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

BaseDao.java

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 {

    // 获取连接
    public static Connection getConnection() {
        Connection conn = null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
            // 2.建立连接
            conn = DriverManager.getConnection(
                    "jdbc:mysql://localhost:3306/test", "root", "root");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return conn;
    }

    // 关闭连接
    public static 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();
        }
    }

}

stuDao.java

package dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class stuDao {

    public static void main(String[] args) {
        stuDao s=new stuDao();
        String sname="张三";
        int pwd=12;
        System.out.println(s.login(sname, pwd));
    }
    public student login(String sname, int pwd) {
        Connection conn = BaseDao.getConnection();
        student s=null;
        PreparedStatement ps = null;
        ResultSet rs = null;
        try {
            String sql = "select * from stu where sname=? and pwd=?";
            ps = conn.prepareStatement(sql);
            ps.setString(1, sname);
            ps.setInt(2, pwd);
            rs = ps.executeQuery();
            if (rs.next()) {
                s=new student();
                String name=rs.getString("sname");
                s.setSname(name);
                return s;
            }
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            BaseDao.closeAll(conn, ps, rs);
        }
        return s;
    }

    public int reg(String sname, int pwd, int age) {
        Connection conn = BaseDao.getConnection();
        PreparedStatement ps = null;
        int r = -1;
        try {
            String sql = "insert into stu(sname,pwd,age) values(?,?,?)"; // 2个占位符
            // 4.执行SQL语句
            ps = conn.prepareStatement(sql);
            ps.setString(1, sname);
            ps.setInt(2, pwd);
            ps.setInt(3, age);
            r = ps.executeUpdate();// 增删改都用这个
        } catch (SQLException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } finally {
            BaseDao.closeAll(conn, ps, null);
        }
        return r;

    }

}

student.java

package dao;

public class student {
    String sname;
    int pwd;
    int age;
    public String getSname() {
        return sname;
    }
    public void setSname(String sname) {
        this.sname = sname;
    }
    public int getPwd() {
        return pwd;
    }
    public void setPwd(int pwd) {
        this.pwd = pwd;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    @Override
    public String toString() {
        return "student [sname=" + sname + ", pwd=" + pwd + ", age=" + age
                + "]";
    }
    
}

student.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<html>
<head>

<title>My JSP 'student.jsp' starting page</title>

</head>
<%
    
%>
<body>
    <form action="slogin.jsp">
        学生姓名：<input type="text" name="sname" /> 账号密码：<input type="password"
            name="spwd" /> <input type="submit" value="登录" />
    </form>
    <form action="slogon.jsp">
        <input type="submit" value="注册" />
    </form>
</body>
</html>

slogin.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<html>
<head>

<title></title>

</head>
<%@ page import="dao.stuDao"%>
<%
    String name = request.getParameter("sname");
    String spwd = request.getParameter("spwd");
    String sname = new String(name.getBytes("ISO-8859-1"), "utf-8");
    try {
        int pwd = Integer.parseInt(spwd);
        stuDao studao = new stuDao();
        if (studao.login(sname, pwd) != null) {
            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=student.jsp");
        }
    } catch (Exception e) {
        out.println("异常！！");
        out.println("三秒后跳转到主页面...");
        response.setHeader("refresh", "3;url=student.jsp");
    }
%>
<body>
    <a href="student.jsp">返回</a>
</body>
</html>

slogon.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<html>
<head>

<title>My JSP 'slogon.jsp' starting page</title>

</head>
<%
    
%>
<body>
    <h3>请输入信息来完成注册...</h3>
    <form action="slogon_link.jsp">
        用户名：<input type="text" name="sname" /> 密码:<input type="password"
            name="spwd" /> 年龄:<input type="text" name="sage" /> <input
            type="submit" value="注册" />
    </form>
    <a href="student.jsp">返回</a>
</body>
</html>

slogon_link.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>

<html>
<head>

<title>My JSP 'slogon_link.jsp' starting page</title>

</head>
<%@ page import="dao.stuDao"%>
<%
    String sname = request.getParameter("sname");
    String spwd = request.getParameter("spwd");
    String sage = request.getParameter("sage");
    String name=new String(sname.getBytes("ISO-8859-1"),"utf-8");
    int pwd = Integer.parseInt(spwd);
    int age = Integer.parseInt(sage);
    stuDao s = new stuDao();
    if (s.reg(sname, pwd, age) != -1) {
        out.println("注册成功！");
        out.println("三秒后跳转到主页...");
        response.setHeader("refresh", "3;url=student.jsp");
    } else {
        out.println("注册失败！");
        out.println("三秒后跳转到主页...");
        response.setHeader("refresh", "3;url=student.jsp");
    }
%>
<body>
</body>
</html>

posted on 2022-05-04 11:35 Lwmm 阅读(87) 评论(0) 编辑收藏举报