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首先确定hbase与Hdoop版本一致,网上都能查,我的是hadoop2.6.0+hbase1.0.0安装配置好后,明确了在终端命令行下面可以对数据库进行操作
然后对eclipse开发环境进行配置:
1.从HBase集群中复制一份Hbase部署文件,放置在开发端某一目录下(如在/home/hadoop/hbase目录下)。
2.在eclipse里新建一个java项目qin,然后选择项目属性,右键build path——>configure build path,在Libraries->Add External JARs...,然后选择/home/hadoop/hbase/lib下相关的JAR包,如果只是测试用的话,就简单一点,将所有的JAR选上。
3:在项目qin下增加一个文件夹conf(对准项目右键new->folder),将Hbase集群的配置文件hbase-site.xml复制到该目录(直接在eclipse的workspace下找到qin的文件夹复制粘贴,在eclipse中刷新),然后选择项目属性(右键build path——>configure build path)在Libraries->Add Class Folder,将刚刚增加的conf目录选上。
4.然后和建立普通的eclipse项目一样,新建class,码代码;
package qin;import java.io.IOException;//import java.util.Map;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.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;import org.apache.hadoop.hbase.util.Bytes;public class yin {//声明静态HBaseConfiguration static Configuration cfg=HBaseConfiguration.create(); 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{ @SuppressWarnings("deprecation") HTableDescriptor tableDesc =new HTableDescriptor(tablename); tableDesc.addFamily(new HColumnDescriptor(columnFamily)); admin.createTable(tableDesc); System.out.println("create table success!"); } } public static void put(String tablename,String row,String columnFamily,String column,String data) throws IOException{ 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+"'"); } public static void get(String tablename,String row)throws IOException{ HTable table=new HTable(cfg,tablename); Get g=new Get(Bytes.toBytes(row)); Result result=table.get(g); System.out.println("Get:"+result); } 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); } } 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 ex){ ex.printStackTrace(); return false; } } return true; } public static void main(String [] args){ String tablename="hbase_tb"; String columnFamily="cf"; try{ yin.create(tablename,columnFamily); yin.put(tablename, "row1", columnFamily, "cl1", "data"); yin.get(tablename,"row1"); yin.scan(tablename); /* if(true==yin.delete(tablename)){ System.out.println("Delete table:"+tablename+"success!"); }*/ }catch(Exception e){ e.printStackTrace(); } }}5.保证运行前先开启hbase,然后右键yin.java——>run as application.即可成功运行。
终端下查看hbase可以看到
运行hbase的代码实例参考:
http://www.aboutyun.com/thread-7149-1-1.html(增删改查)
http://www.tuicool.com/articles/amEFVz(mapreduce)