How to load a resource bundle from a file resource in Java

Question

I have a file called mybundle txt in c  temp -  c  temp mybundle txt  How do I load this file into a java util ResourceBundle  The file is a valid resource bundle   This does not seem to work   java net URL resourceURL   null   String path    c  temp mybundle txt   java io File fl   new java io File path    try      resourceURL   fl toURI   toURL      catch  MalformedURLException e                               URLClassLoader urlLoader   new URLClassLoader new java net URL   resourceURL    java util ResourceBundle bundle   java util ResourceBundle getBundle  path                    java util Locale getDefault    urlLoader

User · Answer

The file name should have  properties extension and the base directory should be in classpath  Otherwise it can also be in a jar which is in classpath Relative to the directory in classpath the resource bundle can be specified with   or   separator      is preferred

User · Answer

1  Change the extension to properties  ex  mybundle properties   2  Put your file into a jar and add it to your classpath  3  Access the properties using this code   ResourceBundle rb   ResourceBundle getBundle  mybundle    String propertyValue   rb getString  key

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If  like me  you actually wanted to load  properties files from your filesystem instead of the classpath  but otherwise keep all the smarts related to lookup  then do the following    Create a subclass of java util ResourceBundle Control Override the newBundle   method   In this silly example  I assume you have a folder at C  temp which contains a flat list of   properties  files   public class MyControl extends Control    Override public ResourceBundle newBundle String baseName  Locale locale  String format  ClassLoader loader  boolean reload          throws IllegalAccessException  InstantiationException  IOException        if   format equals  java properties              return null             String bundleName   toBundleName baseName  locale       ResourceBundle bundle   null          A simple loading approach which ditches the package              NOTE  This will require all your resource bundles to be uniquely named      int lastPeriod   bundleName lastIndexOf            if  lastPeriod    -1            bundleName   bundleName substring lastPeriod   1             InputStreamReader reader   null      FileInputStream fis   null      try            File file   new File  C   temp  mybundles   bundleName            if  file isFile         Also checks for existance             fis   new FileInputStream file               reader   new InputStreamReader fis  Charset forName  UTF-8                 bundle   new PropertyResourceBundle reader                   finally           IOUtils closeQuietly reader           IOUtils closeQuietly fis             return bundle         Note also that this supports UTF-8  which I believe isn t supported by default otherwise

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public class One        private static One one   null       Map lt String  String gt  configParameter   Collections synchronizedMap new HashMap lt String  String gt           private One             ResourceBundle rb   ResourceBundle getBundle  System   Locale getDefault              Enumeration en   rb getKeys            while  en hasMoreElements                  String key    String  en nextElement                String value   rb getString key               configParameter put key  value                         public static One getInstance             if  one    null                one  new One                       return one              public Map lt String  String gt  getParameter              return configParameter               public static void main String   args            String string   One getInstance   getParameter   get  subin            System out println string

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When you say it s  a valid resource bundle  - is it a property resource bundle  If so  the simplest way of loading it probably   try  FileInputStream fis   new FileInputStream  c  temp mybundle txt        return new PropertyResourceBundle fis

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From the JavaDocs for ResourceBundle getBundle String baseName       baseName - the base name of the   resource bundle  a fully qualified   class name   What this means in plain English is that the resource bundle must be on the classpath and that baseName should be the package containing the bundle plus the bundle name  mybundle in your case   Leave off the extension and any locale that forms part of the bundle name  the JVM will sort that for you according to default locale - see the docs on java util ResourceBundle for more info

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This worked for me very well  And it doesn t reload the bundle everytime  I tried to take some stats to load and reload the bundle from external file location   File file   new File  C   temp    URL   urls    file toURI   toURL     ClassLoader loader   new URLClassLoader urls   ResourceBundle rb   ResourceBundle getBundle  myResource   Locale getDefault    loader     where  c  temp  is the external folder  NOT on the classpath  holding the property files  and  myResource  relates to myResource properties  myResource fr FR properties  etc   Note  If you have the same bundle name on your classpath then it will be picked up by default using this constructor of URLClassLoader   Credit to http   www coderanch com t 432762 java java absolute-path-bundle-file  Find some of the stats below  all time in ms  I am not worried about the initial load time as that could be something with my workspace or code that I am trying to figure out but what I am trying to show is the reload took way lesser telling me its coming from memory   Here some of the stats    Initial Locale 1 load took 3486  Reload Locale 1 took 24  Reload Locale 1 took 23  Reload Locale 1 took 22  Reload Locale 1 took 15 Initial Locale 2 load took 870  Reload Locale 2 took 22  Reload Locale 2 took 18  Initial Locale 3 load took 2298  Reload Locale 3 took 8  Reload Locale 3 took 4

