过滤掉为 null 的 json

python 里面过滤

def del_none(d):
    """
    Delete keys with the value ``None`` in a dictionary, recursively.

    This alters the input so you may wish to ``copy`` the dict first.
    """
    # d.iteritems isn't used as you can't del or the iterator breaks.
    for key, value in d.items():
        if value is None:
            del d[key]
        elif isinstance(value, dict):
            del_none(value)
    return d  # For convenience

...............

result_dic = {
    'meta': {
        'metaCode': 'Success',
        'cost': cost,
        'timestamp': end,
        'postname': 'python'

  },
    'data': {
        'image': image,
        'title': title
    }
}
json.dumps(del_none(result_dic))
​

golang 里面过滤掉为 null 的字段

定义 omitempty 即可

type imageInfo struct {
	Width           int    `json:"width,omitempty"`
	Height          int    `json:"height,omitempty"`
	Author          int    `json:"author,omitempty"`
	Size            int64  `json:"size,omitempty"`
	Format          string `json:"format,omitempty"`
	Ua              string `json:"ua,omitempty"`
	DecoderPlatform string `json:"DecoderPlatform,omitempty"`
}

​

java 过滤掉不用 null 字段

略