JAVA读写大文本文档解决方案

JAVA读写大文本文档
现有一文本文档，千万行，每次读一行进行处理，循环每一行，用BufferedReader好像挺慢的，有什么办法能提高效率呢？

[解决办法]

Java code

void largeFileIO(String inputFile, String outputFile) {        try {            BufferedInputStream bis = new BufferedInputStream(new FileInputStream(new File(inputFile)));            BufferedReader in = new BufferedReader(new InputStreamReader(bis, "utf-8"), 10 * 1024 * 1024);//10M缓存            FileWriter fw = new FileWriter(outputFile);            while (in.ready()) {                String line = in.readLine();                fw.append(line + " ");            }            in.close();            fw.flush();            fw.close();        } catch (IOException ex) {            ex.printStackTrace();        }