關於自定義類的序列化與反序列化，有一篇部落格介紹的方法比較通用：

https://www.cnblogs.com/magic8sky/p/10475704.html

但是這個方法在Python2.7中好像有問題（同時沒有驗證Python3中是否OK），在這裡介紹一種方法，但是並不是非常好，需要針對每個自定義類編寫特定的序列化、反序列化類。

下面的程式碼用於將一個List物件（元素是FolderInfo物件）進行序列化與反序列化。

FolderInfo.py

import json


class FolderInfo:
    root = ""
    fileList = []

    def __init__
 
(self):
        pass

    def toJson(self):
        overdict = self.__dict__
        # result = json.dumps(overdict, ensure_ascii=False)
        result = json.dumps(overdict)
        return result

FolderInfoListDecoder.py

from FolderInfo import FolderInfo
import json


class FolderInfoListDecoder(json.JSONDecoder):
    
 
def decode(self, s):
        folderInfoes = []
        folderInfoListObj = super(FolderInfoListDecoder, self).decode(s)
        for folderInfoStr in folderInfoListObj:
            folderInfo = FolderInfo()
            folderInfoObj = super(FolderInfoListDecoder, self).decode(folderInfoStr)
            
 
for k, v in folderInfoObj.iteritems():
                if k == "root":
                    folderInfo.root = v
                elif k == "fileList":
                    folderInfo.fileList = v
            folderInfoes.append(folderInfo)
        return folderInfoes

FolderInfoListEncoder.py

from FolderInfo import FolderInfo
import json


class FolderInfoListEncoder(json.JSONEncoder):
    def default(self, field):
        if isinstance(field, FolderInfo):
            return field.toJson()
        else:
            return json.JSONEncoder.default(self, field)

反序列化

folderInfoList = json.loads(folderInfoListJson, cls=FolderInfoListDecoder)

序列化

fileInfoListJson = json.dumps(folderInfoList, cls=FolderInfoListEncoder)