先後端json數據發送和接收

先後端json數據發送和接收

因爲筆者後臺使用的是flask框架接收和前端使用的是原生的JavaScript和jQuery的ajax發送，能力有限，在此僅寫下我開發項目過程當中所得，歡迎指正交流。

1、flask中的json數據接收

一、利用flask的request.form.get()方法

Python後臺部分代碼

from flask import Flask
from flask import jsonify
from flask import request
import json
...

# 登陸
@app.route("/flask/login", methods=['POST'])
def login():
    data_ = request.form.get('data')
    data = json.loads(data)
    username = data['username']
    password = data['password']
    rem = False
    if data['remember']:
        rem = True
    return jsonify({"login": Login.login(username, password, rem)})  # 返回布爾值

二、 利用flask的request.get_data()方法

Python後臺代碼

from flask import Flask
from flask import jsonify
from flask import request
import json
...

# 登陸
@app.route("/flask/login", methods=['POST'])
def login():
    data = request.get_data()
    data = json.loads(data)
    username = data['username']
    password = data['password']
    rem = False
    if data['remember']:
        rem = True
    return jsonify({"login": Login.login(username, password, rem)})  # 返回布爾值

三、利用flask的request.get_json()方法

Python後臺代碼

from flask import Flask
from flask import jsonify
from flask import request

...

# 登陸
@app.route("/flask/login", methods=['POST'])
def login():
    data = request.get_json()
    username = data['username']
    password = data['password']
    rem = False
    if data['remember']:
        rem = True
    return jsonify({"login": Login.login(username, password, rem)})  # 返回布爾值

2、前端發送json數據

一、原生XMLHttp發送

function login() {
    var username =document.getElementById("username").value;
    var password = document.getElementById("password").value;
    var remember =document.getElementById("remember").checked;
    var xmlhttp;
    if (window.XMLHttpRequest)
    {
        //  IE7+, Firefox, Chrome, Opera, Safari 瀏覽器執行代碼
        xmlhttp=new XMLHttpRequest();
    }
    else
    {
        // IE6, IE5 瀏覽器執行代碼
        xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
    }
    xmlhttp.onreadystatechange=function()
    {
        if (xmlhttp.readyState===4 && xmlhttp.status===200)
        {
           ...
        }
    };

    xmlhttp.open("POST","/flask/login",true);
    xmlhttp.setRequestHeader("Content-type","application/json");
    // 後面這兩部很重要，我看網上不少都是使用xmlhttp.send("username="+username+"&password="+"),這樣接收還要解析一番感受仍是直接發送如下格式的好些
    var data = {
        "username": username
        "password": password
        "remember": remember
    };
    var data_json = JSON.stringify(data);
    xmlhttp.send(data_json);
}

附：json數據解析

var text = xmlhttp.responseText;
   //  經過eval() 方法將json格式的字符串轉化爲js對象，並進行解析獲取內容
   var result = eval("("+text+")");
   if (result) {
                
     } else {
                alert("請輸入正確的用戶名和密碼");
            }

二、ajax發送

$(document).ready(function () {
    var data = {
    "username": "adamin",
    "password": "123456789",
    "remember": true
    }
    $.ajax({
        url: "/flask/login",
        type: "POST",
        data: data,
        success: function () {
            
        }
    })
    })