Io读取大文件流

当逐行读写大于2G的文本文件时推荐使用以下代码

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()) {