Read data from a text file using Java

Question

I need to read a text file line by line using Java  I use available   method of FileInputStream to check and loop over the file  But while reading  the loop terminates after the line before the last one  i e   if the file has 10 lines  the loop reads only the first 9 lines   Snippet used     while fis available    gt  0        char c    char fis read

User · Answer

public class FilesStrings    public static void main String   args  throws FileNotFoundException  IOException       FileInputStream fis   new FileInputStream  input txt        InputStreamReader input   new InputStreamReader fis       BufferedReader br   new BufferedReader input       String data      String result   new String         while   data   br readLine       null            result   result concat data                    System out println result

User · Answer

Try using java io BufferedReader like this   java io BufferedReader br   new java io BufferedReader new java io InputStreamReader new java io FileInputStream fileName     String line   null  while   line   br readLine       null     Process the line   br close

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In Java 8 you could easily turn your text file into a List of Strings with streams by using Files lines and collect   private List lt String gt  loadFile         URI uri   null      try           uri   ClassLoader getSystemResource  example txt   toURI          catch  URISyntaxException e            LOGGER error  Failed to load file    e             List lt String gt  list   null      try  Stream lt String gt  lines   Files lines Paths get uri              list   lines collect Collectors toList           catch  IOException e            LOGGER error  Failed to load file    e             return list

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user scanner it should work           Scanner scanner   new Scanner file            while  scanner hasNextLine                 System out println scanner nextLine                         scanner close

User · Answer

You can try FileUtils from org apache commons io FileUtils  try downloading jar from here    and you can use the following method  FileUtils readFileToString  yourFileName      Hope it helps you

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How about using Scanner  I think using Scanner is easier       private static void readFile String fileName           try            File file   new File fileName            Scanner scanner   new Scanner file            while  scanner hasNextLine                 System out println scanner nextLine                         scanner close             catch  FileNotFoundException e             e printStackTrace                      Read more about Java IO here

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If you want to read line-by-line  use a BufferedReader  It has a readLine   method which returns the line as a String  or null if the end of the file has been reached  So you can do something like   BufferedReader reader   new BufferedReader new InputStreamReader fis    String line  while   line   reader readLine       null        Do something with line     Note that this code doesn t handle exceptions or close the stream  etc

User · Answer

You should not use available    It gives no guarantees what so ever  From the API docs of available        Returns an estimate of the number of bytes that can be read  or skipped over  from this input stream without blocking by the next invocation of a method for this input stream    You would probably want to use something like  try       BufferedReader in   new BufferedReader new FileReader  infilename         String str      while   str   in readLine       null          process str       in close      catch  IOException e         taken from http   www exampledepot com egs java io ReadLinesFromFile html

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Simple code for reading file in JAVA   import java io     class ReadData       public static void main String args                  FileReader fr   new FileReader new File   lt put your file path here gt              while true                        int n fr read                if n gt -1                                char ch  char fr read                    System out print ch

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The way that I read integer numbers from a file is     import java util    import java io     public class Practice       public static void main String    args  throws IOException               Scanner input   new Scanner new File  cards txt              int times   input nextInt             for int i   0  i  lt  times  i                          int numbersFromFile   input nextInt                System out println numbersFromFile

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public class ReadFileUsingFileInputStream           param args    static int ch   public static void main String   args        File file   new File  C   text txt        StringBuffer stringBuffer   new StringBuffer          try           FileInputStream fileInputStream   new FileInputStream file           try               while  ch   fileInputStream read      -1                   stringBuffer append  char ch                                     catch  IOException e                   TODO Auto-generated catch block             e printStackTrace                        catch  FileNotFoundException e               TODO Auto-generated catch block         e printStackTrace              System out println  File contents          System out println stringBuffer

User · Answer

String file     path to your file txt    try        BufferedReader br   new BufferedReader new InputStreamReader new FileInputStream file         String line         Uncomment the line below if you want to skip the fist line  e g if headers         line   br readLine         while   line   br readLine       null                do something with line            br close       catch  IOException e        System out println  ERROR  unable to read file     file       e printStackTrace

User · Answer

Yes  buffering should be used for better performance   Use BufferedReader OR byte   to store your temp data   thanks

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Try this just a little search in Google   import java io    class FileRead       public static void main String args              try         Open the file that is the first         command line parameter     FileInputStream fstream   new FileInputStream  textfile txt           Get the object of DataInputStream     DataInputStream in   new DataInputStream fstream           BufferedReader br   new BufferedReader new InputStreamReader in        String strLine        Read File Line By Line     while   strLine   br readLine       null               Print the content on the console       System out println  strLine               Close the input stream     in close         catch  Exception e    Catch exception if any       System err println  Error      e getMessage

User · Answer

The reason your code skipped the last line was because you put fis available    gt  0 instead of fis available    gt   0

User · Answer

File file   new File  Path         FileReader reader   new FileReader file          while  ch reader read     -1                System out print  char ch           This worked for me

[java] Read data from a text file using Java

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