为什么readLine（）有效，而readUTF（）总是抛出IOException

Question

I send a post request to an address, and this address will return a xml format data back.

I can print out the data by readLine(), but when i use readUTF(), it always throws IOException . below is the code

DataInputStream input = new DataInputStream(urlCon.getInputStream());
String inputLine = "";

if((inputLine = input.readUTF()) != null) {
    System.out.println(inputLine.toString());
}
input.close();

why readUTF() does not work? is it because the data is xml format?

Answer 1

If you're reading lines, use readLine() . Data to be read with readUTF() must have been written with writeUTF(). See the Javadoc.

NB readUTF() doesn't return null, so testing for it is futile.