lucene study

lucene7.3 official documentation

1. File index library

val docDir = Paths.get("index")

val directory=FSDirectory.open(Paths.get("index"))

The index library created in this way is to create an index folder on the local disk, and put the index in the index, also known as the file index library

Advantages: Persist the index to disk, which can be saved for a long time.

Disadvantages: Compared with the memory index library, the reading is slow

 

2. Memory index library

val directory = new RAMDirectory ()

Advantages: fast read

Disadvantages: No persistence capability, the memory index library will be deleted at the end

3. Combination of two index libraries

According to the characteristics of the two index libraries, we can combine the two indexes. The design idea is to copy the indexes in the file index library to the memory index library when the program starts.

Then let the program interact with the memory index library, and then persist the index of the memory index library to the file index library after the interaction is completed.

4. A small case

用scala编写的一个lucene简单应用

下载好依赖jar包，然后直接运行TestLucene.scala即可，