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java charset decode issue
public static void main(String[] _args) throws Exception {
    String str="a1a4:· a5f6:ヶ a8c5:ㄅ";
    ByteBuffer bf=readToByteBuffer(new ByteArrayInputStream(str.getBytes()));
    System.out.println(Charset.forName("GB2312").decode(bf).toString());
}
private static final int bufferSize = 0x20000;
static ByteBuffer readToByteBuffer(InputStream inStream) throws IOException {
    byte[] buffer = new byte[bufferSize];
    ByteArrayOutputStream outStream = new ByteArrayOutputStream(bufferSize);
    int read;
    while (true) {
        read = inStream.read(buffer);
        if (read == -1)
            break;
        outStream.write(buffer, 0, read);
    }
    ByteBuffer byteData = ByteBuffer.wrap(outStream.toByteArray());
    return byteData;
}

a1a4:? a5f6:ヶ a8c5:ㄅ