spring - Spring 4 中的@PathVariable 验证

Question

如何在 Spring 验证我的路径变量。我想验证 id 字段，因为它唯一的单个字段我不想移动到 Pojo

@RestController
public class MyController {
    @RequestMapping(value = "/{id}", method = RequestMethod.PUT)
    public ResponseEntity method_name(@PathVariable String id) {
        /// Some code
    }
}

我尝试向路径变量添加验证，但仍然无法正常工作

    @RestController
    @Validated
public class MyController {
    @RequestMapping(value = "/{id}", method = RequestMethod.PUT)
    public ResponseEntity method_name(
            @Valid 
            @Nonnull  
            @Size(max = 2, min = 1, message = "name should have between 1 and 10 characters") 
            @PathVariable String id) {
    /// Some code
    }
}

Answer 1

你需要在你的 Spring 配置中创建一个 bean:

 @Bean
    public MethodValidationPostProcessor methodValidationPostProcessor() {
         return new MethodValidationPostProcessor();
    }

您应该在 Controller 上保留 @Validated 注释。

您需要在 MyController 类中使用 Exceptionhandler 来处理ConstraintViolationException:

@ExceptionHandler(value = { ConstraintViolationException.class })
    @ResponseStatus(value = HttpStatus.BAD_REQUEST)
    public String handleResourceNotFoundException(ConstraintViolationException e) {
         Set<ConstraintViolation<?>> violations = e.getConstraintViolations();
         StringBuilder strBuilder = new StringBuilder();
         for (ConstraintViolation<?> violation : violations ) {
              strBuilder.append(violation.getMessage() + "\n");
         }
         return strBuilder.toString();
    }

进行这些更改后，您应该会在验证成功时看到您的消息。

P.S.:我刚刚通过您的 @Size 验证进行了尝试。