spark连接mongodb

1.添加依赖

hadoop和mongodb的连接器

<dependency>
    <groupId>org.mongodb.mongo-hadoop</groupId>
    <artifactId>mongo-hadoop-core</artifactId>
    <version>1.4.2</version>
</dependency>

java连接mongodb连接器

<dependency>
    <groupId>org.mongodb</groupId>
    <artifactId>mongo-java-driver</artifactId>
    <version>2.13.0</version>
</dependency>

2.使用示例

import com.mongodb.hadoop.MongoOutputFormat;
import org.apache.hadoop.conf.Configuration;
import org.apache.spark.api.java.JavaPairRDD;
import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.JavaSparkContext;
import org.apache.spark.api.java.function.Function;
import org.bson.BSONObject;
import scala.Tuple2;

import java.util.Date;
import java.util.List;

/**
 * Created by Administrator on 2015/12/8.
 */
public class ConnectMongo {

    public static void main(String args[]){
        JavaSparkContext sc =new JavaSparkContext("local","test");
        Configuration config =new Configuration();
        //解释 主机：端口号/数据库名.Collection名
        config.set("mongo.input.uri","mongodb://127.0.0.1:27017/lang.sanlu");
        config.set("mongo.output.uri", "mongodb://127.0.0.1:27017/lang.output");
        //读取
        JavaPairRDD<Object, BSONObject> mongoRDD = sc.newAPIHadoopRDD(config, com.mongodb.hadoop.MongoInputFormat.class, Object.class, BSONObject.class);
        //BasonObject-> text
        JavaRDD<text> result = mongoRDD.map(
                new Function<Tuple2<Object, BSONObject>, text>() {
                    public text call(Tuple2<Object, BSONObject> v1) throws Exception {
                        String title = (String) v1._2().get("title");
                        Date date =(Date) v1._2().get("date");
                        List<String> paragraph = (List<String>) v1._2().get("paragraph");
                        return new text(title,date,paragraph);
                    }
                }
        );
        //copy lang.sanlu to lang.output
        mongoRDD.saveAsNewAPIHadoopFile("file:///copy",Object.class, Object.class, MongoOutputFormat.class, config);

    }
}

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