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