From 915fb015040485d1e6d930d0362b61739daed3ad Mon Sep 17 00:00:00 2001
From: ruying408 <1877972603@qq.com>
Date: Sat, 16 Nov 2024 21:08:47 +0800
Subject: [PATCH] =?UTF-8?q?=E6=94=AF=E6=8C=81Long=E8=B6=85=E8=BF=87?=
 =?UTF-8?q?=E4=B8=80=E5=AE=9A=E9=95=BF=E5=BA=A6=E8=87=AA=E5=8A=A8=E8=BD=AC?=
 =?UTF-8?q?=E5=AD=97=E7=AC=A6=E4=B8=B2=EF=BC=8C=E8=A7=A3=E5=86=B3js?=
 =?UTF-8?q?=E7=B2=BE=E5=BA=A6=E4=B8=A2=E5=A4=B1=E9=97=AE=E9=A2=98?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../cool/core/config/BigNumberSerializer.java | 40 +++++++++++++++++++
 .../com/cool/core/config/JacksonConfig.java   | 28 +++++++++++++
 2 files changed, 68 insertions(+)
 create mode 100644 src/main/java/com/cool/core/config/BigNumberSerializer.java
 create mode 100644 src/main/java/com/cool/core/config/JacksonConfig.java

diff --git a/src/main/java/com/cool/core/config/BigNumberSerializer.java b/src/main/java/com/cool/core/config/BigNumberSerializer.java
new file mode 100644
index 0000000..8707ff5
--- /dev/null
+++ b/src/main/java/com/cool/core/config/BigNumberSerializer.java
@@ -0,0 +1,40 @@
+package com.cool.core.config;
+
+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;
+
+/**
+ * 超出 JS 最大最小值 处理
+ */
+@JacksonStdImpl
+public class BigNumberSerializer extends NumberSerializer {
+
+    /**
+     * 根据 JS Number.MAX_SAFE_INTEGER 与 Number.MIN_SAFE_INTEGER 得来
+     */
+    private static final long MAX_SAFE_INTEGER = 9007199254740991L;
+    private static final long MIN_SAFE_INTEGER = -9007199254740991L;
+
+    /**
+     * 提供实例
+     */
+    public static final BigNumberSerializer INSTANCE = new BigNumberSerializer(Number.class);
+
+    public BigNumberSerializer(Class<? extends Number> rawType) {
+        super(rawType);
+    }
+
+    @Override
+    public void serialize(Number value, JsonGenerator gen, SerializerProvider provider) throws IOException {
+        // 超出范围 序列化位字符串
+        if (value.longValue() > MIN_SAFE_INTEGER && value.longValue() < MAX_SAFE_INTEGER) {
+            super.serialize(value, gen, provider);
+        } else {
+            gen.writeString(value.toString());
+        }
+    }
+}
\ No newline at end of file
diff --git a/src/main/java/com/cool/core/config/JacksonConfig.java b/src/main/java/com/cool/core/config/JacksonConfig.java
new file mode 100644
index 0000000..eba5baf
--- /dev/null
+++ b/src/main/java/com/cool/core/config/JacksonConfig.java
@@ -0,0 +1,28 @@
+package com.cool.core.config;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.module.SimpleModule;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
+import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
+
+import java.math.BigInteger;
+
+@Configuration
+public class JacksonConfig {
+
+    @Bean
+    public MappingJackson2HttpMessageConverter jackson2HttpMessageConverter() {
+        final Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder();
+        final ObjectMapper objectMapper = builder.build();
+        SimpleModule simpleModule = new SimpleModule();
+        // Long,BigInteger 转为 String 防止 js 丢失精度
+        simpleModule.addSerializer(Long.class, BigNumberSerializer.INSTANCE);
+        simpleModule.addSerializer(Long.TYPE, BigNumberSerializer.INSTANCE);
+        simpleModule.addSerializer(BigInteger.class, BigNumberSerializer.INSTANCE);
+        objectMapper.registerModule(simpleModule);
+
+        return new MappingJackson2HttpMessageConverter(objectMapper);
+    }
+}
\ No newline at end of file