Servlet和JDBC开发学生信息管理

其他 2021-12-11 21:06:38 阅读次数: 0

login

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
          <center>
             <a href="user_Add.html" target="right">注册</a>
              <form action="login" method="post">
                  <table border="2">
                      <tr>
                          <td>登录名</td>
                          <td><input type="text" name="userName"/></td>
                      </tr>
                      <tr>
                          <td>密码</td>
                          <td><input type="password" name="password"/></td>
                      </tr>
                      <tr>
                          <td><input type="submit" value="登录"/></td>
                          <td><input type="reset" /></td>
                      </tr>
                  </table>

              </form>
          </center>
</body>
</html>

login_error

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<center>
    <font style="color:red;font-size: 30px">登录信息不存在,请重新登录</font>
    <br>
    <a href="user_Add.html" target="right">注册</a>
    <form action="login" method="post">
        <table border="2">
            <tr>
                <td>登录名</td>
                <td><input type="text" name="userName"/></td>
            </tr>
            <tr>
                <td>密码</td>
                <td><input type="password" name="password"/></td>
            </tr>
            <tr>
                <td><input type="submit" value="登录"/></td>
                <td><input type="reset" /></td>
            </tr>
        </table>

    </form>
</center>
</body>
</html>

left

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <ul>
        <li>用户信息管理
             <ol>
                 <li><a href="user_Add.html" target="right">用户信息注册</a></li>
                 <li><a href="/user/find" target="right">用户信息查询</a></li>
             </ol>
        </li>
        <li>试题信息管理</li>
        <li>考试管理</li>
    </ul>
</body>
</html>

index


<html >
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<frameset rows="15%,85%">
    <frame name="top" src="top.html"/>
    <frameset cols="15%,85%">
        <frame name="left" src="left.html"/>
        <frame name="right" src="login.html">
    </frameset>
</frameset>
</html>

top

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body style="background-color: green">
         <center>
             <font style="color:red;font-size:45px">在线考试管理系统</font>
         </center>
</body>
</html>

user_Add

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
         <center>
             <form action="/user/add" method="get">
                 <table border="2">
                     <tr>
                         <td>用户姓名</td>
                         <td><input type="text" name="userName"/></td>
                     </tr>
                     <tr>
                         <td>用户密码</td>
                         <td><input type="password" name="password"/></td>
                     </tr>
                     <tr>
                         <td>用户性别</td>
                         <td>
                               <input type="radio" name="sex" value="男"/>男
                               <input type="radio" name="sex" value="女"/>女
                         </td>
                     </tr>
                     <tr>
                         <td>用户邮箱</td>
                         <td><input type="text" name="email"/></td>
                     </tr>
                     <tr>
                         <td><input type="submit" value="用户注册"/></td>
                         <td><input type="reset" /></td>
                     </tr>
                 </table>
             </form>


         </center>
</body>
</html>

Servlet开发

LoginServlet


import com.bjpowernode.dao.UserDao;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;


import java.io.IOException;

public class LoginServlet extends HttpServlet {
    
    
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    
           String userName,password;
        UserDao dao = new UserDao();
        int result =0;
          //1.调用请求对象对请求体使用utf-8字符集进行重新编辑
           request.setCharacterEncoding("utf-8");
          //2.调用请求对象读取请求体参数信息
           userName = request.getParameter("userName");
           password = request.getParameter("password");
          //3.调用Dao将查询验证信息推送到数据库服务器上
           result = dao.login(userName, password);
          //4.调用响应对象，根据验证结果将不同资源文件地址写入到响应头，交给浏览器
           if(result ==1){
    
    //用户存在
               response.sendRedirect("index.html");
           }else{
    
    
               response.sendRedirect("login_error.html");
           }

    }


}

UserAddServlet


import com.bjpowernode.dao.UserDao;
import com.bjpowernode.entity.Users;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;


import java.io.IOException;
import java.io.PrintWriter;

public class UserAddServlet extends HttpServlet {
    
    


    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    
          String userName,password,sex,email;
          UserDao dao = new UserDao();
          Users user = null;
          int result = 0;
          PrintWriter out = null;
          //1.【调用请求对象】读取【请求头】参数信息，得到用户的信息信息
          userName = request.getParameter("userName");
          password = request.getParameter("password");
          sex = request.getParameter("sex");
          email = request.getParameter("email");

