From 44089542159aeb7875b88512f33a5ee5f6461139 Mon Sep 17 00:00:00 2001
From: liaozan <378024053@qq.com>
Date: Wed, 9 Aug 2023 17:15:02 +0800
Subject: [PATCH] Serialize Long using string if exceeds the front-end maximum

---
 .../common/web/ObjectMapperConfiguration.java | 21 ++++++++++++
 .../web/WebCommonAutoConfiguration.java       |  3 +-
 .../web/support/LongToStringSerializer.java   | 33 +++++++++++++++++++
 3 files changed, 56 insertions(+), 1 deletion(-)
 create mode 100644 commons/web-common/src/main/java/com/schbrain/common/web/ObjectMapperConfiguration.java
 create mode 100644 commons/web-common/src/main/java/com/schbrain/common/web/support/LongToStringSerializer.java

diff --git a/commons/web-common/src/main/java/com/schbrain/common/web/ObjectMapperConfiguration.java b/commons/web-common/src/main/java/com/schbrain/common/web/ObjectMapperConfiguration.java
new file mode 100644
index 0000000..ec754bd
--- /dev/null
+++ b/commons/web-common/src/main/java/com/schbrain/common/web/ObjectMapperConfiguration.java
@@ -0,0 +1,21 @@
+package com.schbrain.common.web;
+
+import com.schbrain.common.web.support.LongToStringSerializer;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer;
+import org.springframework.context.annotation.Bean;
+import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
+
+/**
+ * @author liaozan
+ * @since 2023/8/9
+ */
+@ConditionalOnClass(Jackson2ObjectMapperBuilder.class)
+public class ObjectMapperConfiguration {
+
+    @Bean
+    public Jackson2ObjectMapperBuilderCustomizer jacksonCustomizer() {
+        return builder -> builder.serializerByType(Long.class, LongToStringSerializer.instance);
+    }
+
+}
diff --git a/commons/web-common/src/main/java/com/schbrain/common/web/WebCommonAutoConfiguration.java b/commons/web-common/src/main/java/com/schbrain/common/web/WebCommonAutoConfiguration.java
index f658e37..5c53825 100644
--- a/commons/web-common/src/main/java/com/schbrain/common/web/WebCommonAutoConfiguration.java
+++ b/commons/web-common/src/main/java/com/schbrain/common/web/WebCommonAutoConfiguration.java
@@ -29,7 +29,8 @@ import java.util.List;
         AuthenticationConfiguration.class,
         ExceptionHandingConfiguration.class,
         ServletComponentConfiguration.class,
-        CorsFilterConfiguration.class
+        CorsFilterConfiguration.class,
+        ObjectMapperConfiguration.class
 })
 public class WebCommonAutoConfiguration {
 
diff --git a/commons/web-common/src/main/java/com/schbrain/common/web/support/LongToStringSerializer.java b/commons/web-common/src/main/java/com/schbrain/common/web/support/LongToStringSerializer.java
new file mode 100644
index 0000000..f272aba
--- /dev/null
+++ b/commons/web-common/src/main/java/com/schbrain/common/web/support/LongToStringSerializer.java
@@ -0,0 +1,33 @@
+package com.schbrain.common.web.support;
+
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.databind.SerializerProvider;
+import com.fasterxml.jackson.databind.ser.std.StdSerializer;
+
+import java.io.IOException;
+
+/**
+ * @author liaozan
+ * @since 2023/8/9
+ */
+public class LongToStringSerializer extends StdSerializer<Long> {
+
+    public static final LongToStringSerializer instance = new LongToStringSerializer();
+
+    private static final double FRONT_MAX_VALUE = Math.pow(2, 53);
+    private static final long serialVersionUID = -1872783127429540811L;
+
+    protected LongToStringSerializer() {
+        super(Long.class);
+    }
+
+    @Override
+    public void serialize(Long value, JsonGenerator gen, SerializerProvider provider) throws IOException {
+        if (value.doubleValue() > FRONT_MAX_VALUE) {
+            gen.writeString(value.toString());
+        } else {
+            gen.writeNumber(value);
+        }
+    }
+
+}
-- 
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