asmhatre
c438afc33b
37 runnable examples covering the eight feature posts on ankurm.com, verified against Jackson 3.2.1 on Temurin 21.0.5. Every output committed under docs/ was produced by run-all.sh. Also documents 11 places where the published snippets do not compile or do not behave as printed against a real Jackson 3 build - most notably that writeValueAsString(List<Base>) silently drops the polymorphic type discriminator, so the post's serialised output cannot be read back.
39 lines
1.5 KiB
Java
39 lines
1.5 KiB
Java
package com.ankurm.jackson3.part4custom;
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import tools.jackson.core.JsonGenerator;
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import tools.jackson.databind.SerializationContext;
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import tools.jackson.databind.ser.std.StdSerializer;
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import java.math.RoundingMode;
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/**
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* Post: Custom Serialisers and Mix-ins — https://ankurm.com/jackson-custom-serializer-mixin/
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* Section: "Writing a Custom Serialiser"
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*
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* Three Jackson 3 differences from the code in the post:
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* 1. Package is tools.jackson.databind.ser.std, not com.fasterxml.jackson...
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* 2. The third parameter is SerializationContext, not SerializerProvider.
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* 3. There is no `throws IOException` — JacksonException is unchecked in Jackson 3.
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*
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* (StdSerializer still exists under its old name; only JsonSerializer was renamed,
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* to ValueSerializer. StdSerializer extends ValueSerializer.)
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*/
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public class E01MoneyValueSerializer extends StdSerializer<Money> {
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public E01MoneyValueSerializer() {
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super(Money.class);
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}
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@Override
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public void serialize(Money moneyValue, JsonGenerator jsonGenerator, SerializationContext ctxt) {
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jsonGenerator.writeStartObject();
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// Write the amount rounded to 2 decimal places
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jsonGenerator.writeNumberProperty("amount",
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moneyValue.amount().setScale(2, RoundingMode.HALF_UP));
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// Write the ISO currency code in uppercase
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jsonGenerator.writeStringProperty("currency",
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moneyValue.currencyCode().toUpperCase());
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jsonGenerator.writeEndObject();
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}
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}
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