jsp连接数据库实现注册登陆（超级详细）

要求
tomcat8.0、mysql
需要一个mysql的驱动器，放在WEB-INFO的lib。版本号如下：

数据库文件
在mysql数据库中建立一个名字叫db_01的数据库。在数据库的建立一个名字叫tb_user的表，表格的字段为UName,Pwd。

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</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JSP</font><hr><div><img alt="" width = "600" height = "400" src="D:\Images.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 = "登      陆" onclick = "window.open('login.jsp')"></td><td><input type = "button" value = "注      册" onclick = "window.open('register.jsp')"></td></tr> </table></center></body>
</html>

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%>"><title>My JSP</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""window.location.href('/webText')"></td></tr></table></form></center></body>
</html>

checkRegister.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</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.mysql.jdbc.Driver";String url = "jdbc:mysql://localhost:3306/db_01";String username = "root";String password = "root";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>

loginCh.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</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.mysql.jdbc.Driver";String url = "jdbc:mysql://localhost:3306/db_01";String username = "root";String password = "root";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>

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%>"><title>My JSP</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>

success.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>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>

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