servlet+jsp实现简易登录+注册

servlet+jsp实现简易登录+注册

实现代码

数据库连接：

GetConnection.java

GetConnection.java
package util;

import com.mysql.jdbc.Connection;
import com.mysql.jdbc.PreparedStatement;
import javaBean.User;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;

public class GetConnection {
public static Connection getConn(){
Connection conn = null;
try{
//连接数据库
Class.forName("com.mysql.jdbc.Driver");
String url="jdbc:mysql://localhost:3306/mysql";
String user="root";
String password="root";
conn=(Connection) DriverManager.getConnection(url, user, password);
}catch(Exception e){
e.printStackTrace();
}
return conn;
}
}
}

登录页面
login.jsp 内容相关的部分代码

<form action="/AppiontmentSystem/P_LoginServlet" method="post" class="form">

<tr>
<td align="center">
<font color="white" face="微软雅黑">身 份 证 号 码：</font>
</td>
<td align="center"><input type="text" name="idc" id="idc" value="" style="padding:0 10px 0 10px; line-height:30px; width:400px; height:40px; border:none;"placeholder="   请 输 入 您 的 身 份 证 "></td>
</tr>
<tr>
<td align="center">
<font color="white" face="微软雅黑">密 码：</font>
</td>
<td align="center"><input type="password" name="password" id="password" value="" style="padding:0 10px 0 10px; line-height:30px; width:400px; height:40px; border:none;"placeholder="   请 输 入 您 的 密 码"></td>
</tr>
<tr>
<td colspan="2" align="center">
<input type="submit" value="登录" style="width:200px; height:40px; background:#e26398; color:white; border:none;">
</td>
</tr>

相关处理

P_LoginServlet.java

package servlet;

import java.io.IOException;
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 dao.UserDaoImpl;
import javaBean.User;

/**
* Servlet implementation class P_LoginServlet
*/
@WebServlet("/P_LoginServlet")
public class P_LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
* @see HttpServlet#HttpServlet()
*/
public P_LoginServlet() {
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
response.setContentType("text/html");
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
//获取用户登录输入的用户名以及密码
String idc = request.getParameter("idc");
String password = request.getParameter("password");
System.out.println(idc);
System.out.println(password);
//通过数据库验证用户名以及密码的正确性
UserDao user=new UserDaoImpl();
User userLogin = user.login(idc,password);
if(userLogin==null) {
System.out.println("数据库中不存在用户名密码!");
}
else {
System.out.println("idc:"+userLogin.getIdc()+"password"+userLogin.getPassword());
response.sendRedirect("Patient.jsp");
}
}

/**
* @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);
}

}

UserDao.java

package dao;

import javaBean.User;

public interface UserDao {
public User login(String idc,String password);
}

UserDaoImpl.java

package dao;

import java.sql.ResultSet;
import java.sql.SQLException;

import com.mysql.jdbc.Connection;
import com.mysql.jdbc.Statement;

import javaBean.User;
import util.GetConnection;

public class UserDaoImpl implements UserDao{
public User login(String idc,String password) {
Connection conn = null;
Statement stm = null;
try {
conn = new GetConnection().getConn();
stm = (Statement) conn.createStatement();
User user=new User(idc, password);
String sql="select * from p_user where idc='" + idc + "'";
ResultSet rs = stm.executeQuery(sql);
// 查看是否合法
while (rs.next()) {
if (idc.equals(rs.getString("idc"))&& password.equals(rs.getString("password")))
{
System.out.println("登录成功");
return user;
}
}
rs.close();
return null;
}catch (SQLException e) {
System.out.println("sql语句错误!");
}
return null;

}

}

web.xml相关部分

<servlet>
<servlet-name>P_LoginServlet</servlet-name>
<servlet-class>servlet.P_LoginServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>P_LoginServlet</servlet-name>
<url-pattern>/AppiontmentSystem/P_LoginServlet</url-pattern>
</servlet-mapping>