请教下如何解决spring boot 返回json 不要被强加转义符

下面是我的代码：

@Configuration

public class WebMvcConfig extends WebMvcConfigurationSupport {

    @Override

    public void configureMessageConverters(List<HttpMessageConverter<?>> converters) {

        Jackson2ObjectMapperBuilder builder = new Jackson2ObjectMapperBuilder()

                .indentOutput(true)

                .serializationInclusion(JsonInclude.Include.NON_NULL)//序列化返回值排除null

                .dateFormat(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"));//时间返回值转化成时间字符串

        converters.add(new StringHttpMessageConverter());

        converters.add(new MappingJackson2HttpMessageConverter(builder.build()));

    }