标签：10 String Hadoop2.10 Zookeeper3.4 tableName System param println out
在此之前要配置好三节点的hadoop集群,zookeeper集群,并启动它们,然后再配置好HBase环境
本文只是HBase2.3.5API操作作相应说明,如果前面环境还没有配置好,可以翻看我之前的博客,欢迎留言交流
节点hadoop01
节点hadoop02
节点hadoop03
1 maven依赖
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-server</artifactId>
<version>2.3.5</version>
</dependency>
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-client</artifactId>
<version>2.3.5</version>
</dependency>
<dependency>
<groupId>jdk.tools</groupId>
<artifactId>jdk.tools</artifactId>
<version>1.8</version>
<scope>system</scope>
<systemPath>C:/Program Files/Java/jdk1.8.0_261/lib/tools.jar</systemPath>
</dependency>
2 API操作
package com.hbase;
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 org.stringtemplate.v4.ST;
import scala.util.control.Exception;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
public class ConfigulationHBase {
private static Configuration configuration;
private static Connection connection;
private static Admin admin;
static {
configuration = HBaseConfiguration.create();
configuration.set("hbase.zookeeper.quorum", "192.168.161.141");
configuration.set("hbase.zookeeper.property.clientPort", "2181");
try {
connection = ConnectionFactory.createConnection(configuration);
admin = connection.getAdmin();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 判斷表是否存在
* <br>存在則返回true
* @param tableName
* @return
* @throws IOException
*/
public static boolean isTableExist(String tableName) throws IOException {
boolean b = admin.tableExists(TableName.valueOf(tableName));
return b;
}
/**
* 創建表
*
* 参数tableName为表的名称，字符串数组fields为存储记录各个域名称的数组。<br>
* 要求当HBase已经存在名为tableName的表时，先删除原有的表，然后再<br>
* 创建新的表 field：列族<br>
* @param tableName 表名
* @param fields 列族名
* @throws IOException
*/
public static void createTable(String tableName,String[] fields) throws IOException {
if(isTableExist(tableName)){
System.out.println(tableName + " table is alreadly exist...");
admin.disableTable(TableName.valueOf(tableName));
admin.deleteTable(TableName.valueOf(tableName));
System.out.println(tableName + " table is deleted...");
}
HTableDescriptor hTableDescriptor = new HTableDescriptor(TableName.valueOf(tableName));
for(String str:fields){
HColumnDescriptor hColumnDescriptor = new HColumnDescriptor(str);
hTableDescriptor.addFamily(hColumnDescriptor);
}
admin.createTable(hTableDescriptor);
System.out.println(tableName + " table is created!");
admin.close();
}
/**
* 添加数据
*
* 向表tableName,行键rowKey和fields字段指定的单元格中添加对应的值values<br>
* 例如:表名:student,行键:1001,添加的字段:info:name,添加的值:Janna<br>
* put 'student','1001','info:name','Janna'<br>
*
* @param tableName 表名
* @param rowKey 行键
* @param family 列族
* @param qualifier 列族值
* @param value 值
* @throws IOException
*/
public static void addRow(String tableName, String rowKey, String family, String qualifier, String value) throws IOException {
Table table = connection.getTable(TableName.valueOf(tableName));
byte[] rowKeyAsBytes = rowKey.getBytes();
Put put = new Put(rowKeyAsBytes);
put.addColumn(family.getBytes(), qualifier.getBytes(), value.getBytes());
table.put(put);
table.close();
admin.close();
}
/**
* 删除一行或者多行数据
* @param tableName
* @param rows
* @throws IOException
*/
public static void deleteMultiRow(String tableName, String... rows) throws IOException {
Table table = connection.getTable(TableName.valueOf(tableName));
List<Delete> deleteList = new ArrayList<Delete>();
for (int i = 0; i < rows.length; i++) {
Delete delete = new Delete(rows[i].getBytes());
deleteList.add(delete);
}
table.delete(deleteList);
table.close();
admin.close();
}
/**
*
* 查询某tableName所有的数据
* @param tableName 表名
* @throws IOException
*/
public static void getAllRows(String tableName) throws IOException {
Table table = connection.getTable(TableName.valueOf(tableName));
Scan scan = new Scan();
ResultScanner scanner = table.getScanner(scan);
for (Result result:scanner){
Cell[] cells = result.rawCells();
for (Cell cell:cells){
System.out.println("RowKey:" + Bytes.toString(CellUtil.cloneRow(cell)));
System.out.println("Famliy:" + Bytes.toString(CellUtil.cloneFamily(cell)));
System.out.println("qualifier:" + Bytes.toString(CellUtil.cloneQualifier(cell)));
System.out.println("value:" + Bytes.toString(CellUtil.cloneValue(cell)));
System.out.println("--------------------------------------");
}
System.out.println("=======================================");
}
table.close();
}
/**
* 查询tableName表的rowKey行键的数据
* get 'student','1001'
* @param tableName 表名
* @param rowKey 行键
*/
public static void getRow(String tableName, String rowKey) throws IOException {
Table table = connection.getTable(TableName.valueOf(tableName));
Get get = new Get(rowKey.getBytes());
Result result = table.get(get);
for (Cell cell:result.rawCells()){
System.out.println("RowKey:" + Bytes.toString(CellUtil.cloneRow(cell)));
System.out.println("Famliy:" + Bytes.toString(CellUtil.cloneFamily(cell)));
System.out.println("qualifier:" + Bytes.toString(CellUtil.cloneQualifier(cell)));
System.out.println("value:" + Bytes.toString(CellUtil.cloneValue(cell)));
System.out.println("--------------------------------------");
}
}
/**
* 获取某表某行键某列族的值
*
* @param tableName 表名
* @param rowKey 行键
* @param famliy 列族
* @param qualifier 列族值
* @throws IOException
*/
public static void getRowQualifier(String tableName, String rowKey, String famliy, String qualifier) throws IOException {
Table table = connection.getTable(TableName.valueOf(tableName));
Get get = new Get(rowKey.getBytes());
get.addColumn(famliy.getBytes(), qualifier.getBytes());
Result result = table.get(get);
for (Cell cell:result.rawCells()){
System.out.println("RowKey:" + Bytes.toString(CellUtil.cloneRow(cell)));
System.out.println("Famliy:" + Bytes.toString(CellUtil.cloneFamily(cell)));
System.out.println("qualifier:" + Bytes.toString(CellUtil.cloneQualifier(cell)));
System.out.println("value:" + Bytes.toString(CellUtil.cloneValue(cell)));
System.out.println("timestamp:" + cell.getTimestamp());
System.out.println("--------------------------------------");
}
}
/**
* main 程序入口
* @param args
* @throws IOException
*/
public static void main(String[] args) throws IOException {
// 創建表
// String[] fileds = {"base_info","other_info"};
// createTable("football", fileds);
// 添加数据
// addRow("football", "11002", "base_info", "name", "lin");
// addRow("football", "11002", "base_info", "sex", "female");
// addRow("football", "11003", "base_info", "sex", "male");
// 删除数据
// deleteMultiRow("football", new String[]{"11002"});
// 得到所有的数据
// getAllRows("student");
// 查询某表某行键数据
// getRow("student","1001");
// 查询某表某行键某列族数据
getRowQualifier("student", "1001", "info", "name");
}
}
3 部分结果截图
仅供参考，有错误还请指出！
有什么想法，评论区留言，互相指教指教。
标签：10,String,Hadoop2.10,Zookeeper3.4,tableName,System,param,println,out 来源： https://www.cnblogs.com/linzm14/p/15008497.html
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