覆盖DropWizard ConstraintViolation消息

Question

所以我想通过DropWizard资源更改用于验证模型的验证消息.

我正在使用java bean验证注释.例如,这是我要验证的字段之一:

@NotEmpty(message = "Password must not be empty.")

我可以使用验证器按预期测试它的工作原理.

但是,当我使用DropWizard对资源进行验证时,它会为该消息添加一些额外的内容.我看到的是这个 - password Password must not be empty. (was null)我发现这里的代码 - https://github.com/dropwizard/dropwizard/blob/master/dropwizard-validation/src/main/java/io/dropwizard/validation/ ConstraintViolations.java

具体这个方法 -

public static <T> String format(ConstraintViolation<T> v) {
    if (v.getConstraintDescriptor().getAnnotation() instanceof ValidationMethod) {
        final ImmutableList<Path.Node> nodes = ImmutableList.copyOf(v.getPropertyPath());
        final ImmutableList<Path.Node> usefulNodes = nodes.subList(0, nodes.size() - 1);
        final String msg = v.getMessage().startsWith(".") ? "%s%s" : "%s %s";
        return String.format(msg,
                             Joiner.on('.').join(usefulNodes),
                             v.getMessage()).trim();
    } else {
        return String.format("%s %s (was %s)",
                             v.getPropertyPath(),
                             v.getMessage(),
                             v.getInvalidValue());
    }
}

有什么办法可以覆盖这种行为吗？我只想显示我在注释中设置的消息...

Answer 1

这是dropwizard 0.8中的一个程序化解决方案:

public void run(final MyConfiguration config, final Environment env) {
    AbstractServerFactory sf = (AbstractServerFactory) config.getServerFactory();
    // disable all default exception mappers
    sf.setRegisterDefaultExceptionMappers(false);
    // register your own ConstraintViolationException mapper
    env.jersey().register(MyConstraintViolationExceptionMapper.class)
    // restore other default exception mappers
    env.jersey().register(new LoggingExceptionMapper<Throwable>() {});
    env.jersey().register(new JsonProcessingExceptionMapper());
    env.jersey().register(new EarlyEofExceptionMapper());
} 

我认为它比配置文件更可靠.正如您所看到的,它还支持所有其他默认异常映射器.

Answer 2

ConstraintViolationExceptionMapper是使用该方法的那个.要覆盖它,您需要取消注册它并注册您自己的ExceptionMapper.

删除异常映射器

Dropwizard 0.8

将以下内容添加到yaml文件中.请注意,它将删除dropwizard添加的所有默认异常映射器.

server:
    registerDefaultExceptionMappers: false

Dropwizard 0.7.x

environment.jersey().getResourceConfig().getSingletons().removeIf(singleton -> singleton instanceof ConstraintViolationExceptionMapper);

创建并添加自己的异常映射器

public class ConstraintViolationExceptionMapper implements ExceptionMapper<ConstraintViolationException> {

    @Override
    public Response toResponse(ConstraintViolationException exception) {
        // get the violation errors and return the response you want.
    }
}

并在您的应用程序类中添加您的异常映射器.

public void run(T configuration, Environment environment) throws Exception {
  environment.jersey().register(ConstraintViolationExceptionMapper.class);
}