SpringBoot去除请求参数中的表情符号和首尾空白字符

一、配置

1. 定义正则表达式

   /**
    * 正则静态常量
    */
   public interface PatternConstant {
   
       /**
        * 匹配表情符号
        **/
       Pattern EMOJI = Pattern.compile("[\ud83c\udc00-\ud83c\udfff]|[\ud83d\udc00-\ud83d\udfff]|[\u2600-\u27ff]");
   
   }
   

2. RequestBody 中 JSON 对象参数

   @Configuration
   public class JacksonConfig {
   
         @Bean
       public Jackson2ObjectMapperBuilderCustomizer jackson2ObjectMapperBuilderCustomizer() {
           return jacksonMapper -> jacksonMapper.deserializerByType(String.class, new StdScalarDeserializer<String>(String.class) {
               @Override
               public String deserialize(JsonParser jsonParser, DeserializationContext ctx) throws IOException {
                   String text = jsonParser.getValueAsString();
                   if (text == null) {
                       return null;
                   }
   
                   Matcher matcher = PatternConstant.EMOJI.matcher(text);
                   return matcher.replaceAll("").trim();
               }
   
           });
       }
       
   }
   

3. URL 和 FORM 表单中的参数

   /**
    * 去除请求参数中的表情符号和首尾空白字符
    */
   @ControllerAdvice
   public class WebMvcAutoTrimEmojiConfig {
   
       
       @InitBinder
       public void initWebDataBinder(WebDataBinder binder) {
        //当值为" "时,是否转换为null
           StringTrimmerEditor propertyEditor = new StringTrimEmojiEditor(true);
            // 为 String 类对象注册编辑器
           binder.registerCustomEditor(String.class, propertyEditor);
       }
   
       public static class StringTrimEmojiEditor extends PropertyEditorSupport {
   
           /**
            * 当值为" "时,是否转换为null
            */
           private final boolean emptyAsNull;
   
           public StringTrimEmojiEditor(boolean emptyAsNull) {
               this.emptyAsNull = emptyAsNull;
           }
   
           @Override
           public void setAsText(@Nullable String text) {
               if (text == null) {
                   setValue(null);
               } else {
   
                   Matcher matcher = PatternConstant.EMOJI.matcher(text);
                   String value = matcher.replaceAll("").trim();
   
                   if (this.emptyAsNull && value.isEmpty()) {
                       super.setValue(null);
                   } else {
                       super.setValue(value);
                   }
               }
           }
   
           @Override
           public String getAsText() {
               Object value = getValue();
               return (value != null ? value.toString() : "");
           }
   
       }
   
   }
   

提示: 如果只去除首尾空白字符可以直接使用 org.springframework.beans.propertyeditors.StringTrimmerEditor

二、测试

@RestController
@RequestMapping(value = "/")
public class SpringTrimController {

    @GetMapping("/url")
    public String urlParam(String name) {
        return name;
    }

    @PostMapping("/form")
    public User formParam(User user) {
        return user;
    }

    @PostMapping(value = "/body")
    public User bodyParam(@RequestBody User user) {
        return user;
    }

}