使用Java操作HBase（增，删，改，查操作）

在这里我用的是idea操作的一、配置1.首先确保HBase集群已经开启[root@hadoop ~]# jps2761 HQuorumPeer2137 ResourceManager7114 Jps2858 HMaster1691 NameNode1789 DataNode2237 NodeManager2943 HRegionServer1983 SecondaryNameNode上面所有节点都

lambda-小张

7287人浏览 · 2022-04-19 20:10:58

lambda-小张 · 2022-04-19 20:10:58 发布

3、创建maven项目，在pom.xml文件中添加如下依赖项

4.配置log4j.properties文件

在这里我用的是idea操作的

一、配置

1.首先确保HBase集群已经开启

[root@hadoop ~]# jps
2761 HQuorumPeer
2137 ResourceManager
7114 Jps
2858 HMaster
1691 NameNode
1789 DataNode
2237 NodeManager
2943 HRegionServer
1983 SecondaryNameNode

上面所有节点都有

2.配置hosts文件

在你所在电脑配置你的hadoop集群信息，所以需要找到并修改hosts文件：

hosts的目录：C:\Windows\System32\drivers\etc

在这里我的伪分布式下的，修改hosts文件时需要打开所有权限，才能保存

使用记事本打开，修改后并保存

在文档最后一行加上IP空格主机名

任务管理器中输入ping 主机名

C:\Users\>ping hadoop
192.168.171.151 的 Ping 统计信息:
    数据包: 已发送 = 4，已接收 = 4，丢失 = 0 (0% 丢失)，
往返行程的估计时间(以毫秒为单位):
    最短 = 0ms，最长 = 1ms，平均 = 0ms

3、创建`maven`项目，在`pom.xml`文件中添加如下依赖项

<?xml version="1.0" encoding="UTF-8"?>
<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.lenovo</groupId>
    <artifactId>0406</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
<!-- 从这里导入就可以了 -->
    <dependencies>
<dependency>  
     <groupId>jdk.tools</groupId>   
     <artifactId>jdk.tools</artifactId>  
     <version>1.8</version>  
     <scope>system</scope>  
     <systemPath>C:/Program Files/Java/jdk1.8.0_91/lib/tools.jar</systemPath>  
 </dependency> 
  <!-- HBase -->
  
   <dependency>
     <groupId>org.apache.hadoop</groupId>
     <artifactId>hadoop-common</artifactId>
     <version>2.7.3</version>
 </dependency>
  
 <dependency>  
     <groupId>org.apache.hbase</groupId>
     <artifactId>hbase-it</artifactId>
     <version>1.3.1</version>
     <type>pom</type>
 </dependency>
    </dependencies>
<!-- 这里结束 -->
</project>

4.配置log4j.properties文件

将log4j.properties文件拷贝到src/main/resources目录下,这样方便我们看到执行过程

log4j.properties文件路径在hadoop安装包里面：hadoop-2.7.3\etc\hadoop\log4j.properties

二、连接增删改查

1.连接测试类

import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.ConnectionFactory;
import org.junit.Test;

import java.io.IOException;

    /**
     * @Date 2022.04.20
     * @AUthor lambda-小张
     * @Description 测试连接
     *单元测试
 */
public class Demo {
    @Test
    public void test(){
        //获取配置对象
        Configuration con = new Configuration();
        con.set("hbase.zookeeper.quorum","IP地址");
        //获取连接
        try {
            Connection conn = ConnectionFactory.createConnection(con);
            System.out.println(conn);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

运行结果

2.创建表

/**
     * @Date 2022.04.20
     * @AUthor lambda-小张
     * @Description 创建表
     * Demo类名
     * demo表名
     */
public static void main(String[] args) {
    new Demo().createTable("demo","userinfo");
    }
public void createTable(String tableName, String familyName) {
        //获取配置对象
        Configuration con = new Configuration();
        con.set("hbase.zookeeper.quorum", "ip地址");
        //获取连接
        Connection conn = null;
        Admin admin = null;
        try {
            conn = ConnectionFactory.createConnection(con);
            //拿到admin
            admin = conn.getAdmin();
            //获取表格描述器
            HTableDescriptor hTableDescriptor = new HTableDescriptor(TableName.valueOf(tableName));
            //添加列簇
            hTableDescriptor.addFamily(new HColumnDescriptor(familyName));
            //执行创建操作
            admin.createTable(hTableDescriptor);
            //关流

