Apache Lucene 4.5.0 发布，Java全文搜索引擎

Apache Lucene是一个高性能，全功能的全文搜索引擎库，完全用Java编写。它适用于几乎需要全文搜索功能的任何应用程序，尤其是跨平台的。

Lucene通过一个简单的API，提供了强大的功能：

Scalable, High-Performance Indexing

• over 150GB/hour on modern hardware
• small RAM requirements -- only 1MB heap
• incremental indexing as fast as batch indexing
• index size roughly 20-30% the size of text indexed

Powerful, Accurate and Efficient Search Algorithms

• ranked searching -- best results returned first
• many powerful query types: phrase queries, wildcard queries, proximity queries, range queries and more
• fielded searching (e.g. title, author, contents)
• sorting by any field
• multiple-index searching with merged results
• allows simultaneous update and searching
• flexible faceting, highlighting, joins and result grouping
• fast, memory-efficient and typo-tolerant suggesters
• pluggable ranking models, including the Vector Space Model and Okapi BM25
• configurable storage engine (codecs)

Cross-Platform Solution

• Available as Open Source software under the Apache License which lets you use Lucene in both commercial and Open Source programs
• 100%-pure Java
• Implementations in other programming languages available that are index-compatible