Writing or modifying text files in java

Question

Dear all,
I have the next text file:
goods: 5
bids: 4
% num, price, good, good, ..., good, #
0 2075 1 4 #
1 3000 1 2 3 4 #
2 520 3 #
3 3000 2 3 4 #
I have to modify or create the file above, using output data from one java program. For example, The output of my java program in the next execution is:
goods: 8
and price (0) changes from 2075 to 2078.
so, using this output data my java program should write (create or modify) the next text file with the changes:
goods: 8
bids: 4
% num, price, good, good, ..., good, #
0 2078 1 4 #
1 3000 1 2 3 4 #
2 520 3 #
3 3000 2 3 4 #
I have tried using: output.write( objetc );
but it doesn't work as I need :( .
Somebody can help me or give me some idea?
Thanks,
Andrea

Answer 1

This is the code:
File testFile = new File("D:\\result1.txt");
setContents(testFile, " bla bla bla (few characters) ");
static public void setContents(File aFile, String aContents)
throws FileNotFoundException, IOException {
try {
//use buffering
output = new BufferedWriter( new FileWriter(aFile) );
output.write( aContents );
finally {
//flush and close both "output" and its underlying FileWriter
if (output != null) output.close();
I mean, this code dont work because it let me write few characters only. I need to write the whole file:
goods: 8
bids: 4
% num, price, good, good, ..., good, #
0 2078 1 4 #
1 3000 1 2 3 4 #
2 520 3 #
3 3000 2 3 4 #
with the special characters as (#).
Sorry, if it post is not clear.
Thanks.