文件复制！

今天看到文件的复制，就自己动手简单的写了一下！
1.通过FileInputStream 字节流实现：

@Test
	public void fileDemo() throws Exception {
		File file = new File("c:"+File.separator+"text.txt");		
		File filename=new File("c:"+File.separator+"textCopy.txt");
		if (filename.exists()) {
			filename.delete();
			filename.createNewFile();
			fileCopy(file,filename);
		} else {
			
			fileCopy(file,filename);
		}
	}
	public static void fileCopy(File file,File fileCopy) throws Exception{
		FileInputStream in = new FileInputStream(file);
		byte[] arr=new byte[in.available()];
		in.read(arr);
		FileOutputStream out =new FileOutputStream(fileCopy);
		out.write(arr);
		in.close();
		out.close();
	}

2.成行读取

@Test
	public void fileCopy() throws Exception {
		File file = new File("c:" + File.separator + "text.txt");
		File filename = new File("d:" + File.separator + "copy.txt");
		if (!filename.exists()) {
			filename.createNewFile();
		}
		copyDemo(file, filename);
	}

	public static void copyDemo(File file, File filename) throws Exception {
		BufferedReader bu = new BufferedReader(new FileReader(file));
		BufferedWriter wr = new BufferedWriter(new FileWriter(filename));
		String str = null;
		while ((str = bu.readLine()) != null) {
			wr.write(str);
			wr.newLine();
		}
		bu.close();
		wr.close();
	}

3.接收控制台输入的内容写到文件中

	@Test
	public void buffTest() throws IOException {
		InputStreamReader in = new InputStreamReader(System.in);
		BufferedReader bu = new BufferedReader(in);
		File file = new File("c:" + File.separator + "new.txt");
		BufferedWriter wr = new BufferedWriter(new FileWriter(file));
		String str = bu.readLine();
		System.out.println(str);
		wr.write(str);
		in.close();
		bu.close();
		wr.close();
	}