SpringBoot 字符串参数去除头尾空格

1. URL 和 FORM 表单中的参数

   @ControllerAdvice
   public class ControllerStringParamTrimConfig {
   
       @InitBinder
       public void initBinder(WebDataBinder binder) {
           // 构造方法中 boolean 参数含义为如果是空白字符串, 是否转换为 null
           // 即如果为 true, 那么 " " 会被转换为 null, 否者为 ""
           binder.registerCustomEditor(String.class, new StringTrimmerEditor(true));
       }
   }

2. RequestBody 中 JSON 对象参数

   @Configuration
   public class JacksonConfiguration {
   
       @Bean
       public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
           return jacksonObjectMapperBuilder -> jacksonObjectMapperBuilder
                   .deserializerByType(String.class, new StdScalarDeserializer<String>(String.class) {
   
                       private static final long serialVersionUID = -7069002275820643695L;
                       
                       @Override
                       public String deserialize(JsonParser jsonParser, DeserializationContext ctx)
                               throws IOException {
                           return StringUtils.trimToNull(jsonParser.getValueAsString());
                       }
                   });
       }
   }

3. 原文链接

   ghthou：Spring MVC 配置接收 String 参数时自动去除前后空格