java.lang.IndexOutOfBoundsException at java.io.FileOutputStream.writeBytes(Native Method)

available : 3212
/usr/lk/data/linkapp/ddn_1440639847758_temp
1024
1024
java.lang.IndexOutOfBoundsException
at java.io.FileOutputStream.writeBytes(Native Method)
at java.io.FileOutputStream.write(FileOutputStream.java:260)
at com.lk.ddn.DDNRestUtil.getData(DDNRestUtil.java:439)
at com.lk.ddn.DDNRestUtil.main(DDNRestUtil.java:88)

public static byte[] getData(String oid) {
if (StringUtils.isEmpty(oid)) {
return null;
}
int nFileLength = -1;
String meta = "";
byte[] fileData = null;
try {
String httpurl = "http://"+host+"/cmd/get";
httpurl = "http://localhost/disk/myFileList.action";
httpurl = "http://localhost/register.jsp";
URL url = new URL(httpurl);
HttpURLConnection httpConnection = (HttpURLConnection) url.openConnection();
httpConnection.setRequestMethod("GET");
//            httpConnection.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 " +
//                    "(KHTML, like Gecko) Chrome/38.0.2125.101 Safari/537.36");
httpConnection.setRequestProperty("content-type", "application/octet-stream");
httpConnection.setDoOutput(true);
httpConnection.setDoInput(true);

int responseCode = httpConnection.getResponseCode();
if (responseCode >= 400) {
processErrorCode(responseCode);
return null; // -2 represent access is error
}

if (responseCode == HttpURLConnection.HTTP_OK) {
if (1==1) {

InputStream inputStream = null;
try {
//                        inputStream = httpConnection.getInputStream();
//                        int available = inputStream.available();
//                        System.out.println(" available : " + available);
//                        fileData = new byte[available];
//                        int read = inputStream.read(fileData);
//                        System.out.println(" read : " + read);
//                        int read = 0;
//                        while ((read = inputStream.read(fileData)) != -1) {
//
//                        }

//                        String contentEncoding = httpConnection.getContentEncoding();
//                        System.out.println(" contentEncoding : " + contentEncoding);
//
//                        inputStream = httpConnection.getInputStream();
//                        int available = inputStream.available();
//                        fileData = new byte[nFileLength];
//                        int read = inputStream.read(fileData);
//                        System.out.println(" read : " + read);
//                        while ((read = inputStream.read(fileData)) != -1) {
//
//                        }

inputStream = httpConnection.getInputStream();
int available = inputStream.available();
System.out.println(" available : " + available);

int offset = 0;
int reads;
int onesize = available>1024?1024:available;
//                        fileData = new byte[nFileLength];
//                        fis.reset();
//                        while ((reads = inputStream.read(fileData,offset,onesize)) != -1) {
//                            //System.out.println(new String(b));
//                            offset += reads;
//                            if (onesize >= available - offset) {
//                                onesize = available - offset;
//                                if (onesize <= 0) {
//                                    break;
//                                }
//                            }
//                        }
//                        while ((reads = inputStream.read(fileData)) != -1) {
//                            //System.out.println(new String(b));
//                            offset += reads;
//                        }

String downlowdPath = getTempFileDownlowdPath();
System.out.println(downlowdPath);
FileOutputStream fos = new FileOutputStream(downlowdPath);
int read = 0;

int off = 0;
available = inputStream.available();
byte[] b = new byte[1024];
while ((read = inputStream.read(b))!= -1) {
System.out.println(read);
fos.write(b,off,read);
off += read;
}
if (b != null) {
//                            fos.write(b);
}
System.out.println("readed : " + read);
inputStream.close();
fos.flush();
fos.close();
//
} catch (IOException e) {
e.printStackTrace();
} finally {
if (inputStream != null) {
inputStream.close();
}
}

}
}

} catch (IOException e) {
e.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
return fileData;

}