Hbase关于Java常用API举例
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：
/*
* 提示：该行代码过长，系统自动注释不进行高亮。一键复制会移除系统注释
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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
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原始发表：2016-07-07 ，如有侵权请联系 cloudcommunity@tencent.com 删除
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