Question

首先，对于Tika和Lucene来说，我是一个完全的菜鸟。我正在通过Tika in Action书中试用这些例子。在第5章中给出了这个例子：

package tikatest01;

import java.io.File;
import org.apache.tika.Tika;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.Field.Index;
import org.apache.lucene.document.Field.Store;
import org.apache.lucene.index.IndexWriter;

public class LuceneIndexer {

    private final Tika tika;
    private final IndexWriter writer;

    public LuceneIndexer(Tika tika, IndexWriter writer) {
        this.tika = tika;
        this.writer = writer;
    }

    public void indexDocument(File file) throws Exception {
        Document document = new Document();
        document.add(new Field(
            "filename", file.getName(),
            Store.YES, Index.ANALYZED));
        document.add(new Field(
            "fulltext", tika.parseToString(file),
            Store.NO, Index.ANALYZED));
        writer.addDocument(document);
    }
}

这个主要方法：

package tikatest01;

import java.io.File;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.store.SimpleFSDirectory;
import org.apache.lucene.util.Version;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.tika.Tika;

public class TikaTest01 {

    public static void main(String[] args) throws Exception {

        String filename = "C:\\testdoc.pdf";
        File file = new File(filename);

        IndexWriter writer = new IndexWriter(
            new SimpleFSDirectory(file),
            new StandardAnalyzer(Version.LUCENE_30), 
            MaxFieldLength.UNLIMITED);
        try {
            LuceneIndexer indexer = new LuceneIndexer(new Tika(), writer);
            indexer.indexDocument(file);
            } 
        finally {
            writer.close();
            }
    }
}

我已将库tika-app-1.5.jar，lucene-core-4.7.0.jar和lucene-analyzers-common-4.7.0.jar添加到该项目中。

问题：

对于Lucene的当前版本，不推荐使用Field.Index，我应该使用什么呢？

找不到MaxFieldLength。我错过了一个导入？

Answer 1

对于Lucene 4.7，这个代码为索引器：

package tikatest01;

import java.io.File;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field.Store;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.IndexWriter;
import org.apache.tika.Tika;

public class LuceneIndexer {

    private final Tika tika;
    private final IndexWriter writer;

    public LuceneIndexer(Tika tika, IndexWriter writer) {
        this.tika = tika;
        this.writer = writer;
    }

    public void indexDocument(File file) throws Exception {
        Document document = new Document();
        document.add(new TextField(
                "filename", file.getName(), Store.YES));
        document.add(new TextField(
                "fulltext", tika.parseToString(file), Store.NO));
        writer.addDocument(document);
    }
}

主要类的代码：

package tikatest01;

import java.io.File;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.store.SimpleFSDirectory;
import org.apache.lucene.util.Version;
import org.apache.tika.Tika;

public class TikaTest01 {

    public static void main(String[] args) throws Exception {

        String dirname = "C:\\MyTestDir\\";
        File dir = new File(dirname);


        IndexWriter writer = new IndexWriter(
            new SimpleFSDirectory(dir), 
            new IndexWriterConfig(
                Version.LUCENE_47, 
                new StandardAnalyzer(Version.LUCENE_47)));
        try {
            LuceneIndexer indexer = new LuceneIndexer(new Tika(), writer);
            indexer.indexDocument(dir);
            } 
        finally {
            writer.close();
            }
    }
}

Answer 2

对于Lucene 4.7，IndexWriter没有这种构造函数看看API - http://lucene.apache.org/core/4_7_0/core/org/apache/lucene/index/IndexWriter.html

它只显示带有2个参数的构造函数，因此您需要将此示例应用于新的Lucene API

Tika in Action书中的例子Lucene StandardAnalyzer不起作用

2 个答案: