!17 新增序列化Long类型，自动转为字符串类型，避免前端丢失精度

Merge pull request !17 from 贺小五/feature/serialized

src/main/java/cn/iocoder/dashboard/framework/jackson/config/JacksonConfig.java

@@ -1,18 +1,35 @@
 package cn.iocoder.dashboard.framework.jackson.config;
 
+import cn.iocoder.dashboard.framework.jackson.deser.LocalDateTimeDeserializer;
+import cn.iocoder.dashboard.framework.jackson.ser.LocalDateTimeSerializer;
 import cn.iocoder.dashboard.util.json.JsonUtils;
 import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.module.SimpleModule;
+import com.fasterxml.jackson.databind.ser.std.ToStringSerializer;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 
+import java.time.LocalDateTime;
+
 @Configuration
 public class JacksonConfig {
 
     @Bean
     @SuppressWarnings("InstantiationOfUtilityClass")
     public JsonUtils jsonUtils(ObjectMapper objectMapper) {
+        SimpleModule simpleModule = new SimpleModule();
+        /*
+         * 1. 新增Long类型序列化规则，数值超过2^53-1，在JS会出现精度丢失问题，因此Long自动序列化为字符串类型
+         * 2. 新增LocalDateTime序列化、反序列化规则
+         */
+        simpleModule.addSerializer(Long.class, ToStringSerializer.instance)
+                    .addSerializer(Long.TYPE, ToStringSerializer.instance)
+                    .addSerializer(LocalDateTime.class, LocalDateTimeSerializer.INSTANCE)
+                    .addDeserializer(LocalDateTime.class, LocalDateTimeDeserializer.INSTANCE);
+
+        objectMapper.registerModules(simpleModule);
+
         JsonUtils.init(objectMapper);
         return new JsonUtils();
     }
-
 }

src/main/java/cn/iocoder/dashboard/framework/jackson/deser/LocalDateTimeDeserializer.java

@@ -0,0 +1,26 @@
+package cn.iocoder.dashboard.framework.jackson.deser;
+
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.JsonDeserializer;
+
+import java.io.IOException;
+import java.time.Instant;
+import java.time.LocalDateTime;
+import java.time.ZoneId;
+
+/**
+ * LocalDateTime反序列化规则
+ * <p>
+ * 会将毫秒级时间戳反序列化为LocalDateTime
+ */
+public class LocalDateTimeDeserializer extends JsonDeserializer<LocalDateTime> {
+
+    public static final LocalDateTimeDeserializer INSTANCE = new LocalDateTimeDeserializer();
+
+    @Override
+    public LocalDateTime deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JsonProcessingException {
+        return LocalDateTime.ofInstant(Instant.ofEpochMilli(p.getValueAsLong()), ZoneId.systemDefault());
+    }
+}

src/main/java/cn/iocoder/dashboard/framework/jackson/ser/LocalDateTimeSerializer.java

@@ -0,0 +1,24 @@
+package cn.iocoder.dashboard.framework.jackson.ser;
+
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.databind.JsonSerializer;
+import com.fasterxml.jackson.databind.SerializerProvider;
+
+import java.io.IOException;
+import java.time.LocalDateTime;
+import java.time.ZoneId;
+
+/**
+ * LocalDateTime序列化规则
+ * <p>
+ * 会将LocalDateTime序列化为毫秒级时间戳
+ */
+public class LocalDateTimeSerializer extends JsonSerializer<LocalDateTime> {
+
+    public static final LocalDateTimeSerializer INSTANCE = new LocalDateTimeSerializer();
+
+    @Override
+    public void serialize(LocalDateTime value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
+        gen.writeNumber(value.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli());
+    }
+}