Java：解析XML文件：DOM，SAX或StAX？ [英] Java: Parsing XML files: DOM, SAX or StAX?

问题描述

我正在使用Apache Tomcat开发一个RSS feed聚合器。我想知道为了阅读RSS提要而使用哪个解析器。我应该使用DOM，SAX还是StAX？我知道有特定的图书馆读取RSS feed与java，但由于这是一个大学项目，我不应该使用那些。
谢谢。

解决方案

这主要取决于你的需要。每个都有它自己的功能。

DOM - 将整个内容拉入内存并在其中四处走动。对于您想要做复杂的XML的相对较小的XML块很有用。 XSLT使用DOM。

SAX - 随着XML越来越流行，随时随地观看事物。对于大量的数据或比较简单的处理，可以使用。

StAX - 很像SAX，而不是响应流中发现的事件，您可以迭代通过xml - 请参阅什么时候应该选择SAX over StAX？，以便讨论哪个是最好的。

这里有一个很好的讨论使用DOM中的DOM，SAX和StAX解析器解析XML - 由Mohamed Sanaulla发表。注意：他的SAX解析器有一个错误 - 他应该追加字符，而不是替换它们，因为字符数据是累积的，可能会以块的形式出现。

  content = String.copyValueOf（ch，start，length）; 
  

应该是

 code> content + = String.copyValueOf（ch，start，length）; 
  

另外还有一个由Kaan Yamanyar发表的博客 DOM，SAX或StAX之间的差异。

I'm developing a RSS feed aggregator with Apache Tomcat. I was wondering which parser to use in order to read RSS feeds. Should I use DOM, SAX or StAX? I know that there are libraries specific to read RSS feeds with java but since this is a university project I am not supposed to use those. Thank you.

解决方案

It mostly depends on your needs. Each has it's own features.

DOM - pull the whole thing into memory and walk around inside it. Good for comparatively small chunks of XML that you want to do complex stuff with. XSLT uses DOM.

SAX - Walk the XML as it arrives watching for things as they fly past. Good for large amounts of data or comparatively simple processing.

StAX - Much like SAX but instead of responding to events found in the stream you iterate through the xml - See When should I choose SAX over StAX? for discussion of which is best.

There's a good discussion here Parsing XML using DOM, SAX and StAX Parser in Java - By Mohamed Sanaulla. NB: There's a fault in his SAX parser - he should append characters, not replace them as character data is cumulative and may arrive in chunks.

  content = String.copyValueOf(ch, start, length);

should be

  content += String.copyValueOf(ch, start, length);

Also a blog post by Kaan Yamanyar Differences between DOM, SAX or StAX.

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