JAVA反射创建DataFrame（方式一，已知数据类型）

package sparkSql.方法1创建DataFrame;

import org.apache.spark.SparkConf;
import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.api.java.function.Function;
import org.apache.spark.sql.DataFrame;
import org.apache.spark.sql.Row;
import org.apache.spark.sql.SQLContext;

import java.util.List;

/**
 * @description
 * @author: 123.com
 * @create: 2019-02-25 21:07:42
 * 反射方式创建rdd
 * 此种方式创建DataFrame需要指定数据源类型
 **/

public class StuJavaClass {
    public static void main(String[] args) {
        SparkConf conf = new SparkConf().setAppName("java").setMaster("local");
        JavaSparkContext jsc = new JavaSparkContext(conf);
        SQLContext sqlContext = new SQLContext(jsc);
        JavaRDD<String> javaRDD = jsc.textFile("C:\\Program Files\\feiq\\Recv Files\\day11-Spark SQL\\students.txt");

        JavaRDD<StudentModel> javaRDD1 = javaRDD.map(new Function<String, StudentModel>() {
            @Override
            public StudentModel call(String s) throws Exception {
                String[] split = s.split(",");
                StudentModel model = new StudentModel();
                model.setId(Integer.valueOf(split[0]));
                model.setAge(Integer.valueOf(split[2]));
                model.setName(split[1]);
                return model;
            }
        });
        DataFrame dataFrame = sqlContext.createDataFrame(javaRDD1, StudentModel.class);
//        dataFrame.show();
        //注册一个中间表 并且赋值表明
        dataFrame.registerTempTable("tmp");
        //针对表进行查询
        DataFrame sql = sqlContext.sql("select * from tmp where age < 18");

        //DataFrame转成RDD
        JavaRDD<Row> rowJavaRDD = sql.javaRDD();
        //将数据存储到实体类中 并且展示
        JavaRDD<StudentModel> map = rowJavaRDD.map(new Function<Row, StudentModel>() {
            @Override
            public StudentModel call(Row row) throws Exception {
                StudentModel stu = new StudentModel();
                stu.setId(row.getInt(1));
                stu.setAge(row.getInt(0));
                stu.setName(row.getString(2));
                return stu;
            }
        });
        List<StudentModel> collect = map.collect();
        for (StudentModel s : collect){
            System.out.println(s.getId()+" "+s.getAge()+" "+s.getName());
        }
        //        sql.show();
    }
}

<?xml version="1.0" encoding="UTF-8"?>
<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.qf</groupId>
    <artifactId>hz1802</artifactId>
    <version>1.0-SNAPSHOT</version>
    <properties>
        <maven.compiler.source>1.8</maven.compiler.source>
        <maven.compiler.target>1.8</maven.compiler.target>
        <encoding>UTF-8</encoding>
        <scala.version>2.10.6</scala.version>
        <spark.version>1.6.3</spark.version>
        <hadoop.version>2.6.4</hadoop.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.scala-lang</groupId>
            <artifactId>scala-library</artifactId>
            <version>${scala.version}</version>
        </dependency>

        <dependency>
            <groupId>com.typesafe.akka</groupId>
            <artifactId>akka-actor_2.10</artifactId>
            <version>2.3.14</version>
        </dependency>

        <dependency>
            <groupId>com.typesafe.akka</groupId>
            <artifactId>akka-remote_2.10</artifactId>
            <version>2.3.14</version>
        </dependency>

        <dependency>
            <groupId>org.apache.spark</groupId>
            <artifactId>spark-core_2.10</artifactId>
            <version>${spark.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.spark</groupId>
            <artifactId>spark-sql_2.10</artifactId>
            <version>${spark.version}</version>
        </dependency>
        <dependency>
            <groupId>org.apache.hadoop</groupId>
            <artifactId>hadoop-client</artifactId>
            <version>${hadoop.version}</version>
        </dependency>

    </dependencies>

    <build>
        <sourceDirectory>src/main/spark</sourceDirectory>
        <plugins>
            <plugin>
                <groupId>net.alchim31.maven</groupId>
                <artifactId>scala-maven-plugin</artifactId>
                <version>3.2.2</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>compile</goal>
                            <goal>testCompile</goal>
                        </goals>
                        <configuration>
                            <args>
                                <arg>-dependencyfile</arg>
                                <arg>${project.build.directory}/.scala_dependencies</arg>
                            </args>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <version>2.4.3</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                        <configuration>
                            <filters>
                                <filter>
                                    <artifact>*:*</artifact>
                                    <excludes>
                                        <exclude>META-INF/*.SF</exclude>
                                        <exclude>META-INF/*.DSA</exclude>
                                        <exclude>META-INF/*.RSA</exclude>
                                    </excludes>
                                </filter>
                            </filters>
                            <transformers>
                                <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                    <mainClass></mainClass>
                                </transformer>
                            </transformers>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

</project>