看一个简单的例子：

mport java.io.IOException; 
import org.apache.lucene.document.Document; 
import org.apache.lucene.document.Field; 
import org.apache.lucene.index.IndexWriter; 
import org.apache.lucene.index.Term; 
import org.apache.lucene.queryParser.QueryParser; 
import org.apache.lucene.search.Hits; 
import org.apache.lucene.search.IndexSearcher; 
import org.apache.lucene.search.Query; 
import org.apache.lucene.analysis.standard.StandardAnalyzer; 

public class UpdateDocument { 

private static String path = "d:/index"; 


public static void main(String[] args){ 
// addIndex(); 
updateIndex(); 
search("李四"); 
search("王五"); 
} 

public static void addIndex(){ 
try { 
IndexWriter write = new IndexWriter(path,new StandardAnalyzer(),true); 

Document doc = new Document(); 
doc.add(new Field("id","123456",Field.Store.YES,Field.Index.UN_TOKENIZED)); 
doc.add(new Field("userName","张三",Field.Store.YES,Field.Index.TOKENIZED)); 
doc.add(new Field("comefrom","北京",Field.Store.YES,Field.Index.TOKENIZED)); 

write.addDocument(doc); 

write.close(); 

} catch (IOException e) { 
e.printStackTrace(); 
} 
} 


public static void updateIndex(){ 
try { 

IndexWriter write = new IndexWriter(path,new StandardAnalyzer(),false); 
Document docNew = new Document(); 
docNew.add(new Field("id","123456",Field.Store.YES,Field.Index.UN_TOKENIZED)); 
docNew.add(new Field("userName","王五",Field.Store.YES,Field.Index.TOKENIZED)); 
Term term = new Term("id","123456"); 
/** 
调用updateDocument的方法，传给它一个新的doc来更新数据， 
Term term = new Term("id","1234567"); 
先去索引文件里查找id为1234567的Doc,如果有就更新它(如果有多条，最后更新后只有一条)。如果没有就新增. 

数据库更新的时候，我们可以只针对某个列来更新，而lucene只能针对一行数据更新。 
*/ 
write.updateDocument(term, docNew); 

write.close(); //注意在这里一定要关闭write 

} catch (IOException e) { 
e.printStackTrace(); 
} 
} 

public static Query queryParser(String str){ 
QueryParser queryParser = new QueryParser("userName", new StandardAnalyzer()); 
try { 
Query query = queryParser.parse(str); 
return query; 
} catch (Exception e) { 
e.printStackTrace(); 
} 
return null; 
} 

public static void search(String str){ 
try { 
IndexSearcher search = new IndexSearcher(path); 

Query query = queryParser(str); 

Hits hits = search.search(query); 
if(hits==null){ 
return; 
} 
if(hits.length() == 0){ 
System.out.println(" 没有搜索到‘" + str+"‘"); 
return; 
} 
for (int i = 0; i < hits.length(); i++) { 
Document doc = hits.doc(i); 
System.out.println("id = "+hits.id(i)); 
System.out.println("own id = " + doc.get("id")); 
System.out.println("userName = "+doc.get("userName")); 
System.out.println("come from = "+doc.get("comefrom")); 
System.out.println(""); 
} 

} catch (Exception e) { 
e.printStackTrace(); 
} 
} 

} 

关于Lucene的更新删除操作