Use the ob-partition-calculator component

<dependency>
    <groupId>com.oceanbase</groupId>
    <artifactId>ob-partition-calculator</artifactId>
    <version>1.8.0-RELEASE</version>
</dependency>

public void test() throws Exception {
    // You must create a username in the sys tenant in OceanBase Database earlier than V4.0.0.0.
    // You only need to create a username in a business tenant in OceanBase Database V4.0.0.0 and later.
    String user = "";
    // You must create a connection URL in the sys tenant in OceanBase Database earlier than V4.0.0.0.
    // You only need to create a connection URL in a business tenant in OceanBase Database V4.0.0.0 and later.
    String url = "jdbc:oceanbase://ip:port/database?useUnicode=true&characterEncoding=utf8&verifyServerCertificate=false&useSSL=false&rewriteBatchedStatements=true&allowMultiQueries=true";
    // You must create a user password in the sys tenant in OceanBase Database earlier than V4.0.0.0.
    // You only need to create a user password in a business tenant in OceanBase Database V4.0.0.0 and later.
    String password = "";
    // You must create a connection in the sys tenant in OceanBase Database earlier than V4.0.0.0.
    // You only need to create a connection in a business tenant in OceanBase Database V4.0.0.0 and later.
    Connection conn = DriverManager.getConnection(url, user, password);

    // The name of the cluster to connect to.
    String cluster = "";
    // The name of the business tenant to connect to.
    String tenant = "";
    // The name of the business database to connect to.
    String database = "";
    // The name of the table to query.
    String table = defaultTableName;
    // MySQL mode
    TableEntryKey key = new TableEntryKey(cluster, tenant, database, table, ObServerMode.fromMySql("3.2.3.3"));
    // Oracle mode
    // TableEntryKey key = new TableEntryKey(cluster, tenant, database, table, ObServerMode.fromOracle("3.2.3.3"));

    TableEntryExtractor tableEntryExtractor = new TableEntryExtractor();
    TableEntry entry = tableEntryExtractor.queryTableEntry(conn, key,subsequentV4);

    ObPartIdCalculator calculator = new ObPartIdCalculator(entry);

    {
        // You must specify all fields, including non-partitioning key fields, which can be set to null.
        Object[] records = new Object[] {"aaa","123"};
        // Obtain the partition ID of the given record.
        Long partId = calculator.calculatePartId(records);
        System.out.println("===> Partition ID: " + partId);
    }

}

public void test() throws Exception {
    // You must create a username in the sys tenant in OceanBase Database earlier than V4.0.0.0.
    // You only need to create a username in a business tenant in OceanBase Database V4.0.0.0 and later.
    String user = "abc";
    // You must create a connection URL in the sys tenant in OceanBase Database earlier than V4.0.0.0.
    // You only need to create a connection URL in a business tenant in OceanBase Database V4.0.0.0 and later.
    String url = "";
    // You must create a user password in the sys tenant in OceanBase Database earlier than V4.0.0.0.
    // You only need to create a user password in a business tenant in OceanBase Database V4.0.0.0 and later.
    String password = "";
    // You must create a connection in the sys tenant in OceanBase Database earlier than V4.0.0.0.
    // You only need to create a connection in a business tenant in OceanBase Database V4.0.0.0 and later.
    Connection conn = DriverManager.getConnection(url, user, password);

    // The name of the cluster to connect to.
    String cluster = "";
    // The name of the business tenant to connect to.
    String tenant = "";
    // The name of the business database to connect to.
    String database = "";
    // The name of the table to query.
    String table = defaultTableName;
    // MySQL mode
    TableEntryKey key = new TableEntryKey(cluster, tenant, database, table, ObServerMode.fromMySql("3.2.3.3"));
    // Oracle mode
    // TableEntryKey key = new TableEntryKey(cluster, tenant, database, table, ObServerMode.fromOracle("3.2.3.3"));

    TableEntryExtractor tableEntryExtractor = new TableEntryExtractor();
    TableEntry entry = tableEntryExtractor.queryTableEntry(conn, key,subsequentV4);

    ObPartIdCalculator calculator = new ObPartIdCalculator(entry);

    {
        // You must specify all fields, including non-partitioning key fields, which can be set to null.
        Object[] records = new Object[] {"123","456"};
        // Call the ObPartIdCalculator#addRefColumn method to add the names and values of the fields on which the generated column depends to the calculator.
        calculator.addRefColumn(columnName, records[0]);
        // Obtain the partition ID of the given record.
        Long partId = calculator.calculatePartId(records);
        System.out.println("===> Partition ID: " + partId);
    }
}

public void test() throws Exception {
    // You must create a username in the sys tenant in OceanBase Database earlier than V4.0.0.0.
    // You only need to create a username in a business tenant in OceanBase Database V4.0.0.0 and later.
    String user = "";
    // You must create a connection URL in the sys tenant in OceanBase Database earlier than V4.0.0.0.
    // You only need to create a connection URL in a business tenant in OceanBase Database V4.0.0.0 and later.
    String url = "";
    // You must create a user password in the sys tenant in OceanBase Database earlier than V4.0.0.0.
    // You only need to create a user password in a business tenant in OceanBase Database V4.0.0.0 and later.
    String password = "";
    // You must create a connection in the sys tenant in OceanBase Database earlier than V4.0.0.0.
    // You only need to create a connection in a business tenant in OceanBase Database V4.0.0.0 and later.
    Connection conn = DriverManager.getConnection(url, user, password);

    // The name of the cluster to connect to.
    String cluster = "";
    // The name of the business tenant to connect to.
    String tenant = "";
    // The name of the business database to connect to.
    String database = "";
    // The name of the table to query.
    String table = defaultTableName;

    // MySQL mode
    TableEntryKey key = new TableEntryKey(cluster, tenant, database, table, ObServerMode.fromMySql("3.2.3.3"));
    // Oracle mode
    // TableEntryKey key = new TableEntryKey(cluster, tenant, database, table, ObServerMode.fromOracle("3.2.3.3"));
    TableEntryExtractor tableEntryExtractor = new TableEntryExtractor();
    // The TableEntry field records the partition information of the specified table.
    TableEntry entry = tableEntryExtractor.queryTableEntry(conn, key,subsequentV4);


    // Obtain all partitions of the specified table.
    List<Long> partIds = Lists.newArrayList((entry.getPartIdNameMap().keySet());
    // Obtain the address of the leader corresponding to the partition.
    // The value of the subsequentV4 field is a Boolean value. The value true indicates that the version of OceanBase Database is V4.0.0.0 or later. The value false indicates that the version of OceanBase Database is earlier than V4.0.0.0. The default value is false.
    Map<Long, String> map = tableEntryExtractor.queryLeaderLocationMap(conn, entry, partIds, subsequentV4);
}