hbasejavasample-创新互联

通过HBaseAdmin维护表（创建，删除表）
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import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.hbase.HBaseConfiguration; import org.apache.hadoop.hbase.HColumnDescriptor; import org.apache.hadoop.hbase.HTableDescriptor; import org.apache.hadoop.hbase.client.HBaseAdmin; public class CreateHbaseTable { public static void main(String[] args) throws Exception { String tbl = "ericni_test"; Configuration config = HBaseConfiguration. create(); config.set( "hbase.zookeeper.quorum", "xxxx" ); config.set( "hbase.zookeeper.property.clientPort" , "2181" ); HBaseAdmin admin = new HBaseAdmin(config); HTableDescriptor[] tables = admin.listTables(); for(HTableDescriptor t:tables){ System. out.println(t.getNameAsString()); } if (admin.tableExists(tbl.getBytes("utf8" ))) { System. out.println("table already exists!" ); } else { System. out.println("table not already exists!create now!" ); creatTable(admin,tbl,new String[]{ "info"}); } } public static void creatTable(HBaseAdmin admin,String tableName, String[] familys) throws Exception { HTableDescriptor tableDesc = new HTableDescriptor(tableName); for(int i=0; i

2.通过Put写入数据

import java.io.File; import java.io.BufferedReader; import java.io.FileReader; import java.io.IOException; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.hbase.HBaseConfiguration; import org.apache.hadoop.hbase.client.HBaseAdmin; import org.apache.hadoop.hbase.client.HTable; import org.apache.hadoop.hbase.client.Put; import org.apache.hadoop.hbase.util.Bytes; public class LoadDataFromFile { public static void main(String[] args) throws Exception { String tbl = "ericni_test"; String filename = "/tmp/click.log"; File file = new File(filename); BufferedReader reader = null; reader = new BufferedReader(new FileReader(file)); Configuration config = HBaseConfiguration. create(); config.set( "hbase.zookeeper.quorum", "10.100.90.203" ); config.set( "hbase.zookeeper.property.clientPort" , "2181" ); HTable table = new HTable(config, tbl); HBaseAdmin admin = new HBaseAdmin(config); if (admin.tableExists(tbl.getBytes("utf8" ))) { System. out.println("table already exists!" ); try { try { String tmpString = null; int linex = 1; while ((tmpString = reader.readLine()) != null) { //System.out.println(tmpString.getClass()); String[] lines = tmpString.split( "\\t"); //String[] newlines = {lines[0],lines[1],lines[2],lines[3],lines[4]}; //String row = StringUtils.join(new String[] {lines[0],lines[1],lines[2],lines[3],lines[4]}, "_"); StringBuffer sb = new StringBuffer(); String row = sb.append(lines[0]).append("_" ).append(lines[1]).append("_").append(lines[2]).append( "_").append(lines[3]).append("_" ).append(lines[4]).toString(); String valuex = lines[lines. length-1]; System. out.println(row); linex ++; addRecord(table,tbl,row, "Stat", "Click_cnt", valuex); } reader.close(); } catch(IOException err){ err.printStackTrace(); } finally { try{ if(reader != null) reader.close(); } catch(IOException err){ err.printStackTrace(); } } } catch(Exception err){ System. out.println("load data error" ); System. out.println("error log: " + err); err.printStackTrace(); } } else { System. out.println("table not already exists!" ); System. exit(1); } table.close(); admin.close(); } public static void addRecord(HTable table,String tableName, String rowKey, String family, String qualifier, String value) throws Exception{ Put put = new Put(Bytes.toBytes(rowKey)); put.add(Bytes. toBytes(family), Bytes.toBytes(qualifier), Bytes.toBytes(value)); table.put(put); System. out.println("insert recored " + rowKey + " to table " + tableName + " ok." ); } }

3.Scan的Filter操作

import java.io.IOException; import java.util.ArrayList; import java.util.List; import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.hbase.HBaseConfiguration; import org.apache.hadoop.hbase.KeyValue; import org.apache.hadoop.hbase.client.Get; import org.apache.hadoop.hbase.client.HTable; import org.apache.hadoop.hbase.client.Result; import org.apache.hadoop.hbase.client.ResultScanner; import org.apache.hadoop.hbase.client.Scan; import org.apache.hadoop.hbase.filter.FilterList; import org.apache.hadoop.hbase.filter.SingleColumnValueFilter; import org.apache.hadoop.hbase.filter.CompareFilter.CompareOp; import org.apache.hadoop.hbase.util.Bytes; public class FilterTest { private static Configuration config = null; private static HTable table; private static HTable table2; private static HTable table3; static { try { config = HBaseConfiguration.create(); config.set("hbase.zookeeper.quorum" , "xxxxx" ); config.set("hbase.zookeeper.property.clientPort" , "2181" ); } catch (Exception e){ e.printStackTrace(); } } public static void selectByRowKey(String tablename,String rowKey) throws IOException{ table = new HTable(config,tablename); Get g = new Get(Bytes.toBytes(rowKey)); Result r = table.get(g); for(KeyValue kv:r.raw()){ System. out.println("row : " +new String(kv.getRow())); System. out.println("column: " +new String(kv.getKey())); System. out.println("value: " +new String(kv.getValue())); } } public static void selectByRowKeyColumn(String tablename,String rowKey,String column,String qualifier) throws IOException{ table2 = new HTable(config,tablename); Get g = new Get(Bytes.toBytes(rowKey)); g.addColumn(Bytes. toBytes(column),qualifier.getBytes("utf8")); Result r = table2.get(g); for(KeyValue kv:r.raw()){ System. out.println("row : " +new String(kv.getRow())); System. out.println("column: " +new String(kv.getKey())); System. out.println("value: " +new String(kv.getValue())); } } public static void selectByFilter(String tablename,List arr) throws IOException{ table3 = new HTable(config,tablename); FilterList filterList = new FilterList(); Scan s1 = new Scan(); for(String v:arr){ String[] s = v.split( ","); filterList.addFilter( new SingleColumnValueFilter(Bytes.toBytes(s[0]), Bytes.toBytes(s[1]), CompareOp.EQUAL,Bytes.toBytes(s[2]) ) ); s1.addColumn(Bytes. toBytes(s[0]), Bytes.toBytes(s[1])); } s1.setFilter(filterList); ResultScanner ResultScannerFilterList = table3.getScanner(s1); for(Result rr = ResultScannerFilterList.next();rr != null;rr = ResultScannerFilterList.next()){ for(KeyValue kv:rr.list()){ System. out.println("row : " +new String(kv.getRow())); System. out.println("column : " +new String(kv.getKey())); System. out.println("value : " +new String(kv.getValue())); } } } public static void main(String[] args) throws IOException{ //selectByRowKey("ericni_test","102_2.94_1400342400_00426_01132"); //selectByRowKeyColumn("ericni_test","102_2.94_1400342400_00426_01132"," Stat","Click_cnt"); List arr= new ArrayList(); arr.add( "Stat,Click_cnt,1"); selectByFilter("ericni_test" ,arr); } }

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hbasejavasample-创新互联

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