本文整理了Java中org.apache.commons.io.FilenameUtils.getExtension()方法的一些代码示例，展示了FilenameUtils.getExtension()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。FilenameUtils.getExtension()方法的具体详情如下：
包路径：org.apache.commons.io.FilenameUtils
类名称：FilenameUtils
方法名：getExtension

FilenameUtils.getExtension介绍

[英]Gets the extension of a filename.

This method returns the textual part of the filename after the last dot. There must be no directory separator after the dot.

foo.txt      --> "txt" 
a/b/c.jpg    --> "jpg" 
a/b.txt/c    --> "" 
a/b/c        --> ""

The output will be the same irrespective of the machine that the code is running on.
[中]获取文件名的扩展名。
此方法返回文件名最后一个点后的文本部分。点后面不能有目录分隔符。

foo.txt      --> "txt" 
a/b/c.jpg    --> "jpg" 
a/b.txt/c    --> "" 
a/b/c        --> ""

无论代码在哪台机器上运行，输出都是相同的。

代码示例

代码示例来源：origin: gocd/gocd

public boolean namecheckForJar(String filename) {
    return FilenameUtils.getExtension(filename).equals("jar");
  }
}

代码示例来源：origin: commons-io/commons-io

/**
 * Compare the extensions of two files the specified case sensitivity.
 *
 * @param file1 The first file to compare
 * @param file2 The second file to compare
 * @return a negative value if the first file's extension
 * is less than the second, zero if the extensions are the
 * same and a positive value if the first files extension
 * is greater than the second file.
 *
 */
@Override
public int compare(final File file1, final File file2) {
  final String suffix1 = FilenameUtils.getExtension(file1.getName());
  final String suffix2 = FilenameUtils.getExtension(file2.getName());
  return caseSensitivity.checkCompareTo(suffix1, suffix2);
}

代码示例来源：origin: SonarSource/sonarqube

public static String getByFilename(String filename) {
  String extension = FilenameUtils.getExtension(filename);
  String mime = null;
  if (!Strings.isNullOrEmpty(extension)) {
   mime = MAP.get(extension.toLowerCase(Locale.ENGLISH));
  }
  return mime != null ? mime : DEFAULT;
 }
}

代码示例来源：origin: jeremylong/DependencyCheck

/**
 * Returns the (lowercase) file extension for a specified file.
 *
 * @param fileName the file name to retrieve the file extension from.
 * @return the file extension.
 */
public static String getFileExtension(String fileName) {
  final String fileExt = FilenameUtils.getExtension(fileName);
  return null == fileExt || fileExt.isEmpty() ? null : fileExt.toLowerCase();
}

代码示例来源：origin: SonarSource/sonarqube

/**
 * @see org.sonar.api.server.ws.WebService.NewAction#setResponseExample(java.net.URL)
 */
@CheckForNull
public String responseExampleFormat() {
 if (responseExample != null) {
  return StringUtils.lowerCase(FilenameUtils.getExtension(responseExample.getFile()));
 }
 return null;
}

代码示例来源：origin: Meituan-Dianping/walle

private void generateChannelApk(final File inputFile, final File outputDir, final String channel) {
    final String name = FilenameUtils.getBaseName(inputFile.getName());
    final String extension = FilenameUtils.getExtension(inputFile.getName());
    final String newName = name + "_" + channel + "." + extension;
    final File channelApk = new File(outputDir, newName);
    try {
      FileUtils.copyFile(inputFile, channelApk);
      ChannelWriter.put(channelApk, channel, extraInfo);
    } catch (IOException | SignatureNotFoundException e) {
      e.printStackTrace();
    }
  }
}

代码示例来源：origin: Meituan-Dianping/walle

private void generateChannelApk(final File inputFile, final File outputDir, final String channel, final String alias, final Map<String, String> extraInfo) {
    final String channelName = alias == null ? channel : alias;
    final String name = FilenameUtils.getBaseName(inputFile.getName());
    final String extension = FilenameUtils.getExtension(inputFile.getName());
    final String newName = name + "_" + channelName + "." + extension;
    final File channelApk = new File(outputDir, newName);
    try {
      FileUtils.copyFile(inputFile, channelApk);
      ChannelWriter.put(channelApk, channel, extraInfo);
    } catch (IOException | SignatureNotFoundException e) {
      e.printStackTrace();
    }
  }
}

