当 Spring Boot 的 json 库为 jackson 时，可以使用以下配置属性（对应 JacksonProperties 类）：
spring.jackson.date-format= # Date format string or a fully-qualified date format class name. For instance, `yyyy-MM-dd HH:mm:ss`. spring.jackson.default-property-inclusion= # Controls the inclusion of properties during serialization. Configured with one of the values in Jackson's JsonInclude.Include enumeration. spring.jackson.deserialization.*= # Jackson on/off features that affect the way Java objects are deserialized. spring.jackson.generator.*= # Jackson on/off features for generators. spring.jackson.joda-date-time-format= # Joda date time format string. If not configured, "date-format" is used as a fallback if it is configured with a format string. spring.jackson.locale= # Locale used for formatting. spring.jackson.mapper.*= # Jackson general purpose on/off features. spring.jackson.parser.*= # Jackson on/off features for parsers. spring.jackson.property-naming-strategy= # One of the constants on Jackson's PropertyNamingStrategy. Can also be a fully-qualified class name of a PropertyNamingStrategy subclass. spring.jackson.serialization.*= # Jackson on/off features that affect the way Java objects are serialized. spring.jackson.time-zone= # Time zone used when formatting dates. For instance, "America/Los_Angeles" or "GMT+10". spring.jackson.visibility.*= # Jackson visibility thresholds that can be used to limit which methods (and fields) are auto-detected. GSON 配置当 Spring Boot 的 json 库为 gson 时，可以使用以下配置属性（对应 GsonProperties 类）：
spring.gson.date-format= # Format to use when serializing Date objects. spring.gson.disable-html-escaping= # Whether to disable the escaping of HTML characters such as '<', '>', etc. spring.gson.disable-inner-class-serialization= # Whether to exclude inner classes during serialization. spring.gson.enable-complex-map-key-serialization= # Whether to enable serialization of complex map keys (i.e. non-primitives). spring.gson.exclude-fields-without-expose-annotation= # Whether to exclude all fields from consideration for serialization or deserialization that do not have the "Expose" annotation. spring.gson.field-naming-policy= # Naming policy that should be applied to an object's field during serialization and deserialization. spring.gson.generate-non-executable-json= # Whether to generate non executable JSON by prefixing the output with some special text. spring.gson.lenient= # Whether to be lenient about parsing JSON that doesn't conform to RFC 4627. spring.gson.long-serialization-policy= # Serialization policy for Long and long types. spring.gson.pretty-printing= # Whether to output serialized JSON that fits in a page for pretty printing. spring.gson.serialize-nulls= # Whether to serialize null fields. Spring Boot 中使用 Fastjson国内很多的 Java 程序员更喜欢使用阿里的 fastjson 作为 json lib。那么，如何在 Spring Boot 中将其替换默认的 jackson 库呢？
你需要做如下处理：
（1）引入 fastjson jar 包：
<dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.54</version> </dependency>（2）实现 WebMvcConfigurer 接口，自定义 configureMessageConverters 接口。如下所示：
@Configuration public class WebMvcConfig implements WebMvcConfigurer { private final Logger log = LoggerFactory.getLogger(this.getClass()); /** * 自定义消息转换器 * @param converters */ @Override public void configureMessageConverters(List<HttpMessageConverter<?>> converters) { // 清除默认 Json 转换器 converters.removeIf(converter -> converter instanceof MappingJackson2HttpMessageConverter); // 配置 FastJson FastJsonConfig config = new FastJsonConfig(); config.setSerializerFeatures(SerializerFeature.QuoteFieldNames, SerializerFeature.WriteEnumUsingToString, SerializerFeature.WriteMapNullValue, SerializerFeature.WriteDateUseDateFormat, SerializerFeature.DisableCircularReferenceDetect); // 添加 FastJsonHttpMessageConverter FastJsonHttpMessageConverter fastJsonHttpMessageConverter = new FastJsonHttpMessageConverter(); fastJsonHttpMessageConverter.setFastJsonConfig(config); List<MediaType> fastMediaTypes = new ArrayList<>(); fastMediaTypes.add(MediaType.APPLICATION_JSON_UTF8); fastJsonHttpMessageConverter.setSupportedMediaTypes(fastMediaTypes); converters.add(fastJsonHttpMessageConverter); // 添加 StringHttpMessageConverter，解决中文乱码问题 StringHttpMessageConverter stringHttpMessageConverter = new StringHttpMessageConverter(Charset.forName("UTF-8")); converters.add(stringHttpMessageConverter); } // ... } 示例源码完整示例：源码
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