我在我的 Android 应用程序的事件日志中注意到我收到了 UTFDataFormatException 错误。我正在读取的文件是由我的应用程序编写的,尽管它存储有关用户故事的信息,因此它可以包含任何类型的字符/字符串。我想知道读取/写入某些字符是否有问题?
我使用以下方法编写:
dos.writeUTF(myJSONString);
我阅读使用:
textJSONString = dis.readUTF();
我记录的一些错误堆栈跟踪是:
class: class java.io.UTFDataFormatException
message: bad second or third byte at 1795
java.io.charset.ModifiedUtf8.decode(ModifiedUtf8.java:53)
java.io.DataInputStream.decodeUTF(DataInputStream.java:444)
java.io.DataInputStream.decodeUTF(DataInputStream.java:438)
java.io.DataInputStream.readUTF(DataInputStream.java:433)...
我已经查找了解码方法的来源,但我不明白发生了什么/为什么它失败了:
public static String decode(byte[] in, char[] out, int offset, int utfSize) throws UTFDataFormatException {
int count = 0, s = 0, a;
while (count < utfSize) {
if ((out[s] = (char) in[offset + count++]) < '\u0080') {
s++;
} else if (((a = out[s]) & 0xe0) == 0xc0) {
if (count >= utfSize) {
throw new UTFDataFormatException("bad second byte at " + count);
}
int b = in[offset + count++];
if ((b & 0xC0) != 0x80) {
throw new UTFDataFormatException("bad second byte at " + (count - 1));
}
out[s++] = (char) (((a & 0x1F) << 6) | (b & 0x3F));
} else if ((a & 0xf0) == 0xe0) {
if (count + 1 >= utfSize) {
throw new UTFDataFormatException("bad third byte at " + (count + 1));
}
int b = in[offset + count++];
int c = in[offset + count++];
if (((b & 0xC0) != 0x80) || ((c & 0xC0) != 0x80)) {
throw new UTFDataFormatException("bad second or third byte at " + (count - 2));
}
out[s++] = (char) (((a & 0x0F) << 12) | ((b & 0x3F) << 6) | (c & 0x3F));
} else {
throw new UTFDataFormatException("bad byte at " + (count - 1));
}
}
return new String(out, 0, s);
}
有任何想法吗?