在IDEA14中使用代码连接Hbase，

在IDEA14中使用代码连接Hbase，

环境准备：我用的是Hadoop2.4.0以及Hbase0.98.15，首先保证hadoop和hbase已经安装并且环境配置完成。

新建一个maven工程，如图：

什么都不勾选，直接选next，然后根据自己的喜好写一个名字：

next，然后给工程起一个名字，finish

好，工程创建完成

接下来，打开pom.xml添加hbase需要的依赖，添加如下三段代码：

 <repositories>
        <repository>
            <id>cloudera</id>
            <url>https://repository.cloudera.com/artifactory/cloudera-repos</url>
        </repository>
    </repositories>

    <dependencies>


    <dependency>
        <groupId>org.apache.hbase</groupId>
        <artifactId>hbase</artifactId>
        <version>0.98.1-cdh5.1.5</version>
    </dependency>


    <dependency>
        <groupId>org.apache.hbase</groupId>
        <artifactId>hbase-client</artifactId>
        <version>0.98.1-cdh5.1.5</version>
    </dependency>
    </dependencies>

然后maven自动开始下载

下载成功后，在src/main/java目录下新建一个java文件：

HBaseTestCase，代码如下：

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.*;
import org.apache.hadoop.hbase.util.Bytes;

import java.io.IOException;

public class HBaseTestCase {

    static Configuration cfg = HBaseConfiguration.create();
    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        String tablename = "priceforcity";   // 创建表名
        String columnFamily = "base";     //创建列族
        try {
            HBaseTestCase.create(tablename, columnFamily);
            HBaseTestCase.put(tablename, "row1", columnFamily, "price", "3000");
            HBaseTestCase.get(tablename, "row1");
            HBaseTestCase.scan(tablename);
//            if(true==HBaseTestCase.delete(tablename)) {
//                System.out.println("Delete table:"+tablename+" success!");
//            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


    }

    /**
     * create a table :table_name(columnFamily)
     * @param tablename
     * @param columnFamily
     * @throws Exception
     */
    public static void create(String tablename, String columnFamily) throws Exception {
        HBaseAdmin admin = new HBaseAdmin(cfg);
        if(admin.tableExists(tablename)) {
            System.out.println("table exists!");
            System.exit(0);
        }
        else {
            HTableDescriptor tableDesc = new HTableDescriptor(tablename);
            tableDesc.addFamily(new HColumnDescriptor(columnFamily));
            admin.createTable(tableDesc);
            System.out.println("create table success!");
        }
    }

    /**
     * put a row data into table
     * @param tablename
     * @param row
     * @param columnFamily
     * @param column
     * @param data
     * @throws Exception
     */
    public static void put(String tablename, String row, String columnFamily, String column, String data) throws Exception{
        HTable table = new HTable(cfg, tablename);
        Put p1 = new Put(Bytes.toBytes(row));
        p1.add(Bytes.toBytes(columnFamily), Bytes.toBytes(column), Bytes.toBytes(data));
        table.put(p1);
        System.out.println("put '"+row+"', '"+columnFamily+":"+column+"', '"+data+"'");

    }

    /**
     * get a row data from a table
     * @param tablename
     * @param row
     * @throws Exception
     */
    public static void get(String tablename, String row) throws Exception {
        HTable table = new HTable(cfg, tablename);
        Get get = new Get(Bytes.toBytes(row));
        Result result = table.get(get);
        System.out.println("Get: "+result);
    }

    /**
     * show all data from a table
     * @param tablename
     * @throws Exception
     */
    public static void scan(String tablename) throws Exception {
        HTable table = new HTable(cfg, tablename);
        Scan s =new Scan();
        ResultScanner rs = table.getScanner(s);
        for(Result r:rs) {
            System.out.println("Scan: "+r);
        }
    }

    /**
     * delete a table's data
     * @param tablename
     * @return
     * @throws IOException
     */
    public static boolean delete(String tablename) throws IOException {
        HBaseAdmin admin = new HBaseAdmin(cfg);
        if(admin.tableExists(tablename)) {
            try {
                admin.disableTable(tablename);
                admin.deleteTable(tablename);
            } catch (Exception e) {
                // TODO: handle exception
                e.printStackTrace();
                return false;
            }
        }
        return true;
    }
}

然后运行main方法，输出如下信息：

好啦，hbase正常运行，大功告成！！