Java - 字符串中的字节数组

String str = "Hello, World!";
byte[] byteArray = str.getBytes(); // 使用默认字符集转换为字节数组

// 指定字符集转换为字节数组
byte[] utf8ByteArray = str.getBytes("UTF-8");
byte[] asciiByteArray = str.getBytes("ASCII");

// 打印字节数组
System.out.println(Arrays.toString(byteArray));
System.out.println(Arrays.toString(utf8ByteArray));
System.out.println(Arrays.toString(asciiByteArray));

[72, 101, 108, 108, 111, 44, 32, 87, 111, 114, 108, 100, 33]
[72, 101, 108, 108, 111, 44, 32, 87, 111, 114, 108, 100, 33]
[72, 101, 108, 108, 111, 44, 32, 87, 111, 114, 108, 100, 33]