Java 如何从kafka JSON消息中获取org.apache.kafka.connect.data.Decimal值

我使用debizium将postgresql数据流式传输到Kafka，并使用Java订阅Kafka主题

我收到Kafka消息并得到一个JSON字符串，但一个数值无法识别

JSON是：

{
    "schema":
    {
        "type": "struct",
        "fields": [
        {
            "type": "struct",
            "fields": [
            {
                "type": "string",
                "optional": true,
                "field": "creator"
            },
            {
                "type": "int64",
                "optional": true,
                "name": "io.debezium.time.MicroTimestamp",
                "version": 1,
                "field": "createtime"
            },
            {
                "type": "bytes",
                "optional": true,
                "name": "org.apache.kafka.connect.data.Decimal",
                "version": 1,
                "parameters":
                {
                    "scale": "5",
                    "connect.decimal.precision": "32"
                },
                "field": "familyprice"
            }],
            "optional": true,
            "name": "pssdev.public.order.Value",
            "field": "before"
        },
        {
            "type": "struct",
            "fields": [
            {
                "type": "string",
                "optional": true,
                "field": "creator"
            },
            {
                "type": "int64",
                "optional": true,
                "name": "io.debezium.time.MicroTimestamp",
                "version": 1,
                "field": "createtime"
            },
            {
                "type": "bytes",
                "optional": true,
                "name": "org.apache.kafka.connect.data.Decimal",
                "version": 1,
                "parameters":
                {
                    "scale": "5",
                    "connect.decimal.precision": "32"
                },
                "field": "familyprice"
            }],
            "optional": true,
            "name": "pssdev.public.order.Value",
            "field": "after"
        },
        {
            "type": "struct",
            "fields": [
            {
                "type": "string",
                "optional": true,
                "field": "version"
            },
            {
                "type": "string",
                "optional": true,
                "field": "connector"
            },
            {
                "type": "string",
                "optional": false,
                "field": "name"
            },
            {
                "type": "string",
                "optional": false,
                "field": "db"
            },
            {
                "type": "int64",
                "optional": true,
                "field": "ts_usec"
            },
            {
                "type": "int64",
                "optional": true,
                "field": "txId"
            },
            {
                "type": "int64",
                "optional": true,
                "field": "lsn"
            },
            {
                "type": "string",
                "optional": true,
                "field": "schema"
            },
            {
                "type": "string",
                "optional": true,
                "field": "table"
            },
            {
                "type": "boolean",
                "optional": true,
                "default": false,
                "field": "snapshot"
            },
            {
                "type": "boolean",
                "optional": true,
                "field": "last_snapshot_record"
            },
            {
                "type": "int64",
                "optional": true,
                "field": "xmin"
            }],
            "optional": false,
            "name": "io.debezium.connector.postgresql.Source",
            "field": "source"
        },
        {
            "type": "string",
            "optional": false,
            "field": "op"
        },
        {
            "type": "int64",
            "optional": true,
            "field": "ts_ms"
        }],
        "optional": false,
        "name": "pssdev.public.order.Envelope"
    },
    "payload":
    {
        "before":
        {
            "creator": null,
            "createtime": null,
            "familyprice": null
        },
        "after":
        {
            "creator": "USER1E",
            "createtime": 1554292597815000,
            "familyprice": "W42A"
        },
        "source":
        {
            "version": "0.9.5.Final",
            "connector": "postgresql",
            "name": "pssdev",
            "db": "pf",
            "ts_usec": 1561459811737920,
            "txId": 771604,
            "lsn": 88282458880,
            "schema": "public",
            "table": "order",
            "snapshot": false,
            "last_snapshot_record": null,
            "xmin": null
        },
        "op": "u",
        "ts_ms": 1561459811747
    }
}

familyprice值是

W42A

我不知道如何转换它

数据库中的实际familyprice值为60.00000，列类型为数字（32,5）

请参阅Java客户端

---

您还可以将

decimal.handling.mode

设置为不同的值，这样您可以将小数作为字符串或双精度（如果方便的话）。

这就是我需要的。谢谢。