课上时候，完成了测试中前边的登录注册的代码，实现了登陆时的各种验证，通过数据库存储账户信息，进行判断
注册界面应用了简单的增删改查，主界面套用老师给的HTML代码。
课下完成了界面的跳转，但是要求中的表格没有完成，之后还要继续学习。
package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.*;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import util.DBUtil;
/**
* Servlet implementation class dengluServlet
*/
@WebServlet("/dengluServlet")
public class dengluServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public dengluServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
String username=(String)request.getParameter("user");
String pwd=(String)request.getParameter("pwd");
String randcode=(String)request.getParameter("randcode");
String sql="select * from user where user=‘"+username+"‘";//定义一个查询语句
Connection conn = DBUtil.getConnection();
Statement state = null;
ResultSet rs = null;
try {
state = conn.createStatement();
rs = state.executeQuery(sql);
if(rs.next()) {
System.out.println("账号存在");
if(!pwd.equals(rs.getObject("pwd"))) {
PrintWriter out = response.getWriter();
out.print("<script>alert(‘密码错误，请重新输入!‘);window.location.href=‘login.html‘</script>");}
else {
System.out.println("密码正确");
PrintWriter out = response.getWriter();
out.print("<script>window.location.href=‘main.html‘</script>");
}
}
else
{
System.out.println("账号不存在");
PrintWriter out = response.getWriter();
out.print("<script>alert(‘账户不存在!‘);window.location.href=‘login.html‘</script>");
}
rs.close();
}catch(SQLException e) {
e.printStackTrace();
}
finally {
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
}
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Insert title here</title>
</head>
<body>
<form action ="AddServlet" method ="post" onsubmit="check(this)">
<table align="center">
<tr>
<td>
<h2>注册账户</h2>
</td>
</tr>
</table>
<table align="center" width="300">
<tr>
<td >用户姓名</td>
<td><input type ="text" name ="user"></td>
</tr>
<tr>
<td >密码</td>
<td><input type ="password" name ="pwd"></td>
</tr>
<tr>
<td >重复密码</td>
<td><input type ="password" name ="pwd2"></td>
</tr>
<tr>
<td >手机号码</td>
<td><input type ="text" name ="num"></td>
</tr>
<tr>
<td >所属单位</td>
<td><input type ="text" name ="danwei"></td>
</tr>
<tr>
<td align="center" colspan="2">
<input type="submit" value=" 注册 " />
</td>
</tr>
</table>
</form>
</body>
</html>
package servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import dao.UserDao;
import service.User;
/**
* Servlet implementation class AddServlet
*/
@WebServlet("/AddServlet")
public class AddServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public AddServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
request.setCharacterEncoding("utf-8");
response.setContentType("text/html;charset=utf-8");
doGet(request, response);
String user1 = request.getParameter("user");
String pwd = request.getParameter("pwd");
String pwd2=request.getParameter("pwd2");
String num=request.getParameter("num");
if(!pwd.equals(pwd2)) {
PrintWriter out = response.getWriter();
out.print("<script>alert(‘两次密码不一致‘);window.location.href=‘zhuce.jsp‘</script>");
}else if(num.length()!=11) {
PrintWriter out = response.getWriter();
out.print("<script>alert(‘电话长度错误‘);window.location.href=‘zhuce.jsp‘</script>");
}else {
User user = new User();
user.setUser(user1);
user.setPwd(pwd);
UserDao user2 = new UserDao();
user2.add(user);
PrintWriter out = response.getWriter();
out.print("<script>alert(‘注册成功‘);window.location.href=‘zhuce.jsp‘</script>");
}
}
}
原文地址：https://www.cnblogs.com/lixv2018/p/10467096.html
时间： 2024-10-12 07:28:13