java spark文件读取乱码问题的解决方法
更新时间:2024年10月28日 10:35:51 作者:cah黎明就在眼前
这篇文章主要为大家详细介绍了java spark文件读取乱码问题的相关解决方法,文中的示例代码讲解详细,感兴趣的小伙伴可以跟随小编一起学习一下
一、问题
环境为jdk1.8,spark3.2.1,读取hadoop中GB18030编码格式的文件出现乱码。
二、心酸历程
为了解决该问题,尝试过很多种方法,但都没有成功
1、textFile+Configuration方式——乱码
String filePath = "hdfs:///user/test.deflate"; //创建SparkSession和SparkContext的实例 String encoding = "GB18030"; SparkSession spark = SparkSession.builder() .master("local[*]").appName("Spark Example") .getOrCreate(); JavaSparkContext sc = JavaSparkContext.fromSparkContext(spark.sparkContext()); Configuration entries = sc.hadoopConfiguration(); entries.set("textinputformat.record.delimiter", "\n"); entries.set("mapreduce.input.fileinputformat.inputdir",filePath);entries.set("mapreduce.input.fileinputformat.encoding", "GB18030"); JavaRDD<String> rdd = sc.textFile(filePath);
2、spark.read().option方式——乱码
Dataset<Row> load = spark.read().format("text").option("encoding", "GB18030").load(filePath); load.foreach(row -> { System.out.println(row.toString()); System.out.println(new String(row.toString().getBytes(encoding),"UTF-8")); System.out.println(new String(row.toString().getBytes(encoding),"GBK")); });
3、newAPIHadoopFile+Configuration——乱码
JavaPairRDD<LongWritable, Text> longWritableTextJavaPairRDD = sc.newAPIHadoopFile(filePath, TextInputFormat.class, LongWritable.class, Text.class, entries ); System.out.println("longWritableTextJavaPairRDD count ="+longWritableTextJavaPairRDD.count()); longWritableTextJavaPairRDD.foreach(k->{ System.out.println(k._2); });
4、newAPIHadoopFile+自定义类——乱码
JavaPairRDD<LongWritable, Text> longWritableTextJavaPairRDD = sc.newAPIHadoopFile(filePath, GBKInputFormat.class, LongWritable.class, Text.class, entries ); System.out.println("longWritableTextJavaPairRDD count ="+longWritableTextJavaPairRDD.count()); longWritableTextJavaPairRDD.foreach(k->{ System.out.println(k._2); });
代码中GBKInputFormat.class是TextInputFormat.class复制将内部UTF-8修改为GB18030所得
5、newAPIHadoopRDD+自定义类——乱码
JavaPairRDD<LongWritable, Text> longWritableTextJavaPairRDD1 = sc.newAPIHadoopRDD(entries, GBKInputFormat.class, LongWritable.class, Text.class); System.out.println("longWritableTextJavaPairRDD count ="+longWritableTextJavaPairRDD1.count()); longWritableTextJavaPairRDD1.foreach(k->{ System.out.println(k._2()); });
三、最终解决
上述方法感觉指定的字符编码并没有生效不知道为什么,如有了解原因的还请为我解惑,谢谢
最终解决方案如下
JavaPairRDD<LongWritable, Text> longWritableTextJavaPairRDD = sc.newAPIHadoopFile(filePath, TextInputFormat.class, LongWritable.class, Text.class, new Configuration()); System.out.println("longWritableTextJavaPairRDD count ="+longWritableTextJavaPairRDD.count()); longWritableTextJavaPairRDD.foreach(k->{ System.out.println(new String(k._2.copyBytes(), encoding)); }); JavaPairRDD<LongWritable, Text> longWritableTextJavaPairRDD1 = sc.newAPIHadoopRDD(entries, TextInputFormat.class, LongWritable.class, Text.class); System.out.println("longWritableTextJavaPairRDD count ="+longWritableTextJavaPairRDD1.count()); longWritableTextJavaPairRDD1.foreach(k->{ System.out.println(new String(k._2().copyBytes(),encoding)); System.out.println(new String(k._2.copyBytes(),encoding)); });
主要是new String(k._2().copyBytes(),encoding)得以解决
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