本文最后更新于：10 个月前

今天教大家配置一个IDEA的环境，以及如何新建一个工程，废话不多说，搞起来
20200707225051-2020-07-07

1.下载IDEA

这里推荐一个微信公众号软件安装管家,关注后给它发送软件名，像下面这样：
Screenshot_2020-07-07-23-03-07-21-2020-07-07

选择一个最新的版本，最好是英文版
ps:IDEA已经有2020版，想要最新版的可以去官网下载再百度破解方法
点进去之后，就可以看到百度网盘的链接以及安装方法，写的很详细，所以我这里就不再赘述了

Screenshot_2020-07-07-23-06-13-08-2020-07-07

2.新建工程

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3.添加scala文件夹

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4.添加scala SDK

ps：为了版本匹配，不是对工程很了解的同学尽量下载~~2.10.4~~ 2.12.10，后面我添加的依赖都是这个版本
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如果没有这个选项的话，要先安装Scala插件

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5.修改工程目录

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6.设置settings.xml文件

ps:有些同学是 Create ‘settings.xml’
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把你原先的settings.xml的内容删掉，替换成下面这段

<?xml version="1.0" encoding="UTF-8"?>
<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0"
          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 http://maven.apache.org/xsd/settings-1.0.0.xsd">

  <pluginGroups />
  <proxies />
  <servers />

  <localRepository>D:/server/maven/repository</localRepository>

  <mirrors>
    <mirror>
      <id>alimaven</id>
      <mirrorOf>central</mirrorOf>
      <name>aliyun maven</name>
      <url>http://maven.aliyun.com/nexus/content/repositories/central/</url>
    </mirror>
    <mirror>
      <id>alimaven</id>
      <name>aliyun maven</name>
      <url>http://maven.aliyun.com/nexus/content/groups/public/</url>
      <mirrorOf>central</mirrorOf>
    </mirror>
    <mirror>
      <id>central</id>
      <name>Maven Repository Switchboard</name>
      <url>http://repo1.maven.org/maven2/</url>
      <mirrorOf>central</mirrorOf>
    </mirror>
    <mirror>
      <id>repo2</id>
      <mirrorOf>central</mirrorOf>
      <name>Human Readable Name for this Mirror.</name>
      <url>http://repo2.maven.org/maven2/</url>
    </mirror>
    <mirror>
      <id>ibiblio</id>
      <mirrorOf>central</mirrorOf>
      <name>Human Readable Name for this Mirror.</name>
      <url>http://mirrors.ibiblio.org/pub/mirrors/maven2/</url>
    </mirror>
    <mirror>
      <id>jboss-public-repository-group</id>
      <mirrorOf>central</mirrorOf>
      <name>JBoss Public Repository Group</name>
      <url>http://repository.jboss.org/nexus/content/groups/public</url>
    </mirror>
    <mirror>
      <id>google-maven-central</id>
      <name>Google Maven Central</name>
      <url>https://maven-central.storage.googleapis.com
      </url>
      <mirrorOf>central</mirrorOf>
    </mirror>
    <!-- 中央仓库在中国的镜像 -->
    <mirror>
      <id>maven.net.cn</id>
      <name>oneof the central mirrors in china</name>
      <url>http://maven.net.cn/content/groups/public/</url>
      <mirrorOf>central</mirrorOf>
    </mirror>
  </mirrors>
</settings>

7.设置pom.xml文件

在</project>前面添加下面这段：

<dependencies>
    <dependency>
        <groupId>org.scala-lang</groupId>
        <artifactId>scala-library</artifactId>
        <version>2.12.10</version>
    </dependency>

    <dependency>
        <groupId>org.apache.spark</groupId>
        <artifactId>spark-core_2.12</artifactId>
        <version>3.0.0</version>
    </dependency>

    <dependency>
        <groupId>org.apache.spark</groupId>
        <artifactId>spark-sql_2.12</artifactId>
        <version>3.0.0</version>
    </dependency>

    <dependency>
        <groupId>org.scalanlp</groupId>
        <artifactId>breeze_2.12</artifactId>
        <version>1.0</version>
    </dependency>

    <dependency>
        <groupId>org.scalanlp</groupId>
        <artifactId>breeze-viz_2.12</artifactId>
        <version>1.0</version>
    </dependency>

    <dependency>
        <groupId>commons-io</groupId>
        <artifactId>commons-io</artifactId>
        <version>2.4</version>
    </dependency>

</dependencies>

添加完点这个按键刷新
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8.新建Scala项目

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写一段简单的代码示范一下

1. 创建一个test文件
  
  随便写一点测试数据

写一段简单的画图代码

import breeze.plot.{Figure, plot}
import org.apache.spark.{SparkConf, SparkContext}

object test {
  def main(args: Array[String]): Unit = {
    val conf = new SparkConf().setMaster("local[*]").setAppName("test")
    val sc = new SparkContext(conf)
    val rdd1 = sc.textFile("test")
    val rdd2 = rdd1.map(_.split(" "))//空格切分
    val rdd3 = rdd2.map(x=>(x(0),x(1),x(2)))//取出第一列、第二列、第三列数据
    /**
     * collect可以将列向的RDD转为数组
     * plot画图要求横纵坐标都为数字类型，所以要toDouble
     */
    val x_zhou = rdd3.map(x=>x._1.toDouble).collect()
    val y1_zhou = rdd3.map(x=>x._2.toDouble).collect()
    val y2_zhou = rdd3.map(x=>x._3.toDouble).collect()
    /**
     * 1.在一个坐标上画两条线
     */
    val f = Figure()
    val p = f.subplot(0)
    p += plot(x_zhou, y1_zhou,colorcode = "red")
    p += plot(x_zhou, y2_zhou,colorcode = "blue")
    p.xlabel = "x axis"
    p.ylabel = "y axis"
    f.saveas("d:\\test1.png")

    /**
     * 2.在一张图两个坐标上画两条线
     */
    val p2 = f.subplot(2, 1, 1)//两行一列的第二个坐标
    p2 += plot(x_zhou, y1_zhou,colorcode = "black")
    f.saveas("d:\\test2.png")

  }
}