java Spark：如何使用标题保存数据帧？
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Spark: How to save a dataframe with headers?
提问by user3897533
dataframe.saveasTextFile, saves only the data in a delimited format. How do I save the dataframe with headers in JAVA.
dataframe.saveasTextFile, 仅以分隔格式保存数据。如何在 JAVA 中保存带有标题的数据帧。
sourceRufFrame.toJavaRDD().map(new TildaDelimiter()).coalesce(1, true).saveAsTextFile(targetSrcFilePath);
回答by Srini
If you want to save as csv file, i would suggest using spark-csvpackage. You can save your dataframe simply with spark-csvas below with header.
如果你想保存为 csv 文件，我建议使用spark-csvpackage.json 。您可以spark-csv使用标题简单地保存您的数据框，如下所示。
dataFrame.write
.format("com.databricks.spark.csv")
.option("header", "true")
.option("delimiter",<your delimiter>)
.save(output)
You can refer below link, for further information: https://github.com/databricks/spark-csv
您可以参考以下链接，了解更多信息：https: //github.com/databricks/spark-csv
Spark-csvhas maven dependency.
Spark-csv有 maven 依赖。
回答by Chitral Verma
With Spark 2.x,
使用 Spark 2.x，
df.write.option("header", "true").csv("path")
Cheers
干杯
