HBase的Java API基本操作,测试(完全分布式)
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内容图文
HBase搭建完成后,可以进行基本的API操作,对HBase进行测试.
导入依赖:
<dependencies>
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-client</artifactId>
<version>1.2.1</version>
</dependency>
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-server</artifactId>
<version>1.2.1</version>
</dependency>
</dependencies>
代码:
/**
* Copyright (C), 2015-2019, XXX有限公司
* FileName: HBaseTest
* Author: Administrator
* Date: 2019/5/1 14:17
* Description:
* History:
* <author> <time> <version> <desc>
* 作者姓名 修改时间 版本号 描述
*/
package com.test;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.*;
import org.apache.hadoop.hbase.client.*;
import org.apache.hadoop.hbase.util.Bytes;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/**
* 〈一句话功能简述〉<br>
* 〈〉
* =====================
* @author Administrator
* @create 2019/5/1
* @since 1.0.0
*/
public class HBaseTest {
public static Configuration conf;
static{
//使用HBaseConfiguration的单例方法实例化
conf = HBaseConfiguration.create();
conf.set("hbase.zookeeper.quorum", "192.168.0.47");
conf.set("hbase.zookeeper.property.clientPort", "2181");
}
public static void main(String[] args) throws IOException {
// System.out.println(isTableExist("test"));
// createTable("test2","col1","col2");
// dropTable("test2");
// addRowData("test2", "test1_test1", "col1", "name", "zhangsan");
// addRowData("test2", "test1_test2", "col1", "name", "zhangsan");
// addRowData("test2", "test1_test3", "col1", "name", "zhangsan");
// deleteMultiRow("test2", "test1_test1", "test1_test2", "test1_test3");
// getAllRows("test2");
// getRow("test2", "test1_test");
// getRowQualifier("test2", "test1_test", "col1", "name");
listTables();
}
/**
* 判断表是否存在
* @param tableName
* @return
* @throws IOException
*/
public static boolean isTableExist(String tableName) throws IOException {
//在HBase中管理、访问表需要先创建HBaseAdmin对象
Connection connection = ConnectionFactory.createConnection(conf);
HBaseAdmin admin = (HBaseAdmin) connection.getAdmin();
return admin.tableExists(tableName);
}
/**
* 创建表
* @param tableName
* @param columnFamily
* @throws IOException
*/
public static void createTable(String tableName, String... columnFamily) throws IOException{
Connection connection = ConnectionFactory.createConnection(conf);
HBaseAdmin admin = (HBaseAdmin) connection.getAdmin();
//判断表是否存在
if(isTableExist(tableName)){
System.out.println("表" + tableName + "已存在");
//System.exit(0);
}else{
//创建表属性对象,表名需要转字节
HTableDescriptor descriptor = new HTableDescriptor(TableName.valueOf(tableName));
//创建多个列族
for(String cf : columnFamily){
descriptor.addFamily(new HColumnDescriptor(cf));
}
//根据对表的配置，创建表
admin.createTable(descriptor);
System.out.println("表" + tableName + "创建成功！");
}
}
/**
* 删除表
* @param tableName
* @throws IOException
*/
public static void dropTable(String tableName) throws IOException{
Connection connection = ConnectionFactory.createConnection(conf);
HBaseAdmin admin = (HBaseAdmin) connection.getAdmin();
if(isTableExist(tableName)){
admin.disableTable(tableName);
admin.deleteTable(tableName);
System.out.println("表" + tableName + "删除成功！");
}else{
System.out.println("表" + tableName + "不存在！");
}
}
/**
* 插入数据
* @param tableName 表名
* @param rowKey rowkey
* @param columnFamily 列族
* @param column 列名
* @param value 值
* @throws IOException
*/
public static void addRowData(String tableName, String rowKey, String columnFamily, String column, String value) throws IOException{
//创建HTable对象
Connection connection = ConnectionFactory.createConnection(conf);
Table table = connection.getTable(TableName.valueOf(tableName));
// HTable hTable = new HTable(conf, tableName);
//向表中插入数据
Put put = new Put(Bytes.toBytes(rowKey));
//向Put对象中组装数据
