spring - 抛出 javax.validation.ConstraintViolationException 时获取字段名称

Question

当 PathVariable 'name' 没有通过验证时，会抛出 javax.validation.ConstraintViolationException。有没有办法在抛出的 javax.validation.ConstraintViolationException 中检索参数名称？

@RestController
@Validated
public class HelloController {

@RequestMapping("/hi/{name}")
public String sayHi(@Size(max = 10, min = 3, message = "name should    have between 3 and 10 characters") @PathVariable("name") String name) {
  return "Hi " + name;
}

Answer 1

如果您检查 getPropertyPath() 的返回值，你会发现它是一个 Iterable<Node>迭代器的最后一个元素是字段名。以下代码适用于我:

// I only need the first violation
ConstraintViolation<?> violation = ex.getConstraintViolations().iterator().next();
// get the last node of the violation
String field = null;
for (Node node : violation.getPropertyPath()) {
    field = node.getName();
}