3. Word Count的Java实现 4. Word Count的Python实现 参考 1 导引 我们在博客《Hadoop: 单词计数(Word Count)的MapReduce实现 》中学习了如何用Hadoop-MapReduce实现单词计数,现在我们来看如何用Spark来实现同样的功能。 2. Spark的MapReudce原理 Spark框架也是MapReduce-like模型,采用“分治-聚合”策略来对数据分布...
第一次作业:使用java实现word count github项目地址: https://github.com/changrui520/homework 作业要求: 可执行程序命名为:wc.exe。 该程序处理用户需求的模式为:wc.exe [parameter] [input_file_name] 存储统计结果的文件默认为result.txt,放在与wc.exe相同的目录下。 需求分析: 输入:wc.exe -c file.c ...
主函数的main方法如下: import java.util.List;publicclassMain{publicstaticReadFileCls read;publicstaticWordCount wordCount;publicstaticvoidmain(String[] args){if(args.length >=3) {inti =0;if(args[i].equals("-a") || args[++i].equals("-a")) {intj =1- i;if(args[j].equals("-c")) ...
if(args[j].equals("-c")) outText=outText+"\r\n"+inputFile+",字符数:" + WC.getCharCount(); if(args[j].equals("-w")) outText=outText+"\r\n"+inputFile+",单词数:" + WC.getWordCount(); if(args[j].equals("-l")) outText=outText+"\r\n"+inputFile+",行数:" + WC.g...
hadoop中执行wordcount程序 运行hadoop自带的wordcount,在Hadoop的发行包中也附带了例子的源代码,WordCount.java类的主函数实现如下所示:1.publicstaticvoidmain(String[]args)throws2.intres=ToolRunner.run(newConfiguration(),new3.System.exit(res);4.}
话不多说,直接上代码 List Count public static void main(String[] args) { List<String> list = Arrays.asList("beijing", "shanghai", "guangzhou", "shenzhen", "beijing");...
JavaRDD rdd1 = sc.textFile("/Users/riverfan/mytest/spark/hello.txt"); java.lang.ArrayIndexOutOfBoundsException: 10582 word count 代码实现 main 方法 publicstaticvoidmain(String[]args){SparkConf conf=newSparkConf();conf.setAppName("WordCountDemon");//设置master属性conf.setMaster("local");Ja...
List Word Count publicstaticvoidmain(String[]args){List<String>list=Arrays.asList("beijing shanghai guangzhou","beijing guangzhou","beijing","beijing");Map<String,Long>collect=list.stream().flatMap(o->Stream.of(o.split(" "))).collect(Collectors.groupingBy(o->o,Collectors.counting()));Syst...
WordCounts.java TopWordCounts.java TheWordUtilsclass is a utility class that provides several overloaded static methods for counting words in strings. The central methodcountWordsaccepts a string, a predicate to determine whether a character is a word character, and an optional unary operator to be...
*/publicstaticvoidmain(String[]args)throws Exception{// Storm框架支持多语言,在JAVA环境下创建一个拓扑,需要使用TopologyBuilder进行构建TopologyBuilder builder=newTopologyBuilder();/* WordReader类,主要是将文本内容读成一行一行的模式 * 消息源spout是Storm里面一个topology里面的消息生产者。