Read file As String

Question

I need to load an xml file as String in android so I can load it to TBXML xml parser library and parse it  The implementation I have now to read the file as String takes around 2seconds even for a very small xml file of some KBs  Is there any known fast method that can read a file as string in Java Android     This is the code I have now   public static String readFileAsString String filePath        String result           File file   new File filePath       if   file exists                 byte   buffer   new byte  int  new File filePath  length             FileInputStream fis   null          try                 f   new BufferedInputStream new FileInputStream filePath                  f read buffer                fis   new FileInputStream file               char current              while  fis available    gt  0                    current    char  fis read                    result   result   String valueOf current                           catch  Exception e                Log d  TourGuide   e toString               finally               if  fis    null                  try                       fis close                      catch  IOException ignored                                      result   new String buffer             return result

User · Answer

It s very easy if you use Kotlin   val textFile   File cacheDir    text file txt   val allText   textFile readText   println allText    From readText   docs      Gets the entire content of this file as a String using UTF-8 or   specified charset  This method is not recommended on huge files  It   has an internal limitation of 2 GB file size

User · Answer

this is working for me  i use this path  String FILENAME PATH      mnt sdcard Download Version    public static String getStringFromFile  String filePath  throws Exception       File fl   new File filePath       FileInputStream fin   new FileInputStream fl       String ret   convertStreamToString fin         Make sure you close all streams      fin close                return ret

User · Answer

Reworked the method set originating from -  the accepted answer   JaredRummler An answer to your comment      Read file As String      Won t this add an extra new line at the end of the string    To prevent having a newline added at the end you can use a Boolean value set during the first loop as you will in the code example Boolean firstLine  public static String convertStreamToString InputStream is  throws IOException         http   www java2s com Code Java File-Input-Output ConvertInputStreamtoString htm     BufferedReader reader   new BufferedReader new InputStreamReader is        StringBuilder sb   new StringBuilder        String line   null      Boolean firstLine   true      while   line   reader readLine       null            if firstLine               sb append line               firstLine   false            else               sb append   n   append line                       reader close        return sb toString       public static String getStringFromFile  String filePath  throws IOException       File fl   new File filePath       FileInputStream fin   new FileInputStream fl       String ret   convertStreamToString fin         Make sure you close all streams      fin close        return ret

User · Answer

The code finally used is the following from   http   www java2s com Code Java File-Input-Output ConvertInputStreamtoString htm  public static String convertStreamToString InputStream is  throws Exception       BufferedReader reader   new BufferedReader new InputStreamReader is        StringBuilder sb   new StringBuilder        String line   null      while   line   reader readLine       null          sb append line  append   n              reader close        return sb toString       public static String getStringFromFile  String filePath  throws Exception       File fl   new File filePath       FileInputStream fin   new FileInputStream fl       String ret   convertStreamToString fin         Make sure you close all streams      fin close                return ret

User · Answer

With files we know the size in advance  so just read it all at once   String result  File file         long length   file length    if  length  lt  1    length  gt  Integer MAX VALUE        result           Log w TAG   File is empty or huge      file     else       try  FileReader in   new FileReader file             char   content   new char  int length            int numRead   in read content           if  numRead    length                Log e TAG   Incomplete read of     file      Read chars     numRead     of     length                     result   new String content  0  numRead             catch  Exception ex            Log e TAG   Failure reading     this file  ex           result

User · Answer

You can use org apache commons io IOUtils toString InputStream is  Charset chs  to do that   e g   IOUtils toString context getResources   openRawResource  lt your resource id gt    StandardCharsets UTF 8    For adding the correct library      Add the following to your app build gradle file   dependencies       compile  org apache directory studio org apache commons io 2 4             https   stackoverflow com a 33820307 1815624      or for the Maven repo see -  this link  For direct jar download see-  https   commons apache org proper commons-io download io cgi

User · Answer

public static String readFileToString String filePath        InputStream in   Test class getResourceAsStream filePath    filePath   com myproject Sample xml      try           return IOUtils toString in  StandardCharsets UTF 8         catch  IOException e            logger error  Failed to read the xml      e             return null

[android] Read file As String

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