Java中在磁盘上复制文件

• 使用字节流实现

          public static void main(String[] args) throws IOException {
  		InputStream in = new FileInputStream(new File("F:\test.py"));
  		byte[] bts = new byte[1024];
  		OutputStream out = new FileOutputStream(new File("D:\test\test.py"));
  		int len = 0;
  		while((len = in.read(bts))!=-1) {
  			out.write(bts, 0, len);
  		}
  		
  		out.close();
  		in.close();
  	}
  

  　　

• 使用字符流实现
  • char数组作为缓存

            public static void main(String[] args) throws IOException {
    		FileReader r = new FileReader("F:\test.py");
    		FileWriter w = new FileWriter("D:\test\test2.py");
    		char[] buf = new char[1024];
    		int c ;
    		while((c=r.read(buf))!=-1) {
    			w.write(buf,0,c);
    		}
    		r.close();
    		w.close();
    	}
    

    　　

  • 不使用数组做缓存，直接复制

            public static void main(String[] args) throws IOException {
    		FileReader r = new FileReader("F:\test.py");
    		FileWriter w = new FileWriter("D:\test\test2.py");
    //		char[] buf = new char[1024];
    		int c ;
    		while((c=r.read())!=-1) {
    			w.write(c);
    		}
    		r.close();
    		w.close();
    	}