How can I add a string to the end of a .txt file?
+1
A:
From here
BufferedWriter bw = null;
try {
bw = new BufferedWriter(new FileWriter("checkbook.txt", true));
bw.write("400:08311998:Inprise Corporation:249.95");
bw.newLine();
bw.flush();
} catch (IOException ioe) {
ioe.printStackTrace();
} finally { // always close the file
if (bw != null) {
try {
bw.close();
} catch (IOException ioe2) {
// just ignore it
}
}
}
As advised by Joachim Sauer, instead of using FileWriter, you can use
new OutputStreamWriter(new FileOutputStream(..), ecnoding)
if you want to specify the encoding of the file. FileWriter uses the default encoding, which changes from installation to installation.
Bozho
2010-07-15 08:27:04
Are you going to edit that to at least use a txt file so that it doesn't look so much like you just trawling for any rep you can get, even if the question doesn't make a whole lot of sense.
Lazarus
2010-07-15 08:30:48
...new FileWriter("checkbook.dat", true) --> the second parameter "true" means "append to the file"...
pgras
2010-07-15 08:34:22
Using a `FileWriter` means that you're pretty much ignoring the entire [encoding problem](http://www.joelonsoftware.com/articles/Unicode.html], which is a dangerous thing to do!
Joachim Sauer
2010-07-15 08:35:34
@Lazarus well, the extension of the file doesn't matter at all, if it is a text one. And the remark about the rep - you'd better spare those.
Bozho
2010-07-15 08:47:03
@Joachim Sauer - fair point. I added an update to warn about it.
Bozho
2010-07-15 08:49:27
@Bozho: actually, the alternative you presented **also** uses the default encoding of the file ;-) You'll need to provide a second argument to the `OutputStreamWriter` constructor.
Joachim Sauer
2010-07-15 08:50:12
hah, yes, I omitted all the arguments, but shouldn't have omitted this one.
Bozho
2010-07-15 08:51:23
@Bozho While it doesn't matter technically, your response doesn't speak to the OP's question specifically. What your answer looks like is a cut and paste without any real thought or explanation, that is until you edited the answer following some of the comments. Given all that I really does look like a 'Quick, get an answer, any answer, online even though the question is unclear so that I have max opportunity to get some rep'. I have no intention of sparing my opinion about your motives when you make such little effort, threats or not threats.
Lazarus
2010-07-15 11:30:55
@Lazarus - threats? eh.. my motives are to provide answers to what I know. Instead of writing this code, I copied it - after I verified it is what I would've written. You can check the tags I'm answering in, and you'll get a picture of how reputation-oriented my answers are (apart from the 'java' tag, the rest are not quite upvoted, apart from 2-3 enthusiasts). And this question was clear, albeit short.
Bozho
2010-07-15 11:33:53
@Bozho "And the remark about the rep - you'd better spare those" <- What would you call that other than a veiled threat? If your motives are good, then your conscience clear, then good for you. I applaud such people. If you really found the original question clear (it hadn't been edited when you posted your answer) then I'm astonished, you are obviously a much better person than I.
Lazarus
2010-07-15 12:19:25
+2
A:
English term to look for: "append"
You need to perform the following steps:
- open the file.
- append the string.
- close the file.
Read about the FileOutputStream class.
Anax
2010-07-15 08:28:59
`FileOutputStream` alone is the wrong tool when you want to write text to a .txt file. You will want to use a `Writer`. In this case you want to use a `OutputStreamWriter` wrapped around a `FileOutputStream` (there's also the `FileWriter`, but it's broken since it doesn't support [specifying an encoding](http://www.joelonsoftware.com/articles/Unicode.html)).
Joachim Sauer
2010-07-15 08:31:31