第十周

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

package dao;

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", "root");
            } 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();
        }
    }
}
package dao;

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, String pwd) {
        boolean f = false;
        Connection conn = getConnection();
        String sql = "select * from stu where uname=? and upwd=?";
        PreparedStatement ps = null;
        ResultSet rs = null;
        try {
            ps = conn.prepareStatement(sql);
            ps.setString(1, name);
            ps.setString(2, pwd);
            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 int reg(String uname, String upwd, int uage) {
        Connection conn = getConnection();
        PreparedStatement ps = null;
        int i = -1;
        try {
            String sql = "insert into stu(uname,upwd,uage) values(?,?,?)";
            // 4.执行SQL语句
            ps = conn.prepareStatement(sql);
            ps.setString(1, uname);
            ps.setString(2, upwd);
            ps.setInt(3, uage);
            i = ps.executeUpdate();
            return i;
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            closeAll(conn, ps, null);
        }
        return i;

    }

}
<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
<form action="verification.jsp" method="post">
            <b>用户名</b>
            <input type="text" name="uname" />
            <br />
            <b>密码</b>
            <input type="text" name="upwd" />
            <br />
            <input type="submit" value="登录" />
            <a href="register.jsp">注册</a>
</form>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>

<form action="jump.jsp" method="post">
            <b>用户名</b>
            <input type="text" name="uname" />
            <br />
            <b>密码</b>
            <input type="text" name="upwd" />
            <br />
            <b>年龄</b>
            <input type="text" name="uage"/>
            <br />
            <input type="submit" value="注册" />
            <a href="login.jsp">登录</a>
        </form>
</body>
</html>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
    <%
        String name = request.getParameter("uname");
        String upwd = request.getParameter("upwd");
        String uages = request.getParameter("uage");
        String uname = new String(name.getBytes("ISO-8859-1"), "utf-8");
        int uage = Integer.parseInt(uages);
        StuDao s1 = new StuDao();
         if (s1.reg(uname, upwd, uages) != -1) {
        out.println("注册成功！");
        out.println("三秒后跳转到主页...");
        response.setHeader("refresh", "3;url=login.jsp");
    } else {
        out.println("注册失败！");
        out.println("三秒后跳转到主页...");
        response.setHeader("refresh", "3;url=login.jsp");
    }
    %>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<%@ page import="dao.StuDao"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Insert title here</title>
</head>
<body>
    <%
        String name = request.getParameter("uname");
        String upwd = request.getParameter("upwd");
        String uname = new String(name.getBytes("ISO-8859-1"), "utf-8");
        try {
            int pwd = Integer.parseInt(upwd);
            StuDao s = new StuDao();
            if (s.login(uname, upwd)) {
                out.println("登录成功！");
            } else {
                out.println("登陆失败！");
                out.println("三秒后跳转到主页面...");
                response.setHeader("refresh", "3;url=login.jsp");
            }
        } catch (Exception e) {
            out.println("异常！！");
            out.println("三秒后跳转到主页面...");
            response.setHeader("refresh", "3;url=login.jsp");
        }

    %>
    <a href="login.jsp">返回</a>
</body>
</html>

 

 

 

 

 

 

 

 

 

 

posted on 2022-05-07 14:33  我裂开  阅读(25)  评论(0)  编辑  收藏  举报

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