java操作HBase

创建一个学生信息表，用来存储学生的姓名（姓名作为行键，且假设姓名不会重复）以及考试成绩，其中考试成绩（score）是一个列族，存储了各个科目的考试成绩。然后向student中添加数据

1、HBase依赖

<dependency>
	<groupId>org.apache.hbase</groupId>
	<artifactId>hbase-server</artifactId>
	<version>2.2.0</version>
</dependency>
<dependency>
	<groupId>org.apache.hbase</groupId>
	<artifactId>hbase-client</artifactId>
	<version>2.2.0</version>
</dependency>

2、HBase数据源

package com.example.demo.config;
 
import com.example.demo.service.ICodeService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.ApplicationArguments;
import org.springframework.boot.ApplicationRunner;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
 
import java.util.HashMap;
import java.util.List;
import java.util.Map;
 
@Component
@Order(1) 
public class NmsHBaseSource implements ApplicationRunner {
 
	// 管理HBase的配置信息
    public static Configuration conf;
	// 管理HBase的连接
    public static Connection conn;
	// 管理HBase数据库的连接
    public static Admin admin;
 
    @Override
    public void run(ApplicationArguments args) throws Exception {
		conf = HBaseConfiguration.create();
        System.setProperty("HADOOP_USER_NAME", "hadoop");
        conf.set("HADOOP_USER_NAME", "hadoop");
        conf.set("hbase.root.dir", "hdfs://master:9000/hbase");
        conf.set("hbase.zookeeper.quorum", "master");//配置Zookeeper的ip地址
        conf.set("hbase.zookeeper.property.clientPort", "2181");//配置zookeeper的端口

        conn = ConnectionFactory.createConnection(conf);
        admin = conn.getAdmin();
    }
	
	 /**
     * 关闭所有连接
     *
     * @throws IOException 可能出现的异常
     */
    public static void close() throws IOException {
        if (admin != null)
            admin.close();
        if (conn != null)
            conn.close();
    }
	
	/**
     * 创建表
     * @param myTableName 表名
     * @param colFamily 列族名的数组
     * @throws IOException 可能出现的异常
     */
    public static void createTable(String myTableName, String[] colFamily) throws IOException {
        TableName tableName = TableName.valueOf(myTableName);
        if (admin.tableExists(tableName)) {
            logger.info(myTableName + "表已经存在");
        } else {
            //HTableDescriptor hTableDescriptor = new HTableDescriptor(tableName);
            //for (String str : colFamily) {
               // HColumnDescriptor hColumnDescriptor = new HColumnDescriptor(str);
               // hTableDescriptor.addFamily(hColumnDescriptor);
            //}
            //admin.createTable(hTableDescriptor);

            TableDescriptorBuilder tableDescriptor = TableDescriptorBuilder.newBuilder(tableName);    
            for (String str : colFamily) {
	            ColumnFamilyDescriptor columnFamily = ColumnFamilyDescriptorBuilder.newBuilder(Bytes.toBytes(str)).build();// 构建列族对象                 
	            tableDescriptor.setColumnFamily(columnFamily); // 设置列族
            }
            admin.createTable(tableDescriptor.build()); // 创建表

            
        }
    }
	
	 /**
     * 添加数据
     * @param tableName 表名
     * @param rowkey 行键
     * @param colFamily 列族
     * @param col 列
     * @param value 值
     * @throws IOException 可能出现的异常
     */
    public static void insertData(String tableName,String rowkey,String colFamily,String col,String value) throws IOException {
        Table table = conn.getTable(TableName.valueOf(tableName));
        Put put = new Put(rowkey.getBytes());
        put.addColumn(colFamily.getBytes(),col.getBytes(),value.getBytes());
        table.put(put);
        table.close();
    }
	
	/**
     * 根据行键删除数据
     * @param tableName 表名
     * @param rowkey 行键
     * @throws IOException 可能出现的异常
     */
    public static void deleteData(String tableName,String rowkey) throws IOException {
        Table table = conn.getTable(TableName.valueOf(tableName));
        Delete delete = new Delete(rowkey.getBytes());
        table.delete(delete);
        table.close();
    }

    /**
     * 获取数据
     * @param tableName 表名
     * @param rowkey 行键
     * @param colFamily 列族
     * @param col 列
     * @throws IOException 可能出现的异常
     */
    public static void getData(String tableName,String rowkey,String colFamily,Str