记一次使用fastjson转字符串出现的问题

   @Transactional(rollbackFor = Exception.class)
    public ResultEnum add(Map<String, String> addMap) {
       
      		....................
            List<Map<String, Object>> raw_list = parseJson(userid);
          
                Map<String, Object> new_Cus = new HashMap<>();
                new_Cus.put(KEY_ID, (raw_list.size() + 1) + "");
                new_Cus.put(KEY_NAME, addMap.get(KEY_NAME));
                new_Cus.put(KEY_DISPLAY, addMap.get(KEY_DISPLAY));
                new_Cus.put(KEY_STATE, "1");
                
                new_Cus.put(KEY_AIDS, null);
                raw_list.add(new_Cus);
              
                String jsonStr = JSON.toJSONString(raw_list);
             
     			 ........................
    }

如上，在将rawList转为json字符串的时候，发现aids字段丢失了

解决：
这里需要给toJSONString方法添加SerializerFeature属性

SerializerFeature属性的枚举类如下：

修改后：

/**
     * 添加分类
     * @param addMap
     * @return
     */
    @Transactional(rollbackFor = Exception.class)
    public ResultEnum add(Map<String, String> addMap) {
       .............
            List<Map<String, Object>> raw_list = parseJson(userid);
           ......
                Map<String, Object> new_Cus = new HashMap<>();
                new_Cus.put(KEY_ID, (raw_list.size() + 1) + "");
                new_Cus.put(KEY_NAME, addMap.get(KEY_NAME));
                new_Cus.put(KEY_DISPLAY, addMap.get(KEY_DISPLAY));
                new_Cus.put(KEY_STATE, "1");
                
                List<String> aids = new ArrayList<>();
                new_Cus.put(KEY_AIDS, aids);
                raw_list.add(new_Cus);
                /*
                    WriteMapNullValue:是否输出值为null的字段,默认为false
                    WriteNullListAsEmpty:List字段如果为null,输出为[],而非null
                 */
                String jsonStr = JSON.toJSONString(raw_list, SerializerFeature.WriteMapNullValue,
                        SerializerFeature.WriteNullListAsEmpty);
           ...................

    }

这时再转为json，aids字段存在且为[]

更多属性瞅这儿：
https://blog.csdn.net/liu_shi_jun/article/details/90453907#_5