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how to find the specific line of a file

Posted on 2011-03-17
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Last Modified: 2012-06-21
Hi,
In Java, I know the path to the file.

Now, I want to find the specific line of this file and assign it to a variable.

The line that I wanna find looks like this:

# SOMEDATEandTIME (SOMETEXT)     SOMEDIGITNUMBER    <a href='http://SOMEPATH/SOMETEXT.html'>SOMETEXT</a>

SOMEDATEandTIME are in this format:  2011/03/04-15:10:20

How can I make it?

Thanks,

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Question by:Tolgar
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5 Comments
 
LVL 47

Expert Comment

by:for_yan
ID: 35160380
You can read file line by lin and then
find the line where

s.indexOf( "<a href='http://SOMEPATH/SOMETEXT.html'>SOMETEXT</a>") > -1)


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LVL 47

Expert Comment

by:for_yan
ID: 35160389


DataInputStream in = new DataInputStream(new FileInputStream("file_path_nmae"));
String buff = null;
while((buff= in.readline()) != null){
if(buff.indexOf( "<a href='http://SOMEPATH/SOMETEXT.html'>SOMETEXT</a>") > -1)
System.out.println(buff);

}
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LVL 47

Expert Comment

by:for_yan
ID: 35160400

String s;

try
{
DataInputStream in = new DataInputStream(new FileInputStream("file_path_nmae"));
String buff = null;
while((buff= in.readline()) != null){
if(buff.indexOf( "<a href='http://SOMEPATH/SOMETEXT.html'>SOMETEXT</a>") > -1)
System.out.println(buff);
s=buff;

}

in.close();

}catch(Exception ex){
ex.printStackTrace();
}

System.out.println("s: " + s);

This would actully print the last line which matches this pattern

 
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LVL 47

Accepted Solution

by:
for_yan earned 500 total points
ID: 35160414
corrected (forgot braces in the above):

String s;

try
{
DataInputStream in = new DataInputStream(new FileInputStream("file_path_nmae"));
String buff = null;
while((buff= in.readline()) != null){
if(buff.indexOf( "<a href='http://SOMEPATH/SOMETEXT.html'>SOMETEXT</a>") > -1){
System.out.println(buff);
s=buff;
}

}

in.close();

}catch(Exception ex){
ex.printStackTrace();
}

System.out.println("s: " + s);

This would actully print the last line which matches this pattern
0
 
LVL 47

Expert Comment

by:for_yan
ID: 35160433
If you can have some other lines which have the same
ending but different format of date - then you'll want to add
another clause i the "if" check in order to differentiate between the
two time formats.
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