HBase JAVA API 开发

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本地hosts配置：配置HBase所在集群的hosts，直接复制/etc/hosts下面的内容
到HBase安装节点下载/etc/hbase/conf/hbase-site.xml，复制到JAVA MAVEN项目resources目录
pom文件

<!-- https://mvnrepository.com/artifact/org.apache.hbase/hbase-client --><dependency>    <groupId>org.apache.hbase</groupId>    <artifactId>hbase-client</artifactId>    <version>1.1.2</version></dependency>

4.JAVA代码

package cn.gcks.repository;import cn.gcks.util.CommonUtils;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;/** * HBase API */public class HBaseRepository {    public static Configuration configuration;    public static Connection connection;    public static Admin admin;    // 初始化HBase连接    static {        configuration = HBaseConfiguration.create();        try {            connection = ConnectionFactory.createConnection(configuration);            admin = connection.getAdmin();        } catch (IOException e) {            e.printStackTrace();        }    }    //建表    public static void createTable(String tableNmae, String[] cols) throws IOException {        TableName tableName = TableName.valueOf(tableNmae);        if (admin.tableExists(tableName)) {            System.out.println("talbe is exists!");        } else {            HTableDescriptor hTableDescriptor = new HTableDescriptor(tableName);            for (String col : cols) {                HColumnDescriptor hColumnDescriptor = new HColumnDescriptor(col);                hTableDescriptor.addFamily(hColumnDescriptor);            }            admin.createTable(hTableDescriptor);        }        close();    }    //插入数据    public static void insterRow(String tableName, String rowkey, String colFamily, String col, String val) throws IOException {        Table table = connection.getTable(TableName.valueOf(tableName));        Put put = new Put(Bytes.toBytes(rowkey));        put.addColumn(Bytes.toBytes(colFamily), Bytes.toBytes(col), Bytes.toBytes(val));        table.put(put);        //批量插入        // /* List<Put> putList = new ArrayList<Put>();        puts.add(put);        table.put(putList);*/        table.close();        close();    }    /**     * 根据行键、列族、列限定符查找数据     *     * @param tableName 表名     * @param rowkey    行键     * @param colFamily 列族（默认值为null）     * @param qualifier 列限定符（默认值为null）     * @throws Exception     */    public static Result getData(String tableName, String rowkey, String colFamily, String qualifier) throws Exception {        Table table = connection.getTable(TableName.valueOf(tableName));        Get get = new Get(Bytes.toBytes(rowkey));        if (CommonUtils.isNotBlank(colFamily)) {            if (CommonUtils.isNotBlank(qualifier)) {                // 获取指定列数据                get.addColumn(Bytes.toBytes(colFamily), Bytes.toBytes(qualifier));            } else {                // 获取指定列族数据                get.addFamily(Bytes.toBytes(colFamily));            }        }        Result result = table.get(get);        table.close();        close();        return result;    }    //批量查找数据    public static void scanData(String tableName, String startRow, String stopRow) throws IOException {        Table table = connection.getTable(TableName.valueOf(tableName));        Scan scan = new Scan();        //scan.setStartRow(Bytes.toBytes(startRow));        // scan.setStopRow(Bytes.toBytes(stopRow));        ResultScanner resultScanner = table.getScanner(scan);        for (Result result : resultScanner) {            showCell(result);        }        table.close();        close();    }    /**     * 根据行键、列族、列限定符删除数据     *     * @param tableName 表名     * @param rowkey    行键     * @param colFamily 列族（默认值为null）     * @param qualifier 列限定符（默认值为null）     * @throws Exception     */    public static void deleRow(String tableName, String rowkey, String colFamily, String qualifier) throws IOException {        Table table = connection.getTable(TableName.valueOf(tableName));        Delete delete = new Delete(Bytes.toBytes(rowkey));        if (CommonUtils.isNotBlank(colFamily)) {            if (CommonUtils.isNotBlank(qualifier)) {                // 删除指定列                delete.addColumn(Bytes.toBytes(colFamily), Bytes.toBytes(qualifier));            } else {                //删除指定列族                delete.addFamily(Bytes.toBytes(colFamily));            }        }        table.delete(delete);        // 批量删除        // /* List<Delete> deleteList = new ArrayList<Delete>();        deleteList.add(delete);        table.delete(deleteList);*/        table.close();        close();    }    //查看已有表    public static void listTables() throws IOException {        HTableDescriptor hTableDescriptors[] = admin.listTables();        for (HTableDescriptor hTableDescriptor : hTableDescriptors) {            System.out.println(hTableDescriptor.getNameAsString());        }        close();    }    //删表    public static void deleteTable(String tableName) throws IOException {        TableName tn = TableName.valueOf(tableName);        if (admin.tableExists(tn)) {            admin.disableTable(tn);            admin.deleteTable(tn);        }        close();    }    //格式化输出    public static void showCell(Result result) {        Cell[] cells = result.rawCells();        for (Cell cell : cells) {            System.out.println("===========================");            System.out.println("RowName:" + new String(CellUtil.cloneRow(cell)) + " ");            System.out.println("Timetamp:" + cell.getTimestamp() + " ");            System.out.println("column Family:" + new String(CellUtil.cloneFamily(cell)) + " ");            System.out.println("column qualifier:" + new String(CellUtil.cloneQualifier(cell)) + " ");            System.out.println("value:" + new String(CellUtil.cloneValue(cell)) + " ");            System.out.println("===========================");        }    }    public static void close() {        try {            if (null != admin) admin.close();            if (null != connection) connection.close();        } catch (IOException e) {            e.printStackTrace();        }    }}

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