统计表的行数。

import java.io.IOException;


public class E_getTableRowSum {
    public static Configuration configuration;
    public static Connection connection;
    public static Admin admin;
    
    /**
     * @param args
     * @throws IOException 
     */
    public static void main(String[] args) throws IOException {
        // TODO Auto-generated method stub
        getTableRows("student");
    }
    //建立连接
    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();
        }
    }
    //关闭连接
    public static void close(){
        try{
            if(admin != null){
                admin.close();
            }
            if(null != connection){
                connection.close();
            }
        }catch (IOException e){
            e.printStackTrace();
        }
    }
    /*
     * E_
     */
    public static void getTableRows(String tablename) throws IOException {
        init();
        HTableDescriptor hTableDescriptors[] = admin.listTables();
        System.out.println("tablename:"+tablename);
        Table table = connection.getTable(TableName.valueOf(tablename));
        //创建一个空的Scan实例
        Scan scan1 = new Scan();
        //在行上获取遍历器
        ResultScanner scanner1 = table.getScanner(scan1);
        int count_rows=0;
        for (Result res : scanner1) {
            System.out.println(res);
            Cell[] cells = res.rawCells();
            for(Cell cell:cells){
                count_rows+=1;
            }
        }
        //关闭释放资源
        System.out.println("count_rows:"+count_rows);
        scanner1.close();
        table.close();
        close();
    }

}