          //2.【调用UserDao】将用户信息填充到INSERT命令并借助JDBC规范发送到数据库服务器
          user = new Users(null, userName, password, sex, email);
          result =dao.add(user);
          //3.【调用响应对象】将【处理结果】以二进制形式写入到响应体
          response.setContentType("text/html;charset=utf-8");
          out = response.getWriter();
          if(result ==1){
    
    
              out.print("<font style='color:red;font-size:40'>用户信息注册成功</font>");
          }else{
    
    
              out.print("<font style='color:red;font-size:40'>用户信息注册失败</font>");
          }
    }
          //Tocmat负责销毁【请求对象】和【响应对象】
          //Tomcat负责将Http响应协议包推送到发起请求的浏览器上
          //浏览器根据响应头content-type指定编译器对响应体二进制内容编辑
          //浏览器将编辑后结果在窗口中展示给用户【结束】
}

UserDeleteServlet



import com.bjpowernode.dao.UserDao;

import com.bjpowernode.dao.UserDao;
import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

public class UserDeleteServlet extends HttpServlet {
    
    


    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    
         String userId;
         UserDao dao = new UserDao();
         int result = 0;
         PrintWriter out = null;
         //1.[调用请求对象]读取【请求头】参数（用户编号）
         userId = request.getParameter("userId");
         //2.[调用DAO]将用户编号填充到delete命令并发送到数据库服务器
         result = dao.delete(userId);
         //3.[调用响应对象]将处理结果以二进制写入到响应体，交给浏览器
         response.setContentType("text/html;charset=utf-8");
         out = response.getWriter();
         if(result == 1){
    
    
             out.print("<font style='color:red;font-size:40'>用户信息删除成功</font>");
         }else{
    
    
             out.print("<font style='color:red;font-size:40'>用户信息删除失败</font>");
         }
    }
}

UserFindServlet


import com.bjpowernode.dao.UserDao;
import com.bjpowernode.entity.Users;

import jakarta.servlet.ServletException;
import jakarta.servlet.http.HttpServlet;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;

public class UserFindServlet extends HttpServlet {
    
    


    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    
    
        UserDao dao = new UserDao();
        PrintWriter out;
        //1[调用DAO]将查询命令推送到数据库服务器上，得到所有用户信息【List】
        List<Users> userList = dao.findAll();
        //2[调用响应对象]将用户信息结合<table>标签命令以二进制形式写入到响应体
        response.setContentType("text/html;charset=utf-8");
        out = response.getWriter();
        out.print("<table border='2' align='center'>");
        out.print("<tr>");
        out.print("<td>用户编号</td>");
        out.print("<td>用户姓名</td>");
        out.print("<td>用户密码</td>");
        out.print("<td>用户性别</td>");
        out.print("<td>用户邮箱</td>");
        out.print("<td>操作</td>");
        out.print("</tr>");
        for (Users users : userList) {
    
    
            out.print("<tr>");
            out.print("<td>" + users.getUserId() + "</td>");
            out.print("<td>" + users.getUserName() + "</td>");
            out.print("<td>******</td>");
            out.print("<td>" + users.getSex() + "</td>");
            out.print("<td>" + users.getEmail() + "</td>");
            out.print("<td><a href='/user/delete?userId="+users.getUserId() +"'>删除用户</a></td>");
            out.print("</tr>");
        }
        out.print("</table>");
    }
}

UserDao


import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;


public class UserDao {
    
    

    static JdbcUtil util = new JdbcUtil();
    //用户注册
    public int add(Users user){
    
    
        String sql ="insert into users(userName,password,sex,email)" +
                    " values(?,?,?,?)";
        PreparedStatement ps = util.createStatement(sql);
        int result = 0;
        try {
    
    
            ps.setString(1, user.getUserName());
            ps.setString(2, user.getPassword());
            ps.setString(3, user.getSex());
            ps.setString(4, user.getEmail());
            result = ps.executeUpdate();
        } catch (SQLException e) {
    
    
            e.printStackTrace();
        } finally {
    
    
            util.close();
        }
        return result;
    }
    //查询所有用户信息
    public List findAll(){
    
    
        String sql ="select * from users";
        PreparedStatement ps = util.createStatement(sql);
        ResultSet rs = null;
        List userList = new ArrayList();
        try {
    
    
            rs = ps.executeQuery();
            while(rs.next()){
    
    
                Integer userId = rs.getInt("userId");
                String  userName =rs.getString("userName");
                String  password = rs.getString("password");
                String  sex = rs.getString("sex");
                String  email =rs.getString("email");
                Users users = new Users(userId, userName, password, sex, email);
                userList.add(users);
            }
        } catch (SQLException e) {
    
    
            e.printStackTrace();
        } finally {
    
    
            util.close(rs);
        }
        return userList;
    }
    //根据用户编号删除用户信息
    public int delete(String userId){
    
