如何从 Avro Schema 创建有效的 JSON 示例? [英] How to create a valid JSON example from Avro Schema?

问题描述

有一个相当复杂的 Avro 模式(我无法修改).

Got a fairly complicated Avro schema (which I can not modify).

尝试在 Java 中模拟 JSON 示例:

Trying to mock JSON example in java:

GenericRecord genericRecord = AvroUtil.jsonToGenericRecord(jsonData, avroSchema);

一直失败:

Exception in thread "main" org.apache.avro.AvroTypeException: Expected start-union. Got VALUE_STRING

有没有例如可以为任何给定的 Avro 模式提供 JSON 数据示例的在线工具?(这样才能正确匹配)

Is there e.g. online tool that will provide example of JSON data for any given Avro schema? (so that it can match correctly)

尝试模拟 JSON 数据数小时，但仍然没有成功..

Tried mocking JSON data for hours and still no success..

推荐答案

您可以使用 trevni 依赖和测试范围.这里有一个示例代码

You can create random data using trevni dependency and test scope. Here you have a sample code

import org.apache.avro.Schema;
import org.apache.trevni.avro.RandomData;

import java.util.Iterator;

public class JSONExample {
    public static void main(String [] args){
        Schema schema = new Schema.Parser().parse("{\n" +
                "     \"type\": \"record\",\n" +
                "     \"namespace\": \"com.acme\",\n" +
                "     \"name\": \"Test\",\n" +
                "     \"fields\": [\n" +
                "       { \"name\": \"name\", \"type\": \"string\" },\n" +
                "       { \"name\": \"age\", \"type\": \"int\" },\n" +
                "       { \"name\": \"sex\", \"type\": \"string\" },\n" +
                "       { \"name\": \"active\", \"type\": \"boolean\" }\n" +
                "     ]\n" +
                "}");

        Iterator<Object> it = new RandomData(schema, 1).iterator();
        System.out.println(it.next());
    }
}

输出

{"name": "cjnyvbmetf", "age": -1757126879, "sex": "", "active": false}

maven 依赖

<dependencies>
    <dependency>
        <groupId>org.apache.avro</groupId>
        <artifactId>avro</artifactId>
        <version>1.8.2</version>
    </dependency>
    <dependency>
        <groupId>org.apache.avro</groupId>
        <artifactId>trevni-core</artifactId>
        <classifier>tests</classifier>
        <version>1.8.2</version>
    </dependency>
    <dependency>
        <groupId>org.apache.avro</groupId>
        <artifactId>trevni-avro</artifactId>
        <classifier>tests</classifier>
        <version>1.8.2</version>
    </dependency>
</dependencies>

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