为了方便实体类操作,这里添加一下lombok的依赖,添加好以后右键重新加载maven
lombok注解含义大全:https://www.jianshu.com/p/41c4a226e955
<!--lombok依赖--> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> </dependency>
编写接口顺序
Controller(控制器) => Service(接口层) => impl(实现层) => Mapper(与数据库交互层)
写好Controller后可通过 alt+enter 创建 Service
同理可自动创建 impl 和 Mapper
@RestController @RequestMapping("/user") public class UserController { @Autowired private UserService userService; @RequestMapping("/register") public Result register(String username,String password) { //查重用户 User u = userService.findByUserName(username); if(u==null) { //没有占用,注册 userService.register(username,password); return Result.success(); } else { //用户名已被占用 return Result.error("用户名已被占用!"); } } }Controller
package com.example.bigevent.pojo; //统一响应结果 import lombok.AllArgsConstructor; import lombok.Data; import lombok.NoArgsConstructor; @NoArgsConstructor//无参构造 @AllArgsConstructor//全参构造 @Data//geter seter 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 //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); } }pojo Result返回实体
@Service public interface UserService { //根据用户名查询用户 User findByUserName(String username); //注册 void register(String username, String password); }Service
@Service public class UserServiceImpl implements UserService { @Autowired private UserMapper userMapper; @Override public User findByUserName(String username){ User u = userMapper.findByUserName(username); return u; } @Override public void register(String username, String password){ //加密 String md5password = Md5Util.getMD5String(password); //添加 userMapper.register(username,md5password); } }impl
package com.example.bigevent.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); } }utils下的md5工具类
@Mapper public interface UserMapper { @Select("select * from user where username=#{username}") User findByUserName(String username); @Insert("insert into user(username,password,create_time,update_time)" + " values (#{username},#{password},now(),now())") void register(String username, String password); }Mapper
运行:
此报错是因为springboot版本和mybatis冲突问题导致 将springboot版本改为3.1.5即可
标签:username,return,String,接口,static,springboot3,vue3,password,public From: https://www.cnblogs.com/JoeYD/p/18051376