read complete file without using loop in java

Question

Possible Duplicate    How to create a Java String from the contents of a file   Whole text file to a String in Java       I am trying to read the contents of a file using FileReader   But i want to read the file without reading a line by line   Is it possible to read the whole file without loop  I am using the following code   try         File ff new File  abc txt         FileReader fr new FileReader ff         String s       while br read    -1                   s br readLine                catch Exception ex          ex printStackTrace

User · Answer

If you are using Java 5 6  you can use Apache Commons IO for read file to string  The class org apache commons io FileUtils contais several method for read files   e g  using the method FileUtils readFileToString   File file   new File  abc txt    String content   FileUtils readFileToString file

User · Answer

If the file is small  you can read the whole data once   File file   new File  a txt    FileInputStream fis   new FileInputStream file   byte   data   new byte  int  file length     fis read data   fis close     String str   new String data   UTF-8

User · Answer

Since Java 11 you can do it even simpler   import java nio file Files   Files readString Path path   Files readString  Path path  Charset cs    Source  https   docs oracle com en java javase 11 docs api java base java nio file Files html readString java nio file Path

User · Answer

You can try using Scanner if you are using JDK5 or higher   Scanner scan   new Scanner file     scan useDelimiter    Z      String content   scan next       Or you can also use Guava  String data   Files toString new File  path txt    Charsets UTF8

User · Answer

Java 7 one line solution  List lt String gt  lines   Files readAllLines Paths get  file    StandardCharsets UTF 8     or    String text   new String Files readAllBytes Paths get  file     StandardCharsets UTF 8

[java] read complete file without using loop in java

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