hbase java API

主方法

 1 import org.apache.commons.lang.StringUtils;
 2 import org.apache.hadoop.conf.Configuration;
 3 import org.apache.hadoop.hbase.Cell;
 4 import org.apache.hadoop.hbase.HBaseConfiguration;
 5 import org.apache.hadoop.hbase.TableName;
 6 import org.apache.hadoop.hbase.client.*;
 7 import org.apache.hadoop.hbase.util.Bytes;
 8 import org.slf4j.Logger;
 9 import org.slf4j.LoggerFactory;
10 
11 import java.io.BufferedReader;
12 import java.io.FileNotFoundException;
13 import java.io.FileReader;
14 import java.io.IOException;
15 import java.util.*;
16 
17 public class HbaseTest {
18 
19     private static Logger log = LoggerFactory.getLogger(HbaseTest.class);
20 
21     static Configuration conf = null;
22     static Connection conn = null;
23     static {
24         conf = HBaseConfiguration.create();
25         conf.set("hbase.zookeeper.quorum", "linux01");
26         conf.set("hbase.zookeeper.property.clientPort", "2181");
27         try {
28             conn = ConnectionFactory.createConnection(conf);
29         } catch (IOException e) {
30             e.printStackTrace();
31         }
32     }
33 
34     public static void main(String[] args) {
35         String tblName = "flights";
36         String[] columnFamilys = {"info"};
37         // 1 创建表
38         // createTable(tblName, columnFamilys);
39 
40         // 2 插入数据
41         /*List<Map<String, Object>> data = getData();//准备多行数据
42         for (Map<String, Object> map : data) {
43             insertRow(TableName.valueOf(tblName), map);
44         }*/
45         //3 修改数据
46         /*Map<String, Object> dataOfUpdate = new HashMap<String, Object>();
47         dataOfUpdate.put("rowKey", "fffc1ebc-236f-4807-a527-a3696f0bb9a9");
48         dataOfUpdate.put("colFamily", "info");
49         dataOfUpdate.put("Dest", "Pudong Shanghai");
50         updateRow(TableName.valueOf(tblName), dataOfUpdate);*/
51         //4 删除数据
52         //removeRow(TableName.valueOf(tblName), "fffc1ebc-236f-4807-a527-a3696f0bb9a9");
53         //deleteColFamily(TableName.valueOf(tblName), "ffc80296-f051-4a8c-9972-845887ee1474",  "info");
54         //deleteCol(TableName.valueOf(tblName), "ff7f07c8-0787-4670-9654-c47d376a6c10", "info", "Dest");
55         //5 查看数据
56         //scanTable(TableName.valueOf("user"), new String[]{"info1", "info2"});
57         getRowData(TableName.valueOf("user"), "1234");
58     }
View Code

准备数据

 1     public static List<Map<String, Object>> getData() {
 2         ArrayList<Map<String, Object>> list = new ArrayList<Map<String, Object>>();
 3         String[] colNames = new String[]{"AvgTicketPrice", "Cancelled", "Carrier", "Dest", "DestAirportID", "Origin", "OriginAirportID"};
 4         try {
 5             BufferedReader br = new BufferedReader(new FileReader("I:\projectImplement\dataWareHouse\test-es\data\630data.csv"));
 6             String line = null;
 7             while ((line = br.readLine()) != null) {
 8                 String[] vals = line.split(",");
 9                 HashMap<String, Object> map = new HashMap<String, Object>();
10                 for (int i = 0; i < colNames.length; i++) {
11                     map.put(colNames[i], vals[i]);
12                 }
13                 map.put("rowKey", UUID.randomUUID().toString());
14                 map.put("colFamily", "info");
15                 list.add(map);
16             }
17         } catch (FileNotFoundException e) {
18             e.printStackTrace();
19         } catch (IOException e) {
20             e.printStackTrace();
21         }
22         return list;
23     }
View Code

