lucene4.7实例详解
java.lang.UnsupportedClassVersionError: org/apache/lucene/index/IndexableField : Unsupported major.minor version 51.0
Apache Lucene 4.8.0发布:不再支持Java 6，因为Lucene4.9要求Java版本最低为Java7,本人用的是4.7.2因为我安装的是jdk6
一。lucene4.7版本的实例1
public class IndexFile {
protected String[] ids={"1", "2"};
protected String[] content={"Amsterdam has lost of add cancals", "i love add this girl"};
protected String[] city={"Amsterdam", "Venice"};
private Directory dir;
/**
* 初始添加文档
* @throws Exception
*/
@Before
public void init() throws Exception {
String pathFile="E:/indexPath";//创建索引存放位置
//1.4 通过Analyzer 的创建指定索引语言词汇的分析器
Analyzer analyzer=new StandardAnalyzer(Version.LUCENE_47);
//1.3 通过IndexWriterConfig的创建指定索引版本和语言词汇分析器
IndexWriterConfig iwc=new IndexWriterConfig(Version.LUCENE_47, analyzer);
//1.2 通过Directory的创建指定索引存放位置
dir=FSDirectory.open(new File(pathFile));
//1.1 创建IndexWriter,它的作用是用来写索引文件,
//可以将IndexWriter看做是一个特定类型的数据库,用来存放各种表,可以将Document看做是一张张的表
//该方法有两个参数,第一个dir参数为索引存放位置,参数类型为Directory,第二个参数conf为 IndexWriter的配置类
IndexWriter writer = new IndexWriter(dir, iwc);
for(int i=0; i < ids.length; i++) {
<span style="white-space:pre"> </span>//2.1 创建Document指定要索引的文档
<span style="white-space:pre"> </span>//可以将Document看做是数据库中的一张张的表,而每个field都是表中的一个colum用来存放各种类型的信息,如标题、作者、时间等等
Document doc=new Document();
doc.add(new StringField("id", ids[i], Store.YES));
doc.add(new TextField("content", content[i], Store.YES));
doc.add(new StringField("city", city[i], Store.YES));
writer.addDocument(doc);
}
//2.2表（Document）创建好之后,当然要添加到数据库（IndexWriter）中,同时commit
writer.commit();
writer.close();
}
/**
* 查询
* @throws Exception
*/
@Test
public void search() throws Exception {
String filePath="E:/indexPath";
//1.3 指定搜索目录
Directory dir=FSDirectory.open(new File(filePath));
//1.2创建IndexReader将搜索目录读取到内存
IndexReader reader=DirectoryReader.open(dir);
//1.1创建IndexSearcher准备搜索
IndexSearcher searcher=new IndexSearcher(reader);
//2.3 在content索引区搜索关键字“add”
Term term=new Term("content", "add");
//2.2 创建Query生成查询语法树
TermQuery query=new TermQuery(term);
//2.1 获取搜索结果,搜索相似度最高的5条记录
TopDocs topdocs=searcher.search(query, 5);
ScoreDoc[] scoreDocs=topdocs.scoreDocs;
System.out.println("查询结果总数： " + topdocs.totalHits+" 最大的评分:"+topdocs.getMaxScore());
for(int i=0; i < scoreDocs.length; i++) {
int doc = scoreDocs[i].doc;
Document document = searcher.doc(doc);//命中的文件
System.out.println("content===="+document.get("content"));
System.out.println("id:" + scoreDocs[i].doc + " score：" + scoreDocs[i].score+" index："+scoreDocs[i].shardIndex);
}
reader.close();
}
}
二、lucene4.6实例2
public class Constants {
public final static String INDEX_FILE_PATH = "F:\\lucene\\test"; //索引的文件的存放路径 测试时可以在本目录下自行建一些文档,内容自行编辑即可
public final static String INDEX_STORE_PATH = "F:\\lucene\\index"; //索引的存放位置
}
public class LuceneIndex {
/**
* 创建索引
* @param analyzer
* @throws Exception
*/
public static void createIndex(Analyzer analyzer) throws Exception{
Directory dire=FSDirectory.open(new File(Constants.INDEX_STORE_PATH));
IndexWriterConfig iwc=new IndexWriterConfig(Version.LUCENE_46, analyzer);
IndexWriter iw=new IndexWriter(dire, iwc);
this.addDoc(iw);
iw.close();
}
/**
* 动态添加Document
* @param iw
* @throws Exception
*/
public static void addDoc(IndexWriter iw) throws Exception{
File[] files=new File(Constants.INDEX_FILE_PATH).listFiles();
for (File file : files) {
Document doc=new Document();
String content=LuceneIndex.getContent(file);
String name=file.getName();
String path=file.getAbsolutePath();
doc.add(new TextField("content", content, Store.YES));
doc.add(new TextField("name", name, Store.YES));
doc.add(new TextField("path", path,Store.YES));
System.out.println(name+"==="+content+"==="+path);
iw.addDocument(doc);
iw.commit();
}
}
/**
* 获取文本内容
* @param file
* @return
* @throws Exception
*/
@SuppressWarnings("resource")
public static String getContent(File file) throws Exception{
FileInputStream fis=new FileInputStream(file);
InputStreamReader isr=new InputStreamReader(fis);
BufferedReader br=new BufferedReader(isr);
StringBuffer sb=new StringBuffer();
String line=br.readLine();
while(line!=null){
sb.append(line+"\n");
line=null;
}
return sb.toString();
}
/**
* 搜索
* @param query
* @throws Exception
*/
private static void search(Query query) throws Exception {
Directory dire=FSDirectory.open(new File(Constants.INDEX_STORE_PATH));
IndexReader ir=DirectoryReader.open(dire);
IndexSearcher is=new IndexSearcher(ir);
TopDocs td=is.search(query, 1000);
System.out.println("共为您查找到"+td.totalHits+"条结果");
ScoreDoc[] sds =td.scoreDocs;
for (ScoreDoc sd : sds) {
Document d = is.doc(sd.doc);
System.out.println(d.get("path") + ":["+d.get("path")+"]");
}
}
public static void main(String[] args) throws Exception, Exception {
Analyzer analyzer=new StandardAnalyzer(Version.LUCENE_46);
LuceneIndex.createIndex(analyzer);
QueryParser parser = new QueryParser(Version.LUCENE_46, "content", analyzer);
Query query = parser.parse("人");
LuceneIndex.search(query);
}
}
