jsp第十周
作者：互联网
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>
标签：ps,sname,java,第十,pwd,jsp,sql,public 来源： https://www.cnblogs.com/3468607405jin/p/16242043.html