hbase安装并且简单的例子

详细过程可以参考林子雨老师

http://dblab.xmu.edu.cn/blog/2442-2/

 

简单的例子

    import org.apache.hadoop.conf.Configuration;
    import org.apache.hadoop.hbase.*;
    import org.apache.hadoop.hbase.client.*;
    import org.apache.hadoop.hbase.util.Bytes;
     
    import java.io.IOException;
    public class ExampleForHBase {
        public static Configuration configuration;
        public static Connection connection;
        public static Admin admin;
        public static void main(String[] args)throws IOException{
            init();
            createTable("student",new String[]{"score"});
            insertData("student","zhangsan","score","English","69");
            insertData("student","zhangsan","score","Math","86");
            insertData("student","zhangsan","score","Computer","77");
            getData("student", "zhangsan", "score","English");
            close();
        }
     
        public static void init(){
            configuration  = HBaseConfiguration.create();
            configuration.set("hbase.rootdir","hdfs://localhost:9000/hbase");
            try{
                connection = ConnectionFactory.createConnection(configuration);
                admin = connection.getAdmin();
            }catch (IOException e){
                e.printStackTrace();
            }
        }
     
        public static void close(){
            try{
                if(admin != null){
                    admin.close();
                }
                if(null != connection){
                    connection.close();
                }
            }catch (IOException e){
                e.printStackTrace();
            }
        }
     
        public static void createTable(String myTableName,String[] colFamily) throws IOException {
            TableName tableName = TableName.valueOf(myTableName);
            if(admin.tableExists(tableName)){
                System.out.println("talbe is exists!");
            }else {
                TableDescriptorBuilder tableDescriptor = TableDescriptorBuilder.newBuilder(tableName);
                for(String str:colFamily){
                    ColumnFamilyDescriptor family = 
    ColumnFamilyDescriptorBuilder.newBuilder(Bytes.toBytes(str)).build();
                    tableDescriptor.setColumnFamily(family);
                }
                admin.createTable(tableDescriptor.build());
            } 
        }
     
        public static void insertData(String tableName,String rowKey,String colFamily,String col,String val) throws IOException { 
            Table table = connection.getTable(TableName.valueOf(tableName));
            Put put = new Put(rowKey.getBytes());
            put.addColumn(colFamily.getBytes(),col.getBytes(), val.getBytes());
            table.put(put);
            table.close(); 
        }
     
        public static void getData(String tableName,String rowKey,String colFamily, String col)throws  IOException{ 
            Table table = connection.getTable(TableName.valueOf(tableName));
            Get get = new Get(rowKey.getBytes());
            get.addColumn(colFamily.getBytes(),col.getBytes());
            Result result = table.get(get);
            System.out.println(new String(result.getValue(colFamily.getBytes(),col==null?null:col.getBytes())));
            table.close(); 
        }
    }