代码示例来源：origin: knightliao/disconf

/**
 * 根据文件名返回其文件后缀ENUM
 */
public static SupportFileTypeEnum getByFileName(String fileName) {
  String extension = FilenameUtils.getExtension(fileName);
  if (StringUtils.isEmpty(extension)) {
    return SupportFileTypeEnum.ANY;
  }
  for (SupportFileTypeEnum supportFileTypeEnum : SupportFileTypeEnum.values()) {
    if (extension.equals(supportFileTypeEnum.modelName)) {
      return supportFileTypeEnum;
    }
  }
  return SupportFileTypeEnum.ANY;
}

代码示例来源：origin: pmd/pmd

@Override
  public FileVisitResult visitFile(final Path file,
      final BasicFileAttributes attrs) throws IOException {
    String extension = FilenameUtils.getExtension(file.toString());
    if ("jar".equalsIgnoreCase(extension)) {
      fileVisitor.visitFile(file, attrs);
    }
    return FileVisitResult.CONTINUE;
  }
};

代码示例来源：origin: ata4/disunity

public static boolean isResource(BundleEntry entry) {
  String ext = FilenameUtils.getExtension(entry.name());
  return ext.equals("resource");
}

代码示例来源：origin: ata4/disunity

public static boolean isLibrary(BundleEntry entry) {
  String ext = FilenameUtils.getExtension(entry.name());
  return ext.equals("dll") || ext.equals("mdb");
}

代码示例来源：origin: pentaho/pentaho-kettle

@Override public String getMimeType( String name ) {
 String extension = FilenameUtils.getExtension( name );
 return getMimeTypes().get( extension );
}

代码示例来源：origin: commons-io/commons-io

/**
 * Checks whether the extension of the filename is that specified.
 * <p>
 * This method obtains the extension as the textual part of the filename
 * after the last dot. There must be no directory separator after the dot.
 * The extension check is case-sensitive on all platforms.
 *
 * @param filename  the filename to query, null returns false
 * @param extension  the extension to check for, null or empty checks for no extension
 * @return true if the filename has the specified extension
 * @throws java.lang.IllegalArgumentException if the supplied filename contains null bytes
 */
public static boolean isExtension(final String filename, final String extension) {
  if (filename == null) {
    return false;
  }
  failIfNullBytePresent(filename);
  if (extension == null || extension.isEmpty()) {
    return indexOfExtension(filename) == NOT_FOUND;
  }
  final String fileExt = getExtension(filename);
  return fileExt.equals(extension);
}

代码示例来源：origin: commons-io/commons-io

/**
 * Checks whether the extension of the filename is one of those specified.
 * <p>
 * This method obtains the extension as the textual part of the filename
 * after the last dot. There must be no directory separator after the dot.
 * The extension check is case-sensitive on all platforms.
 *
 * @param filename  the filename to query, null returns false
 * @param extensions  the extensions to check for, null checks for no extension
 * @return true if the filename is one of the extensions
 * @throws java.lang.IllegalArgumentException if the supplied filename contains null bytes
 */
public static boolean isExtension(final String filename, final Collection<String> extensions) {
  if (filename == null) {
    return false;
  }
  failIfNullBytePresent(filename);
  if (extensions == null || extensions.isEmpty()) {
    return indexOfExtension(filename) == NOT_FOUND;
  }
  final String fileExt = getExtension(filename);
  for (final String extension : extensions) {
    if (fileExt.equals(extension)) {
      return true;
    }
  }
  return false;
}

