offset (0) + length (8) exceed the capacity of the array: 1

Question

package com.yys.spark.yys_web.utils;import org.apache.hadoop.conf.Configuration;import org.apache.hadoop.hbase.client.*;import org.apache.hadoop.hbase.filter.Filter;import org.apache.hadoop.hbase.filter.PrefixFilter;import org.apache.hadoop.hbase.util.Bytes;import java.io.IOException;import java.util.HashMap;import java.util.Map;/** * HBase操作工具类 */public class HBaseUtils {    HBaseAdmin admin = null;    Configuration conf = null;    /**     * 私有构造方法：加载一些必要的参数     */    private HBaseUtils() {        conf = new Configuration();        conf.set("hbase.zookeeper.quorum", "spark:2181");        conf.set("hbase.rootdir", "hdfs://spark:9000/hbase");        try {            admin = new HBaseAdmin(conf);        } catch (IOException e) {            e.printStackTrace();        }    }    private static HBaseUtils instance = null;    public static synchronized HBaseUtils getInstance() {        if (null == instance) {            instance = new HBaseUtils();        }        return instance;    }    /**     * 根据表名获取到HTable实例     */    public HTable getTable(String tableName) {        HTable table = null;        try {            table = new HTable(conf, tableName);        } catch (IOException e) {            e.printStackTrace();        }        return table;    }    /**     * 根据表名和输入条件获取HBase的记录数     */    public Map<String, Long> query(String tableName, String condition) throws Exception {        Map<String, Long> map = new HashMap<>();        HTable table = getTable(tableName);        String cf = "info";        String qualifier = "click_count";        Scan scan = new Scan();        Filter filter = new PrefixFilter(Bytes.toBytes(condition));        scan.setFilter(filter);        ResultScanner rs = table.getScanner(scan);        for(Result result : rs) {            String row = Bytes.toString(result.getRow());            long clickCount = Bytes.toLong(result.getValue(cf.getBytes(), qualifier.getBytes()));            map.put(row, clickCount);        }        return  map;    }    public static void main(String[] args) throws Exception {        Map<String, Long> map = HBaseUtils.getInstance().query("yys_course_clickcount" , "20180220");        for(Map.Entry<String, Long> entry: map.entrySet()) {            System.out.println(entry.getKey()+ " : " + entry.getValue());        }    }}

Answer 1

cf.getBytes()--->Bytes.toBytes(cf)

or 

long clickCount--->String clickCount

or 

文件中含有有null值？？