java public class DynamicDemo { private static SparkConf conf = new SparkConf().setAppName("dynamicdemo").setMaster("local"); private static JavaSparkContext jsc = new JavaSparkContext(conf); private static SparkSession session = new S…

java public class ReflectionDemo { private static SparkConf conf = new SparkConf().setAppName("reflectdemo").setMaster("local"); private static JavaSparkContext jsc = new JavaSparkContext(conf); private static SparkSession session = ne…

依赖 <dependency> <groupId>org.apache.spark</groupId> <artifactId>spark-sql_2.11</artifactId> <version>2.1.3</version> </dependency> RDD转化成DataFrame:通过StructType指定schema package com.zy.sparksql import org.apac…

官方提供了2种方法 1.利用反射来推断包含特定类型对象的RDD的schema.这种方法会简化代码并且在你已经知道schema的时候非常适用. 先创建一个bean类 case class Person(name: String, age: Int) 然后将Rdd转换成DataFrame val people = sc.textFile("examples/src/main/resources/people.txt").map(_.split(",")).map(p =…

#region 接口返回的Xml转换成DataSet /// <summary> /// 返回的Xml转换成DataSet /// </summary> /// <param name="text">Xml字符</param> /// <returns></returns> private DataSet GetDataSet(string text) { try { XmlTextReader reader =…

/// <summary> /// TXT文件转换成DataSet数据集 /// </summary> /// <param name="FilePath"></param> /// <param name="TableName"></param> /// <returns></returns> private DataSet TextFileLoader(string…

/// <summary>         /// List<T> 转换成DataSet         /// </summary>         /// <typeparam name="T">对象</typeparam>         /// <param name="list">集合</param>         /// <returns>DataSet&l…

一:准备数据源     在项目下新建一个student.txt文件,里面的内容为: ,zhangsan, ,lisi, ,wanger, ,fangliu, 二:实现 Java版: 1.首先新建一个student的Bean对象,实现序列化和toString()方法,具体代码如下: import java.io.Serializable; @SuppressWarnings("serial") public class Student implements Serializable {…

工具   选项   文本编辑器    如下图  选中插入空格 使用技巧: 按Ctrl+K+F组合键,可以自动进行代码对齐.…

XmlDocument xml = new XmlDocument();xml.LoadXml(str); //str:具有xml格式的字符串 XmlNodeReader reader = new XmlNodeReader(xml);DataSet ds = new DataSet();ds.ReadXml(reader);…