1、maven
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-server</artifactId>
<version>1.3.1</version>
</dependency>
<dependency>
<groupId>org.apache.hbase</groupId>
<artifactId>hbase-client</artifactId>
<version>1.3.1</version>
</dependency>
2、代码
public class HBaseDemo {
public static Configuration conf;
public static Connection con = null;
public static void main(String[] args) throws IOException {
boolean t1 = isTableExist("t1");
System.out.println(t1);
}
static {
//1.获得配置文件对象
Configuration conf = HBaseConfiguration.create();
//设置配置参数
conf.set("hbase.zookeeper.quorum", "node01,node02,node03");
//2.建立连接
try {
con = ConnectionFactory.createConnection(conf);
} catch (IOException e) {
e.printStackTrace();
}
}
/*
判断表是否存在
*/
public static boolean isTableExist(String tableName) throws
IOException {
//在 HBase 中管理、访问表需要先创建 HBaseAdmin 对象
Admin admin = con.getAdmin();
return admin.tableExists(TableName.valueOf("t1"));
}
/**
* 创建表
*/
public static void createTable(String tableName, String...
columnFamily) throws
IOException {
HBaseAdmin admin = new HBaseAdmin(conf);
//判断表是否存在
if (isTableExist(tableName)) {
System.out.println("表" + tableName + "已存在");
//System.exit(0);
} else {
//创建表属性对象,表名需要转字节
HTableDescriptor descriptor = new
HTableDescriptor(TableName.valueOf(tableName));
//创建多个列族
for (String cf : columnFamily) {
descriptor.addFamily(new HColumnDescriptor(cf));
}
//根据对表的配置,创建表
admin.createTable(descriptor);
System.out.println("表" + tableName + "创建成功!");
}
}
/**
* 刪除表
*/
public static void dropTable(String tableName) throws
IOException {
HBaseAdmin admin = new HBaseAdmin(conf);
if (isTableExist(tableName)) {
admin.disableTable(tableName);
admin.deleteTable(tableName);
System.out.println("表" + tableName + "删除成功!");
} else {
System.out.println("表" + tableName + "不存在!");
}
}
/**
* 向表中插入數據
*/
public static void addRowData(String tableName, String rowKey,
String columnFamily, String
column, String value) throws IOException {
//创建 HTable 对象
HTable hTable = new HTable(conf, tableName);
//向表中插入数据
Put put = new Put(Bytes.toBytes(rowKey));
//向 Put 对象中组装数据
put.add(Bytes.toBytes(columnFamily), Bytes.toBytes(column),
Bytes.toBytes(value));
hTable.put(put);
hTable.close();
System.out.println("插入数据成功");
}
/**
* * 删除多行数据
*/
public static void deleteMultiRow(String tableName, String... rows)
throws IOException {
HTable hTable = new HTable(conf, tableName);
List<Delete> deleteList = new ArrayList<Delete>();
for (String row : rows) {
Delete delete = new Delete(Bytes.toBytes(row));
deleteList.add(delete);
}
hTable.delete(deleteList);
hTable.close();
}
/**
* *获取所有数据
*/
public static void getAllRows(String tableName) throws IOException {
HTable hTable = new HTable(conf, tableName);
//得到用于扫描 region 的对象
Scan scan = new Scan();
//使用 HTable 得到 resultcanner 实现类的对象
ResultScanner resultScanner = hTable.getScanner(scan);
for (Result result : resultScanner) {
Cell[] cells = result.rawCells();
for (Cell cell : cells) {
//得到 rowkey
System.out.println(" 行 键 :" +
Bytes.toString(CellUtil.cloneRow(cell)));
//得到列族
System.out.println(" 列 族 " +
Bytes.toString(CellUtil.cloneFamily(cell)));
System.out.println(" 列 :" +
Bytes.toString(CellUtil.cloneQualifier(cell)));
System.out.println(" 值 :" +
Bytes.toString(CellUtil.cloneValue(cell)));
}
}
}
/**
* 获取一行数据
*/
public static void getRow(String tableName, String rowKey) throws
IOException {
HTable table = new HTable(conf, tableName);
Get get = new Get(Bytes.toBytes(rowKey));
//get.setMaxVersions();显示所有版本
// get.setTimeStamp();显示指定时间戳的版本
Result result = table.get(get);
for (Cell cell : result.rawCells()) {
System.out.println(" 行 键 :" +
Bytes.toString(result.getRow()));
System.out.println(" 列 族 " +
Bytes.toString(CellUtil.cloneFamily(cell)));
System.out.println(" 列 :" +
Bytes.toString(CellUtil.cloneQualifier(cell)));
System.out.println(" 值 :" +
Bytes.toString(CellUtil.cloneValue(cell)));
System.out.println("时间戳:" + cell.getTimestamp());
}
}
/**
* 获取某一行指定列族
**/
public static void getRowQualifier(String tableName, String rowKey, String family, String qualifier) throws IOException {
HTable table = new HTable(conf, tableName);
Get get = new Get(Bytes.toBytes(rowKey)).addColumn(Bytes.toBytes(family),
Bytes.toBytes(qualifier));
Result result = table.get(get);
for (Cell cell : result.rawCells()) {
System.out.println(" 行 键 :" +
Bytes.toString(result.getRow()));
System.out.println(" 列 族 " +
Bytes.toString(CellUtil.cloneFamily(cell)));
System.out.println(" 列 :" +
Bytes.toString(CellUtil.cloneQualifier(cell)));
System.out.println(" 值 :" +
Bytes.toString(CellUtil.cloneValue(cell)));
}
}
}