Java操作Hbase

1、创建maven项目，在pom.xml文件中添加如下依赖项

    <dependency>
      <groupId>org.apache.hbase</groupId>
      <artifactId>hbase-client</artifactId>
      <version>1.2.0</version>
    </dependency>

2、编写java 连接Hbase类：HBaseConfs.java

public class HBaseConfs {
    private HBaseConfs(){}
    private static Configuration getConf(){
        Configuration conf=new Configuration();
        conf.addResource(new Path("/opt/hbase/conf/hbase-site.xml"));
        conf.addResource(new Path("/opt/hadoop/etc/hadoop/core-site.xml"));
        return conf;
    }
    public static Connection getConn(){
        Connection conn=null;
        try {
            conn= ConnectionFactory.createConnection(getConf());
        } catch (IOException e) {
            e.printStackTrace();
        }
        return conn;
    }
    public static Admin getAdmin(){
        Admin admin=null;
        try {
            admin=getConn().getAdmin();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return admin;
    }
}

3、编写建表实现类：CreateTable.java

public class CreateTable {
    public static void main(String[] args){
        Admin admin= HBaseConfs.getAdmin();
        HTableDescriptor htd=new HTableDescriptor(TableName.valueOf(args[0]));
        for (int i = 1; i < args.length; i++) {
            try {
                HColumnDescriptor family=new HColumnDescriptor(args[i]);
                htd.addFamily(family);
            } catch (Exception e) {
                e.printStackTrace();
            }finally {
                try {
                    admin.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}

4、打 jar 包，并上传到 Linux 虚拟机上执行

• path：jar在Linux上的路径
• cn.kgc：实现类所在的包名

hadoop jar /path/file.jar cn.kgc.CreateTable

5、实现插入方法类：InsertTable.java

执行第4步操作

public class InsertTable {
    public static void main(String[] args) throws Exception {
        Connection conn= HBaseConfs.getConn();
        Admin admin=HBaseConfs.getAdmin();
        TableName[] tableNames = admin.listTableNames();
        for (TableName tableName : tableNames) {
            System.out.println(tableName.getNameAsString());
        }
        Table table=conn.getTable(TableName.valueOf("customer"));
        String[][] values={
            {"1","A","a","1st White House","hhh"}
            ,{"2","B","b","10th aierlan","jjj"}
            ,{"3","C","c","111th dizhongha","kkk"}
            ,{"4","D","d","nowhere","LLL"}
        };
        for (int i = 0; i < values.length; i++) {
            Put put=new Put(values[i][0].getBytes());
            put.addColumn("name".getBytes(),"fname".getBytes(),values[i][1].getBytes());
            put.addColumn("name".getBytes(),"lname".getBytes(),values[i][2].getBytes());
            put.addColumn("addr".getBytes(),"address".getBytes(),values[i][3].getBytes());
            put.addColumn("addr".getBytes(),"city".getBytes(),values[i][4].getBytes());
            table.put(put);
        }
        admin.close();
        conn.close();
    }
}