    
        String sql="delete from users where userId=?";
        PreparedStatement ps = util.createStatement(sql);
        int result = 0;
        try {
    
    
            ps.setInt(1, Integer.valueOf(userId));
            result = ps.executeUpdate();
        } catch (SQLException e) {
    
    
            e.printStackTrace();
        } finally {
    
    
            util.close();
        }
        return result;
    }
    //登录验证
    public int login(String userName,String password){
    
    
        String sql="select count(*) from users where userName=? and password=?";
        PreparedStatement ps = util.createStatement(sql);
        ResultSet rs = null;
        int result = 0;
        try {
    
    
            ps.setString(1, userName);
            ps.setString(2, password);
            rs = ps.executeQuery();
            while(rs.next()){
    
    
               result =  rs.getInt("count(*)");
            }
        } catch (SQLException e) {
    
    
            e.printStackTrace();
        } finally {
    
    
            util.close(rs);
        }
        return result;
    }
}

Users


public class Users {
    
    

       private Integer userId;
       private String  userName;
       private String  password;
       private String  sex;
       private String  email;

    public Integer getUserId() {
    
    
        return userId;
    }

    public void setUserId(Integer userId) {
    
    
        this.userId = userId;
    }

    public String getUserName() {
    
    
        return userName;
    }

    public void setUserName(String userName) {
    
    
        this.userName = userName;
    }

    public String getPassword() {
    
    
        return password;
    }

    public void setPassword(String password) {
    
    
        this.password = password;
    }

    public String getSex() {
    
    
        return sex;
    }

    public void setSex(String sex) {
    
    
        this.sex = sex;
    }

    public String getEmail() {
    
    
        return email;
    }

    public void setEmail(String email) {
    
    
        this.email = email;
    }

    public Users() {
    
    
    }

    public Users(Integer userId, String userName, String password, String sex, String email) {
    
    
        this.userId = userId;
        this.userName = userName;
        this.password = password;
        this.sex = sex;
        this.email = email;
    }
}

JdbcUtil

import java.sql.*;
public class JdbcUtil {
    
    

    final String URL="jdbc:mysql://localhost:3306/xq";
    final String USERNAME="root";
    final String PASSWORD="123";
     PreparedStatement ps= null;
     Connection con = null;
    //将jar包中driver实现类加载到JVM中
    static{
    
    
        try {
    
    
            Class.forName("com.mysql.cj.jdbc.Driver");
        } catch (ClassNotFoundException e) {
    
    
            e.printStackTrace();
        }
    }

    //封装连接通道创建细节
    public  Connection getCon(){
    
    

        try {
    
    
            con = DriverManager.getConnection(URL, USERNAME, PASSWORD);
        } catch (SQLException e) {
    
    
            e.printStackTrace();
        }
        return con;
    }

    //封装交通工具创建细节
    public  PreparedStatement createStatement(String sql){
    
    

        try {
    
    
            ps =  getCon().prepareStatement(sql);
        } catch (SQLException e) {
    
    
            e.printStackTrace();
        }
        return ps;
    }
    // ps与con销毁细节 insert,update,delete
    public  void close(){
    
    
        if(ps!=null){
    
    
            try {
    
    
                ps.close();
            } catch (SQLException e) {
    
    
                e.printStackTrace();
            }
        }

        if(con!=null){
    
    
            try {
    
    
                con.close();
            } catch (SQLException e) {
    
    
                e.printStackTrace();
            }
        }

    }

     //select ps,con,rs
    public  void close(ResultSet rs){
    
    
        if(rs!=null){
    
    
            try {
    
    
                rs.close();
            } catch (SQLException e) {
    
    
                e.printStackTrace();
            }
        }
        close();
    }
}

Web配置文件

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
    <servlet>
        <servlet-name>UserAddServlet</servlet-name>
        <servlet-class>com.bjpowernode.controller.UserAddServlet</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>UserFindServlet</servlet-name>
        <servlet-class>com.bjpowernode.controller.UserFindServlet</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>UserDeleteServlet</servlet-name>
        <servlet-class>com.bjpowernode.controller.UserDeleteServlet</servlet-class>
    </servlet>
    <servlet>
        <servlet-name>LoginServlet</servlet-name>
        <servlet-class>com.bjpowernode.controller.LoginServlet</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>LoginServlet</servlet-name>
        <url-pattern>/login</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>UserDeleteServlet</servlet-name>
        <url-pattern>/user/delete</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>UserFindServlet</servlet-name>
        <url-pattern>/user/find</url-pattern>
    </servlet-mapping>
    <servlet-mapping>
        <servlet-name>UserAddServlet</servlet-name>
        <url-pattern>/user/add</url-pattern>
    </servlet-mapping>
    <!--自定义启动页面-->
    <welcome-file-list>
        <welcome-file>login.html</welcome-file>
    </welcome-file-list>
</web-app>

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