与微信小程序进行交互式，提示出错因为前端传进来的是String，后端接收的是Integer，所以报错

写类型转换器：

@Component
public class ConverterAction implements Converter<String,Integer> {
    @Override
    public Integer convert(String source)
    {
        if(StringUtils.isEmpty(source)){
            return  null;
        }
        Integer in=Integer.getInteger(source);
        return in;
    }

    @Override
    public JavaType getInputType(TypeFactory typeFactory) {
        return null;
    }

    @Override
    public JavaType getOutputType(TypeFactory typeFactory) {
        return null;
    }
}

定义全局类型转换器的配置类

@Configuration
@ComponentScan("com.example.demo.converter")
public class ConerterConfig extends WebMvcConfigurerAdapter {


        @Bean
        @Autowired
        public ConversionService getConversionService(ConverterAction converterAction){
            ConversionServiceFactoryBean factoryBean = new ConversionServiceFactoryBean();

            Set<Converter> converters = new HashSet<Converter>();

            converters.add((Converter) converterAction);

            factoryBean.setConverters(converters);

            return factoryBean.getObject();
        }

}

注意引用正确的转换器类：

import com.fasterxml.jackson.databind.util.Converter;