创建表

 1     public static void createTable(String tName, String[] columnFamilys) {
 2         if (StringUtils.isBlank(tName) || columnFamilys == null || columnFamilys.length < 0) {
 3             log.error("hbase 表名，列族为空");
 4             return;
 5         }
 6 
 7         TableName hTable = TableName.valueOf(tName);
 8         try {
 9             Admin admin = conn.getAdmin();
10             if (admin.tableExists(hTable)) {
11                 log.info(tName + "表已经存在");
12                 return;
13             }
14 
15             //创建表
16             TableDescriptorBuilder tblDescBuilder = TableDescriptorBuilder.newBuilder(hTable);//表构造器
17             for (String colFamily : columnFamilys) {
18                 ColumnFamilyDescriptorBuilder colFamilyDescBuilder = ColumnFamilyDescriptorBuilder.newBuilder(Bytes.toBytes(colFamily));//列族构造器
19                 ColumnFamilyDescriptor colFamilyDesc = colFamilyDescBuilder.build();
20                 tblDescBuilder.setColumnFamily(colFamilyDesc);//表构造器添加
21             }
22             TableDescriptor tblDesc = tblDescBuilder.build();
23             admin.createTable(tblDesc);
24         } catch (IOException e) {
25             e.printStackTrace();
26             log.error(tName + "创建失败");
27         }
28     }
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插入数据

 1     public static void insertRow(TableName tblName, Map<String, Object> map) {
 2         if (tblName == null || map == null || map.size() <= 2) {
 3             log.info("表名或参数为空");
 4             return;
 5         }
 6 
 7         Table table = null;
 8         try {
 9             table = conn.getTable(tblName);
10             //封装put， 并添加数据
11             Put put = new Put(Bytes.toBytes(map.get("rowKey").toString()));
12             byte[] cf = Bytes.toBytes(map.get("colFamily").toString());
13             for (Map.Entry<String, Object> en : map.entrySet()) {
14                 if ("rowKey".equals(en.getKey()) || "colFamily".equals(en.getKey())) {
15                     continue;
16                 }
17                 put.addColumn(cf, Bytes.toBytes(en.getKey()), Bytes.toBytes(en.getValue().toString()));
18             }
19             table.put(put);//添加数据
20         } catch (IOException e) {
21             e.printStackTrace();
22             log.error(tblName + "插入数据失败， map=" + map);
23         } finally {
24             if (table != null) {
25                 try {
26                     table.close();
27                 } catch (IOException e) {
28                     e.printStackTrace();
29                 } finally {
30                     table = null;
31                 }
32             }
33         }
34     }
View Code

删除数据

 1     public static void removeRow(TableName tblName, String rowKey) {
 2         if (tblName == null || rowKey == null) {
 3             log.info("表名或rowkey为空");
 4             return;
 5         }
 6 
 7         Table hTable = null;
 8         Delete delete = new Delete(Bytes.toBytes(rowKey));
 9         try {
10             hTable = conn.getTable(tblName);
11             hTable.delete(delete);
12         } catch (IOException e) {
13             e.printStackTrace();
14             log.error("删除失败， rowkey=" + rowKey);
15         } finally {
16             if (hTable != null) {
17                 try {
18                     hTable.close();
19                 } catch (IOException e) {
20                     e.printStackTrace();
21                 } finally {
22                     hTable = null;
23                 }
24             }
25         }
26     }
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修改数据

