how to download using java

I'm trying to download a file using a java program.
I want to send the range of bytes which I want to retrieve from the particular url.
In the code I want to download the bytes from 100 to 150 and the file's size is of 500 bytes
is the code correct?

Code:

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URL url=new URL("exampleurl";
URLConnection conn=url.openConnection();
conn.setRequestProperty("Accept-Ranges","bytes");
conn.setRequestProperty("Content-Range","bytes 100-150/500");
dis = new DataInputStream(con1.getInputStream());
message=dis .readLine();
while(!message.equals(" ") )
{
System.out.println(message);
message=dis .readLine();
}

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thanks

try with this code

Code:

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ArrayList<Byte> aba = new ArrayList<Byte>();
int n;
int counter = 0;

try{
  URL url = new URL(".....");
  InputStrean is = url.openStream();
  while ((n = is.read()) != -1){
    ++counter;
    aba.add(byte)n);
  }
}
catch (Excption e){
  ...
}
// use ArrayList aba for subsequent task

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