【六】java代码操作Hbase
package cn.com.hbasedemo.hbasedemo;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.HBaseConfiguration;
import org.apache.hadoop.hbase.HColumnDescriptor;
import org.apache.hadoop.hbase.HTableDescriptor;
import org.apache.hadoop.hbase.KeyValue;
import org.apache.hadoop.hbase.client.Delete;
import org.apache.hadoop.hbase.client.HBaseAdmin;
import org.apache.hadoop.hbase.client.HTable;
import org.apache.hadoop.hbase.client.Put;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.client.Scan;
/**
* <dependency>
* <groupId>org.apache.hbase</groupId>
* <artifactId>hbase</artifactId>
* <version>0.94.7</version>
* </dependency>
* Hello world!
本代码测试通过,使用的hbase版本是0.94.7,通过maven进行jar包管理的
*
*/
public class App {
public static void main(String[] args) throws Exception {
System.out.println("start create table ......");
listTables();
createTable("java_test");
insertData("java_test");
QueryAll("java_test");
//
// deleteRow("java_test", "112233bbbcccc") ;
//
// dropTable("java_test");
}
public static Configuration configuration;
static {
configuration = HBaseConfiguration.create();
configuration.set("hbase.zookeeper.property.clientPort", "2181");
configuration.set("hbase.zookeeper.quorum", "hadoop0");
configuration.set("hbase.master", "hadoop0:60000");
}
/**
* 列出系统中所有的表
* @throws IOException
*/
public static void listTables() throws IOException {
HBaseAdmin hBaseAdmin = new HBaseAdmin(configuration);
System.out.println("start hBaseAdmin ......" + hBaseAdmin);
HTableDescriptor[] tableNames = hBaseAdmin.listTables();
for (HTableDescriptor tableName : tableNames) {
System.out.println(tableName.getNameAsString());
}
}
/**
* 创建表
* @param tableName
* @throws IOException
*/
public static void createTable(String tableName) throws IOException {
System.out.println("start create table ......");
HBaseAdmin hBaseAdmin = new HBaseAdmin(configuration);
if (hBaseAdmin.tableExists(tableName)) {// 如果存在要创建的表,那么先删除,再创建
hBaseAdmin.disableTable(tableName);
hBaseAdmin.deleteTable(tableName);
System.out.println(tableName + " is exist,detele....");
}
HTableDescriptor tableDescriptor = new HTableDescriptor(tableName);
tableDescriptor.addFamily(new HColumnDescriptor("name"));
tableDescriptor.addFamily(new HColumnDescriptor("age"));
tableDescriptor.addFamily(new HColumnDescriptor("address"));
hBaseAdmin.createTable(tableDescriptor);
System.out.println("end create table ......");
}
/**
* 插入数据
* @param tableName
* @throws IOException
*/
public static void insertData(String tableName) throws IOException {
System.out.println("start insert data ......");
HTable table = new HTable(configuration, tableName);
// 一个PUT代表一行数据,再NEW一个PUT表示第二行数据,每行一个唯一的ROWKEY,此处rowkey为put构造方法中传入的值
Put put = new Put("20083051201".getBytes());
put.add("name".getBytes(), null, "丽丽".getBytes());// 本行数据的第一列
put.add("age".getBytes(), null, "24".getBytes());// 本行数据的第三列
put.add("address".getBytes(), null, "华北航天工业学院1".getBytes());// 本行数据的第三列
//增加一个sex列
HBaseAdmin hBaseAdmin = new HBaseAdmin(configuration);
hBaseAdmin.disableTable(tableName);
HColumnDescriptor columnDescriptor = new HColumnDescriptor("sex");
hBaseAdmin.addColumn(tableName, columnDescriptor);
hBaseAdmin.enableTable(tableName);
// 一个PUT代表一行数据,再NEW一个PUT表示第二行数据,每行一个唯一的ROWKEY,此处rowkey为put构造方法中传入的值
Put put1 = new Put("2008305120X".getBytes());
put1.add("name".getBytes(), null, "张3丰".getBytes());// 本行数据的第一列
put1.add("age".getBytes(), null, "22".getBytes());// 本行数据的第三列
put1.add("address".getBytes(), null, "华北航天工业学院".getBytes());// 本行数据的第三列
put1.add("sex".getBytes(), null, "男".getBytes());// 本行数据的第三列
try {
table.put(put);
table.put(put1);
} catch (Exception e) {
e.printStackTrace();
}
System.out.println("end insert data ......");
}
/**
* 删除表
* @param tableName
*/
public static void dropTable(String tableName) {
try {
HBaseAdmin admin = new HBaseAdmin(configuration);
admin.disableTable(tableName);
admin.deleteTable(tableName);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 删除行
* @param tablename
* @param rowkey
*/
@SuppressWarnings({ "rawtypes", "unchecked" })
public static void deleteRow(String tablename, String rowkey) {
try {
HTable table = new HTable(configuration, tablename);
List list = new ArrayList();
Delete d1 = new Delete(rowkey.getBytes());
list.add(d1);
table.delete(list);
System.out.println("删除行成功!");
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 查询表中的数据
* @param tableName
* @throws IOException
*/
public static void QueryAll(String tableName) throws IOException {
HTable table = new HTable(configuration, tableName);
try {
ResultScanner rs = table.getScanner(new Scan());
for (Result r : rs) {
System.out.println("rowkey:" + new String(r.getRow()));
for (KeyValue keyValue : r.raw()) {
System.out.println(new String(keyValue.getFamily())
+ "====:" + new String(keyValue.getValue()));
}
System.out.println("");
}
} catch (Exception e) {
e.printStackTrace();
}
}
}