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avro 轉(zhuǎn) json

Avro是一種序列化數(shù)據(jù)的數(shù)據(jù)格式,它使用二進(jìn)制格式編碼數(shù)據(jù)。它的優(yōu)勢(shì)在于可以有效地壓縮數(shù)據(jù)并且提供了快速的反序列化能力。然而,當(dāng)我們需要使用JSON格式進(jìn)行數(shù)據(jù)交換時(shí),我們需要把數(shù)據(jù)從Avro格式轉(zhuǎn)換成JSON格式。

{
"namespace": "example.avro",
"type": "record",
"name": "User",
"fields": [
{"name": "name", "type": "string"},
{"name": "email", "type": ["string", "null"]},
{"name": "age", "type": ["int", "null"]}
]
}

以上是一個(gè)Avro數(shù)據(jù)格式的示例代碼。我們可以使用Avro提供的Java編程接口來(lái)讀取這個(gè)數(shù)據(jù)格式的數(shù)據(jù),并把它轉(zhuǎn)換成JSON格式。

import org.apache.avro.Schema;
import org.apache.avro.generic.GenericDatumReader;
import org.apache.avro.generic.GenericRecord;
import org.apache.avro.io.DatumReader;
import org.apache.avro.io.Decoder;
import org.apache.avro.io.DecoderFactory;
import org.json.JSONObject;
public class AvroToJsonConverter {
public static String convert(byte[] avroData) {
Schema.Parser parser = new Schema.Parser();
Schema schema = parser.parse("{" +
"\"namespace\": \"example.avro\"," +
"\"type\": \"record\"," +
"\"name\": \"User\"," +
"\"fields\": [" +
"{\"name\": \"name\", \"type\": \"string\"}," +
"{\"name\": \"email\", \"type\": [\"string\", \"null\"]}," +
"{\"name\": \"age\", \"type\": [\"int\", \"null\"]}" +
"]" +
"}");
DatumReaderdatumReader = new GenericDatumReader<>(schema);
Decoder decoder = DecoderFactory.get().binaryDecoder(avroData, null);
GenericRecord record = datumReader.read(null, decoder);
JSONObject json = new JSONObject(record.toString());
return json.toString();
}
}

以上是一個(gè)Java代碼示例,可以將Avro轉(zhuǎn)換成JSON。該代碼首先定義了Avro數(shù)據(jù)格式的schema,然后使用Avro的Java編程接口讀取Avro數(shù)據(jù),然后使用JSON API將其轉(zhuǎn)換成JSON格式并返回。