需要导入jar包
- $HBASE_HOME/lib下的所有jar包
- $HADOOP_HOME/share/hadoop/common的所有jar包
package com.harley.hbase.test;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.NamespaceDescriptor;
import org.apache.hadoop.hbase.TableName;
import org.apache.hadoop.hbase.client.*;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import java.io.IOException;
import java.util.List;
public class HbaseTest{
protected Connection connection = null;
protected Admin admin = null;
/**
* 创建表所需参数
*/
protected String tableName = "mydata:psn2";
protected String cf = "cf";
@Before
public void init()
{
System.out.println("====init....====");
System.setProperty("hadoop.home.dir","D:/Java/bigdata/bigdata/hadoop-3.2.1");
try {
Configuration conf = new Configuration();
conf.set("hbase.zookeeper.quorum","node01:2181,node02:2181,node03:2181");
connection = ConnectionFactory.createConnection(conf);
admin = connection.getAdmin();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* get
*/
@Test
public void get()
{
Table table = null;
try {
table = this.connection.getTable(TableName.valueOf(this.tableName));
/**
* 参数为 rowkey
*/
Get get = new Get("student".getBytes("UTF-8"));
Result result = table.get(get);
String rowkey = new String(result.getRow(),"UTF-8");
String name = new String(result.getColumnLatestCell(this.cf.getBytes("UTF-8"),"name".getBytes("UTF")).getValueArray());
String age = new String(result.getColumnLatestCell(this.cf.getBytes("UTF-8"),"age".getBytes("UTF")).getValueArray());
String gender = new String(result.getColumnLatestCell(this.cf.getBytes("UTF-8"),"gender".getBytes("UTF")).getValueArray());
System.out.println("---rowkey--->"+rowkey+"----name--->"+name+"---age---->"+age+"----gender--->"+gender);
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if(table!=null){
table.close();
table=null;
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* scan
*/
@Test
public void scan()
{
Table table = null;
try {
table = this.connection.getTable(TableName.valueOf(tableName));
Scan scan = new Scan();
ResultScanner scanner = table.getScanner(scan);
int count = 1;
for (Result result : scanner) {
String rowkey = new String(result.getRow(), "UTF-8");
String name = new String(result.getColumnLatestCell(this.cf.getBytes("UTF-8"),"name".getBytes("UTF-8")).getValueArray());
String age = new String(result.getColumnLatestCell(this.cf.getBytes("UTF-8"),"age".getBytes("UTF-8")).toString());
String gender = new String(result.getColumnLatestCell(this.cf.getBytes("UTF-8"),"gender".getBytes("UTF-8")).toString());
System.out.println("--条数:"+count+"---rowkey=>"+rowkey+"----name=>"+name+"----age=>"+age+"----gender=>"+gender);
count++;
}
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if(table!=null){
table.close();
table=null;
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* put
*/
@Test
public void put()
{
Table table = null;
try {
table = this.connection.getTable(TableName.valueOf(tableName));
/**
* rowkey
*/
Put put = new Put("student01".getBytes("UTF-8"));
/**
* 添加键和值
*/
// put.addColumn(this.cf.getBytes("UTF-8"),"name".getBytes("UTF-8"),"老白".getBytes("UTF-8"));
// put.addColumn(this.cf.getBytes("UTF-8"),"age".getBytes("UTF-8"),"32".getBytes("UTF-8"));
// put.addColumn(this.cf.getBytes("UTF-8"),"gender".getBytes("UTF-8"),"男".getBytes("UTF-8"));
put.addColumn(this.cf.getBytes("UTF-8"),"name".getBytes("UTF-8"),"Tom".getBytes("UTF-8"));
put.addColumn(this.cf.getBytes("UTF-8"),"age".getBytes("UTF-8"),"20".getBytes("UTF-8"));
put.addColumn(this.cf.getBytes("UTF-8"),"gender".getBytes("UTF-8"),"man".getBytes("UTF-8"));
/**
* 相当于事务中的commit
*/
table.put(put);
System.out.println("————————put success——————");
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if(table!=null)
table.close();
table=null;
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* create
*/
@Test
public void create()
{
System.out.println("====create....====");
try {
TableDescriptorBuilder tdb = TableDescriptorBuilder.newBuilder(TableName.valueOf(tableName));
ColumnFamilyDescriptor columnFamilyDescriptor = ColumnFamilyDescriptorBuilder.newBuilder(this.cf.getBytes("UTF-8")).build();
TableDescriptor tableDescriptor = tdb.setColumnFamily(columnFamilyDescriptor).build();
this.admin.createTable(tableDescriptor);
System.out.println("-------create success-------");
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* list_namespace
*/
@Test
public void list_namespace()
{
try {
NamespaceDescriptor[] namespaceDescriptors = admin.listNamespaceDescriptors();
int count = 1;
for (NamespaceDescriptor namespaceDescriptor : namespaceDescriptors) {
System.out.println(count+"----------"+namespaceDescriptor.getName());
count++;
}
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* list
*/
@Test
public void list()
{
System.out.println("——————————list....———————————");
try {
List<TableDescriptor> tableDescriptors = admin.listTableDescriptors();
int count=1;
for (TableDescriptor tableDescriptor : tableDescriptors) {
System.out.println(count+"====="+tableDescriptor.getTableName());
count++;
}
} catch (IOException e) {
e.printStackTrace();
}
}
@After
public void after()
{
System.out.println("====destroy....====");
try {
if(admin!=null){
admin.close();
admin=null;
}
if(connection!=null)
{
connection.close();
connection=null;
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
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标签：UTF,String,04,cf,table,java,hbase,null,getBytes From： https://www.cnblogs.com/houhuilinblogs/p/18101602