Reading from a CSV and it skips every second line. I have two CSV files, one for users, one for properties – the key ID is user.
String userName;
static String breakLine = "\n--------------------\n";
/**
* Method to create a new user in a CSV File
* @param sFileName
* @param user
*/
static void writeToCsvFile(String sFileName, User user)
{
try
{
FileWriter writer = new FileWriter(sFileName, true);
writer.append(user.displayUserName()); // get username from userinput
writer.append(","); // tabs to next record
writer.append(user.getPassword()); //gets password from userinput
writer.append(","); //tabs to next record
writer.append("\n");
writer.flush();
writer.close();
System.out.print("\nUser Successfully Created\n");
}
catch(IOException e)
{
e.printStackTrace();
}
}
/**
* Class to read User information from specified CSV file
* @param sFileName
* @param user
* @throws FileNotFoundException
*/
static boolean readFromCsvFile(String sFileName, User user) throws FileNotFoundException
{
String thisLine;
BufferedReader reader = new BufferedReader(new FileReader(sFileName));
try
{
// thisLine = reader.readLine();
//System.out.print(thisLine);
while((thisLine = reader.readLine()) != null)
{
String userDetails[] = thisLine.split(",");
if ((user.displayUserName().equals(userDetails[0])))
{
System.out.print("\nUser <-" + user.displayUserName() + " -> exists! Logging In\n\n");
return true;
}
else if ((thisLine = reader.readLine()) == null)
{
System.out.print("\nNo User Details Matching Those Entered Exist. Please Register or Recheck Details.");
return false;
}
}
}
catch(IOException e)
{
System.out.print("\nUser does not exist\n");
e.printStackTrace();
return false;
}
finally{
try
{ reader.close();
}catch (IOException e){}}
return false;
}
static void writeToPropertyFile(String sFileName, Property property)
{
try
{
FileWriter writer = new FileWriter(sFileName, true);
writer.append(property.getUser()); // get username from userinput
writer.append(","); // tabs to next record
writer.append(property.getAddress()); //gets address from userinput
writer.append(","); //tabs to next record
writer.append(property.getValue()); //gets property value from userinput
writer.append(","); //tabs to next record
writer.append(property.getLocation()); //gets property type from userinput
writer.append(","); //tabs to next record
writer.append(property.getResidenceStatus()); //gets residence status from userinput
writer.append(","); //tabs to next record
writer.append(property.getPaymentStatus()); //gets payment status from userinput
writer.append(","); //tabs to next record
writer.append(property.totalTax(property.privateResidence));
writer.append(",");
writer.append("\n");
writer.flush();
writer.close();
System.out.print("\nProperty Successfully Saved to " + property.getUser() + "\n");
}
catch(IOException e)
{
e.printStackTrace();
}
}
/**
* Method to read and print all properties belonging to a user
* @param sFileName
* @param property
* @param userName
* @throws FileNotFoundException
*/
static void readFromPropertyFile(String sFileName, String userName) throws FileNotFoundException
{
String thisLine;
BufferedReader reader = new BufferedReader(new FileReader(sFileName));
try
{
//thisLine = reader.readLine(); //skips first line in CSV
while((thisLine = reader.readLine()) != null)
{
String propertyDetails[] = thisLine.split(",");
if (propertyDetails[0].equals(userName))
{
System.out.print("\nUser: " + propertyDetails[0] + "\nAddress: " + propertyDetails[1] + "\nEst. Value: " + propertyDetails[2]
+ "\nLocation Cat: " + propertyDetails[3] + "\nPrivate Residence: " + propertyDetails[4] + "\nTax Paid: " + propertyDetails[5] + "\nTax Due: " + propertyDetails[6] + breakLine);
}
else if ((thisLine = reader.readLine()) == null)
System.out.print("\nNo Further Properties Found For This User\n");
}
}
catch(IOException e)
{
System.out.print("\nProperties do not exist\n");
e.printStackTrace();
}
finally{
try
{ reader.close();
}catch (IOException e){}}
}
}
I was running it with the following users
Chris,password
Michelle,password
Zach,password
etc (on seperate lines, seperated by appending \n at the end of the input stage)
Every odd numbered one was working and detecting that the user was logged in, each second one is skipping. I read up and I don’t think I have a .nextLine() running skipping as in this link but I only starting using CSVs and BufferedReader on Friday!
Its skipping every second line because you are reading two lines in every iteration and only using the odd ones.
I suggest instead using