            System.out.println("创建成功");
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                admin.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                conn.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }

运行结果：

HBase中的结果：

hbase(main):001:0> list
TABLE                                                                                                                                                          
demo                                                                                                                                                                  
1 row(s) in 0.3300 seconds
=> ["demo"]

3.添加数据

  /**
     * @Date 2022.04.20
     * @AUthor lambda-小张
     * @Description 添加数据
     * Demo类名
     * demo表名
     */
public static void main(String[] args) {
        boolean result = new Demo().addOneData("demo", "张三", "753159");//1001的数据
//        boolean result = new Demo().addOneData("demo", "lisi", "752159");//1002的数据
//        boolean result = new Demo().addOneData("demo", "王五", "762159");//1003的数据
        System.out.println(result);
    }
public boolean addOneData(String tableName,String userName,String passWord){
        //获取配置对象
        Configuration con = new Configuration();
        con.set("hbase.zookeeper.quorum","IP地址");
        Connection conn = null;
        Table table = null;
        //获取连接
        try {
            conn = ConnectionFactory.createConnection(con);
            //获取表的信息
            table = conn.getTable(TableName.valueOf(tableName));
            //设置行键
            Put put = new Put("1001".getBytes());
            //设置列的标识 以及列值
            put.addColumn("userinfo".getBytes(),"username".getBytes(),userName.getBytes());
            put.addColumn("userinfo".getBytes(),"password".getBytes(),passWord.getBytes());
            //执行添加
            table.put(put);
            //关流
            table.close();
            conn.close();

        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                table.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                conn.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return true;
    }

运行结果：

HBase中的结果：

hbase(main):003:0> scan 'demo'
ROW                                 COLUMN+CELL                                                                                          
 1001                               column=userinfo:name, timestamp=1650476863233, value=\xE5\xBC\xA0\xE4\xB8\x89                        
 1001                               column=userinfo:password, timestamp=1650476863233, value=753159                                      
1 row(s) in 0.0230 seconds

4.查询指定行键数据

  /**
     * @Date 2022.04.21
     * @AUthor lambda-小张
     * @Description 查询行键数据
     * demo表名
     * 单元测试
     */
@Test
    //获取全部的数据
    public void getAllData2(){
        //获取配置对象
        Configuration con= new Configuration();
        con.set("hbase.zookeeper.quorum","ip地址");
        Connection conn = null;
        Table user = null;
        try {
            //获取连接
            conn = ConnectionFactory.createConnection(con);
            user = conn.getTable(TableName.valueOf("demo"));
            //创建get
            Get get = new Get("1001".getBytes());
            //获取所有列
            Result result = user.get(get);
            Cell[] cells = result.rawCells();
            for (Cell cell : cells) {
                //获取行键
                byte[] rowKey = result.getRow();
                String s = new String(rowKey);
                //获取列名
                byte[] qualifier = cell.getQualifier();
                String columnName = new String(qualifier);
                //获取值
                byte[] value = cell.getValue();
                String value2 = new String(value);
                System.out.println("行键:"+s+"列名:"+columnName+"值:"+value2);
            }



        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                user.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                conn.close();
            } catch (IOException e) {
                e.printStackTrace();
            }

        }
    }

运行结果：

HBase中的结果：

hbase(main):007:0> get 'demo','1001'
COLUMN                              CELL                                                                                                 
 userinfo:name                      timestamp=1650477242603, value=\xE7\x8E\x8B\xE4\xBA\x94                                              
 userinfo:password                  timestamp=1650477242603, value=762159                                                                
1 row(s) in 0.0780 seconds

