package org.springblade.core.tool.jackson;
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import com.fasterxml.jackson.core.JsonGenerator;
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import com.fasterxml.jackson.databind.SerializerProvider;
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import com.fasterxml.jackson.databind.annotation.JacksonStdImpl;
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import com.fasterxml.jackson.databind.ser.std.NumberSerializer;
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import java.io.IOException;
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/**
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* 大数值序列化,避免超过js的精度,造成精度丢失
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*
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* @author L.cm
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*/
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@JacksonStdImpl
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public class BigNumberSerializer extends NumberSerializer {
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/**
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* js 最大值为 Math.pow(2, 53),十进制为:9007199254740992
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*/
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private static final long JS_NUM_MAX = 0x20000000000000L;
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/**
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* js 最小值为 -Math.pow(2, 53),十进制为:-9007199254740992
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*/
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private static final long JS_NUM_MIN = -0x20000000000000L;
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/**
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* Static instance that is only to be used for {@link java.lang.Number}.
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*/
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public final static BigNumberSerializer instance = new BigNumberSerializer(Number.class);
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public BigNumberSerializer(Class<? extends Number> rawType) {
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super(rawType);
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}
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@Override
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public void serialize(Number value, JsonGenerator gen, SerializerProvider provider) throws IOException {
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long longValue = value.longValue();
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if (longValue < JS_NUM_MIN || longValue > JS_NUM_MAX) {
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gen.writeString(value.toString());
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} else {
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super.serialize(value, gen, provider);
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}
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}
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}
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