为什么Socket.connect使用SocketAddress而不是InetSocketAddress？
我阅读了Socket.connect的源代码，它只是将SocketAddress转换为InetSocketAddress，如果IllegalArgumentException无法转换为SocketAddress，则会抛出InetSocketAddress package com.npower.scala.test_maven
import scala.xml.include.sax.Main
import org.apache.spark.sql.functions._
import org.apache.spark.sql.hive.HiveContext
import com.databricks.spark.xml._
import org.apache.spark.SparkContext
import org.apache.spark.sql.SQLContext
import org.apache.spark.sql.DataFrame
object HelloWorld {
def main(args: Array[String]): Unit = {
println("Hello World")
//sql context init.
val sc = new SparkContext()
//creating HiveContext
val sql = new SQLContext(sc)
val sqlContext = new HiveContext(sc)
//import sqlContext.implicits._
//reading xml file into dataframe
val df = sqlContext.read.format("com.databricks.spark.xml").option("rowTag", "log-entry").load("file:///home/cloudera/Desktop/alert.log.2018*")
}
}
POM.xml
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.npower.scala</groupId>
<artifactId>test_maven</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>test_maven</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.spark/spark-core -->
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.10</artifactId>
<version>1.6.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.spark/spark-sql -->
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-sql_2.10</artifactId>
<version>1.6.0</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.apache.spark/spark-hive -->
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-hive_2.10</artifactId>
<version>1.6.0</version>
<scope>provided</scope>
</dependency>
<!-- https://mvnrepository.com/artifact/com.databricks/spark-xml -->
<dependency>
<groupId>com.databricks</groupId>
<artifactId>spark-xml_2.10</artifactId>
<version>0.4.1</version>
</dependency>
</dependencies>
</project>
。
我对此感到很困惑。
答案 0 :(得分：2)
基本思想可能是Socket类的未来版本可以支持其他类型的连接。