情况
public static String getJsonResult(int status, String msg, Object data){
Map<String, Object> resultMap=new HashMap<String, Object>();
resultMap.put("status", status);
resultMap.put("msg", msg);
resultMap.put("data", data);
return JSONObject.toJSONString(resultMap,SerializerFeature.WriteMapNullValue);
}
public static void main(String[] args) {
System.out.println(getJsonResult(1, "success", null));
}
结果
{"msg":"success","status":1}
从输出结果可以看出,null对应的key已经被过滤掉;这明显不是我们想要的结果,这时我们就需要用到fastjson的SerializerFeature序列化属性
也就是这个方法:JSONObject.toJSONString(Object object, SerializerFeature... features) (摘自狂奔的蜗牛Even 博客)
public static String getJsonResult(int status, String msg, Object data){
Map<String, Object> resultMap=new HashMap<String, Object>();
resultMap.put("status", status);
resultMap.put("msg", msg);
resultMap.put("data", data);
return JSONObject.toJSONString(resultMap,SerializerFeature.WriteMapNullValue);
}
public static void main(String[] args) {
System.out.println(getJsonResult(1, "success", null));
}
结果
{"msg":"success","data":null,"status":1}