Hadoop之——Java操作HBase

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不多说，直接上代码，大家都懂得

package hbase;import java.io.IOException;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.TableDescriptors;import org.apache.hadoop.hbase.client.Get;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.client.Result;import org.apache.hadoop.hbase.client.ResultScanner;import org.apache.hadoop.hbase.client.Scan;/** * Java操作HBase * @author liuyazhuang */public class HBaseApp {//创建表、插入记录、查询一条记录、遍历所有的记录、删除表public static final String TABLE_NAME = "table1";public static final String FAMILY_NAME = "family1";public static final String ROW_KEY = "rowkey1";public static void main(String[] args) throws Exception {Configuration conf = HBaseConfiguration.create();conf.set("hbase.rootdir", "hdfs://hadoop0:9000/hbase");//使用eclipse时必须添加这个，否则无法定位conf.set("hbase.zookeeper.quorum", "hadoop0");//创建表、删除表使用HBaseAdminfinal HBaseAdmin hBaseAdmin = new HBaseAdmin(conf);createTable(hBaseAdmin);//插入记录、查询一条记录、遍历所有的记录HTablefinal HTable hTable = new HTable(conf, TABLE_NAME);//putRecord(hTable);//getRecord(hTable);//scanTable(hTable);hTable.close();//deleteTable(hBaseAdmin);}//扫描表记录private static void scanTable(final HTable hTable) throws IOException {Scan scan = new Scan();final ResultScanner scanner = hTable.getScanner(scan);for (Result result : scanner) {final byte[] value = result.getValue(FAMILY_NAME.getBytes(), "age".getBytes());System.out.println(result+"\t"+new String(value));}}//获取记录private static void getRecord(final HTable hTable) throws IOException {Get get = new Get(ROW_KEY.getBytes());final Result result = hTable.get(get);final byte[] value = result.getValue(FAMILY_NAME.getBytes(), "age".getBytes());System.out.println(result+"\t"+new String(value));}//插入记录private static void putRecord(final HTable hTable) throws IOException {Put put = new Put(ROW_KEY.getBytes());put.add(FAMILY_NAME.getBytes(), "age".getBytes(), "25".getBytes());hTable.put(put);}//删除表private static void deleteTable(final HBaseAdmin hBaseAdmin)throws IOException {hBaseAdmin.disableTable(TABLE_NAME);hBaseAdmin.deleteTable(TABLE_NAME);}//创建表private static void createTable(final HBaseAdmin hBaseAdmin)throws IOException {if(!hBaseAdmin.tableExists(TABLE_NAME)){HTableDescriptor tableDescriptor = new HTableDescriptor(TABLE_NAME);HColumnDescriptor family = new HColumnDescriptor(FAMILY_NAME);tableDescriptor.addFamily(family);hBaseAdmin.createTable(tableDescriptor);}}}

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