【SpringBoot】实战-开发接口-用户-注册-EW帮帮网

注册

界面

接口文档

总体思路

代码编写

1.实体类

通过查看接口文档，我们可以看出响应数据都有都包含code，message，data三个属性，所以建立result实体类

package com.zwh.bojo;


import lombok.AllArgsConstructor;
import lombok.NoArgsConstructor;

//统一响应结果
@NoArgsConstructor//创建没有参数的构造函数
@AllArgsConstructor//创建全参数的构造函数
public class Result<T> {
    private Integer code;//业务状态码  0-成功  1-失败
    private String message;//提示信息
    private T data;//响应数据 泛型
    
    //快速返回操作成功响应结果(带响应数据)
    public static <E> Result<E> success(E data) {

        return new Result<>(0, "操作成功", data);
    }

    //快速返回操作成功响应结果
    public static Result success() {

        return new Result(0, "操作成功", null);
    }

    public static Result error(String message) {

        return new Result(1, message, null);
    }
}

2.Controller（控制器）类

package com.zwh.controller;

import com.zwh.bojo.Result;
import com.zwh.bojo.User;
import com.zwh.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/user")
public class UserController {
    @Autowired
    private UserService userService;
    @PostMapping("/register")
    public Result register(String username, String password) {
        //查询用户
        User user = userService.findByUsername(username);
        //注册
        if (user == null) {
            userService.register(username, password);
            return Result.success();
        }else {
            return Result.error("注册失败：用户名已经被占用");
        }
    }
}

3.Service接口类

package com.zwh.service;

import com.zwh.bojo.User;

public interface UserService {
    public User findByUsername(String username);
    public void register(String username, String password);
}

4.Impl接口实现

package com.zwh.service.impl;

import com.zwh.bojo.User;
import com.zwh.mapper.UserMapper;
import com.zwh.service.UserService;
import com.zwh.utils.Md5Util;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class UserServiceImpl implements UserService {
    @Autowired
    private UserMapper userMapper;
    //根据用户名查询对象
    @Override
    public User findByUsername(String username) {
        User user = userMapper.findByUsername(username);
        return user;
    }

    @Override
    public void register(String username, String password) {
        //加密
        String passwordMd5 = Md5Util.getMD5String(password);
        //添加
        userMapper.register(username,passwordMd5);
    }
}

5.Mapper类

package com.zwh.mapper;

import com.zwh.bojo.User;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Select;

@Mapper
public interface UserMapper {
    @Select("select * from public.user where username = #{username}")
    User findByUsername(String username);
    @Insert("insert into public.user(username,password,create_time,update_time) values(#{username},#{password},now(),now())" )
    void register(String username, String password);
}

6.工具类

package com.zwh.utils;


import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Md5Util {
    /**
     * 默认的密码字符串组合，用来将字节转换成 16 进制表示的字符,apache校验下载的文件的正确性用的就是默认的这个组合
     */
    protected static char hexDigits[] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};

    protected static MessageDigest messagedigest = null;

    static {
        try {
            messagedigest = MessageDigest.getInstance("MD5");
        } catch (NoSuchAlgorithmException nsaex) {
            System.err.println(Md5Util.class.getName() + "初始化失败，MessageDigest不支持MD5Util。");
            nsaex.printStackTrace();
        }
    }

    /**
     * 生成字符串的md5校验值
     *
     * @param s
     * @return
     */
    public static String getMD5String(String s) {
        return getMD5String(s.getBytes());
    }

    /**
     * 判断字符串的md5校验码是否与一个已知的md5码相匹配
     *
     * @param password  要校验的字符串
     * @param md5PwdStr 已知的md5校验码
     * @return
     */
    public static boolean checkPassword(String password, String md5PwdStr) {
        String s = getMD5String(password);
        return s.equals(md5PwdStr);
    }


    public static String getMD5String(byte[] bytes) {
        messagedigest.update(bytes);
        return bufferToHex(messagedigest.digest());
    }

    private static String bufferToHex(byte bytes[]) {
        return bufferToHex(bytes, 0, bytes.length);
    }

    private static String bufferToHex(byte bytes[], int m, int n) {
        StringBuffer stringbuffer = new StringBuffer(2 * n);
        int k = m + n;
        for (int l = m; l < k; l++) {
            appendHexPair(bytes[l], stringbuffer);
        }
        return stringbuffer.toString();
    }

    private static void appendHexPair(byte bt, StringBuffer stringbuffer) {
        char c0 = hexDigits[(bt & 0xf0) >> 4];// 取字节中高 4 位的数字转换, >>>
        // 为逻辑右移，将符号位一起右移,此处未发现两种符号有何不同
        char c1 = hexDigits[bt & 0xf];// 取字节中低 4 位的数字转换
        stringbuffer.append(c0);
        stringbuffer.append(c1);
    }

}