代码示例来源：origin: commons-io/commons-io

/**
 * Checks whether the extension of the filename is one of those specified.
 * <p>
 * This method obtains the extension as the textual part of the filename
 * after the last dot. There must be no directory separator after the dot.
 * The extension check is case-sensitive on all platforms.
 *
 * @param filename  the filename to query, null returns false
 * @param extensions  the extensions to check for, null checks for no extension
 * @return true if the filename is one of the extensions
 * @throws java.lang.IllegalArgumentException if the supplied filename contains null bytes
 */
public static boolean isExtension(final String filename, final String[] extensions) {
  if (filename == null) {
    return false;
  }
  failIfNullBytePresent(filename);
  if (extensions == null || extensions.length == 0) {
    return indexOfExtension(filename) == NOT_FOUND;
  }
  final String fileExt = getExtension(filename);
  for (final String extension : extensions) {
    if (fileExt.equals(extension)) {
      return true;
    }
  }
  return false;
}

代码示例来源：origin: pentaho/pentaho-kettle

protected static String getFileType( final String fineName ) {
 final String fileExt = fineName == null ? null : FilenameUtils.getExtension( fineName );
 String fileType = BaseMessages.getString( PKG, "System.FileType.File" );
 if ( "ktr".equals( fileExt ) ) {
  fileType = BaseMessages.getString( PKG, "System.FileType.Transformation" );
 } else if ( "kjb".equals( fileExt ) ) {
  fileType = BaseMessages.getString( PKG, "System.FileType.Job" );
 }
 return fileType;
}

代码示例来源：origin: SonarSource/sonarqube

@Override
public boolean match(Path absolutePath, Path relativePath, boolean caseSensitiveFileExtension) {
 String path = PathUtils.sanitize(absolutePath.toString());
 if (!caseSensitiveFileExtension) {
  String extension = sanitizeExtension(FilenameUtils.getExtension(path));
  if (StringUtils.isNotBlank(extension)) {
   path = StringUtils.removeEndIgnoreCase(path, extension);
   path = path + extension;
  }
 }
 return pattern.match(path);
}

代码示例来源：origin: SonarSource/sonarqube

@Override
public boolean match(Path absolutePath, Path relativePath, boolean caseSensitiveFileExtension) {
 String path = PathUtils.sanitize(relativePath.toString());
 if (!caseSensitiveFileExtension) {
  String extension = sanitizeExtension(FilenameUtils.getExtension(path));
  if (StringUtils.isNotBlank(extension)) {
   path = StringUtils.removeEndIgnoreCase(path, extension);
   path = path + extension;
  }
 }
 return path != null && pattern.match(path);
}

代码示例来源：origin: commons-io/commons-io

@Test
public void testGetExtension() {
  assertEquals(null, FilenameUtils.getExtension(null));
  assertEquals("ext", FilenameUtils.getExtension("file.ext"));
  assertEquals("", FilenameUtils.getExtension("README"));
  assertEquals("com", FilenameUtils.getExtension("domain.dot.com"));
  assertEquals("jpeg", FilenameUtils.getExtension("image.jpeg"));
  assertEquals("", FilenameUtils.getExtension("a.b/c"));
  assertEquals("txt", FilenameUtils.getExtension("a.b/c.txt"));
  assertEquals("", FilenameUtils.getExtension("a/b/c"));
  assertEquals("", FilenameUtils.getExtension("a.b\\c"));
  assertEquals("txt", FilenameUtils.getExtension("a.b\\c.txt"));
  assertEquals("", FilenameUtils.getExtension("a\\b\\c"));
  assertEquals("", FilenameUtils.getExtension("C:\\temp\\foo.bar\\README"));
  assertEquals("ext", FilenameUtils.getExtension("../filename.ext"));
}

代码示例来源：origin: pentaho/pentaho-kettle

private NamedParams getMeta( RepositoryFile file ) throws KettleException {
 NamedParams meta = null;
 if ( file != null ) {
  String extension = FilenameUtils.getExtension( file.getName() );
  Repository repo = PDIImportUtil.connectToRepository( null );
  if ( "ktr".equalsIgnoreCase( extension ) ) {
   meta = new TransMeta( convertTransformation( file.getId() ), repo, true, null, null );
  } else if ( "kjb".equalsIgnoreCase( extension ) ) {
   meta = new JobMeta( convertJob( file.getId() ), repo, null );
  }
 }
 return meta;
}