User · Answer

As long as you name your resource bundle files correctly  with a  properties extension   then this works   File file   new File  C   temp    URL   urls    file toURI   toURL     ClassLoader loader   new URLClassLoader urls   ResourceBundle rb   ResourceBundle getBundle  myResource   Locale getDefault    loader     where  c  temp  is the external folder  NOT on the classpath  holding the property files  and  myResource  relates to myResource properties  myResource fr FR properties  etc   Credit to http   www coderanch com t 432762 java java absolute-path-bundle-file

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If you wanted to load message files for different languages  just use the  shared loader   of catalina properties    for more info  visit http   theswarmintelligence blogspot com 2012 08 use-resource-bundle-messages-files-out html

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ResourceBundle rb   ResourceBundle getBundle  service      service properties System out println rb getString  server dns       server dns http

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For JSF Application  To get resource bundle prop files from a given file path to use them in a JSF app     Set the bundle with URLClassLoader for a class that extends ResourceBundle to load the bundle from the file path    Specify the class at basename property of loadBundle tag   lt f loadBundle    basename  Message  var  msg    gt    For basic implementation of extended RB please see the sample at Sample Customized Resource Bundle     Create this class to make it base class for Loading Bundle for JSF apps    public class Message extends ResourceBundle           public Messages                     File file   new File  D   properties  i18n                      ClassLoader loader null                     try                          URL   urls    file toURI   toURL                              loader   new URLClassLoader urls                           ResourceBundle bundle   getBundle  message   FacesContext getCurrentInstance   getViewRoot   getLocale    loader                          setParent bundle                            catch  MalformedURLException ex                                               Otherwise  get the bundle from getBundle method but locale from others source like Locale getDefault    the new  RB class may not require in this case

User · Answer

This works for me   File f   new File  some properties    Properties props   new Properties    FileInputStream fis   null  try       fis   new FileInputStream f       props load fis     catch  FileNotFoundException e        e printStackTrace                          catch  IOException e        e printStackTrace      finally       if  fis    null            try               fis close                fis   null            catch  IOException e2                e2 printStackTrace

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I think that you want the file s parent to be on the classpath  not the actual file itself   Try this  may need some tweaking    String path    c  temp mybundle txt   java io File fl   new java io File path    try      resourceURL   fl getParentFile   toURL      catch  MalformedURLException e       e printStackTrace                                           URLClassLoader urlLoader   new URLClassLoader new java net URL   resourceURL    java util ResourceBundle bundle   java util ResourceBundle getBundle  mybundle txt                    java util Locale getDefault    urlLoader

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I would prefer to use the resourceboundle class to load the properties - just to get it done in one line instead of 5 lines code through stream  Properties class and load     FYI           public void init ServletConfig servletConfig  throws ServletException       super init servletConfig        try                     Type1            Properties props   new Properties             String fileName   getServletContext   getRealPath  WEB-INF classes com test my properties                    stream   Thread currentThread   getContextClassLoader   getResourceAsStream fileName                   stream   ClassLoader getSystemResourceAsStream  WEB-INF class com test my properties               InputStream stream   getServletContext   getResourceAsStream   WEB-INF classes com test my properties                 props load new FileInputStream fileName            props load stream            stream close            Iterator keyIterator   props keySet   iterator            while keyIterator hasNext                      String key    String  keyIterator next                    String value    String  props getProperty key                   System out println  key     key     value      value                     Type2           Just get it done in one line by rb instead of 5 lines to load the properties      WEB-INF classes com test my properties file                             ResourceBundle rb   ResourceBundle getBundle  com test my   Locale ENGLISH  getClass   getClassLoader             ResourceBundle rb   ResourceBundle getBundle  com ibm multitool customerlogs ui nl redirect            Enumeration lt String gt  keys   rb getKeys            while keys hasMoreElements                  String key   keys nextElement                System out println key     -     rb getObject key                    catch  IOException e            e printStackTrace            throw new ServletException  Error loading config    e         catch  Exception e            e printStackTrace            throw new ServletException  Error loading config    e

[java] How to load a resource bundle from a file resource in Java?

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