在DropWizard或Jetty应用程序中导致404的日志URL

时间:2019-05-08 09:55:15

标签: java jax-rs jetty dropwizard

我们正在运行DropWizard并尝试删除导致引发404响应的URL记录

我们有一个接受NotFoundException的综合异常映射器。令人沮丧的是,该异常不包含导致该URL引发的URL的上下文。

此处为示例应用程序:https://github.com/pauldambra/not.found.example

我们正在使用ExceptionMapper

public class NotFoundLogger implements ExceptionMapper<NotFoundException> {

    ExampleLogger logger = new ExampleLogger();

    @Override
    public Response toResponse(final NotFoundException exception) {
        logger.error(urlFrom(exception), exception);
        return Response.status(404).build();
    }

    private String urlFrom(final NotFoundException exception) {
        return "why is this not a property on the exception?!";
    }

    private class ExampleLogger {
        void error(final String notFoundUrl, final NotFoundException exception) {
            System.out.println("someone tried to load " + notFoundUrl);
            System.out.println(exception.getMessage());
        }
    }
}

如果当有人请求应用程序不提供服务的URL时我们查看应用程序日志,我们会看到该应用程序可以记录其返回路径的404,但我们的自定义记录器无法访问该URL

someone tried to load why is this not a property on the exception?!
HTTP 404 Not Found
127.0.0.1 - - [08/May/2019:09:53:47 +0000] "GET /ping/pong HTTP/1.1" 404 

ExceptionMapper是这样做的错误方法吗?

1 个答案:

答案 0 :(得分:4)

结果有两种方法

一个人确实使用了异常映射器:

public class NotFoundLogger implements ExceptionMapper<NotFoundException> {

    // magically inject a thing
    // remember that magic is for evil wizards
    @Context
    private HttpServletRequest request;

    private ExampleLogger logger = new ExampleLogger();

    @Override
    public Response toResponse(final NotFoundException exception) {
        final StringBuffer absolutePath = HttpUtils.getRequestURL(request);
        logger.error("exception mapper: " + absolutePath, exception);
        return Response.status(404).build();
    }
}

这行得通,但不是很容易发现。

您还可以添加响应过滤器

public class NotFoundLoggingFilter implements ContainerResponseFilter {
    private ExampleLogger logger = new ExampleLogger();

    @Override
    public void filter(ContainerRequestContext requestContext,
                       ContainerResponseContext responseContext) {
        if (responseContext.getStatus() != 404) {
            return;
        }

        final URI absolutePath = requestContext.getUriInfo().getAbsolutePath();
        logger.error("filter: " + absolutePath, new NotFoundException());
    }
}

这不需要任何魔法,因此很适合我,但是您可以选择毒药。

真正的路径应该在NotFoundException上-如果我有更多时间,我建议更改代码以添加它。