我正在以buffer(bytes(的形式获取图像数据,但我想将其转换为base64字符串。数据是在 JSONArray 中接收的,就像这样
JSONArray : `[53,57,51,47,53,57,51,55,50,98,98,54,53,51,54,97,102,101,53,101,102,54,57,54,53,54,53,51,102,98,53,99,98,98,99,51,98,48,52,57,56,52,52,101,54,48,50,99,56,55,101,54,53,97,51,102,56,49,56,57,56,98,102,56,49,57,97,57]`
为此,我将 JSONArray 复制到"byte" array
中,如下所示:
JSONArray bytearray_json = record.getJSONObject("image").getJSONArray("data");
byte[] bytes = new byte[bytearray_json.length()];
for (int i =0; i < bytearray_json.length(); i++ ) {
bytes[i] = (byte)bytearray_json.get(i);
}
String base_64 = Base64.encodeToString(bytes,Base64.DEFAULT);
但我得到一个例外:Cannot cast Integer to byte
我不能做bytearray_json.get(i).toString().getBytes();
因为它返回一个Byte Array
.
我该如何解决这个问题?
你可以试试这个,
JSONArray jsonArray = response.getJSONObject("image").getJSONArray("data");
byte[] bytes = new byte[jsonArray.length()];
for (int i = 0; i < jsonArray.length(); i++) {
bytes[i]=(byte)(((int)jsonArray.get(i)) & 0xFF);
}
Base64.encodeToString(bytes, Base64.DEFAULT);
感谢您@Hasangi的回答。
对于那些想要使用基于 Kotlin 的更现代答案的人:
fun JSONArray.toByteArray(): ByteArray {
val byteArr = ByteArray(length())
for (i in 0 until length()) {
byteArr[i] = (get(i) as Int and 0xFF).toByte()
}
return byteArr
}
并使用:
val bytes = jsonObj.getJSONArray("bytes").toByteArray()