增加邮箱，用户名，密码验证

src/main/java/co/jp/app/common/ResultCode.java

@@ -28,7 +28,7 @@ public enum ResultCode {
     // 注册相关
     // USER_REGISTRATION_SUCCESS(3000, "用户注册成功"),
     USER_EMAIL_ALREADY_EXISTS(3001, "Email already exists"),
-    // USER_USERNAME_ALREADY_EXISTS(3002, "Username"),
+    USER_EMAIL_NOT_VALID(3002, "Email is not valid"),
     USER_PASSWORD_TOO_SHORT(3003, "password too short"),
     USER_PASSWORD_TOO_WEAK(3004, "password too weak"),
     USER_REGISTRATION_FAILED(3005, "User registration failed"),

src/main/java/co/jp/app/controller/UserController.java

@@ -24,7 +24,6 @@ import co.jp.app.service.UserService;
 import jakarta.validation.Valid;
 
 @RestController
-
 public class UserController {
 
     private final UserService userService;

src/main/java/co/jp/app/dto/LoginDto.java

@@ -1,9 +1,17 @@
 package co.jp.app.dto;
 
+import jakarta.validation.constraints.Email;
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Size;
+
 public class LoginDto {
 
+    @NotBlank(message = "邮箱不能为空")
+    @Email(message = "邮箱格式不正确，请输入有效的邮箱地址")
     private String email;
 
+    @NotBlank(message = "密码不能为空")
+    @Size(min = 6, max = 30, message = "密码长度必须在6到30位之间")
     private String password;
 
     public String getEmail() {

src/main/java/co/jp/app/dto/RegistrationDto.java

@@ -1,11 +1,26 @@
 package co.jp.app.dto;
 
+import jakarta.validation.constraints.Email;
+import jakarta.validation.constraints.NotBlank; // 或 javax.validation.constraints.NotBlank
+import jakarta.validation.constraints.Pattern;
+import jakarta.validation.constraints.Size;
+
 public class RegistrationDto {
 
+    //注：username可以为空
+    @Size(min = 2, max = 20, message = "用户名长度必须在2到20个字符之间")
+    @Pattern(
+            regexp = "^[a-zA-Z\\p{script=Han}]+$",
+            message = "用户名只能包含大小写英文字母和汉字，不能使用数字和标点符号"
+    )
     private String name;
 
+    @NotBlank(message = "邮箱不能为空")
+    @Email(message = "邮箱格式不正确，请输入有效的邮箱地址")
     private String email;
 
+    @NotBlank(message = "密码不能为空")
+    @Size(min = 6, max = 30, message = "密码长度必须在6到30位之间")
     private String password;
 
     public String getName() {

src/main/java/co/jp/app/service/UserService.java

@@ -34,15 +34,6 @@ public class UserService implements UserDetailsService {
 	@Transactional
 	public UserEntity registerNewUser(@NotNull RegistrationDto registrationDto) throws BusinessException {
 
-		if (userRepository.existsByEmail(registrationDto.getEmail())) {
-			throw new BusinessException(ResultCode.USER_EMAIL_ALREADY_EXISTS,"error: Email" + registrationDto.getEmail() + " had been used");
-		}
-
-		//密码最短6位限制
-		if (registrationDto.getPassword() == null || registrationDto.getPassword().length() < 6) {
-			throw new BusinessException(ResultCode.USER_PASSWORD_TOO_SHORT);
-		}
-
 		UserEntity newUser = new UserEntity();
 		newUser.setName(registrationDto.getName());
 		newUser.setEmail(registrationDto.getEmail());