注册信息连接到数据库

本文链接： https://blog.csdn.net/qq_42177478/article/details/91354505

textservlet.java

import java.io.IOException;
import java.sql.SQLException;

@javax.servlet.annotation.WebServlet("/TestServlet")
public class TestServlet extends javax.servlet.http.HttpServlet {
    protected void doPost(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException {
        jdbc jdbc = new jdbc();
        String s = "aaa";
        try {
             s = jdbc.jdbc2();
        } catch (SQLException e) {
            e.printStackTrace();
        }

            response.getWriter().write(s);

    }

    protected void doGet(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response) throws javax.servlet.ServletException, IOException {
    doPost(request,response);
    }
}

zhuce.jsp

<%@ page import="java.sql.Connection" %>
<%@ page import="java.sql.DriverManager" %>
<%@ page import="java.sql.PreparedStatement" %><%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2019/5/30 0030
  Time: 下午 6:00
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
<%
    //1.注册
    String username = request.getParameter("username");
    String password = request.getParameter("password");
    //2.连接数据库
    Class.forName("com.mysql.jdbc.Driver");
    Connection con = DriverManager.getConnection("jdbc:mysql:///stuinfo","root","123456");
    String sql = "insert into stu values(?,?,?)";
    PreparedStatement st = con.prepareStatement(sql);
    st.setInt(1,4);
    st.setString(2,username);
    st.setString(3,password);
    st.executeUpdate();
    System.out.println("成功");

%>

</body>
</html>

index.jsp

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2019/5/29 0029
  Time: 上午 11:01
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <title>$Title$</title>
  </head>
  <form action = "zhuce.jsp" method="get" >
  <body>
  <from>
    <table>
<tr>
  <td>
    用户名
  </td>
  <td><input type = "text" name = "username"></td>
</tr>
      <tr>
        <td>密码</td>
        <td><input type = "password" name = "password"></td>
      </tr>
      <tr>
        <input type = "submit" value  ="注册">
      </tr>
    </table>
  </from>

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

jdbc.java

import com.mysql.jdbc.Driver;

import java.sql.*;

public class jdbc {
    public String jdbc2() throws SQLException {
        //1.注册驱动,加载到内存；
        DriverManager.registerDriver(new Driver());
        //

        //2.获取连接对象；
        Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/stuinfo","root","123456");
     // Connection con = DriverManager.getConnection("jdbc:mysql:///stuinfo","root","123456");
        //3.通过连接对象获取操作sql语句的statment对象
        Statement st = con.createStatement();
        //4.执行sql语句
        String sql = "select * from stuinfo";
        //String sql = "update stuinfo set age = 29 where id = 1 ";
        ResultSet rs = st.executeQuery(sql);
        //5.通过遍历获取表中每条记录
     //   while(rs.next()){

        rs.next();
        int id = rs.getInt("id");
        String name = rs.getString(1);
        int age = rs.getInt(3);

        System.out.println(id+"..."+name+"..."+age);
     //}
        return  id+"..."+name+"..."+age;
    }
}

jjbd.java

import java.sql.*;

public class jjdb {
    public static void main(String args[]){
        Connection con = null;
        Statement st = null;
        ResultSet rs = null;
        try {
            //使用反射；
            Class.forName("com.mysql.jdb.Driver");
            con =(Connection) DriverManager.getConnection("jdbc:mysql:///stuinfo","root","123456");
            st = con.createStatement();
            String sql = "select * from stuinfo";
            rs = st.executeQuery(sql);
            st = con.createStatement();
            while(rs.next()){

                int id = rs.getInt(1);
                String name = rs.getString(1);
                int age = rs.getInt(3);

                System.out.println(id+"..."+name+"..."+age);
            }

            } catch (SQLException e) {
                e.printStackTrace();


        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }finally {
            try {
                if(rs!=null)
                    rs.close();
            }catch (SQLException e){
                e.printStackTrace();
            }
            try{
                if(st!=null)
                    st.close();
            }catch(SQLException e)
            {
                e.printStackTrace();

            }
        }


    }
}

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注册信息连接到数据库

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