 1     public static void updateRow(TableName tblName, Map<String, Object> map) {
 2         if (tblName == null || map == null || map.size() <= 2) {
 3             log.info("表名或参数为空");
 4             return;
 5         }
 6 
 7         Table hTable = null;
 8         try {
 9             hTable = conn.getTable(tblName);
10             //封装put 新增数据
11             Put put = new Put(Bytes.toBytes(map.get("rowKey").toString()));
12             byte[] cf = Bytes.toBytes(map.get("colFamily").toString());
13             for (Map.Entry<String, Object> en : map.entrySet()) {
14                 if ("rowKey".equals(en.getKey()) || "colFamily".equals(en.getKey())) {
15                     log.info("rowkey 或 colFamily 为空");
16                     continue;
17                 }
18                 put.addColumn(cf, Bytes.toBytes(en.getKey()), Bytes.toBytes(en.getValue().toString()));
19             }
20             hTable.put(put); //新增数据
21         } catch (IOException e) {
22             e.printStackTrace();
23             log.error("修改失败");
24         } finally {
25             if (hTable != null) {
26                 try {
27                     hTable.close();
28                 } catch (IOException e) {
29                     e.printStackTrace();
30                 } finally {
31                     hTable = null;
32                 }
33             }
34         }
35     }
View Code

查询数据

 1     public static void getRowData(TableName tblName, String rowKey) {
 2         if (tblName == null || rowKey == null) {
 3             log.info("表名 或 rowkey为空");
 4             return;
 5         }
 6         Table hTable = null;
 7         ResultScanner rs = null;
 8         try {
 9             hTable = conn.getTable(tblName);
10             Get get = new Get(Bytes.toBytes(rowKey));
11             Result result = hTable.get(get);
12             for (Cell c : result.rawCells()) {
13                 String val = Bytes.toString(c.getValueArray(), c.getValueOffset(), c.getValueLength());
14                 String cf = Bytes.toString(c.getFamilyArray(), c.getFamilyOffset(), c.getFamilyLength());
15                 String col = Bytes.toString(c.getQualifierArray(), c.getQualifierOffset(), c.getQualifierLength());
16                 System.out.printf("tbl=%s, rowkey=%s, cf=%s, col=%s, val=%s
", tblName.getNameAsString(), cf, col, rowKey, val);
17             }
18 
19         } catch (IOException e) {
20             e.printStackTrace();
21             log.info("扫描失败");
22         } finally {
23             if (rs != null) {
24                 rs.close();
25             }
26             if (hTable != null) {
27                 try {
28                     hTable.close();
29                 } catch (IOException e) {
30                     e.printStackTrace();
31                 }
32             }
33         }
34     }
35 
36     public static void scanTable(TableName tblName, String[] colFamilys) {
37         if (tblName == null) {
38             log.info("表名为空");
39             return;
40         }
41         Table hTable = null;
42         ResultScanner rs = null;
43         try {
44             hTable = conn.getTable(tblName);
45             Scan scan = new Scan();
46             for (String cf : colFamilys) {
47                 scan.addFamily(Bytes.toBytes(cf));
48             }
49 
50             rs = hTable.getScanner(scan);
51             // 结果处理， 一个result表示一个rowkey的数据
52             for (Result result : rs) {
53                 String rowkey = Bytes.toString(result.getRow());
54                 for (Cell c : result.rawCells()) {
55                     String val = Bytes.toString(c.getValueArray(), c.getValueOffset(), c.getValueLength());
56                     String cf = Bytes.toString(c.getFamilyArray(), c.getFamilyOffset(), c.getFamilyLength());
57                     String col = Bytes.toString(c.getQualifierArray(), c.getQualifierOffset(), c.getQualifierLength());
58                     System.out.printf("tbl=%s, rowkey=%s, cf=%s, col=%s, val=%s
", tblName.getNameAsString(), cf, col, rowkey, val);
59                 }
60             }
61         } catch (IOException e) {
62             e.printStackTrace();
63             log.info("扫描失败");
64         } finally {
65             if (rs != null) {
66                 rs.close();
67             }
68             if (hTable != null) {
69                 try {
70                     hTable.close();
71                 } catch (IOException e) {
72                     e.printStackTrace();
73                 }
74             }
75         }
76     }
View Code
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原文地址：https://www.cnblogs.com/xiefeichn/p/13173794.html