避免前端精度丢失，直接把long变成string返回

src/main/java/com/ycwl/basic/config/JacksonConfiguration.java

@@ -0,0 +1,18 @@
+package com.ycwl.basic.config;
+
+import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
+import org.springframework.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class JacksonConfiguration {
+
+    @Bean
+    public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
+        return builder -> {
+            // 把 Long 类型序列化为 String
+            builder.serializerByType(Long.class, ToStringSerializer.instance);
+        };
+    }
+}