Flask处理前端POST过来的JSON数据

POST JSON数据的JS代码：

$.ajax({
  　　  url:'http://127.0.0.1:5000/calc',
  　　  type : 'post',
  　　  dataType:'json',
        headers: {
            "Content-Type": "application/json;charset=utf-8"
        },
        contentType:'application/json; charset=utf-8',
        data:JSON.stringify({D:D,q:q,ls:ls,Lz:Lz,l:l,Uz:Uz,u:u,y:y,P:P,h1:h1,data_list:data_lists}),
  　　  success:function(data){
          $("#finally").show();
      }
})

对于前端POST请求发送过来的json数据，Flask后台可使用 request.get_data() 来接收数据，数据的格式为 bytes；加上as_text=True 参数后就变成 Unicode 了；再使用 json.loads() 方法就可以转换字典。

示例代码：

from flask import Flask, render_template, request, make_response
import json
import light_calc
 
app = Flask(__name__)
app.debug = True
 
 
@app.route('/', methods=['POST', 'GET'])
def main():
    return render_template('test_inputs.html')
 
 
@app.route('/calc', methods=['POST'])
def calc():
    data_list = []
    data = json.loads(request.get_data(as_text=True))   # request.get_data(as_text=True) ： 获取前端POST请求传过来的 json 数据
    for key, value in data.items():
        if value == '':
            data[key] = 0
    for key, value in data.items():
        if type(value) == str and value != 'i':
            data[key] = float(value)
 
    for i in data['data_list']:
        new_dict = {}
        new_dict['r'] = float(i['r'])
        new_dict['d'] = float(i['d'])
        new_dict['n'] = float(i['n'])
        new_dict['n_2'] = float(i['n_2'])
        data_list.append(new_dict)
    print(data)
    print(data_list)
    try:
        result = light_calc.main(data['D'], data['q'], data['ls'], data['Lz'], data['Uz'], data['l'], data['u'], data['y'],
                             data['P'], data['h1'], data_list)
        resp = make_response(result)
        resp.headers['Content-Type'] = 'text/json'
        return result
    except Exception as e:
        print(e)
        return '{"status":"500"}'
 
if __name__ == '__main__':
    app.run()