How to read a text-file resource into Java unit test

Question

I have a unit test that needs to work with XML file located in src test resources abc xml  What is the easiest way just to get the content of the file into String

User · Answer

You can try doing   String myResource   IOUtils toString this getClass   getResourceAsStream  yourfile xml    replace   n

User · Answer

With the use of Google Guava   import com google common base Charsets  import com google common io Resources   public String readResource final String fileName  Charset charset  throws Exception           try               return Resources toString Resources getResource fileName   charset             catch  IOException e                throw new IllegalArgumentException e                 Example   String fixture   this readResource  filename txt   Charsets UTF 8

User · Answer

Finally I found a neat solution  thanks to Apache Commons   package com example  import org apache commons io IOUtils  public class FooTest      Test    public void shouldWork   throws Exception       String xml   IOUtils toString        this getClass   getResourceAsStream  abc xml           UTF-8                 Works perfectly  File src test resources com example abc xml is loaded  I m using Maven    If you replace  abc xml  with  say    foo test xml   this resource will be loaded  src test resources foo test xml  You can also use Cactoos   package com example  import org cactoos io ResourceOf  import org cactoos io TextOf  public class FooTest      Test    public void shouldWork   throws Exception       String xml   new TextOf        new ResourceOf   com example abc xml      absolute path always        asString

User · Answer

First make sure that abc xml is being copied to your output directory   Then you should use getResourceAsStream     InputStream inputStream        Thread currentThread   getContextClassLoader   getResourceAsStream  test resources abc xml      Once you have the InputStream  you just need to convert it into a string   This resource spells it out  http   www kodejava org examples 266 html   However  I ll excerpt the relevent code   public String convertStreamToString InputStream is  throws IOException       if  is    null            Writer writer   new StringWriter             char   buffer   new char 1024           try               Reader reader   new BufferedReader                      new InputStreamReader is   UTF-8                 int n              while   n   reader read buffer      -1                    writer write buffer  0  n                           finally               is close                      return writer toString          else                   return

User · Answer

Right to the point    ClassLoader classLoader   getClass   getClassLoader    File file   new File classLoader getResource  file test xml   getFile

User · Answer

You can use a Junit Rule to create this temporary folder for your test    Rule public TemporaryFolder temporaryFolder   new TemporaryFolder     File file   temporaryFolder newFile   src test resources abc xml

User · Answer

Assume UTF8 encoding in file - if not  just leave out the  UTF8  argument  amp  will use the  default charset for the underlying operating system in each case   Quick way in JSE 6 - Simple  amp  no 3rd party library   import java io File  public class FooTest      Test public void readXMLToString   throws Exception           java net URL url   MyClass class getResource  test resources abc xml              Z means   The end of the input but for the final terminator  if any          String xml   new java util Scanner new File url toURI     UTF8   useDelimiter    Z   next            Quick way in JSE 7  public class FooTest      Test public void readXMLToString   throws Exception           java net URL url   MyClass class getResource  test resources abc xml            java nio file Path resPath   java nio file Paths get url toURI             String xml   new String java nio file Files readAllBytes resPath    UTF8           Quick way since Java 9  new String getClass   getClassLoader   getResourceAsStream resourceName  readAllBytes       Neither intended for enormous files though

User · Answer

Here s what i used to get the text files with text  I used commons  IOUtils and guava s Resources   public static String getString String path  throws IOException       try  InputStream stream   Resources getResource path  openStream              return IOUtils toString stream

[java] How to read a text-file resource into Java unit test?

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