/**
* @Title: createIndex @Description: 建立索引
*
* @param @param documentList
* @param @throws IOException
* @return void
* @throws
*/
public static void createIndex(List<Document> documentList, String path) throws IOException {
// 在当前路径下创建一个叫indexDir的目录
File file = new File(path);
String pathAll = file.getParentFile().getParentFile().toString() + "\\index";
File indexDir = new File(pathAll);
// 创建索引目录
Directory directory = FSDirectory.open(indexDir);
// 创建一个分词器
Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_36);
// 创建索引配置器
IndexWriterConfig indexWriterConfig = new IndexWriterConfig(Version.LUCENE_36, analyzer);
LogMergePolicy mergePolicy = new LogByteSizeMergePolicy();
// 设置segment添加文档(Document)时的合并频率
// 值较小,建立索引的速度就较慢
// 值较大,建立索引的速度就较快,>10适合批量建立索引
mergePolicy.setMergeFactor(50);
// 设置segment最大合并文档(Document)数
// 值较小有利于追加索引的速度
// 值较大,适合批量建立索引和更快的搜索
mergePolicy.setMaxMergeDocs(5000);
// 启用复合式索引文件格式,合并多个segment
mergePolicy.setUseCompoundFile(true);
indexWriterConfig.setMergePolicy(mergePolicy);
// 设置索引的打开模式
indexWriterConfig.setOpenMode(OpenMode.CREATE_OR_APPEND);
// 创建索引器
IndexWriter indexWriter = new IndexWriter(directory, indexWriterConfig);
for (Document document : documentList) {
// 把文档添加到索引库
indexWriter.addDocument(document);
}
// 提交索引到磁盘上的索引库,关闭索引器
indexWriter.close();
}
public static IndexWriter openWriter(
Directory directory, int maxMergeDocs, boolean useSerialMerger)
throws CorruptIndexException, LockObtainFailedException, IOException {
IndexWriterConfig indexWriterConfig = new IndexWriterConfig(LUCENE_VERSION, analyzer);
if (useSerialMerger) {
indexWriterConfig.setMergeScheduler(mergeScheduler);
}
LogMergePolicy mergePolicy = new LogByteSizeMergePolicy();
mergePolicy.setMaxMergeDocs(maxMergeDocs);
indexWriterConfig.setMergePolicy(mergePolicy);
return new IndexWriter(directory, indexWriterConfig);
}