因為lucene索引的時候是將String型的信息建立索引的，所以這里必須是將word/pdf/html等文件的內容轉化問字符型。
lucene的jar包自己去下載。
首先是建立索引的代碼：

public class TextFileIndexer {???
public static void main(String[] args) throws Exception {???
/* 指明要索引文件夾的位置,這里是d盤的s文件夾下 */
???????? File fileDir = new File("d:\\s");???
/* 這里放索引文件的位置 */
???????? File indexDir = new File("d:\\index");???
???????? Analyzer luceneAnalyzer = new StandardAnalyzer();???
???????? IndexWriter indexWriter = new IndexWriter(indexDir, luceneAnalyzer,???
true);???
???????? File[] textFiles = fileDir.listFiles();???
long startTime = new Date().getTime();???
//增加document到索引去
???????????????? System.out.println("File正在被索引.");??
/*
????????????????? * 注意要變的就是這里，路徑和讀取文件的方法
????????????????? * */
???????????????? String path ="d:\\s\\2.doc";
???????????????? String temp = ReadFile.readWord(path);
//???????????????? String path ="d:\\s\\index.htm";
//???????????????? String temp = ReadFile.readHtml(path);
???????????????? Document document = new Document();???
???????????????? Field FieldPath = new Field("path",path,
???????????????????????? Field.Store.YES, Field.Index.NO);???
???????????????? Field FieldBody = new Field("body", temp, Field.Store.YES,???
???????????????????????? Field.Index.TOKENIZED,???
???????????????????????? Field.TermVector.WITH_POSITIONS_OFFSETS);???
???????????????? document.add(FieldPath);???
???????????????? document.add(FieldBody);???
???????????????? indexWriter.addDocument(document);???
//optimize()方法是對索引進行優化
???????? indexWriter.optimize();???
???????? indexWriter.close();???
//測試一下索引的時間
long endTime = new Date().getTime();???
???????? System.out???
???????????????? .println("這花費了"??
??????????????????????? + (endTime - startTime)???
??????????????????????? + " 毫秒來把文檔增加到索引里面去!"??
??????????????????????? + fileDir.getPath());???
???? }??
}

上面已經注釋了要換的地方，我們要做的就是換文件的路徑和讀取文件的方法。
下面來具體看下讀取文件的方法
1.首先來看WORD文檔：
我這里用的是poi，相關jar包自己去下載，然后加到工程中（以下所要用的jar包也是，不再重復說）。
來看相關代碼：

public static String readWord(String path) {
???????? StringBuffer content = new StringBuffer("");// 文檔內容
try {
???????????? HWPFDocument doc = new HWPFDocument(new FileInputStream(path));
???????????? Range range = doc.getRange();
int paragraphCount = range.numParagraphs();// 段落
for (int i = 0; i < paragraphCount; i++) {// 遍歷段落讀取數據
???????????????? Paragraph pp = range.getParagraph(i);
???????????????? content.append(pp.text());
???????????? }
???????? } catch (Exception e) {
???????? }
return content.toString().trim();
???? }

2.PDF文件用的是PDFbox：

public static String readPdf(String path) throws Exception {
???????? StringBuffer content = new StringBuffer("");// 文檔內容
???????? FileInputStream fis = new FileInputStream(path);
???????? PDFParser p = new PDFParser(fis);
???????? p.parse();
???????? PDFTextStripper ts = new PDFTextStripper();
???????? content.append(ts.getText(p.getPDDocument()));
???????? fis.close();
return content.toString().trim();
???? }

3.html文件：

public static String readHtml(String urlString) {
???????? StringBuffer content = new StringBuffer("");
???????? File file = new File(urlString);
???????? FileInputStream fis = null;
try {
???????????? fis = new FileInputStream(file);
// 讀取頁面
???????????? BufferedReader reader = new BufferedReader(new InputStreamReader(
???????????????????? fis,"utf-8"));//這里的字符編碼要注意，要對上html頭文件的一致，否則會出亂碼
???????????? String line = null;
while ((line = reader.readLine()) != null) {
???????????????? content.append(line + "\n");
???????????? }
???????????? reader.close();
???????? } catch (Exception e) {
???????????? e.printStackTrace();
???????? }
???????? String contentString = content.toString();
return contentString;
???? }

4.txt文件：

public static String readTxt(String path) {
???????? StringBuffer content = new StringBuffer("");// 文檔內容
try {
???????????? FileReader reader = new FileReader(path);
???????????? BufferedReader br = new BufferedReader(reader);
???????????? String s1 = null;
while ((s1 = br.readLine()) != null) {
???????????????? content.append(s1 + "\r");
???????????? }
???????????? br.close();
???????????? reader.close();
???????? } catch (IOException e) {
???????????? e.printStackTrace();
???????? }
return content.toString().trim();
???? }

接下來數搜索代碼：

public class TestQuery {???
public static void main(String[] args) throws IOException, ParseException {???
???????? Hits hits = null;???
//搜索內容自己換
???????? String queryString = "根據國務院的決定";???
???????? Query query = null;??
???????? IndexSearcher searcher = new IndexSearcher("d:\\index"); //這里注意索引存放的路徑
???????? Analyzer analyzer = new StandardAnalyzer();???
try {???
???????????? QueryParser qp = new QueryParser("body", analyzer);???
/**
????????????? * 建索引的時候我們指定了body建立為內容，我們搜索的時候也是針對body的，所以
????????????? *??? QueryParser qp = new QueryParser("body", analyzer);
????????????? *??? 這句和建立索引時候
???????????????? Field FieldBody = new Field("body", temp, Field.Store.YES,???
???????????????????????? Field.Index.TOKENIZED,???
???????????????????????? Field.TermVector.WITH_POSITIONS_OFFSETS);
????????????? *的這句的"body"是對應的。
???????????? */
???????????? query = qp.parse(queryString);???
???????? } catch (ParseException e) {
???????????? System.out.println("異常");
???????? }???
if (searcher != null) {???
???????????? hits = searcher.search(query);???
if (hits.length() > 0) {???
???????????????? System.out.println("找到:" + hits.length() + " 個結果!");??
for (int i = 0; i < hits.length(); i++) {//輸出搜索信息
????????????????????? Document document = hits.doc(i);
????????????????????? System.out.println("contents："+document.get("body"));
//同樣原理這里的document.get("body")就是取得建立在索引文件里面的額body的所有內容
???????????????????? //你若想輸出文件路徑就用document.get("path")就可以了
???????????????? }
???????????? } else{
???????????????? System.out.println("0個結果!");
???????????? }???
???????? }??
???? }