需求征集系统开发第一天

　　今天完成了HBase的配置，实现了通过javaweb来操作HBase数据库，此外决定重构系统原型，使用Bootstrap开发自己的UI模型，进行了主页的简单布局设置。

package utils;

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.client.*;
import org.apache.hadoop.hbase.*;

import org.apache.hadoop.hbase.util.Bytes;
import java.io.IOException;

public class HBaseUtils {
    public static Configuration configuration;
    public static Connection connection;
    public static Admin admin;


    //建立连接
    public static void init(){
            //configuration= new Configuration();
             configuration  = HBaseConfiguration.create();
            configuration.set("hbase.rootdir","hdfs://note1:8020/hbase");
            configuration.set("hbase.zookeeper.quorum","note1,note2,note3");
            configuration.set("hbase.zookeeper.property.dataDir","/export/server/zookeeper-3.4.9/zkdatas");
        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();
        }

    }

    //创建表
    public static void createTable(String myTableName,String[] colFamily) throws IOException {
        TableName tableName=TableName.valueOf(myTableName);
        if (admin.tableExists(tableName)){
            System.out.println("表已经存在");
            return;
        }else{
            HTableDescriptor hTableDescriptor = new HTableDescriptor(tableName);
            for(String str: colFamily) {
                HColumnDescriptor hColumnDescriptor = new HColumnDescriptor(str);
                hTableDescriptor.addFamily(hColumnDescriptor);
            }
            admin.createTable(hTableDescriptor);
        }
    }

    //插入数据
    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(Bytes.toBytes(rowKey));
        put.addColumn(Bytes.toBytes(colFamily), Bytes.toBytes(col), Bytes.toBytes(val));
        table.put(put);
        table.close();
    }

    //浏览数据
    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(Bytes.toBytes(rowKey));
        get.addColumn(Bytes.toBytes(colFamily),Bytes.toBytes(col));
        //获取的result数据是结果集，还需要格式化输出想要的数据才行
        Result result = table.get(get);
        System.out.println(new String(result.getValue(colFamily.getBytes(),col==null?null:col.getBytes())));
        table.close();
    }

}

上面是操作HBase的核心代码