Java文件合并

第一种方法：

public static void files() {
		try {
			java.io.File file = new java.io.File("123.txt");
			java.io.FileOutputStream fos = new java.io.FileOutputStream(file);

			FileInputStream fis = new FileInputStream(new File("haha.txt"));
			FileInputStream fis1 = new FileInputStream(new File("abc.txt"));
			SequenceInputStream sis = new SequenceInputStream(fis, fis1);
			byte[] b = new byte[1];
			while ((sis.read(b)) != -1) {
				fos.write(b);
			}
			fos.flush();
			System.out.println("success!");
		} catch (Exception e) {
			System.out.println("error: " + e);
		}
	}

还有就是利用文件追加的方法合并

java如何追加写入txt文件