Java中byte与String的相互转化

String转化为byte[]数组

String str = "asd";
byte[] bs = str.getBytes();

byte[]数组转化为String字符串

byte[] arr = {1,2,3};
String s = new String(arr);

设置格式

byte[] arr = {1,2,3};
String res = new String(arr,"UTF-8");