使用Java操作Hbase

目录

修改hosts文件

导入jar包

配置hbase信息，连接hbase数据库

创建表

删除表

获取namespace

获取tables

添加数据

查询表中的数据

查询表中所有数据

关闭流

修改hosts文件

位置：C:\Windows\System32\drivers\etc\hosts

win+R：ping一下IP地址和虚拟机名看一下能不能ping通 

导入jar包

创建maven项目，在pom.xml 里面添加jar包

    <dependency>
      <groupId>org.apache.hbase</groupId>
      <artifactId>hbase-client</artifactId>
      <version>2.3.5</version>
    </dependency>
    <dependency>
      <groupId>org.apache.hbase</groupId>
      <artifactId>hbase-server</artifactId>
      <version>2.3.5</version>
    </dependency>

配置hbase信息，连接hbase数据库

    //定义一个config，用于获取配置对象
    static Configuration config = null;
    //获取连接
    private Connection conn = null;
    Admin admin = null;

    public void init() throws IOException {
        //配置hbase信息，连接hbase数据库
        config = HBaseConfiguration.create();
        config.set(HConstants.HBASE_DIR, "hdfs://192.168.152.192:9000/hbase");
        config.set(HConstants.ZOOKEEPER_QUORUM, "192.168.152.192");
        config.set(HConstants.CLIENT_PORT_STR, "2181");
        //hbase连接工厂
        conn = ConnectionFactory.createConnection(config);
        //拿到admin
        admin = conn.getAdmin();
    }

创建命名空间

    public void createNameSpace() {
        NamespaceDescriptor test = NamespaceDescriptor.create("test").build();

        try {
            //执行创建对象
            admin.createNamespace(test);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

创建表

    public void createTable() throws IOException {
        //创建表的描述类
        TableName tableName = TableName.valueOf("test:student");
        //获取表格描述器
        HTableDescriptor desc = new HTableDescriptor(tableName);

        //创建列族的描述类，添加列族
        HColumnDescriptor family1 = new HColumnDescriptor("info1");
        HColumnDescriptor family2 = new HColumnDescriptor("info2");
        desc.addFamily(family1);
        desc.addFamily(family2);

        admin.createTable(desc);
    }

删除表

    public void deleteTable() throws IOException { 
        //禁用
        admin.disableTable(TableName.valueOf("test:student"));
        //删除
        admin.deleteTable(TableName.valueOf("test:student"));
}

获取namespace

    public void getAllNamespace() throws IOException {
        String[] namespaces = admin.listNamespaces();
         String s = Arrays.toString(namespaces);
         System.out.println(s);
    }

获取tables

    public void getAllNamespace() throws IOException {
        List<TableDescriptor> tableDescriptors =
 admin.listTableDescriptorsByNamespace("test".getBytes());
        System.out.println(tableDescriptors);
    }

添加数据

 public void insertData() throws IOException {
        //获取表的信息
        Table table = conn.getTable(TableName.valueOf("test:student"));
        //设置行键
        Put put = new Put(Bytes.toBytes("student1"));
        //设置列的标识以及列值
        put.addColumn("info1".getBytes(), "name".getBytes(), "zs".getBytes());
        put.addColumn("info2".getBytes(), "school".getBytes(), "xwxx".getBytes());
        //执行添加
        table.put(put);

        //使用集合添加数据
        Put put2 = new Put(Bytes.toBytes("student2"));
        put2.addColumn("info1".getBytes(), "name".getBytes(), "zss".getBytes());
        put2.addColumn("info2".getBytes(), "school".getBytes(), "xwxx".getBytes());
        Put put3 = new Put(Bytes.toBytes("student3"));
        put3.addColumn("info1".getBytes(), "name".getBytes(), "zsr".getBytes());
        put3.addColumn("info2".getBytes(), "school".getBytes(), "xwxx".getBytes());
        List<Put> list = new ArrayList<>();
        list.add(put2);
        list.add(put3);
        table.put(list);
    }

查询表中的数据

public void queryData() throws IOException {
        Table table = conn.getTable(TableName.valueOf("test:student"));
        Get get = new Get(Bytes.toBytes("student1"));
        Result result = table.get(get);
        byte[] value = result.getValue(Bytes.toBytes("info1"), Bytes.toBytes("name"));
        System.out.println("姓名:" + Bytes.toString(value));
        value = result.getValue(Bytes.toBytes("info2"), Bytes.toBytes("school"));
        System.out.println("学校:" + Bytes.toString(value));

    }

查询表中所有数据

关闭流

    public void close() throws IOException {
        if (admin != null) {
            admin.close();
        }
        if (conn != null) {
            conn.close();
        }
    }