索引的删除和更新

【删除索引】

    /**
     * 测试删除索引
     */
    @Test
    public void testDelete(){
        IndexWriter writer = null;
                
        try {
            //1、创建Directory
            Directory directory = FSDirectory.open(new File("E:\lucene\index2"));
            
            //2、创建Writer
            IndexWriterConfig config = new IndexWriterConfig(Version.LUCENE_35, new StandardAnalyzer(Version.LUCENE_35));
            writer = new IndexWriter(directory,config);
            
            //删除文件的索引
            //删除并不是真的删除，删除的索引信息会被存储到.del(相当于windows的回收站)文件
            writer.deleteDocuments(new Term("id","2"));
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        finally{
            if(writer != null){
                try {
                    writer.close();
                } catch (CorruptIndexException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
    }

【恢复删除】

【】 1     /**
     * 恢复删除
     */
    @Test
    public void testUnDelete(){
        IndexReader reader = null;
        
        try {
            //1、创建Directory
            Directory directory = FSDirectory.open(new File("E:\lucene\index2"));
            
            //2、创建IndexReader
            //默认情况下是只读的，如果执行恢复操作，Reader必须设置为false
            reader = IndexReader.open(directory, false);
            
            
            //恢复所有删除
            reader.undeleteAll();            
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        finally{
            if(reader != null){
                try {
                    reader.close();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
    }

【完全删除索引】

    /**
     * 完全删除索引
     * forceMergeDeletes()方法是对已经执行deleteDocuments()的索引进行删除
     * 完全删除是不可恢复的
     */
    @Test
    public void testForceMergeDeletes(){
        IndexWriter writer = null;
        
        try {
            //1、创建Directory
            Directory directory =FSDirectory.open(new File("E:\lucene\index2"));
            
            //2、创建IndexWriter
            IndexWriterConfig config = new IndexWriterConfig(Version.LUCENE_35, new StandardAnalyzer(Version.LUCENE_35));
            writer = new IndexWriter(directory,config);
            
            //删除索引
            //lucene3.5之前使用optimize()方法进行索引的删除
            //lucene3.5之后使用forceMergeDeletes()
            writer.forceMergeDeletes();
            
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        finally{
            if(writer != null)
                try {
                    writer.close();
                } catch (CorruptIndexException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
        }        
    }

【合并索引】

    /**
     * 合并索引
     * 合并索引一般不用手动操作。Lucene会自动执行索引的管理工作
     */
    @Test
    public void testForceMerge(){
        IndexWriter writer=null;
        
        try {
            //1、创建Dierecotry对象
            Directory directory = FSDirectory.open(new File("E:\lucene\index2"));
            
            //2、创建Writer对象
            IndexWriterConfig config = new IndexWriterConfig(Version.LUCENE_35, new StandardAnalyzer(Version.LUCENE_35));
            writer = new IndexWriter(directory,config);
            
            //合并索引
            writer.forceMerge(1);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        finally{
            if(writer != null)
                try {
                    writer.close();
                } catch (CorruptIndexException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
        }
    }

【更新索引】

    /**
     * 更新索引
     */
    @Test
    public void testUpdateDocument(){
        IndexWriter writer = null;
        
        try {
            //1、创建Directory对象
            Directory directory = FSDirectory.open(new File("E:\lucene\index2"));
            
            //2、创建Writer对象
            IndexWriterConfig config = new IndexWriterConfig(Version.LUCENE_35, new StandardAnalyzer(Version.LUCENE_35));
            writer = new IndexWriter(directory,config);
            
            //修改指定Document的内容
            Document doc = new Document();
            doc.add(new Field("id","1",Field.Store.YES,Field.Index.NOT_ANALYZED_NO_NORMS));
            doc.add(new Field("title","Are you ok",Field.Store.YES,Field.Index.NOT_ANALYZED));
            doc.add(new Field("author","Mike",Field.Store.YES,Field.Index.NOT_ANALYZED));
            doc.add(new Field("content", "Hello EveryOne, Are you ok? good",Field.Store.NO,Field.Index.ANALYZED));
            
            writer.updateDocument(new Term("id","1"), doc);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        finally{
            if(writer != null)
                try {
                    writer.close();
                } catch (CorruptIndexException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                } catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
        }
    }