hbase之java api实战一

相关接口文档:

https://hbase.apache.org/book.html#arch.overview

https://hbase.apache.org/apidocs/index.html

http://hbase.apache.org/2.1/apidocs/index.html   //我的2.1.8 ,重点参考这个

https://www.docs4dev.com/docs/zh/apache-hbase/2.1/reference   中文文档-用户手册

 

第1步:创建maven项目

创建项目hbase

pom.xml:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">

  <modelVersion>4.0.0</modelVersion>

 

  <groupId>com.scitc</groupId>

  <artifactId>hbase</artifactId>

  <version>0.0.1-SNAPSHOT</version>

  <packaging>jar</packaging>

 

  <name>hbase</name>

  <url>http://maven.apache.org</url>

 

  <properties>

    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

    <hbase.version>2.1.8</hbase.version>

  </properties>

 

  <dependencies>

 

      <dependency>

          <groupId>org.apache.hbase</groupId>

          <artifactId>hbase-server</artifactId>

          <version>${hbase.version}</version>

      </dependency>

 

      <dependency>

          <groupId>org.apache.hbase</groupId>

          <artifactId>hbase-client</artifactId>

          <version>${hbase.version}</version>

      </dependency>

 

<!-- 这个依赖没用上

  <dependency>

    <groupId>org.apache.hbase</groupId>

    <artifactId>hbase-common</artifactId>

    <version>${hbase.version}</version>

</dependency>  -->

 

      <dependency> 

      <groupId>jdk.tools</groupId> 

      <artifactId>jdk.tools</artifactId> 

      <version>1.8</version> 

      <scope>system</scope> 

      <systemPath>${JAVA_HOME}/lib/tools.jar</systemPath> 

   </dependency>

 

    <dependency>

      <groupId>junit</groupId>

      <artifactId>junit</artifactId>

      <version>3.8.1</version>

      <scope>test</scope>

    </dependency>

  </dependencies>

 

    <build>

    <plugins>

        <plugin>

         <groupId>org.apache.maven.plugins</groupId>

         <artifactId>maven-compiler-plugin</artifactId>

         <configuration>

         <source>1.8</source>

         <target>1.8</target>

         </configuration>

   </plugin>

  

   <plugin>

             <artifactId>maven-assembly-plugin</artifactId>

             <configuration>

                 <descriptorRefs>

                     <descriptorRef>jar-with-dependencies</descriptorRef>

                 </descriptorRefs>

                 <archive>

                     <manifest>

                         <mainClass></mainClass>

                     </manifest>

                 </archive>

             </configuration>

             <executions>

                 <execution>

                     <id>make-assembly</id>

                     <phase>package</phase>

                     <goals>

                         <goal>single</goal>

                     </goals>

                 </execution>

             </executions>

         </plugin>

  

    </plugins>

</build>

</project>

第2步:HbaseOperation

HbaseOperation.java代码如下:

package com.scitc.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 java.io.IOException;

import java.util.ArrayList;

import java.util.List;

 

/**

 * @author geiliHe

 * @date 2020-06-09

 */

public class HbaseOperation {

   public static Configuration configuration;

    public static Connection connection;

    public static Admin admin;

    public static TableDescriptor tableDescriptor;

    //建立连接

    public static void init(){

        configuration  = HBaseConfiguration.create();

        configuration.set("hbase.rootdir","hdfs://192.168.56.110:9000/hbase");

        configuration.set("hbase.zookeeper.quorum", "master,slave1,slave2");

        configuration.set("hbase.zookeeper.property.client", "2181");

        try{

            connection = ConnectionFactory.createConnection(configuration);

            admin = connection.getAdmin();

        }catch (IOException e){

            e.printStackTrace();

        }

    }

    //关闭连接

    public static void close(){

        try{

            if(admin != null){

                admin.close();

            }

            if(null != connection){

                connection.close();

            }

        }catch (IOException e){

            e.printStackTrace();

        }

    }

   

    /**1:创建表-pass

     * @param tableName   表名

     * @param colFamily   列族

     * @throws IOException

     */

   public static void createTable(String tableName,String[] colFamily) throws IOException {

       init();

        TableName mytable = TableName.valueOf(tableName);

        if(admin.tableExists(mytable)){

            System.out.println("talbe is exists!");

        }else {

          //表描述器构造器

            TableDescriptorBuilder tdb = TableDescriptorBuilder.newBuilder(mytable);

            //创建集合用于存放列描述对象

            List<ColumnFamilyDescriptor> families = new ArrayList<>();

            //将每个列族对应的ColumnFamilyDescriptor对象添加到集合中

            for(String cols:colFamily) {

               families.add(ColumnFamilyDescriptorBuilder.newBuilder(cols.getBytes()).build());

            }

            tableDescriptor = tdb.setColumnFamilies(families).build();

           //创建表

            admin.createTable(tableDescriptor);;

        }

        close();

