public class IndexTest {


/**
　*数据准备
　*/

    private String ids[] = { "1", "2", "3" };

    private String citys[] = { "qingdao", "nanjing", "shanghai" };

    private String descs[] = { "Qingdao is a beautiful city.", "Nanjing is a city of culture.",

            "Shanghai is a bustling city." };

    @Before

    public void setUp() throws IOException {

        IndexWriter indexWriter = getIndexWiter();

        for (int i = 0; i < ids.length; i++) {

            Document document = new Document();

            document.add(new StringField("id", ids[i], Field.Store.YES));

            document.add(new StringField("city", citys[i], Field.Store.YES));

            document.add(new StringField("desc", descs[i], Field.Store.NO));

            indexWriter.addDocument(document);

        }

        indexWriter.close();

    }

    /**

     * 实例化IndexWiter

     *

     * @return

     * @throws IOException

     */

    private IndexWriter getIndexWiter() throws IOException {

        Directory dir = FSDirectory.open(Paths.get("E:\\lucene2"));

        Analyzer analyzer = new StandardAnalyzer();

        IndexWriterConfig conf = new IndexWriterConfig(analyzer);

        IndexWriter indexWriter = new IndexWriter(dir, conf);

        return indexWriter;

    }

}

    /**

     * 测试写了几个文档

     *

     * @throws IOException

     */

    @Test

    public void tesWritert() throws IOException {

        IndexWriter indexWriter = getIndexWiter();

        System.out.println("一共写了" + indexWriter.numDocs() + "个文档");

        indexWriter.close();

    }
    

    /**

     * 测试读取了多少文档

     * @throws IOException

     */

    @Test

    public void testReader() throws IOException {

        IndexWriter indexWriter=getIndexWiter();

        System.out.println("最大文档数为:"+indexWriter.maxDoc());

        System.out.println("当前文档数为:"+indexWriter.numDocs());

        indexWriter.close();

    }

    /**

     * 测试删除 在合并前

     * @throws IOException

     */

    @Test

    public void testDeleteBeforeMerge() throws IOException {

        IndexWriter indexWriter=getIndexWiter();

        indexWriter.deleteDocuments(new Term("id","1"));

        System.out.println("删除前。。。。。"+indexWriter.numDocs()+"个文件");

        indexWriter.commit();

        System.out.println("writer.maxDoc()："+indexWriter.maxDoc());

        System.out.println("writer.numDocs()："+indexWriter.numDocs());

        indexWriter.close();

    }

    /**

     * 测试删除 在合并后,用强制删除的方法会立即在索引表删除文档，

     * 这种方法比较耗cpu，建议数据量不大的系统使用，数据量大的系统建议不写indexWriter.forceMergeDeletes(); 就不会立即删除文档

     * @throws IOException

     */

    @Test

    public void testDeleteAfterMerge() throws IOException {

        IndexWriter indexWriter=getIndexWiter();

        indexWriter.deleteDocuments(new Term("id","1"));

        System.out.println("删除前。。。。。"+indexWriter.numDocs()+"个文件");

        indexWriter.forceMergeDeletes(); // 强制删除

        indexWriter.commit();

        System.out.println("writer.maxDoc()："+indexWriter.maxDoc());

        System.out.println("writer.numDocs()："+indexWriter.numDocs());

        indexWriter.close();

    }

    /**

     * 测试更新

     * @throws Exception

     */

    @Test

    public void testUpdate()throws Exception{

        IndexWriter writer=getIndexWiter();

        Document doc=new Document();

        doc.add(new StringField("id", "1", Field.Store.YES));

        doc.add(new StringField("city","qingdao",Field.Store.YES));

        doc.add(new TextField("desc", "dsss is a city.", Field.Store.NO));

        writer.updateDocument(new Term("id","1"), doc);

        writer.close();

    }