java分页读取文件

/**
     * 
     * @param fileName 文件全路径
     * @param pageNo  页数
     * @param pageSize  每页的条数
     * @return
     */
    List<String> getLines(String fileName,int pageNo,int pageSize){
        File file = new File(fileName);
        BufferedReader reader = null;
        List<String> lines = new ArrayList<String>();
        try {
            int startRow = (pageNo - 1) * pageSize + 1;  //计算开始行数
            int endRow = pageNo * pageSize; //计算结束行数
            reader = new BufferedReader(new FileReader(file));
            LineNumberReader lineNumberReader = new LineNumberReader(new FileReader(file));
            lineNumberReader.skip(Long.MAX_VALUE);
            int lineNumber = lineNumberReader.getLineNumber() + 1;   //获取文件里面的总行数
            if(endRow >= lineNumber){
                endRow = lineNumber;
            }
            String tempString = "";
            int line = 0;
            // 一次读入一行，直到读入null为文件结束
            while (tempString != null) {
                line++;
                tempString = reader.readLine();
                 if(line >= startRow && line <= endRow) { 
                     lines.add(tempString);
                 }
            }
            reader.close();
            return lines;
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return null;
    }