常用IO

		// 将对象序列化，使对象流化之后进行读写和网络传输
		// BufferedReader 读取
		File file = new File("F:\\tianjun_about\\temp.txt");
//		 BufferedReader input = new BufferedReader(new FileReader(file));

		//将对应编码格式转化为当前workspace编码格式,例如下面将gb2312转为当前utf8
		BufferedReader input = new BufferedReader(new InputStreamReader(
				new FileInputStream(file), "gb2312"));

		String temp;
		StringBuilder temp2 = new StringBuilder(0);
		while ((temp = input.readLine()) != null)
		{
			temp2.append(temp).append("\n");
		}

 

		 //PrintWriter 写出
		 File file = new File("F:\\tianjun_about\\temp2.txt");
		 PrintWriter print = new PrintWriter(file);
		 print.println("测试");
		 print.print("测试2");
		 print.flush();
		 print.close();

 

 

		 File file = new File("F:\\tianjun_about\\cool");
		 //文件夹创建
				
		 //嵌套创建
		 file = new File("F:\\tianjun_about\\cool\\cooltest2");
				
		 file.mkdirs();
		 //改名
		 file.renameTo(new File(file.getParentFile().getPath() +
		 "/coolupdate"));
		 //删除
		 file.delete();