lucene实例

刚结束了一个项目，回头想了下整个开发流程，决定再总结下缓存问题及lucene（全文检索）的运用。

    首先来谈下lucene

    项目的service端运用spring+hibernate开发。其间用到lucene做全文检索。版本为2.2，分词用的是JE-Analysis1.5.1.MMAnalyzer.建立索引用到队列。

   我们先在blogservice里初始化索引路径，其实现是在spring配置文件里设置：

 <bean id="blogService" class="cn.shell.service.BlogService"
  parent="baseService">
  
  <property name="indexPathRoot"
   value="${webapp.root}WEB-INF/index/blog/">
  </property>
  
</bean>

   项目中主要是要求提高性能，所以采用队列来创建索引。List  waitToIndexList=new LinkedList();

   创建索引部分：

   IndexWriter indexWriter;

   IndexSearcher indexSearcher;

   创建新线程：Thread indexThread=new Thread(this);

   实例分词：   MMAnalyzer analyzer=new MMAnalyzer();

   初始化部分：

  public void init(){

                              File rp = new File(indexPathRoot);
  if (!rp.exists()) {
   rp.mkdirs();
  }
  File segments = new File(indexPathRoot + File.separator
    + "segments.gen");
  boolean bCreate = true;
  if (segments.exists()) {
   bCreate = false;
  }
  try {
   
   indexWriter = new IndexWriter(indexPathRoot, analyzer, bCreate);
   indexSearcher = new IndexSearcher(indexPathRoot);
  } catch (Exception e) {
   logger.error("init indexWriter fail", e);
  }
  indexThread.start();                      //启动线程

}

public void run(){

while (!indexThread.isInterrupted()) {
   if (!waitToIndexList.isEmpty()) {
    Blog blog = (Blog) waitToIndexList.remove(0);
    Document doc = new Document();
    doc.add(new Field("blogID", blog.getBlogID(), Field.Store.YES,
      Field.Index.UN_TOKENIZED));
    doc.add(new Field("title", blog.getTitle(), Field.Store.YES,
      Field.Index.TOKENIZED));
    doc.add(new Field("content", blog.getContent(),
      Field.Store.YES, Field.Index.TOKENIZED));
    doc.add(new Field("author", blog.getClientUser().getNickName(),
      Field.Store.YES, Field.Index.TOKENIZED));

    try {
     indexWriter.addDocument(doc);
     indexWriter.flush();
     indexWriter.optimize();
    } catch (Exception e) {
     logger.error("create index error", e);
    }

   }

   try {
    Thread.sleep(50);
   } catch (Exception e) {
    logger.error(e);
   }

  }}

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