SpringBoot中使用MySQL存用户信息

UserController类

package com.tedu.secboot.controller;
import com.tarena.mnmp.api.SendParam;
import com.tedu.secboot.entity.User;
import com.tedu.secboot.util.DBUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.client.RestTemplate;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Random;

@Controller
public class UserController {
    private static Logger logger = LoggerFactory.getLogger(UserController.class);//导入日志

    @RequestMapping("/regUser")    
    /*之前写法
    public void reg(HttpServletRequest request, HttpServletResponse response){
        System.out.println("开始处理注册");
        String username = request.getParameter("username");
        String password = request.getParameter("password");
        String nickname = request.getParameter("nickname");
        String ageStr = request.getParameter("age");
        int age = Integer.parseInt(ageStr);
        System.out.println(username+","+password+","+nickname+","+age);
    }*/

    /**
     * SpringMVC框架会根据先通过User的无参构造器实例化User
     * 并利用User对象的属性名去request中获取同名参数并利用User对象上对应属性的set方法将值设置到该属性上。
     *
     * 因此如果以自己定义的一个对象作为参数时，该对象的类要满足:
     * 1:属性名与浏览器传递过来的参数名一致
     * 2:类要有无参公开的构造器
     * 3:属性有set方法
     * 注:只要类设计符合JAVA_BEAN设计规范就可以。
     */
//    public void reg(User user,HttpServletResponse response){
//        System.out.println(user);
//    }

    //方法上的参数名要与原request.getParameter()方法传入的字符串内容一致(相当于与表单输入框名字一致)
    public void reg(String username,String password,String nickname,int age,String phone, HttpServletResponse response){
      //日志
        logger.debug("开始处理注册");//debug级别一般记录的是用于跟踪程序执行流程
        logger.info(username+","+password+","+nickname+","+age+","+phone);//info通常记录程序所用到的数据，当我们获取用户信息时可通过info记录
        //必要验证工作
        if(username==null||username.isEmpty()||password==null||password.isEmpty()||
                nickname==null||nickname.isEmpty()||phone==null||phone.isEmpty()||
                !phone.matches("[0-9]{11}")){
            //warn用于记录警告内容。例如:正常注册前端验证后通常不会进到这个if里，进来这里说明用户绕过了前端验证，这里要警告程序员。
            logger.warn("注册信息验证错误:"+username+","+password+","+nickname+","+age+","+phone);
            //要求浏览器查看错误提示页面
            try {
                response.sendRedirect("/reg_info_error.html");
            } catch (IOException e) {
                e.printStackTrace();
                //error用于记录程序实际出现的错误。
                logger.error(e.getMessage(),e);
            }
            return;
        }
        //2
        /*
            将该注册用户插入到数据库userinfo表中。
            插入成功后，响应注册成功页面
         */
        try (
                Connection conn = DBUtil.getConnection();
        ){
            String sql1 = "SELECT username FROM userinfo WHERE username=?";
            PreparedStatement ps = conn.prepareStatement(sql1);
            ps.setString(1,username);
            ResultSet rs = ps.executeQuery();
            if(rs.next()){//结果集若存在记录，该用户已存在。
                response.sendRedirect("/have_user.html");
                return;
            }

            String sql2 = "INSERT INTO userinfo(username,password,nickname,age) " +
                    "VALUES (?,?,?,?)";
            ps = conn.prepareStatement(sql2);
            ps.setString(1,username);
            ps.setString(2,password);
            ps.setString(3,nickname);
            ps.setInt(4,age);
            int sum = ps.executeUpdate();
            if(sum>0){
                response.sendRedirect("/reg_success.html");
                //发送短信
                String code = randomCode();//生成验证码
                System.out.println("验证码:"+code);
                //创建发送参数对象
                SendParam param = new SendParam.DefaultSendParam().defaultSendParam(code,phone);
                //借助Spring提供的RestTemplate
                new RestTemplate().postForObject(
                        "http://124.71.224.210:8082/send/sms",
                        param,
                        String.class
                );//向消息中台发送一个HTTP请求
            }
        } catch (SQLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private String randomCode(){
        Random random = new Random();
        StringBuilder builder = new StringBuilder(random.nextInt(1000000)+"");
        for(int i=builder.length();i<6;i++){//随机生成的验证码不足6位时前面补充若干个0达到6位
            builder.insert(0,"0");
        }
        return builder.toString();
    }

}

User

package com.tedu.secboot.entity;

/**
 * 该类的每一个实例用于表示一个注册用户信息
 */
public class User {
    private int id;
    private String username;
    private String password;
    private String nickname;
    private int age;

    public User(){}

    public User(int id, String username, String password, String nickname, int age) {
        this.id = id;
        this.username = username;
        this.password = password;
        this.nickname = nickname;
        this.age = age;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    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 getNickname() {
        return nickname;
    }

    public void setNickname(String nickname) {
        this.nickname = nickname;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    @Override
    public String toString() {
        return "User{" +
                "id=" + id +
                ", username='" + username + '\'' +
                ", password='" + password + '\'' +
                ", nickname='" + nickname + '\'' +
                ", age=" + age +
                '}';
    }
}