5.查询指定行键范围

 /**
     * @Date 2022.04.21
     * @AUthor lambda-小张
     * @Description 查询指定行键范围
     * demo表名
     * 单元测试
     */
@Test
    public void sacnAllData() {
        Configuration con = new Configuration();
        con.set("hbase.zookeeper.quorum", "IP地址");
        //获取连接
        Connection conn = null;
        Table user = null;
        try {
            conn = ConnectionFactory.createConnection(con);
            user = conn.getTable(TableName.valueOf("demo"));
            Scan scan = new Scan();
            scan.setStartRow("1001".getBytes());
            scan.setStopRow("1004".getBytes());//小一位
            ResultScanner scanner = user.getScanner(scan);
            for (Result result : scanner) {
                List<Cell> cells = result.listCells();
                for (Cell cell : cells) {
                    byte[] rowKey = result.getRow();
                    String s = new String(rowKey);
                    byte[] qualifier = cell.getQualifier();
                    String columnName = new String(qualifier);
                    byte[] value = cell.getValue();
                    String value2 = new String(value);
                    System.out.println("行键:" + s + "列名:" + columnName + "值:" + value2);
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                user.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                conn.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

运行结果：

HBase中的结果：

hbase(main):008:0> scan 'demo'
ROW                                 COLUMN+CELL                                                                                          
 1001                               column=userinfo:name, timestamp=1650477242603, value=\xE7\x8E\x8B\xE4\xBA\x94                        
 1001                               column=userinfo:password, timestamp=1650477242603, value=762159                                      
 1002                               column=userinfo:name, timestamp=1650477294338, value=lisi                                            
 1002                               column=userinfo:password, timestamp=1650477294338, value=752159                                      
 1003                               column=userinfo:name, timestamp=1650477429031, value=\xE5\xBC\xA0\xE4\xB8\x89                        
 1003                               column=userinfo:password, timestamp=1650477429031, value=753159                                      
3 row(s) in 0.0280 seconds

6.查询表的行数

/**
     * @Date 2022.04.21
     * @AUthor lambda-小张
     * @Description 查询表的行数
     * demo表名
     * 单元测试
     */
@Test
    public void countRows(){
        Configuration con = new Configuration();
        con.set("hbase.zookeeper.quorum", "IP地址");
        //获取连接
        Connection conn = null;
        Table student = null;
        try {
            conn = ConnectionFactory.createConnection(con);
            student = conn.getTable(TableName.valueOf("demo"));
            Scan scan = new Scan();
            ResultScanner scanner = student.getScanner(scan);
            int num = 0;
            for(Result result = scanner.next();result!=null;result=scanner.next()) {
                num++;
            }
            System.out.println("行数："+num);

        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                student.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                conn.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }


    }

运行结果：

HBase中的结果：

hbase(main):009:0> count 'demo'
3 row(s) in 0.0280 seconds

=> 3

7.查询表中数据

/**
     * @Date 2022.04.21
     * @AUthor lambda-小张
     * @Description 查询全表数据
     * demo表名
     * 单元测试
     */
 @Test
     public void getAllUser(){
         //获取连接
         Configuration con = new Configuration();
         con.set("hbase.zookeeper.quorum", "192.168.17.151");
         //获取连接
         Connection conn = null;
         //获取表
         Table user = null;
         ResultScanner scanner = null;
         try {
             conn = ConnectionFactory.createConnection(con);
             user = conn.getTable(TableName.valueOf("demo"));
             //创建scan对象
             Scan scan = new Scan();
             //进行查询
             scanner = user.getScanner(scan);
             //循环
             for (Result result : scanner) {
                 for (Cell cell : result.rawCells()) {
                     byte[] row = cell.getRow();
                     System.out.print(new String(row));
                     byte[] qualifier = cell.getQualifier();
                     System.out.print(new String(qualifier));
                     byte[] value = cell.getValue();
                     System.out.println(new String(value));
                 }

             }

         } catch (IOException e) {
             e.printStackTrace();
         }finally {
             scanner.close();
             try {
                 user.close();
             } catch (IOException e) {
                 e.printStackTrace();
             }
             try {
                 conn.close();
             } catch (IOException e) {
                 e.printStackTrace();
             }
         }

