统一将Long类型转String

自定义ObjectMapper

/**
 * 返回Long转换为String
 */
public class JacksonMapper extends ObjectMapper {
    public JacksonMapper() {
        super();
        this.configure(JsonGenerator.Feature.WRITE_BIGDECIMAL_AS_PLAIN, true);
        this.configure(JsonGenerator.Feature.IGNORE_UNKNOWN, true);
        this.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
        this.setSerializationInclusion(Include.NON_NULL);
        SimpleModule simpleModule = new SimpleModule();
        simpleModule.addSerializer(Long.class, ToStringSerializer.instance);
        simpleModule.addSerializer(Long.TYPE, ToStringSerializer.instance);
        simpleModule.addSerializer(long.class, ToStringSerializer.instance);
        registerModule(simpleModule);
    }
}

把MappingJackson2HttpMessageConverter设置给HttpMessageConverter

@Configuration
public class WebConfig implements WebMvcConfigurer {
    @Autowired
    private HttpMessageConverters httpMessageConverters;
    /**
     * MappingJackson2HttpMessageConverter 实现了HttpMessageConverter 接口，
     * httpMessageConverters.getConverters() 返回的对象里包含了MappingJackson2HttpMessageConverter
     * @return
     */
    @Bean
    public MappingJackson2HttpMessageConverter getMappingJackson2HttpMessageConverter() {
        return new MappingJackson2HttpMessageConverter(new JacksonMapper());
    }
    @Override
    public void extendMessageConverters(List<HttpMessageConverter<?>> converters) {
        converters.addAll(httpMessageConverters.getConverters());
    }
}