合并多个文件到一个文件夹

public static void main(String[] args) {
		
		File f1 = new File("D:/JavaTest/1.txt");
		File f2 = new File("D:/JavaTest/2.txt");
		File f3 = new File("D:/JavaTest/3.txt");
		
		String path = "D:/JavaTest/4.txt";
		
		joinText(path, f1, f2, f3);

	}
	
	/**
	 * 把所有的 file 内容合并到 path 对应的文件中
	 * @param path
	 * @param files
	 */
	public static void joinText(String path, File ...files) {
		
		try {
			FileOutputStream fos = new FileOutputStream(path, true);
			
			for (File file : files) {
				
				FileInputStream fis = new FileInputStream(file);
				
				int length = 0;
				
				byte[] bytes = new byte[1024];
				
				while ((length = fis.read(bytes)) != -1) {
					
					fos.write(bytes, 0, length);
				}
				
				fis.close();
				
				// 
 回车换行
				fos.write("
".getBytes());
			}
			
			fos.close();
		} catch (FileNotFoundException e) {

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

			e.printStackTrace();
		}
		
	}