标签：ps sname 第十 int pwd jsp sql public
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();
}
}
}
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;
}
}
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
+ "]";
}
}
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head>
</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>
<%@ 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>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head>
</head>
<%
%>
<body>
<form action="reg.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>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<html>
<head>
</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>
搜索
复制
------------恢复内容结束------------
标签：ps,sname,第十,int,pwd,jsp,sql,public 来源： https://www.cnblogs.com/qq2045049553/p/16244819.html
本站声明： 1. iCode9 技术分享网（下文简称本站）提供的所有内容，仅供技术学习、探讨和分享； 2. 关于本站的所有留言、评论、转载及引用，纯属内容发起人的个人观点，与本站观点和立场无关； 3. 关于本站的所有言论和文字，纯属内容发起人的个人观点，与本站观点和立场无关； 4. 本站文章均是网友提供，不完全保证技术分享内容的完整性、准确性、时效性、风险性和版权归属；如您发现该文章侵犯了您的权益，可联系我们第一时间进行删除； 5. 本站为非盈利性的个人网站，所有内容不会用来进行牟利，也不会利用任何形式的广告来间接获益，纯粹是为了广大技术爱好者提供技术内容和技术思想的分享性交流网站。