包的结构
这里注意一定要用JDK 1.8 否则会出现不兼容，报错的问题。
pom.xml
<?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>org.example</groupId>
<artifactId>HbaeDemo</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-client</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-server</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-common</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>commons-logging</groupId>
<artifactId>commons-logging</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
</dependencies>
</project>
java api 代码
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.*;
import org.apache.hadoop.hbase.client.*;
import org.apache.hadoop.hbase.util.Bytes;
import java.io.IOException;
public class HbaseDemo {
private static Admin admin = null;
private static Connection connection = null;
//创建链接
static {
Configuration configuration = HBaseConfiguration.create();
//配置zookeeper的地址
configuration.set("hbase.zookeeper.quorum", "这里填写的是zookeeper集群的地址");
try {
//通过工厂类获取管理员
connection = ConnectionFactory.createConnection(configuration);
admin = connection.getAdmin();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* 关闭链接
*
* @param conn
* @param admin
*/
private void close(Connection conn, Admin admin) {
if (conn != null) {
try {
conn.close();
} catch (IOException e) {
e.printStackTrace();
}
}
if (admin != null) {
try {
admin.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
/**
* 创建表
*
* @param tableName 需要创建的表名字
* @param cfs 列族的名字，可以指定多个
*/
public static void createTable(String tableName, String... cfs) throws IOException {
if (ExistTable(tableName)) {
System.out.println("表名已经存在！");
return;
}
HTableDescriptor hTableDescriptor = new HTableDescriptor(TableName.valueOf(tableName));
for (String cf : cfs) {
HColumnDescriptor hColumnDescriptor = new HColumnDescriptor(cf);
hTableDescriptor.addFamily(hColumnDescriptor);
}
admin.createTable(hTableDescriptor);
System.out.println("表名创建成功！");
}
/**
* 创建表是否存在
*
* @param tableName 表名
* @return 存在返回true，不存在返回false
* @throws IOException
*/
public static boolean ExistTable(String tableName) throws IOException {
boolean exists = admin.tableExists(TableName.valueOf(tableName));
return exists;
}
/**
* 删除表
*
* @param tableName 表名
*/
public static void deleteTable(String tableName) throws IOException {
if (!ExistTable(tableName)) {
System.out.println("表不存在！");
return;
}
admin.disableTable(TableName.valueOf(tableName));
admin.deleteTable(TableName.valueOf(tableName));
System.out.println("表已经被删除！");
}
/**
* 添加/更新数据
*
* @param tableName 表名
* @param rowKey 行键
* @param cf 列族名字
* @param cn 字段名字
* @param value 值
*/
public static void putData(String tableName, String rowKey, String cf, String cn, String value) throws IOException {
Table table = connection.getTable(TableName.valueOf(tableName));
Put put = new Put(Bytes.toBytes(rowKey));
put.addColumn(Bytes.toBytes(cf), Bytes.toBytes(cn), Bytes.toBytes(value));
table.put(put);
table.close();
System.out.println("添加成功！");
}
/**
* 删除数据
*
* @param tableName 表名
* @param rowKey 行键
* @param cf 列族
* @param cn 字段
*/
public static void deleteData(String tableName, String rowKey, String cf, String cn) throws IOException {
Table table = connection.getTable(TableName.valueOf(tableName));
Delete delete = new Delete(Bytes.toBytes(rowKey));
delete.addColumns(Bytes.toBytes(cf), Bytes.toBytes(cn));
table.delete(delete);
table.close();
System.out.println("删除成功！");
}
/**
* 全表扫描
*
* @param tableName 表名字
* @throws IOException
*/
public static void scanTable(String tableName) throws IOException {
Table table = connection.getTable(TableName.valueOf(tableName));
Scan scan = new Scan();
ResultScanner results = table.getScanner(scan);
for (Result result : results) {
Cell[] cells = result.rawCells();
for (Cell cell : cells) {
System.out.println("RK" + Bytes.toString(CellUtil.cloneRow(cell)));
System.out.println("CF" + Bytes.toString(CellUtil.cloneFamily(cell)));
System.out.println("CN" + Bytes.toString(CellUtil.cloneQualifier(cell)));
System.out.println("VALUE" + Bytes.toString(CellUtil.cloneValue(cell)));
}
}
}
/**
* 查询内容
*
* @param tableName
* @param rowKey
*/
public static void getData(String tableName, String rowKey) throws IOException {
Table table = connection.getTable(TableName.valueOf(tableName));
Get get = new Get(Bytes.toBytes(rowKey));
Result result = table.get(get);
Cell[] cells = result.rawCells();
for (Cell cell : cells) {
System.out.println(Bytes.toString(CellUtil.cloneValue(cell)));
}
}
public static void main(String[] args) {
try {
scanTable("ecdefault:EmailLog");
} catch (IOException e) {
e.printStackTrace();
}
}
}