本帖最后由 hyj 于 2014-3-17 14:57 编辑
Eclipse版本:Kepler Service Release 1
操作系统:Ubuntu13.04
Hadoop:2.2.0
HBase:0.96.0
编译可参考:
hbase与hadoop2.X在CentOS6.4下源码编译
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/app/hadoop/hbase096目录下)。
2:在eclipse里新建一个java项目HBase,然后选择项目属性,在Libraries->Add External JARs...,然后选择/app/hadoop/hbase096/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HBase下增加一个文件夹conf,将Hbase集群的配置文件hbase-site.xml复制到该目录,然后选择项目属性在Libraries->Add Class Folder,将刚刚增加的conf目录选上。
4:在HBase项目中增加一个chapter12的package,然后增加一个HBaseTestCase的class,然后将陆嘉恒老师的《Hadoop实战第2版》12章的代码复制进去,做适当的修改,代码如下:
- package chapter12;
-
- import java.io.IOException;
-
- 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 HBaseTestCase {
- //声明静态配置 HBaseConfiguration
- static Configuration cfg=HBaseConfiguration.create();
-
- //创建一张表,通过HBaseAdmin HTableDescriptor来创建
- public static void creat(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!");
- }
- }
-
- //添加一条数据,通过HTable Put为已经存在的表来添加数据
- 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+"'");
- }
-
- 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);
- }
- //显示所有数据,通过HTable Scan来获取已有表的信息
- 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 [] agrs) {
- String tablename="hbase_tb";
- String columnFamily="cf";
-
- try {
- HBaseTestCase.creat(tablename, columnFamily);
- HBaseTestCase.put(tablename, "row1", columnFamily, "cl1", "data");
- HBaseTestCase.get(tablename, "row1");
- HBaseTestCase.scan(tablename);
- /* if(true==HBaseTestCase.delete(tablename))
- System.out.println("Delete table:"+tablename+"success!");
- */
- }
- catch (Exception e) {
- e.printStackTrace();
- }
- }
- }
复制代码
5:设置运行配置,然后运行。运行前将Hbase集群先启动。
6:检验,使用hbase shell查看hbase,发现已经建立表hbase_tb。
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