一、操作步骤
导入：import flask,json实例化：api = flask.Flask(name)定义接口访问路径及访问方式：@api.route(’/index’,methods=[‘get/post/PUT/DELETE’])定义函数，注意需与路径的名称一致，设置返回类型并支持中文：def index(): return json.dumps(ren,ensure_ascii=False)三种格式入参访问接口：
5.1 url格式入参：flask.request.args.get(‘id’)
5.2 form-data格式入参：pwd = flask.request.values.get(‘pwd’)
5.3 josn格式入参：pwd = flask.request.json.get(‘pwd’)启动服务：api.run(port=8888,debug=True,host=‘127.0.0.1’)，开启服务之后，就可以通过ip+端口+路径+入参访问接口
二、源码举例
#!/usr/bin/python3
# encoding:utf-8
import flask,json
# 实例化api，把当前这个python文件当作一个服务，__name__代表当前这个python文件
api = flask.Flask(__name__)
# 'index'是接口路径，methods不写，默认get请求
@api.route('/index',methods=['get'])
# get方式访问
def index():
ren = {'msg':'成功访问首页','msg_code':200}
#json.dumps 序列化时对中文默认使用的ascii编码.想输出中文需要指定ensure_ascii=False
return json.dumps(ren,ensure_ascii=False)
#post入参访问方式一：url格式参数
@api.route('/article',methods=['post'])
def article():
#url格式参数?id=12589&name='lishi'
id = flask.request.args.get('id')
if id:
if id == '12589':
ren = {'msg':'成功访问文章','msg_code':200}
else:
ren = {'msg':'找不到文章','msg_code':400}
else:
ren = {'msg':'请输入文章id参数','msg_code':-1}
return json.dumps(ren,ensure_ascii=False)
#post入参访问方式二：from-data（k-v）格式参数
@api.route('/login',methods=['post'])
def login():
#from-data格式参数
usrname = flask.request.values.get('usrname')
pwd = flask.request.values.get('pwd')
if usrname and pwd:
if usrname =='test' and pwd =='123456':
ren = {'msg':'登录成功','msg_code':200}
else:
ren = {'msg':'用户名或密码错误','msg_code':-1}
else:
ren = {'msg':'用户名或密码为空','msg_code':1001}
return json.dumps(ren,ensure_ascii=False)
#post入参访问方式二：josn格式参数
@api.route('/loginjosn',methods=['post'])
def loginjosn():
#from-data格式参数
usrname = flask.request.json.get('usrname')
pwd = flask.request.json.get('pwd')
if usrname and pwd:
if usrname =='test' and pwd =='123456':
ren = {'msg':'登录成功','msg_code':200}
else:
ren = {'msg':'用户名或密码错误','msg_code':-1}
else:
ren = {'msg':'用户名或密码为空','msg_code':1001}
return json.dumps(ren,ensure_ascii=False)
if __name__ == '__main__':
api.run(port=8888,debug=True,host='127.0.0.1') # 启动服务
# debug=True,改了代码后，不用重启，它会自动重启
# 'host='127.0.0.1'别IP访问地址
运行结果：
* Serving Flask app 'monitor' (lazy loading)
* Environment: production
WARNING: This is a development server. Do not use it in a production deployment.
Use a production WSGI server instead.
* Debug mode: on
* Restarting with stat
* Debugger is active!
* Debugger PIN: 991-833-116
* Running on http://127.0.0.1:8888/ (Press CTRL+C to quit)
127.0.0.1 - - [16/Jan/2022 14:05:53] "POST /login?usrname=test&pwd=123456 HTTP/1.1" 200 -
127.0.0.1 - - [16/Jan/2022 14:08:34] "GET /index HTTP/1.1" 200 -
请求方式：
使用postman测试接口是否可行
如：
url:127.0.0.1:8888/login
参数：usrname=test;pwd=123456
获取请求参数的几种方法：
flask.request.form.get("key", type=str, default=None) 获取表单数据，
flask.request.args.get("key") 获取get请求参数，
flask.request.values.get("key") 获取所有参数。