2,h203");
try{
HTable table = new HTable(config, Bytes.toBytes("student1"));
Scan scan = new Scan();
Filter filter1 = new RowFilter(CompareFilter.CompareOp.EQUAL,new BinaryComparator("a101".getBytes()));
scan.setFilter(filter1);
ResultScanner rst = table.getScanner(scan);
for (Result r:rst){
for (KeyValue kv : r.raw()) {
StringBuffer s1 = new StringBuffer()
.append(Bytes.toString(kv.getRow())).append(":")
.append(Bytes.toString(kv.getFamily())).append(",")
.append(Bytes.toString(kv.getQualifier())).append(",")
.append(Bytes.toString(kv.getValue()));
System.out.println(s1.toString());
}
}
rst.close();
table.close();
} catch(IOException e) {
e.printStackTrace();
}
}
}
1.2
PrefixFilter：筛选出具有特定前缀的行键的数据。这个过滤器所实现的功能其实也可以由RowFilter结合RegexStringComparator来实现，不过这里提供了一种简便的使用方法
import org.apache.hadoop.hbase.filter.PrefixFilter;
Filter filter2 = new PrefixFilter(Bytes.toBytes("a"));
scan.setFilter(filter2);
1.3
RegexComparator 正则过滤
import org.apache.hadoop.hbase.filter.RegexStringComparator;
Filter filter3 = new RowFilter(CompareFilter.CompareOp.EQUAL,new RegexStringComparator("^a.*"));
scan.setFilter(filter3);