Testsubbu
asked on
Read line from files based on a pattern
Dear java experts
I have a file test.file. This consists of 1000 or more lines
field1: field1Error: file1path,identifier1
field2: field2Error: file2path,identifier2
field3: field3Error: file3path,identifier3
field4: field4Error: file4path,identifier4
they are all similar pattern
i really wanto have 4 variables
String field
String Error
String Path
String id
and store them appropriately how do i read the file and store them as follows
field = field1
Error=field1Error
Path=file1path
id=identifier1
ALl thehelp is very much apprecaited.
thanks a lot,
Testsubbu
I have a file test.file. This consists of 1000 or more lines
field1: field1Error: file1path,identifier1
field2: field2Error: file2path,identifier2
field3: field3Error: file3path,identifier3
field4: field4Error: file4path,identifier4
they are all similar pattern
i really wanto have 4 variables
String field
String Error
String Path
String id
and store them appropriately how do i read the file and store them as follows
field = field1
Error=field1Error
Path=file1path
id=identifier1
ALl thehelp is very much apprecaited.
thanks a lot,
Testsubbu
Each FieldInfo object can be added to a collection in the loop
to read a file: http://www.javaalmanac.com/egs/java.io/ReadLinesFromFile.html
to write to a file: http://www.javaalmanac.com/egs/java.io/WriteToFile.html
to write to a file: http://www.javaalmanac.com/egs/java.io/WriteToFile.html
Set validOptions = new HashSet();
validOptions.add("field");
validOptions.add("error");
validOptions.add("path");
validOptions.add("id");
for each line you read
String[] fields = line.split(",");
Map map = new HashMap();
for (int i = 0; i < fields.length; i++)
{
String keyValues[] = fields[i].split(":");
String key = keyValues[0].trim().toLowe
if (validOptions.contains(key
{
write to file key and keyValue[1] which is the value
}
}
validOptions.add("field");
validOptions.add("error");
validOptions.add("path");
validOptions.add("id");
for each line you read
String[] fields = line.split(",");
Map map = new HashMap();
for (int i = 0; i < fields.length; i++)
{
String keyValues[] = fields[i].split(":");
String key = keyValues[0].trim().toLowe
if (validOptions.contains(key
{
write to file key and keyValue[1] which is the value
}
}
Oops, I thought you have "," as seperator for key value and ":" for seperator for value.
It actually seems not to be the case.
It actually seems not to be the case.
SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
>> I've already written the code for that
I saw what you wrote, and I wrote something different which assumes, wrongly, different semantics for ":" and ","
I saw what you wrote, and I wrote something different which assumes, wrongly, different semantics for ":" and ","
ASKER CERTIFIED SOLUTION
membership
This solution is only available to members.
To access this solution, you must be a member of Experts Exchange.
>>The idea to use a HashMap or Hashtable to fast manage and access the various FileInfo, as aozarov propose
That's not what the code posted by aozarov is actually doing. It's checking the validity of field identifiers in the file, which may not be there and i don't see why they should be. It was actually i who suggested using a collection for the purpose you mentioned:
>> Each FieldInfo object can be added to a collection in the loop
That's not what the code posted by aozarov is actually doing. It's checking the validity of field identifiers in the file, which may not be there and i don't see why they should be. It was actually i who suggested using a collection for the purpose you mentioned:
>> Each FieldInfo object can be added to a collection in the loop
Sorry CEHJ, screwed up copying the name.
No problem ;-)
:-)
String[] fields = line.split("[:,]");
FieldInfo info = new FieldInfo();
info.setField1(fields[0].t
info.setError(fields[1].tr
etc. for each line