Jackson is "the Java JSON library" or "the best JSON parser for Java". Or simply as "JSON for Java".

Jackson Databind Source Code files are provided in the source packge (jackson-databind-2.12.4-sources.jar). You can download it at Jackson Maven Website.

You can also browse Jackson Databind Source Code below:

⏎ com/fasterxml/jackson/databind/ser/std/InetAddressSerializer.java

package com.fasterxml.jackson.databind.ser.std;

import java.io.IOException;
import java.net.InetAddress;

import com.fasterxml.jackson.annotation.JsonFormat;
import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.core.type.WritableTypeId;
import com.fasterxml.jackson.databind.BeanProperty;
import com.fasterxml.jackson.databind.JsonMappingException;
import com.fasterxml.jackson.databind.JsonSerializer;
import com.fasterxml.jackson.databind.SerializerProvider;
import com.fasterxml.jackson.databind.jsontype.TypeSerializer;
import com.fasterxml.jackson.databind.ser.ContextualSerializer;

/**
 * Simple serializer for {@link java.net.InetAddress}. Main complexity is
 * with registration, since same serializer is to be used for sub-classes.
 *<p>
 * Since 2.9 allows use of {@link JsonFormat} configuration (annotation,
 * per-type defaulting) so that if <code>JsonFormat.Shape.NUMBER</code>
 * (or <code>ARRAY</code>) is used, will serialize as "host address"
 * (dotted numbers) instead of simple conversion.
 */
@SuppressWarnings("serial")
public class InetAddressSerializer
    extends StdScalarSerializer<InetAddress>
    implements ContextualSerializer
{
    /**
     * @since 2.9
     */
    protected final boolean _asNumeric;

    public InetAddressSerializer() {
        this(false);
    }

    /**
     * @since 2.9
     */
    public InetAddressSerializer(boolean asNumeric) {
        super(InetAddress.class);
        _asNumeric = asNumeric;
    }

    @Override
    public JsonSerializer<?> createContextual(SerializerProvider serializers,
            BeanProperty property) throws JsonMappingException
    {
        JsonFormat.Value format = findFormatOverrides(serializers,
                property, handledType());
        boolean asNumeric = false;
        if (format != null) {
            JsonFormat.Shape shape = format.getShape();
            if (shape.isNumeric() || shape == JsonFormat.Shape.ARRAY) {
                asNumeric = true;
            }
        }
        if (asNumeric != _asNumeric) {
            return new InetAddressSerializer(asNumeric);
        }
        return this;
    }

    @Override
    public void serialize(InetAddress value, JsonGenerator g, SerializerProvider provider) throws IOException
    {
        String str;

        if (_asNumeric) { // since 2.9
            str = value.getHostAddress();
        } else {
            // Ok: get textual description; choose "more specific" part
            str = value.toString().trim();
            int ix = str.indexOf('/');
            if (ix >= 0) {
                if (ix == 0) { // missing host name; use address
                    str = str.substring(1);
                } else { // otherwise use name
                    str = str.substring(0, ix);
                }
            }
        }
        g.writeString(str);
    }

    @Override
    public void serializeWithType(InetAddress value, JsonGenerator g,
            SerializerProvider provider, TypeSerializer typeSer) throws IOException
    {
        // Better ensure we don't use specific sub-classes...
        WritableTypeId typeIdDef = typeSer.writeTypePrefix(g,
                typeSer.typeId(value, InetAddress.class, JsonToken.VALUE_STRING));
        serialize(value, g, provider);
        typeSer.writeTypeSuffix(g, typeIdDef);
    }
}

⏎ com/fasterxml/jackson/databind/ser/std/InetAddressSerializer.java

 

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