在Scala中：

# register udf

spark.udf
  .register("get_only_file_name", (fullPath: String) => fullPath.split("/").last)

# use the udf to get last token(filename) in full path

val initialDs = spark.read
  .option("dateFormat", conf.dateFormat)
  .schema(conf.schema)
  .csv(conf.path)
  .withColumn("input_file_name", get_only_file_name(input_file_name))

编辑：在Java中根据评论

# register udf

spark.udf()
  .register("get_only_file_name", (String fullPath) -> {
     int lastIndex = fullPath.lastIndexOf("/");
     return fullPath.substring(lastIndex, fullPath.length - 1);
    }, DataTypes.StringType);

import org.apache.spark.sql.functions.input_file_name    

# use the udf to get last token(filename) in full path

Dataset<Row> initialDs = spark.read()
  .option("dateFormat", conf.dateFormat)
  .schema(conf.schema)
  .csv(conf.path)
  .withColumn("input_file_name", get_only_file_name(input_file_name()));

借用相关问题here，下面的方法更可移植，不需要自定义UDF。

Spark SQL代码片段：reverse(split(path, '/'))[0]
Spark SQL示例：

WITH sample_data as (
SELECT 'path/to/my/filename.txt' AS full_path
)
SELECT
      full_path
    , reverse(split(full_path, '/'))[0] as basename
FROM sample_data

解释：split()函数将路径分成块，reverse()将最后一项(文件名)放在数组前面，以便[0]可以只提取文件名。

以下是完整的代码示例：

spark.sql(
    """
      |WITH sample_data as (
      |    SELECT 'path/to/my/filename.txt' AS full_path
      |  )
      |  SELECT
      |  full_path
      |  , reverse(split(full_path, '/'))[0] as basename
      |  FROM sample_data
      |""".stripMargin).show(false)

结果：

+-----------------------+------------+
|full_path              |basename    |
+-----------------------+------------+
|path/to/my/filename.txt|filename.txt|
+-----------------------+------------+

• Commons io*是Spark Means中的自然/最简单的导入(不需要添加额外的依赖...)

import org.apache.commons.io.FilenameUtils

getBaseName(String fileName)

• 从完整文件名中获取基本名称，减去完整路径和扩展名。*

val baseNameOfFile = udf((longFilePath: String) => FilenameUtils.getBaseName(longFilePath))

用法是这样的..。

yourdataframe.withColumn("shortpath" ,baseNameOfFile(yourdataframe("input_file_name")))
.show(1000,false)