Java Reference
In-Depth Information
ings is also in the JDK documentation, in the file docs/guide/internat/encoding.doc.html . A
more detailed description is found in Appendix B of Java I/O (O'Reilly).
Those Pesky End-of-Line Characters
Problem
You really want to know about end-of-line characters.
Solution
Use \r and \n in whatever combination makes sense.
Discussion
If you are reading text (or bytes containing ASCII characters) in line mode using the
readLine() method, you'll never see the end-of-line characters, and so you won't be cursed
with having to figure out whether \n , \r , or \r\n appears at the end of each line. If you want
that level of detail, you have to read the characters or bytes one at a time, using the read()
methods. The only time I've found this necessary is in networking code, where some of the
line-mode protocols assume that the line ending is \r\n . Even here, though, you can still
work in line mode. When writing, pass \r\n into the print() (not println() !) method.
When reading, use readLine() and you won't have to deal with the characters:
outputSocket.print("HELO " + myName + "\r\n");
String response = inputSocket.readLine( );
For the curious, the strange spelling of “hello” is used in SMTP, the mail sending protocol,
where all commands must be four letters.
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