How to Quickly Parse Zookeeper XML Configs with Groovy: A Practical Guide

During a recent service configuration audit, the author needed to extract settings for databases, Redis, and domain names from Zookeeper XML files and, lacking prior XML parsing experience, created a reusable Groovy utility.

Four XML parsing approaches are outlined: DOM, SAX, JDOM, and DOM4J. DOM and SAX are standard, platform‑independent methods, while JDOM and DOM4J are Java‑specific extensions. Because the target file is modest (~10,000 lines) and performance is not a concern, the author selected DOM parsing.

Groovy was chosen as the implementation language for its concise syntax and seamless Java interop; the author references a prior article on migrating from Java to Groovy for further reading.

The core code defines an XMLUtil class with static methods parseXml, parseRoot, and parseNode. It uses DocumentBuilderFactory to build a DOM tree, extracts node attributes into Attr objects, recursively builds a list of NodeInfo objects representing the XML hierarchy, and handles parsing exceptions with logging and a custom FailException.

A demo main method shows how to call parseXml on a sample file (e.g., /Users/fv/Downloads/dev.xml) and output the resulting structure. Console output screenshots (head and tail) illustrate the parsed result.

Images of the console output are included to demonstrate the utility's actual behavior.