大三上寒假15天--第4天

继昨天

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 大数据原理与应用 第十六章 Spark 学习指南

今天进行Java独立应用编程

1.安装maven

1. sudo unzip ~/下载/apache-maven-3.3.9-bin.zip -d /usr/local
2. cd /usr/local
3. sudo mv apache-maven-3.3.9/ ./maven
4. sudo chown -R hadoop ./maven

2.Java应用程序代码

1. cd ~ #进入用户主文件夹
2. mkdir -p ./sparkapp2/src/main/java
3. vim ./sparkapp2/src/main/java/SimpleApp.java，并插入如下

   /*** SimpleApp.java ***/
   import org.apache.spark.api.java.*;
   import org.apache.spark.api.java.function.Function;
    
   public class SimpleApp {
       public static void main(String[] args) {
           String logFile = "file:///usr/local/spark/README.md"; // Should be some file on your system
           JavaSparkContext sc = new JavaSparkContext("local", "Simple App",
               "file:///usr/local/spark/", new String[]{"target/simple-project-1.0.jar"});
           JavaRDD<String> logData = sc.textFile(logFile).cache();
    
           long numAs = logData.filter(new Function<String, Boolean>() {
               public Boolean call(String s) { return s.contains("a"); }
           }).count();
    
           long numBs = logData.filter(new Function<String, Boolean>() {
               public Boolean call(String s) { return s.contains("b"); }
           }).count();
    
           System.out.println("Lines with a: " + numAs + ", lines with b: " + numBs);
       }
   }
   

    4.vim ./sparkapp2/pom.xml 并加入如下：

   <project>
       <groupId>edu.berkeley</groupId>
       <artifactId>simple-project</artifactId>
       <modelVersion>4.0.0</modelVersion>
       <name>Simple Project</name>
       <packaging>jar</packaging>
       <version>1.0</version>
       <repositories>
           <repository>
               <id>Akka repository</id>
               <url>http://repo.akka.io/releases</url>
           </repository>
       </repositories>
       <dependencies>
           <dependency> <!-- Spark dependency -->
               <groupId>org.apache.spark</groupId>
               <artifactId>spark-core_2.11</artifactId>
               <version>2.0.0-preview</version>
           </dependency>
       </dependencies>
   </project>

 3.使用maven打包java程序

1. cd ~/sparkapp2
2. find
3. /usr/local/maven/bin/mvn package  又开始下载了，无语。。。。