RDD & Java Class (reflection) building Dataframe---java code

Import java.util.List;
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;
 /** * Convert Rdd to Dataframe * 1, custom class must be public * 2, custom class must be serializable * 3, RDD when converted to Dataframe, he sorts according to the field names in the custom class.  * @author ZFG * * */public class Rdd2dataframebyreflection {public static void main (string[] args) {sparkconf conf
		= new sparkconf (). Setmaster ("local"). Setappname ("Rdd2dataframebyreflection");
		Javasparkcontext sc = new Javasparkcontext (conf);
		
		SqlContext sqlcontext = new SqlContext (SC);
		
		Javardd<string> lines = Sc.textfile ("Peoples.txt"); javardd<person> Personsrdd = Lines.map (New function<string, person> () {/** * */Private St

			Atic final Long serialversionuid = 1L; @Override Public person Call (StrinG line) throws Exception {string[] split = Line.split (",");
				Person p = new person ();
				P.setid (Integer.valueof (Split[0].trim ()));
				P.setnam (split[1]);
				P.setage (Integer.valueof (Split[2].trim ()));
			return p;
		
		}
			
		}); When passed into the Person.class, SqlContext is created by reflection in Dataframe///At the bottom by reflection or by all the field of person, combining RDD itself to generate Dataframe dataframe
	 
		DF = Sqlcontext.createdataframe (Personsrdd, Person.class);
		
		
		The name table is named person df.registertemptable ("persontable");
		
		Dataframe resultdataframe = Sqlcontext.sql ("select * from persontable where age > 7");
		
		Resultdataframe.show ();

		Turn DF into rdd javardd<row> Resultrdd = Resultdataframe.javardd (); javardd<person> result = Resultrdd.map (new Function<row, person> () {@Override Public person call (Row R
				 ow) throws Exception {person p = new person ();
				 P.setage (row.getint (0));
				 P.setid (Row.getint (1));
				P.setnam (row.getstring (2));
			return p;
		
		 }
		}); List<person> personlist = Result.collect ();
		for (person person:personlist) {System.out.println (person.tostring ());
  } 
	}
}