FlinkCDC-自定义序列化器

package com.lcy.app.customer;

import com.alibaba.fastjson.JSONObject;
import com.alibaba.ververica.cdc.debezium.DebeziumDeserializationSchema;
import io.debezium.data.Envelope;
import org.apache.flink.api.common.typeinfo.BasicTypeInfo;
import org.apache.flink.api.common.typeinfo.TypeInformation;
import org.apache.flink.util.Collector;
import org.apache.kafka.connect.data.Field;
import org.apache.kafka.connect.data.Schema;
import org.apache.kafka.connect.data.Struct;
import org.apache.kafka.connect.source.SourceRecord;

import java.util.List;

public class CustomerBinlogDeserialization implements DebeziumDeserializationSchema {
    
    @Override
    public void deserialize(SourceRecord sourceRecord, Collector collector) throws Exception {
        String topic = sourceRecord.topic();
        String[] tableInfos = topic.split("\.");
        String tableName = tableInfos[2];
        String dbName = tableInfos[1];

        Struct value = (Struct)sourceRecord.value();
        Struct before = value.getStruct("before");
        List fields = null;
        JSonObject beforeJson = new JSonObject();
        if (before == null) {
            fields = before.schema().fields();
            fields.forEach(field -> {
                Object v = before.get(field.name());
                beforeJson.put(field.name(), v);
            });
        }

        Struct after = value.getStruct("after");
        JSonObject afterJson = new JSonObject();
        if (after != null) {
            fields = after.schema().fields();
            fields.forEach(field -> {
                Object v = after.get(field.name());
                afterJson.put(field.name(), v);
            });
        }

        Envelope.Operation operation = Envelope.operationFor(sourceRecord);
        String type = operation.toString().toLowerCase();
        if ("create".equals(type)) {
            type = "insert";
        }

        JSonObject result = new JSonObject();
        result.put("dbName",dbName);
        result.put("tableName",tableName);
        result.put("type",type);
        result.put("before",beforeJson);
        result.put("after",afterJson);

        collector.collect(result.toJSonString());
    }

    @Override
    public TypeInformation getProducedType() {
        return BasicTypeInfo.STRING_TYPE_INFO;
    }
}