排序JAVA将两个大的排序文件合并为一个排序文件

Question

java中是否有jar文件或源代码实现了将两个大文件合并到一个文件中？或者，在java中合并两个大文件的最佳方法是什么

谢谢

Answer 1

为此，应使用外部合并排序
要了解外部合并排序，请参阅此link

下面是代码link

从上面的链接，只需在您的案例中使用合并操作：

 public static int mergeSortedFiles(List<File> files, File outputfile,
                final Comparator<String> cmp, Charset cs, boolean distinct,
                boolean append, boolean usegzip) throws IOException {
                ArrayList<BinaryFileBuffer> bfbs = new ArrayList<BinaryFileBuffer>();
                for (File f : files) {
                        final int BUFFERSIZE = 2048;
                        InputStream in = new FileInputStream(f);
                        BufferedReader br;
                        if (usegzip) {
                                br = new BufferedReader(
                                        new InputStreamReader(
                                                new GZIPInputStream(in,
                                                        BUFFERSIZE), cs));
                        } else {
                                br = new BufferedReader(new InputStreamReader(
                                        in, cs));
                        }

                        BinaryFileBuffer bfb = new BinaryFileBuffer(br);
                        bfbs.add(bfb);
                }
                BufferedWriter fbw = new BufferedWriter(new OutputStreamWriter(
                        new FileOutputStream(outputfile, append), cs));
                int rowcounter = mergeSortedFiles(fbw, cmp, distinct, bfbs);
                for (File f : files)
                        f.delete();
                return rowcounter;
        }