Hbase关于Java常用API举例

worker321

　　1. HBase相关对Admin操作的的API封装在HBaseAdmin中，封装了HBase常用操作的API
　　使用方法：
　　pom.xml







  <!-- https://mvnrepository.com/artifact/org.apache.hbase/hbase-client -->
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-client</artifactId>
<version>0.98.5-hadoop2</version>
</dependency>







1 package com.qunar.demo.hbase;
2
3 import com.google.common.base.Preconditions;
4 import com.google.common.base.Strings;
5 import com.google.common.collect.Lists;
6 import org.apache.hadoop.conf.Configuration;
7 import org.apache.hadoop.hbase.HBaseConfiguration;
8 import org.apache.hadoop.hbase.HColumnDescriptor;
9 import org.apache.hadoop.hbase.HTableDescriptor;
10 import org.apache.hadoop.hbase.TableName;
11 import org.apache.hadoop.hbase.client.HBaseAdmin;
12 import org.junit.Test;
13 import org.slf4j.Logger;
14 import org.slf4j.LoggerFactory;
15
16 import java.io.IOException;
17 import java.util.Iterator;
18 import java.util.List;
19
20 /**
21  * author: 龚细军
22  * class-aim:
23  */
24 public class CreateHBaseTable {
25
26     private static Logger logger = LoggerFactory.getLogger(CreateHBaseTable.class);
27
28     /*创建表单*/
29     public void createTable(HBaseAdmin admin, String tableName,
30                             List<String> columnNames) throws IOException {
31
32
33         Preconditions.checkArgument(!Strings.isNullOrEmpty(tableName), "table name is not allowed null or empty !");
34         Preconditions.checkArgument((null != columnNames && columnNames.size() > 0), "colume is not allowed empty !");
35         if (null == admin) {
36             throw new IllegalStateException("admin is empty !");
37         }
38
39         HTableDescriptor hTableDescriptor = new HTableDescriptor(TableName.valueOf(tableName));
40         for (String colName : columnNames) {
41             hTableDescriptor.addFamily(new HColumnDescriptor(colName));
42         }
43         admin.createTable(hTableDescriptor);
44     }
45
46     @Test
47     public void _createMain() throws IOException {
48
49         Configuration conf = HBaseConfiguration.create();
50         HBaseAdmin admin = new HBaseAdmin(conf);
51         List list = Lists.newArrayList();
52         list.add("emp_col");
53         list.add("emp_col1");
54         list.add("emp_col2");
55         list.add("emp_col3");
56         this.createTable(admin, "emp", list);
57     }
58
59     /*查询所有表单*/
60     public List<String> scanTables(HBaseAdmin admin) {
61
62         HTableDescriptor[] hTableDescriptors = new HTableDescriptor[0];
63         if (null == admin) {
64             throw new IllegalStateException("admin is empty !");
65         }
66         try {
67             hTableDescriptors = admin.listTables();
68         } catch (IOException e) {
69             logger.error("获取表单异常", e);
70         }
71         List<String> tmpList = Lists.newArrayList();
72         for (HTableDescriptor hTableDescriptor : hTableDescriptors) {
73             tmpList.add(String.valueOf(hTableDescriptor.getNameAsString()));
74         }
75         return tmpList;
76     }
77
78     @Test
79     public void _scanTables() throws IOException {
80         Configuration conf = HBaseConfiguration.create();
81         HBaseAdmin admin = new HBaseAdmin(conf);
82         List<String> tableNames = this.scanTables(admin);
83         Iterator iterator = tableNames.iterator();
84         while (iterator.hasNext()) {
85             //日志被收集了,使用下面方式打出
86             //logger.info(String.valueOf(iterator.next()));
87             System.out.println(String.valueOf(iterator.next()));
88         }
89     }
90
91
92 }
　　HBase对于客户端封装在client调用：







