JSP第八次作业
数据库test 中建个表 stu(stuid 主键 自动增长 ，用户名，密码，年龄)
1.设计一个注册页面，实现用户注册功能2.设计一个登陆页面，实现用户名密码登陆3.两个页面可以互相超链接
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class BaseDao {
protected Connection getConnection() {
Connection conn = null;
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(
"jdbc:mysql://localhost:3306/test", "root", "123456");
} catch (Exception e) {
e.printStackTrace();
}
return conn;
}
protected void closeAll(Connection con,PreparedStatement ps,ResultSet rs){
try {
if(rs != null)
rs.close();
if(ps != null)
ps.close();
if(con != null)
con.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class StuDao extends BaseDao {
public boolean login(String name, int password) {
boolean f = false;
Connection conn = getConnection();
String sql = "select * from stu where name=? and password=?";
PreparedStatement ps = null;
ResultSet rs = null;
try {
ps = conn.prepareStatement(sql);
ps.setString(1, name);
ps.setInt(2, password);
rs = ps.executeQuery();
if (rs.next())
f = true;
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
closeAll(conn, ps, rs);
}
return f;
}
public void reg(String name, int password, int age) {
Connection conn = getConnection();
PreparedStatement ps = null;
try {
String sql = "insert into stu(name,password,age) values(?,?,?)";
// 4.执行SQL语句
ps = conn.prepareStatement(sql);
ps.setString(1, name);
ps.setInt(2, password);
ps.setInt(3, age);
ps.executeUpdate();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
closeAll(conn, ps, null);
}
}
}
<%--dao.jsp--%>
<%@ page import="Dao.StuDao"%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<%
String name = request.getParameter("name");
String passwords = request.getParameter("password");
String ages = request.getParameter("age");
int age = Integer.parseInt(ages);
int password = Integer.parseInt(passwords);
StuDao s1 = new StuDao();
s1.reg(name, password, age);
request.getRequestDispatcher("login.jsp").forward(request, response);
%>
</body>
</html>
<%--dologin.jsp--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h1>登录失败,3秒后返回登录界面</h1>
<%
response.setHeader("refresh", "3;url=login.jsp");
%>
</body>
</html>
<%--index.jsp--%>
<%@ page import="Dao.StuDao"%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<%
String name = request.getParameter("name");
String passwords = request.getParameter("password");
int password = Integer.parseInt(passwords);
StuDao s1 = new StuDao();
if (s1.login(name, password)) {
request.getRequestDispatcher("main.jsp").forward(request, response);
} else {
request.getRequestDispatcher("dologin.jsp").forward(request, response);
}
%>
</body>
</html>
<%--login.jsp--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<form action="index.jsp" method="post">
<b>用户名</b>
<input type="text" name="name" />
<br />
<b>密码</b>
<input type="text" name="password" />
<br />
<input type="submit" value="登录" />
<a href="register.jsp">注册</a>
</form>
</body>
</html>
<%--main.jsp--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h1>登录成功</h1>
</body>
</html>
<%--register.jsp--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<form action="dao.jsp" method="post">
<b>用户名</b>
<input type="text" name="name" />
<br />
<b>密码</b>
<input type="text" name="password" />
<br />
<b>年龄</b>
<input type="text" name="age"/>
<br />
<input type="submit" value="注册" />
<a href="login.jsp">登录</a>
</form>
</body>
</html>
