如何在Java中合并两个输入流？

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

public class MergeInputStreams {
    public static void main(String[] args) {
        Path path1 = Paths.get("file1.txt");
        Path path2 = Paths.get("file2.txt");
        Path outputPath = Paths.get("merged.txt");

        try (FileInputStream fis1 = new FileInputStream(path1.toFile());
             FileInputStream fis2 = new FileInputStream(path2.toFile());
             FileOutputStream fos = new FileOutputStream(outputPath.toFile())) {

            fis1.transferTo(fos);
            fis2.transferTo(fos);

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}