fastjson生成json时Null属性不显示

Fastjson的SerializerFeature序列化属性 --来自oschina bfleeee博客
QuoteFieldNames———-输出key时是否使用双引号,默认为true

WriteMapNullValue——–是否输出值为null的字段,默认为false

WriteNullNumberAsZero—-数值字段如果为null,输出为0,而非null

WriteNullListAsEmpty—–List字段如果为null,输出为[],而非null

WriteNullStringAsEmpty—字符类型字段如果为null,输出为”“,而非null

WriteNullBooleanAsFalse–Boolean字段如果为null,输出为false,而非null。

/* 根据名称和类型查询小班信息 */

@RequestMapping("/getSBInfo")

@ResponseBody

public Object getSBInfo(@RequestParam Map map) {
JSONObject jsonArray = null;

if (map != null) {

//县、乡、村名称

String county = (String) map.get("county");

String town = (String) map.get("town");

String village = (String) map.get("village");

//类型是县、乡、村

//"1"查询乡镇， "2"查询村， “3”查询全部

String type = (String) map.get("type");
if (county != null && town != null && village != null) {

//查全部

Map mapAll = stateCountyService.getAll(county, town, village);

String str = JSON.toJSONString(mapAll,SerializerFeature.WriteMapNullValue);

jsonArray = JSONObject.parseObject(str);
} else if (county != null && town != null) {

//查村

Map mapVillage = stateCountyService.getVillge(county, town);

String str = JSON.toJSONString(mapVillage,SerializerFeature.WriteMapNullValue);

jsonArray = JSONObject.parseObject(str);
} else if (county != null) {

//查乡镇

Map mapTown = stateCountyService.getTown(county);

String str = JSON.toJSONString(mapTown,SerializerFeature.WriteMapNullValue);

jsonArray = JSONObject.parseObject(str);
}

}

return jsonArray;

}