content: package com.alibaba.fastjson2.filter;
  
  import com.alibaba.fastjson2.JSON;
  import org.junit.jupiter.api.Test;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  public class ValueFilterTest2 {
      @Test
      public void valueFilter() {
          Bean bean = new Bean();
          bean.id = 100;
          bean.gender = 1;
  
          ValueFilter filter = (Object object, String name, Object value) -> {
              if ("gender".equals(name) && value instanceof Integer) {
                  switch (((Integer) value).intValue()) {
                      case 1:
                          return "男";
                      case 2:
                          return "女";
                      default:
                          break;
                  }
              }
              return value;
          };
  
          JSON.register(Bean.class, filter);
          String str = JSON.toJSONString(bean);
          assertEquals("{\"gender\":\"男\",\"id\":100}", str);
      }
  
      public static class Bean {
          public int id;
          public int gender;
      }
  }
  