feature-1.0-img:system添加序列化配置

bnyer-services/bnyer-system/src/main/java/com/bnyer/system/config/JsonConfig.java

@@ -0,0 +1,36 @@
+package com.bnyer.system.config;
+
+import com.bnyer.system.serializer.LongToStringSerializer;
+import com.fasterxml.jackson.databind.DeserializationFeature;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.module.SimpleModule;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.context.annotation.Primary;
+import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
+
+/**
+ * 解决雪花Id长度超过16位前端传入精度丢失的问题
+ */
+@Configuration
+public class JsonConfig {
+    @Bean
+    @Primary
+    @ConditionalOnMissingBean(ObjectMapper.class)
+    public ObjectMapper jacksonObjectMapper(Jackson2ObjectMapperBuilder builder)
+    {
+        ObjectMapper objectMapper = builder.createXmlMapper(false).build();
+        // 全局配置序列化返回 JSON 处理
+        SimpleModule simpleModule = new SimpleModule();
+        //JSON Long ==> String
+        //自定义字符串转化规则ToStringSerializer换成自定义的LongToStringSerializer
+        simpleModule.addSerializer(Long.class, LongToStringSerializer.instance);
+        simpleModule.addSerializer(Long.TYPE, LongToStringSerializer.instance);
+
+        objectMapper.registerModule(simpleModule);
+        //参数在bean中没有的情况处理
+        objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
+        return objectMapper;
+    }
+}

bnyer-services/bnyer-system/src/main/java/com/bnyer/system/serializer/LongToStringSerializer.java

@@ -0,0 +1,24 @@
+package com.bnyer.system.serializer;
+
+import com.fasterxml.jackson.core.JsonGenerator;
+import com.fasterxml.jackson.databind.JsonSerializer;
+import com.fasterxml.jackson.databind.SerializerProvider;
+
+import java.io.IOException;
+
+public class LongToStringSerializer extends JsonSerializer<Long> {
+    public static final LongToStringSerializer instance = new LongToStringSerializer();
+
+    @Override
+    public void serialize(Long id, JsonGenerator jsonGenerator, SerializerProvider serializerProvider) throws IOException {
+        if(id != null){
+            //长度小于某个值的，还是保持long类型
+            if(id <  10000000000000000L){
+                jsonGenerator.writeNumber(id);
+            }else {
+                //长度超过某个值的，转化为字符串
+                jsonGenerator.writeString(id.toString());
+            }
+        }
+    }
+}