put.addColumn(Bytes.toBytes(columnFamily), Bytes.toBytes(column), Bytes.toBytes(value));
// put.add(Bytes.toBytes(columnFamily), Bytes.toBytes(column), Bytes.toBytes(value));
table.put(put);
table.close();
System.out.println("插入数据成功");
}
/**
* 删除多行数据
* @param tableName
* @param rows
* @throws IOException
*/
public static void deleteMultiRow(String tableName, String... rows) throws IOException{
Connection connection = ConnectionFactory.createConnection(conf);
Table table = connection.getTable(TableName.valueOf(tableName));
// HTable hTable = new HTable(conf, tableName);
List<Delete> deleteList = new ArrayList<Delete>();
for(String row : rows){
Delete delete = new Delete(Bytes.toBytes(row));
deleteList.add(delete);
}
table.delete(deleteList);
table.close();
System.out.println("删除数据成功");
}
/**
* 获取所有数据
* @param tableName
* @throws IOException
*/
public static void getAllRows(String tableName) throws IOException{
// HTable hTable = new HTable(conf, tableName);
Connection connection = ConnectionFactory.createConnection(conf);
Table table = connection.getTable(TableName.valueOf(tableName));
//得到用于扫描region的对象
Scan scan = new Scan();
//使用HTable得到resultcanner实现类的对象
ResultScanner resultScanner = table.getScanner(scan);
for(Result result : resultScanner){
Cell[] cells = result.rawCells();
for(Cell cell : cells){
//得到rowkey
System.out.println("行键:" + Bytes.toString(CellUtil.cloneRow(cell)));
//得到列族
System.out.println("列族" + Bytes.toString(CellUtil.cloneFamily(cell)));
System.out.println("列:" + Bytes.toString(CellUtil.cloneQualifier(cell)));
System.out.println("值:" + Bytes.toString(CellUtil.cloneValue(cell)));
}
}
}
/**
* 获取某一行数据
* @param tableName
* @param rowKey
* @throws IOException
*/
public static void getRow(String tableName, String rowKey) throws IOException{
Connection connection = ConnectionFactory.createConnection(conf);
Table table = connection.getTable(TableName.valueOf(tableName));
Get get = new Get(Bytes.toBytes(rowKey));
//get.setMaxVersions();显示所有版本
//get.setTimeStamp();显示指定时间戳的版本
Result result = table.get(get);
for(Cell cell : result.rawCells()){
System.out.println("行键:" + Bytes.toString(result.getRow()));
System.out.println("列族" + Bytes.toString(CellUtil.cloneFamily(cell)));
System.out.println("列:" + Bytes.toString(CellUtil.cloneQualifier(cell)));
System.out.println("值:" + Bytes.toString(CellUtil.cloneValue(cell)));
System.out.println("时间戳:" + cell.getTimestamp());
}
}
/**
* 获取某一行指定“列族:列”的数据
* @param tableName 表名
* @param rowKey rowkey
* @param family 列族
* @param qualifier 列名
* @throws IOException
*/
public static void getRowQualifier(String tableName, String rowKey, String family, String qualifier) throws IOException{
Connection connection = ConnectionFactory.createConnection(conf);
Table table = connection.getTable(TableName.valueOf(tableName));
Get get = new Get(Bytes.toBytes(rowKey));
get.addColumn(Bytes.toBytes(family), Bytes.toBytes(qualifier));
Result result = table.get(get);
for(Cell cell : result.rawCells()){
System.out.println("行键:" + Bytes.toString(result.getRow()));
System.out.println("列族" + Bytes.toString(CellUtil.cloneFamily(cell)));
System.out.println("列:" + Bytes.toString(CellUtil.cloneQualifier(cell)));
System.out.println("值:" + Bytes.toString(CellUtil.cloneValue(cell)));
}
}
/**
* 查看已有表
* @throws IOException
*/
public static void listTables() throws IOException {
Connection connection = ConnectionFactory.createConnection(conf);
HBaseAdmin admin = (HBaseAdmin) connection.getAdmin();
HTableDescriptor hTableDescriptors[] = admin.listTables();
for (HTableDescriptor hTableDescriptor : hTableDescriptors) {
System.out.println(hTableDescriptor.getNameAsString());
}
}
}
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