带有@PathVariable和@RequestParam的自定义验证器

@GetMapping("/users/{id}")
public String getUserById(@PathVariable("id") String userId) {
    // 处理业务逻辑
    return "用户ID：" + userId;
}

@GetMapping("/users")
public String getUser(@RequestParam("id") String userId, @RequestParam("name") String userName) {
    // 处理业务逻辑
    return "用户ID：" + userId + "，用户名：" + userName;
}

public class UserValidator implements Validator {
    
    @Override
    public boolean supports(Class<?> clazz) {
        return User.class.equals(clazz);
    }
    
    @Override
    public void validate(Object target, Errors errors) {
        ValidationUtils.rejectIfEmptyOrWhitespace(errors, "name", "user.name.empty", "用户名不能为空");
        ValidationUtils.rejectIfEmptyOrWhitespace(errors, "email", "user.email.empty", "邮箱不能为空");
        // 自定义其他验证逻辑
    }
}

@RestController
public class UserController {
    
    @Autowired
    private UserValidator userValidator;
    
    @InitBinder
    protected void initBinder(WebDataBinder binder) {
        binder.setValidator(userValidator);
    }
    
    @PostMapping("/users")
    public String createUser(@Validated @RequestBody User user, BindingResult result) {
        if (result.hasErrors()) {
            // 处理验证错误
            return "参数错误";
        }
        
        // 处理业务逻辑
        
        return "用户创建成功";
    }
}