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