avro反序列化

来源：互联网发布：薪酬调查数据分析编辑：程序博客网时间：2024/04/26 12:37

avro反序列化的大概思路是：

维护一个DecoderFactory和BinaryDecoder，BinaryDecoder可以复用
维护一个GenericDatumReader和GenericRecord，GenericRecord可以复用
将byte[]传给decoderFactory
将decoderFactory传给genericDatumReader，将数据读到genericRecord里面
返回genericRecord

import org.apache.avro.Schema;import org.apache.avro.generic.GenericDatumReader;import org.apache.avro.generic.GenericRecord;import org.apache.avro.io.BinaryDecoder;import org.apache.avro.io.DecoderFactory;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import java.io.IOException;/** * Created by fhqplzj on 16-10-20 at 下午4:13. */public class AvroDeserialization {    Logger logger = LoggerFactory.getLogger(AvroDeserialization.class);    private GenericDatumReader<GenericRecord> genericDatumReader;    private GenericRecord genericRecord;    private DecoderFactory decoderFactory;    private BinaryDecoder binaryDecoder;    public AvroDeserialization(Schema schema) {        genericDatumReader = new GenericDatumReader<>(schema);        genericRecord = null;        decoderFactory = DecoderFactory.get();        binaryDecoder = null;    }    public GenericRecord fromBytes(byte[] bytes) {        binaryDecoder = decoderFactory.binaryDecoder(bytes, binaryDecoder);        try {            genericRecord = genericDatumReader.read(genericRecord, binaryDecoder);            return genericRecord;        } catch (IOException e) {            logger.error(e.getMessage());            return null;        }    }}

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