Hbase 过滤器的使用

          Filter filter=  new RowFilter(CompareFilter.CompareOp.EQUAL,new RegexStringComparator("."+day));//任意以day结尾的row
           Filter filter=   new RowFilter(CompareFilter.CompareOp.EQUAL, new SubstringComparator(day)); //包含给定字符串的row

 根据前缀进行那一天的查询
     */
        public Map<String,Long>  prefixQuery(String tableName,String day){
        Map<String,Long> map=new HashMap<>();
       HTable table= getTable(tableName);
       Scan scan=new Scan();
//        Filter filter=new PrefixFilter(Bytes.toBytes(day));
            Filter filter=  new RowFilter(CompareFilter.CompareOp.EQUAL,new RegexStringComparator("."+day));//任意以day结尾的row
           // Filter filter=   new RowFilter(CompareFilter.CompareOp.EQUAL, new SubstringComparator(day)); //包含给定字符串的row
        scan.setFilter(filter);
        try {
           ResultScanner rs= table.getScanner(scan);
           for (Result result:rs){

               String row=Bytes.toString(result.getRow());
               /*
读取的同时会映射为对象，对象其中的一个成员为：
    @HBaseColumn(qualifier = "logCount", isKpi = true, defaultFuncName = MeasureAggregator.FUNC_SUM)
    public Long logCount;                //广告展示次数
然而，scan数据为：
总结，就是希望读取的内容格式是Long，而实际上存储的形式确是String。所以会出现读取异常的错误。
                */
               long value= Long.parseLong(Bytes.toString(result.getValue(Bytes.toBytes("info"),Bytes.toBytes("accountNum"))));

               map.put(row,value);
           }
        } catch (IOException e) {
            e.printStackTrace();
        }
    return  map;
    }