问使用java在文本文件中查找单词的行号

EN

public int grepLineNumber(String file, String word) throws Exception {
    BufferedReader buf = new BufferedReader(new InputStreamReader(new DataInputStream(new FileInputStream(file))));

    String line;
    int lineNumber = 0;
    while ((line = buf.readLine()) != null)   {
        lineNumber++;
        if (word.equals(line)) {
            return lineNumber;
        }
    }
    return -1;
}

public ArrayList<Integer> find(String word, File text) throws IOException {
    LineNumberReader rdr = new LineNumberReader(new FileReader(text));
    ArrayList<Integer> results = new ArrayList<Integer>();
    try {
        String line = rdr.readLine();
        if (line.indexOf(word) >= 0) {
            results.add(rdr.getLineNumber());
        }
    } finally {
        rdr.close();
    }
    return results;
}