java - 我想将2个文件的内容复制到第三个文件中

Question

我已经编写了将一个文件内容复制到另一个文件的代码。但我无法将第二个文件内容复制到第三个文件。为此，我编写了以下代码:

    try {
        File infile = new File("d:\\vijay.txt");
        File outfile = new File("d:\\ajay.txt");

        FileInputStream instream = new FileInputStream(infile);
        FileOutputStream outstream = new FileOutputStream(outfile);

        byte[] buffer = new byte[1024];

        int length;

        while ((length = instream.read(buffer)) > 0) {
            outstream.write(buffer, 0, length);

        }
        instream.close();
        outstream.close();

        System.out.println("File Copied successfully");
    } catch (IOException ioe) {
        ioe.printStackTrace();
    }

请帮助我，在此先感谢。

Answer 1

如果您使用的是 Java 7，我建议您使用 Files 实用程序。例如:

Path source1 = Paths.get("src1.txt");
Path source2 = Paths.get("src2.txt");

Path destination = Paths.get("dest.txt");    
out = Files.newOutputStream(destination, CREATE, APPEND);

Files.copy(source1, destination, StandardCopyOption.REPLACE_EXISTING);
Files.copy(source2, destination);