从 python flask api 中的不可变字典中提取相关键

Question

put req screenshot您好我目前正在尝试在python中解析以下post请求

-------------------------------28947758029299
Content-Disposition: form-data; name="eventData"; filename="eventData.txt"
Content-Type: application/json; charset=utf-8


    {
        "Rule" : "sendSpots",
        "Alert" : [
            {
                "Event" : {
                    "Version" : "1",
                    "EventUUID" : "fe1817b9-8557-4784-b64a-617c50fe27b8",
                    "Type"      : "Vision",
                    "Subtype"   : "Alarm",
                    "SensorUUID" : "!id:9298e8e1-feb0-48e3-9c44-11ee42672ac9!",
                    "Origin"     : "DVS-BOX-PC",
                    "InstanceType" : "ParkingSpaceAnalyzer",
                    "InstanceName" : "ParkingSpotAnalyser",
                    "SubName"      : "P01",
                    "FrameTime"    : "2018-04-19T09:59:41.0970000Z",
                    "Parameters"   : [
                        {
                            "Name" : "DURATION",
                            "Type" : "int",
                            "Value" : "3669869"
                        },
                        {
                            "Name" : "STREAM_RESOLUTION",
                            "Type" : "string",
                            "Value" : "1280,720"
                        },
                        {
                            "Name" : "GENERIC_XML",
                            "Type" : "string",
                            "Value" : "<EventData><ParkingState type=\"string\">occupied</ParkingState><ParkingDurationExceeded type=\"int\">1</ParkingDurationExceeded></EventData>"
                        },
                        {
                            "Name" : "REGION",
                            "Type" : "string",
                            "Value" : "638,613 694,377 792,373 695,614"
                        }
                    ]
                }
            }
        ]
    }

-------------------------------28947758029299--

我希望将 Event 提取为字典，以便我可以访问版本值、子名称值和 SensorUUId。为了尝试提取此信息，我使用了代码

data = request.form
body = data['-------------------------------28947758029299\nContent-Disposition: form-data; name']

但是，这会以 unicode 类型返回以下内容：

"eventData"; filename="eventData.txt"
Content-Type: application/json; charset=utf-8


{
    "Rule" : "sendSpots",
    "Alert" : [
        {
            "Event" : {
                "Version" : "1",
                "EventUUID" : "fe1817b9-8557-4784-b64a-617c50fe27b8",
                "Type"      : "Vision",
                "Subtype"   : "Alarm",
                "SensorUUID" : "!id:9298e8e1-feb0-48e3-9c44-11ee42672ac9!",
                "Origin"     : "DVS-BOX-PC",
                "InstanceType" : "ParkingSpaceAnalyzer",
                "InstanceName" : "ParkingSpotAnalyser",
                "SubName"      : "P01",
                "FrameTime"    : "2018-04-19T09:59:41.0970000Z",
                "Parameters"   : [
                    {
                        "Name" : "DURATION",
                        "Type" : "int",
                        "Value" : "3669869"
                    },
                    {
                        "Name" : "STREAM_RESOLUTION",
                        "Type" : "string",
                        "Value" : "1280,720"
                    },
                    {
                        "Name" : "GENERIC_XML",
                        "Type" : "string",
                        "Value" : "<EventData><ParkingState type=\"string\">occupied</ParkingState><ParkingDurationExceeded type=\"int\">1</ParkingDurationExceeded></EventData>"
                    },
                    {
                        "Name" : "REGION",
                        "Type" : "string",
                        "Value" : "638,613 694,377 792,373 695,614"
                    }
                ]
            }
        }
    ]
}
-------------------------------28947758029299--

我不知道该怎么走，干杯。

Answer 1

您需要将您发布的 json 数据转换为字典：

json_dict = request.get_json()

然后您需要对其进行解析以获得正确的信息：

UUID = json_dict['Alert'][0]['Event']['SensorUUID']

编辑： 最小的工作示例：

卷曲

curl -X POST -H "Content-Type: application/json" -d '{
    "Rule" : "sendSpots",
    "Alert" : [
        {
            "Event" : {
                "Version" : "1",
                "EventUUID" : "fe1817b9-8557-4784-b64a-617c50fe27b8",
                "Type"      : "Vision",
                "Subtype"   : "Alarm",
                "SensorUUID" : "!id:9298e8e1-feb0-48e3-9c44-11ee42672ac9!",
                "Origin"     : "DVS-BOX-PC",
                "InstanceType" : "ParkingSpaceAnalyzer",
                "InstanceName" : "ParkingSpotAnalyser",
                "SubName"      : "P01",
                "FrameTime"    : "2018-04-19T09:59:41.0970000Z",
                "Parameters"   : [
                    {
                        "Name" : "DURATION",
                        "Type" : "int",
                        "Value" : "3669869"
                    },
                    {
                        "Name" : "STREAM_RESOLUTION",
                        "Type" : "string",
                        "Value" : "1280,720"
                    },
                    {
                        "Name" : "GENERIC_XML",
                        "Type" : "string",
                        "Value" : "<EventData><ParkingState type=\"string\">occupied</ParkingState><ParkingDurationExceeded type=\"int\">1</ParkingDurationExceeded></EventData>"
                    }' http://127.0.0.1:5000/ 

Python：

from flask import Flask, render_template,request, render_template_string
app = Flask(__name__)

@app.route("/", methods=['GET', 'POST'])
def homepage_process():
    if request.method == 'POST':
        json_dict = request.get_json()
        return json_dict['Alert'][0]['Event']['SensorUUID']

回复：

!id:9298e8e1-feb0-48e3-9c44-11ee42672ac9!

Answer 2

我使用以下代码解决了这个问题。通过使请求正文成为字符串并对其进行解析。感谢您的帮助。

data = request.stream.read()
first_s = data.find('{')
last_s = data.rfind('}')
data = data[first_s:last_s+1]
data = json.loads(data)
data = dict(data)