  1 package com.qunar.demo.hbase;
  2
  3 import com.google.common.base.Strings;
  4 import org.apache.hadoop.conf.Configuration;
  5 import org.apache.hadoop.hbase.HBaseConfiguration;
  6 import org.apache.hadoop.hbase.client.Get;
  7 import org.apache.hadoop.hbase.client.HTable;
  8 import org.apache.hadoop.hbase.client.Put;
  9 import org.apache.hadoop.hbase.client.Result;
10 import org.apache.hadoop.hbase.util.Bytes;
11 import org.junit.Test;
12 import org.slf4j.Logger;
13 import org.slf4j.LoggerFactory;
14
15 import java.io.IOException;
16
17 import static com.google.common.base.Preconditions.checkArgument;
18
19 /**
20  * author: 龚细军
21  * class-aim: HBase客户端操作API使用
22  */
23
24 public class HBaseClientDemo {
25
26     private Logger logger = LoggerFactory.getLogger(HBaseClientDemo.class);
27     private Configuration configuration;
28
29     /**
30      * 插入数据
31      *
32      * @param configuration
33      */
34     public void InsertData(Configuration configuration,
35                            String table_Name, String row,
36                            String col, String col_name, String value) {
37
38         checkArgument(configuration != null, "configuration is null ");
39         checkArgument(!Strings.isNullOrEmpty(table_Name), "tableName is empty");
40         checkArgument(!Strings.isNullOrEmpty(row), "row is empty");
41         checkArgument(!Strings.isNullOrEmpty(col), "col is empty");
42         checkArgument(!Strings.isNullOrEmpty(col_name), "col_name is empty");
43         checkArgument(!Strings.isNullOrEmpty(value), "value is empty");
44         HTable hTable = null;
45
46         try {
47             hTable = new HTable(configuration, table_Name);
48             Put put = new Put(Bytes.toBytes(row));
49             put.add(Bytes.toBytes(col), Bytes.toBytes(col_name), Bytes.toBytes(value));
50             hTable.put(put);
51         } catch (IOException e1) {
52             logger.error("put data Exception", e1);
53         } finally {
54             try {
55                 if (hTable != null) hTable.close();
56             } catch (IOException e) {
57                 logger.error("close HTable Exception", e);
58             }
59         }
60     }
61
62     /**
63      * 获取数据
64      */
65     public Result getData(Configuration configuration,
66                           String table_Name, String row) {
67
68         checkArgument(configuration != null, "configuration is null ");
69         checkArgument(!Strings.isNullOrEmpty(table_Name), "tableName is empty");
70         checkArgument(!Strings.isNullOrEmpty(row), "row is empty");
71         HTable hTable = null;
72         Result result = null;
73         try {
74             hTable = new HTable(configuration, table_Name);
75             Get get = new Get(Bytes.toBytes(row));
76             result = hTable.get(get);
77         } catch (IOException e1) {
78             logger.error("put data Exception", e1);
79         } finally {
80             try {
81                 if (hTable != null) hTable.close();
82             } catch (IOException e) {
83                 logger.error("close HTable Exception", e);
84             }
85         }
86         return result;
87     }
88
89     /**
90      * 获取数据
91      */
92     public Result getData(Configuration configuration,
93                           String table_Name, String row,
94                           String col) {
95
96         checkArgument(configuration != null, "configuration is null ");
97         checkArgument(!Strings.isNullOrEmpty(table_Name), "tableName is empty");
98         checkArgument(!Strings.isNullOrEmpty(row), "row is empty");
99         checkArgument(!Strings.isNullOrEmpty(col), "col is empty");
100         HTable hTable = null;
101         Result result = null;
102         try {
103             hTable = new HTable(configuration, table_Name);
104             Get get = new Get(Bytes.toBytes(row));
105             result = hTable.get(get.addFamily(Bytes.toBytes(col)));
106         } catch (IOException e1) {
107             logger.error("put data Exception", e1);
108         } finally {
109             try {
110                 if (hTable != null) hTable.close();
111             } catch (IOException e) {
112                 logger.error("close HTable Exception", e);
113             }
114         }
115         return result;
116     }
117
118
119     /**
120      * 获取数据
121      */
122     public Result getData(Configuration configuration,
123                           String table_Name, String row,
124                           String col, String col_name) {
125
126         checkArgument(configuration != null, "configuration is null ");
127         checkArgument(!Strings.isNullOrEmpty(table_Name), "tableName is empty");
128         checkArgument(!Strings.isNullOrEmpty(row), "row is empty");
129         checkArgument(!Strings.isNullOrEmpty(col), "col is empty");
130         checkArgument(!Strings.isNullOrEmpty(col_name), "col_name is empty");
131         HTable hTable = null;
132         Result result = null;
133         try {
134             hTable = new HTable(configuration, table_Name);
135             Get get = new Get(Bytes.toBytes(row));
136             result = hTable.get(get.addColumn(Bytes.toBytes(col),
137                     Bytes.toBytes(col_name)));
138         } catch (IOException e1) {
139             logger.error("put data Exception", e1);
140         } finally {
141             try {
142                 if (hTable != null) hTable.close();
143             } catch (IOException e) {
144                 logger.error("close HTable Exception", e);
145             }
146         }
147         return result;
148     }
149
150
151     @Test
152     public void _testPut() {
153         configuration = HBaseConfiguration.create();
154         this.InsertData(configuration, "emp", "2", "emp_col1", "name", "gongxijun");
155     }
156
157     @Test
158     public void _testGet() {
159         configuration = HBaseConfiguration.create();
160         System.out.println(this.getData(configuration, "emp", "1","emp_col","name"));
161     }
162
163 }
　　结果：







1 /home/gongxijun/java/jdk1.7.0_40/bin/java -ea -Didea.launcher.port=7535 -Didea.launcher.bin.path=/home/gongxijun/Qunar/idea-IU-139.1117.1/bin -Dfile.encoding=UTF-8 -classpath 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com.intellij.rt.execution.application.AppMain com.intellij.rt.execution.junit.JUnitStarter -ideVersion5 com.qunar.demo.hbase.HBaseClientDemo,_testGet
2 log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFactory).
3 log4j:WARN Please initialize the log4j system properly.
4 log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
5 keyvalues={1/emp_col:name/1467883522089/Put/vlen=8/mvcc=0}
6
7 Process finished with exit code 0