从互联网(路径)将图片转化为byte数组

public byte[] getBytes(String filePath) {
try {
InputStream in = null;
DataInputStream dis = null;
HttpURLConnection connection = null;
URL server = new URL(filePath);
connection = (HttpURLConnection) server.openConnection();
connection.connect();
in = connection.getInputStream();
dis = new DataInputStream(in);
ByteArrayOutputStream baos = new ByteArrayOutputStream();
int ch = 0;
while ((ch = dis.read()) != -1) {
baos.write(ch);
}
byte[] imageData = baos.toByteArray();
if (baos != null) {
baos.close();
baos = null;
}
if (dis != null) {
dis.close();
dis = null;
}
if (in != null) {
in.close();
in = null;
}
if (connection != null) {
connection.disconnect();
connection = null;
}
return imageData;
} catch (Exception e) {
e.printStackTrace();
}
return null;
}