java编码字节

public class Base64 {
	public static void main(String[] args) throws Exception {
		String str = "中国";
		byte[] byss = str.getBytes("gbk");
		System.out.println(byss.length);//4
		byte[] by = str.getBytes("utf-8");
		System.out.println(by.length); // 6
		byte[] bys = str.getBytes("ISO-8859-1");
		System.out.println(bys.length);//2
		System.out.println(str.getBytes().length); // 默认是4
		System.out.println(Charset.defaultCharset().displayName());
               // utf-8 根据当前计算机系统区域名设置
               //如果是其他语言比如西班牙  会显示windows-XX
	}
}