使用BufferedReader.read（）处理'file'的末尾

Question

I have a client server program which MUST send a file's content as a String and am having trouble deciding how to end the while loop containing the BufferedReader.read method.I have the code as:

while((c = in.read()) != -1){                             
    fw.write((char)c);
    System.out.print((char)c);
}

But as it uses sockets, it never reaches -1 until the socket is closed. I cant figure out an ending clause for the while loop to reach. Are there any special characters?

Went with:

while((line = in.readLine()) != null && !line.equals(BasicProtocol.SENDING_FILE_DONE))

where SENDING_FILE_DONE is a String which is added to the end of the stream. Not a good way of doing it but has to be this way (I believe) when the data must be a String.

Answer 1

I have a client server program which MUST send a file's content as a String

Why? Bad idea. It should be sent as bytes. Otherwise you are running the risk of data corruption.

and am having trouble deciding how to end the while loop containing the BufferedReader.read() method

1. You shouldn't be using a BufferedReader at all, you should be using a BufferedInputStream , to avoid the assumption that the file contains text.
2. You should have sent the file size ahead of the file, and you should read the file size, then loop until you have read exactly that many bytes, OR You should close the socket after sending the file.

Answer 2

If you are using BufferedReader, you can try reading the entire line at one go ..

String line;
while((line = in.readLine()) != null) {
  // your code here
}