如何在hive元数据库中获取hive表名及字段名

以下是在Hive元数据库中获取Hive表名及字段名的Java代码示例：

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

public class HiveMetadata {
    private static String driverName = "org.apache.hive.jdbc.HiveDriver";

    public static void main(String[] args) throws SQLException {
        try {
            Class.forName(driverName);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
            System.exit(1);
        }
        Connection con = DriverManager.getConnection("jdbc:hive2://localhost:10000/default", "", "");
        Statement stmt = con.createStatement();
        String tableName = "your_table_name";
        String sql = "describe " + tableName;
        ResultSet res = stmt.executeQuery(sql);
        while (res.next()) {
            System.out.println("Column names : " + res.getString(1));
        }
    }
}

以上代码使用JDBC连接到Hive服务器，并使用`describe`命令获取表的元数据信息，然后遍历结果集以获取表的列名。