Groovy解析JSON与XML

Question

使用groovy，你会期望在读取和查询JSON与XML的速度和内存开销方面有更好的性能吗？

Answer 1

JSON is smaller and simpler than XML. I'd bet that JSON is faster to parse.

YAML would be faster still.

Answer 2

如果速度确实是一个问题，我宁愿使用java库来解析我想要的东西，而不是依赖于Groovy的实现。

Answer 3

If it's the same schema and the same information the memory usage will be nearly the same. Performance should be negligible between the two.

Answer 4

I believe the performance difference would be undetectable to anything other than a profiler if the schema and data is the same. That said you could see a big difference if you used the wrong XML parser. In other words a SAX implementation could easily match or possibly outperform the JSON parsing. There are a lot of external factors to cinsider. If you want the true story throw both a JSON and a SAX parser at the same data/schema with no additional logic. The big savings come from the logic used to interpret the parse. It may be simpler to use a DOM or a pull parser depending on your reqs while SAx would cause an overly complicated non-performant solution. Also there are noticeable differences between parsers as well. Add in the variable of file size and you quickly loose scope of what you're actually measuring. Another example, if your XML includes DTD descriptions and entity references that must be resolved over the wire and your network connection has high latency then you could see improvements with JSON. It all boils down to what you are really trying to do.

Answer 5

XML has a bit more overhead than JSON because of the angle brackets and extra information and what not. Any good parser should be able to parse JSON faster than XML for this reason.