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+# Spring Boot JSON
+## Spring Boot JSON简介
+在Spring Boot中为JSON提供了三个集成的内置库：Gson、Jackson、JSON-B。
+> 其中，Jackson是Spring Boot推荐并且默认的JSON库。
+
+Spring Boot项目为Jackson提供了自动装配，并且Jackson是spring-boot-starter-json启动器的一部分。当Jackson依赖在classpath下时，ObjectMapper的bean对象会自动的被配置。
+## 自定义序列化器和反序列化器
+如果使用Jackson进行json数据的序列化和反序列化，你可能需要实现自己的序列化类和反序列化类。可以通过@JsonComponent注解来定义自己的JsonSerializer, JsonDeserializer,JsonObjectSerializer,JsonObjectDeserializer
+```java
+@JsonComponent
+public class MyJsonComponent {
+
+    public static class Serializer extends JsonSerializer<MyObject> {
+
+        @Override
+        public void serialize(MyObject value, JsonGenerator jgen, SerializerProvider serializers) throws IOException {
+            jgen.writeStartObject();
+            jgen.writeStringField("name", value.getName());
+            jgen.writeNumberField("age", value.getAge());
+            jgen.writeEndObject();
+        }
+
+    }
+
+    public static class Deserializer extends JsonDeserializer<MyObject> {
+
+        @Override
+        public MyObject deserialize(JsonParser jsonParser, DeserializationContext ctxt) throws IOException {
+            ObjectCodec codec = jsonParser.getCodec();
+            JsonNode tree = codec.readTree(jsonParser);
+            String name = tree.get("name").textValue();
+            int age = tree.get("age").intValue();
+            return new MyObject(name, age);
+        }
+
+    }
+
+}
+
+@JsonComponent
+public class MyJsonComponent {
+
+    public static class Serializer extends JsonObjectSerializer<MyObject> {
+
+        @Override
+        protected void serializeObject(MyObject value, JsonGenerator jgen, SerializerProvider provider)
+                throws IOException {
+            jgen.writeStringField("name", value.getName());
+            jgen.writeNumberField("age", value.getAge());
+        }
+
+    }
+
+    public static class Deserializer extends JsonObjectDeserializer<MyObject> {
+
+        @Override
+        protected MyObject deserializeObject(JsonParser jsonParser, DeserializationContext context, ObjectCodec codec,
+                JsonNode tree) throws IOException {
+            String name = nullSafeValue(tree.get("name"), String.class);
+            int age = nullSafeValue(tree.get("age"), Integer.class);
+            return new MyObject(name, age);
+        }
+
+    }
+
+}
+```
+## Jackson使用
+Jackson使用ObjectMapper来将json转化为java对象，或者将java对象转化为json。
+### ObjectMapper处理json域字段和java类域字段的映射关系
+