File Generation

Bloviate can generate flat files — CSV, TSV, or pipe-delimited — straight from column definitions, with no database involved. You control every column’s generator, the row count, and the output format.

A basic CSV

FlatFileGenerator takes an output path and a list of ColumnDefinitions, each pairing a column name with a generator. The default output format is CSV:

import io.bloviate.file.FlatFileGenerator;
import io.bloviate.file.ColumnDefinition;
import io.bloviate.gen.*;
import io.bloviate.util.RandomGenerators;
import java.util.random.RandomGenerator;

RandomGenerator random = RandomGenerators.create(42L);
List<ColumnDefinition> columns = Arrays.asList(
    new ColumnDefinition("id", new IntegerGenerator.Builder(random).build()),
    new ColumnDefinition("name", new SimpleStringGenerator.Builder(random).build()),
    new ColumnDefinition("email", new SimpleStringGenerator.Builder(random).build()),
    new ColumnDefinition("created_at", new DateGenerator.Builder(random).build())
);

new FlatFileGenerator.Builder("output/users")
    .addAll(columns)
    .rows(1000)
    .build()
    .generate();

Other formats

Pass an explicit output(...) to switch the delimiter:

import io.bloviate.file.*;

// Tab-delimited file
new FlatFileGenerator.Builder("data/output")
    .output(new TabDelimitedFile())
    .addAll(columnDefinitions)
    .rows(5000)
    .build()
    .generate();

// Pipe-delimited file
new FlatFileGenerator.Builder("data/output")
    .output(new PipeDelimitedFile())
    .addAll(columnDefinitions)
    .rows(5000)
    .build()
    .generate();

Options

• Output Format: CSV (default), TSV, or pipe-delimited
• Row Count: number of rows to generate (rows(n))
• Custom Column Definitions: full control over each column’s generator

See Generators for the full list of generators you can attach to a column.