    }

   /**

    * 2:实现单个数据插入-pass

    * 修改数和插入数据一样,不会覆盖原来版本,通过时间戳区别

    * @param tableName

    * @param rowKey

    * @param colFamily

    * @param col

    * @param val

    * @throws IOException

    */

    public static void insertRow(String tableName,String rowKey,String colFamily,String col,String val) throws IOException {

           init();

           Table table = connection.getTable(TableName.valueOf(tableName));

           Put put = new Put(rowKey.getBytes());

           put.addColumn(colFamily.getBytes(), col.getBytes(), val.getBytes());

           table.put(put);

           table.close();

           close();

       }

    /**

     * 3-1:通过行键-列族-列:获取单个数据-pass

     * @param tableName

     * @param rowKey

     * @param colFamily

     * @param col

     * @throws IOException

     */

    public static void getData(String tableName,String rowKey,String colFamily,String col)throws  IOException{

           init();

           Table table = connection.getTable(TableName.valueOf(tableName));

           Get get = new Get(rowKey.getBytes());

           get.addColumn(colFamily.getBytes(),col.getBytes());

           Result result = table.get(get);

           showCell(result);

           table.close();

           close();

       }

    /**

     * 3-2:通过行键获取值-pass

     * @param tableName

     * @param rowKey

     * @throws IOException

     */

    public static void getDataByRowkey(String tableName,String rowKey)throws  IOException{

           init();

           Table table = connection.getTable(TableName.valueOf(tableName));

           //获得一行

           Get get = new Get(Bytes.toBytes(rowKey));

           Result set = table.get(get);

           Cell[] cells = set.rawCells();

           System.out.print("查询结果");

           for (Cell cell: cells){

               System.out.println(Bytes.toString(cell.getQualifierArray(), cell.getQualifierOffset(), cell.getQualifierLength()) + "::" +

               Bytes.toString(cell.getValueArray(), cell.getValueOffset(), cell.getValueLength()));

             }

           table.close();

           close();

           }

    /**

     * 4:给制定表添加列族

     * @param tableName

     * @param familyName

     * @throws IOException

     */

    public static void addColumnFamily(String tableName, String familyName) throws IOException {

         init();

         TableName tn = TableName.valueOf(tableName);

  

         // 通过新增的familyName来构建ColumnFamilyDescriptor对象

         ColumnFamilyDescriptor columnFamily = ColumnFamilyDescriptorBuilder.newBuilder(familyName.getBytes()).build();

         admin.addColumnFamily(tn, columnFamily);

         close();

       }

    

    /**

     * 5:删除单个数据-pass

     * @param tableName

     * @param rowKey

     * @param colFamily

     * @param col

     * @throws IOException

     */

    public static void deleteRow(String tableName,String rowKey,String colFamily,String col) throws IOException {

           init();

           Table table = connection.getTable(TableName.valueOf(tableName));

           Delete delete = new Delete(rowKey.getBytes());

           //删除指定列族

           //delete.addFamily(Bytes.toBytes(colFamily));

           //删除指定列

           //delete.addColumn(Bytes.toBytes(colFamily),Bytes.toBytes(col));

           table.delete(delete);

           table.close();

           close();

       }

    

     /**

      * 格式化输出获取的数据

      * @param result

      */

    public static void showCell(Result result){

           Cell[] cells = result.rawCells();

           for(Cell cell:cells){

               System.out.println("RowName:"+new String(CellUtil.cloneRow(cell))+" ");

               System.out.println("Timetamp:"+cell.getTimestamp()+" ");

               System.out.println("column Family:"+new String(CellUtil.cloneFamily(cell))+" ");

               System.out.println("row Name:"+new String(CellUtil.cloneQualifier(cell))+" ");

               System.out.println("value:"+new String(CellUtil.cloneValue(cell))+" ");

           }

       }

    /**

     * 6:查看已有的表-pass

     * @throws IOException

     */

       public static void listTables() throws IOException {

           init();

           TableName[] tables = admin.listTableNames();

           for(TableName table:tables) {

             System.out.println("hbase数据库的表:"+table.toString());

           }

           close();

       }

       /**

        * 7:删除一张表

        * @param tableName

        * @throws IOException

        */

       public static void deleteTable(String tableName) throws IOException {

          init();

          TableName tn = TableName.valueOf(tableName);

          if (!admin.tableExists(tn)) {

             System.out.print("要删除的表不存在");

          }else {

                  admin.disableTable(tn);

                  admin.deleteTable(tn);

               }

           close();

       }

   public static void main(String[] args) throws IOException {

      //createTable("user",new String[]{"address","info"});

        //insertRow("user", "tom", "info", "age", "26");

        //insertRow("user", "tom", "info", "birthday", "1998-04-05");

        //getData("user", "tom", "info", "age");

      //deleteRow("user","tom","info","birthday"); 

      //listTables();

      getDataByRowkey("user","tom");

   }

}

 

参考文献:

1:https://www.cnblogs.com/swordfall/p/10301707.html

2:http://dblab.xmu.edu.cn/blog/1590-2/

3:https://blog.csdn.net/snihytn/article/details/105544169

posted @ 2020-06-09 17:36  geiliHe  阅读(914)  评论(0编辑  收藏  举报