Reading and displaying data from a txt file

Question

How do you read and display data from  txt files

User · Answer

In general    Create a FileInputStream for the file  Create an InputStreamReader wrapping the input stream  specifying the correct encoding Optionally create a BufferedReader around the InputStreamReader  which makes it simpler to read a line at a time  Read until there s no more data  e g  readLine returns null  Display data as you go or buffer it up for later    If you need more help than that  please be more specific in your question

User · Answer

If you want to take some shortcuts you can use Apache Commons IO   import org apache commons io FileUtils   String data   FileUtils readFileToString new File          UTF-8    System out println data      -

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I love this piece of code  use it to load a file into one String   File file   new File   my location    String contents   new Scanner file  useDelimiter    Z   next

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In Java 8  you can read a whole file  simply with   public String read String file  throws IOException     return new String Files readAllBytes Paths get file         or if its a Resource   public String read String file  throws IOException     URL url   Resources getResource file     return Resources toString url  Charsets UTF 8

User · Answer

If your file is strictly text  I prefer to use the java util Scanner class   You can create a Scanner out of a file by   Scanner fileIn   new Scanner new File thePathToYourFile      Then  you can read text from the file using the methods   fileIn nextLine       Reads one line from the file fileIn next       Reads one word from the file   And  you can check if there is any more text left with   fileIn hasNext       Returns true if there is another word in the file fileIn hasNextLine       Returns true if there is another line to read from the file   Once you have read the text  and saved it into a String  you can print the string to the command line with   System out print aString   System out println aString     The posted link contains the full specification for the Scanner class   It will be helpful to assist you with what ever else you may want to do

User · Answer

You most likely will want to use the FileInputStream class   int character  StringBuffer buffer   new StringBuffer      FileInputStream inputStream   new FileInputStream new File   home jessy file txt      while   character   inputStream read       -1          buffer append  char  character    inputStream close    System out println buffer     You will also want to catch some of the exceptions thrown by the read   method and FileInputStream constructor  but those are implementation details specific to your project

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BufferedReader in   new BufferedReader new FileReader   lt Filename gt        Then  you can use in readLine    to read a single line at a time   To read until the end  write a while loop as such   String line  while  line   in readLine       null        System out println line     in close

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public class PassdataintoFile        public static void main String   args  throws IOException            try               PrintWriter pw   new PrintWriter  C  new hello txt    UTF-8                PrintWriter pw1   new PrintWriter  C  new hello txt                 pw1 println  Hi chinni                 pw1 print  your succesfully entered text into file                 pw1 close              catch  FileNotFoundException e                   TODO Auto-generated catch block             e printStackTrace              catch  UnsupportedEncodingException e                   TODO Auto-generated catch block             e printStackTrace                      BufferedReader br   new BufferedReader new FileReader  C  new hello txt                String line             while  line   br readLine      null                              System out println line                           br close

User · Answer

Below is the code that you may try to read a file and display in java using scanner class  Code will read the file name from user and print the data Notepad VIM files    import java io    import java util Scanner  import java io     public class TestRead   public static void main String   input        String fname      Scanner scan   new Scanner System in           enter filename with extension to open and read its content         System out print  Enter File Name to Open  with extension like file txt            fname   scan nextLine            this will reference only one line at a time         String line   null      try                  FileReader reads text files in the default encoding            FileReader fileReader   new FileReader fname               always wrap the FileReader in BufferedReader            BufferedReader bufferedReader   new BufferedReader fileReader            while  line   bufferedReader readLine       null                        System out println line                         always close the file after use            bufferedReader close              catch IOException ex                System out println  Error reading file named      fname

[java] Reading and displaying data from a .txt file

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