     }

运行结果：

HBase中的结果：

hbase(main):001:0> scan 'demo'
ROW                                 COLUMN+CELL                                                                                          
 1001                               column=userinfo:name, timestamp=1650516148931, value=\xE7\x8E\x8B\xE4\xBA\x94                        
 1001                               column=userinfo:password, timestamp=1650516148931, value=762159                                      
 1002                               column=userinfo:name, timestamp=1650516226590, value=lisi                                            
 1002                               column=userinfo:password, timestamp=1650516226590, value=752159                                      
 1003                               column=userinfo:name, timestamp=1650516246151, value=\xE7\x8E\x8B\xE4\xBA\x94                        
 1003                               column=userinfo:password, timestamp=1650516246151, value=762159                                      
3 row(s) in 0.5190 seconds

8.查询已存在表

/**
     * @Date 2022.04.21
     * @AUthor lambda-小张
     * @Description 查询已存在表
     * demo表名
     * 单元测试
     */
@Test
    public void listTables(){
        Configuration con = new Configuration();
        con.set("hbase.zookeeper.quorum", "ip地址");
        //获取连接
        Connection conn = null;
        Admin admin = null;
        try {
            conn = ConnectionFactory.createConnection(con);
            //拿到admin
            admin = conn.getAdmin();
            HTableDescriptor[] hTableDescriptors = admin.listTables();
            for (HTableDescriptor hTableDescriptor : hTableDescriptors) {
                System.out.println(hTableDescriptor.getNameAsString());
            }
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                admin.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                conn.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

运行结果：

HBase中的结果：

hbase(main):011:0> list
TABLE                                                                                                                                    
demo                                                                                                                                     
helloWorld                                                                                                                               
student                                                                                                                                  
user                                                                                                                                     
year                                                                                                                                     
5 row(s) in 0.0330 seconds

=> ["demo", "helloWorld", "student", "user", "year"]

9.删除指定行数据

/**
     * @Date 2022.04.21
     * @AUthor lambda-小张
     * @Description 删除指定行数据
     * demo表名
     * 单元测试
     */
@Test
    public void deleteDataData() {
        Configuration con = new Configuration();
        con.set("hbase.zookeeper.quorum", "ip地址");
        //获取连接
        Connection conn = null;
        Table helloWorld = null;

        try {
            conn = ConnectionFactory.createConnection(con);
            helloWorld = conn.getTable(TableName.valueOf("demo"));
            Delete delete = new Delete("1001".getBytes());
            helloWorld.delete(delete);
            System.out.println("删除成功");
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                helloWorld.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                conn.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

运行结果：

HBase中的结果：

hbase(main):012:0> scan 'demo'
ROW                                 COLUMN+CELL                                                                                          
 1002                               column=userinfo:name, timestamp=1650477294338, value=lisi                                            
 1002                               column=userinfo:password, timestamp=1650477294338, value=752159                                      
 1003                               column=userinfo:name, timestamp=1650477429031, value=\xE5\xBC\xA0\xE4\xB8\x89                        
 1003                               column=userinfo:password, timestamp=1650477429031, value=753159                                      
2 row(s) in 0.0230 seconds

10.删除表

/**
     * @Date 2022.04.21
     * @AUthor lambda-小张
     * @Description 删除表数据
     * demo表名
     * 单元测试
     */
@Test
    public void deleteTable(){
        Configuration con = new Configuration();
        con.set("hbase.zookeeper.quorum", "IP地址");
        //获取连接
        Connection conn = null;
        Admin admin = null;
        Table student = null;

        try {
            conn = ConnectionFactory.createConnection(con);
            //拿到admin
            admin = conn.getAdmin();
            student = conn.getTable(TableName.valueOf("demo"));
            admin.disableTable(TableName.valueOf("demo"));
            admin.deleteTable(TableName.valueOf("demo"));
            System.out.println("删除表成功");
        } catch (IOException e) {
            e.printStackTrace();
        }finally {
            try {
                student.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                admin.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
            try {
                conn.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

    }

运行结果：

HBase中的结果：

hbase(main):013:0> list
TABLE                                                                                                                                    
helloWorld                                                                                                                               
student                                                                                                                                  
user                                                                                                                                     
year                                                                                                                                     
4 row(s) in 0.0480 seconds

=> ["helloWorld", "student", "user", "year"]