util.*,java.sql.*,java.net.*" 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%>"><title>My JSP 'Feilong_loginCh.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">--></head><body><%      //接收用户名和密码  String user = new String(request.getParameter("name").getBytes("ISO-8859-1"),"UTF-8");  String pwd = request.getParameter("pwd");String driverClass = "com.microsoft.sqlserver.jdbc.SQLServerDriver";String url = "jdbc:sqlserver://localhost:1433; DatabaseName = db_01";String username = "sa";String password = "123";Class.forName(driverClass);//加载驱动 Connection conn = DriverManager.getConnection(url,username,password);//得到连接PreparedStatement pStmt = conn.prepareStatement("select * from tb_user where UName = '" + user + "' and Pwd = '" + pwd + "'");ResultSet rs = pStmt.executeQuery();if(rs.next()){response.sendRedirect("success.jsp?username="+URLEncoder.encode(user)); //解决乱码 }else{response.sendRedirect("login.jsp?errNo");//密码不对返回到登陆  }rs.close();pStmt.close();conn.close();%></body>
</html>

success.jsp //登录成功界面

<%@ 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%>"><title>Feilong_登录成功</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">--></head><body><center><%String name = new String(request.getParameter("username").getBytes("8859_1"));out.println("欢迎你:" + name);%><br><a href="login.jsp">重新登陆</a></center></body>
</html>

register.jsp //注册界面

<%@ 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%>"><title>My JSP 'Feilong_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">--><script>function addCheck(){var username=document.getElementById("username").value;var password=document.getElementById("password").value;var newword=document.getElementById("newword").value;if(username==""){alert("用户名不能为空!");document.getElementById("username").focus();  return false;}if(password==""){alert("密码不能为空!");document.getElementById("password").focus();return false;}if(password != newword){alert("两次输入密码不相同!");document.getElementById("newword").focus();return false;}}function validate(){var flag = addCheck();if(flag == false)return false;return true;}</script><body><center><font face="楷体" size="6" color="#000">注册界面</font><form action = "checkRegister.jsp" method = "post" onsubmit = "return validate()"><table width="300" height = "180" border="5" bordercolor="#A0A0A0"><tr><th>用户名：</th><td><input type="text" name="username" value="输入16个字符以内" maxlength = "16" onfocus = "if(this.value == '输入16个字符以内') this.value =''"></td></tr><tr><th>输入密码：</th><td><input type="text" name="password" value="输入20个字符以内" maxlength = "20" onfocus = "if(this.value == '输入20个字符以内') this.value =''"></td></tr><tr><th>确认密码：</th><td><input type="text" name="newword" value="重新输入密码" maxlength = "20" onfocus = "if(this.value == '重新输入密码') this.value =''"></td></tr><tr><td colspan = "2" align = "center"><input type="submit" value="注  册">    <input type="reset" value="重  置"></td></tr></table></form></center></body>
</html>

checkRegister.jsp //验证注册用户并导入数据库

<%@ page language="java" import="java.util.*,java.sql.*" 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%>"><title>My JSP 'Feilong_chechRegister.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">--></head><body><%      String user = new String(request.getParameter("username").getBytes("ISO-8859-1"),"UTF-8");  String pwd = request.getParameter("password");String driverClass = "com.microsoft.sqlserver.jdbc.SQLServerDriver";String url = "jdbc:sqlserver://localhost:1433; DatabaseName = db_01";String username = "sa";String password = "123";Class.forName(driverClass);//加载驱动 Connection conn = DriverManager.getConnection(url,username,password);//得到连接PreparedStatement pStmt = conn.prepareStatement("select * from tb_user where UName = '" + user + "'");ResultSet rs = pStmt.executeQuery();if(rs.next()){out.println("<script language='javascript'>alert('该用户已存在，请重新注册！');window.location.href='register.jsp';</script>");}else{PreparedStatement tmt = conn.prepareStatement("Insert into tb_user values('" + user + "','" + pwd + "')");int rst = tmt.executeUpdate();if (rst != 0){out.println("<script language='javascript'>alert('用户注册成功！');window.location.href='index.jsp';</script>");  }else{out.println("<script language='javascript'>alert('用户注册失败！');window.location.href='register.jsp';</script>");  }}%></body>
</html>

以上代码若有问题，首先执行下面数据库的测试代码：

执行下面代码前，首先在数据库中创建名为‘db_01’的数据库，在表中创建名为‘user’的表

login1.jsp

<%@ page language="java" import="java.util.*,java.sql.*" 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%>"><title>My JSP 'Feilong_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">--></head><body><%String driverClass = "com.microsoft.sqlserver.jdbc.SQLServerDriver";String url = "jdbc:sqlserver://localhost:1433; DatabaseName = db_01";String username = "sa";String password = "123";Class.forName(driverClass);//这步错可能是因为.jar包导入问题Connection conn = DriverManager.getConnection(url,username,password);//这步错可能是因为数据库属性安全中的名、密码不对或SQL的IP端口不是‘1433’PreparedStatement pStmt = conn.prepareStatement("select * from tb_user");ResultSet rs = pStmt.executeQuery();while(rs.next()){out.println("用户名： " + rs.getString(1) + " 密码： " + rs.getString(2));}rs.close();pStmt.close();conn.close();%></body>
</html>

小人团队.jpg

以上代码都是经过本博主细心敲打修改并实现的。转载请注明本博客的地址。

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