Ajax动态刷新-有道翻译案例（python经典编程案例）

向右看齐 2023-02-28 08:53 85阅读 0赞

#### 1. 网站分析 ####

爬取网站：[http://fanyi.youdao.com/][http_fanyi.youdao.com]

1.1 在输入框中输入需要翻译的字段,翻译动态刷新.可知此链接为Ajax.  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2N1aV95b25naHVh_size_16_color_FFFFFF_t_70]

1.2 经过一系列测试发现，其实际需操作的URL为 http://fanyi.youdao.com/translate\_o?smartresult=dict&smartresult=rule 。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2N1aV95b25naHVh_size_16_color_FFFFFF_t_70 1]  
上述篮框中的意思为：

e 为输入所翻译的内容
    ts 为七位整数的时间戳
    salt 为时间戳后加上一位,大于0小于9的数字
    bv 为User-Agent的值经过md5加密的 密文
    sign 为(“fanyideskweb” + e + salt + “Nw(nmmbP%A-r6U3EUn]Aj”)经过md5加密的 密文

#### 2. 代码如下 ####

# -*- coding: utf-8 -*-
    import time
    import random
    import hashlib
    import requests
    
    
    # 定义MD5方法
    def hex5(value):
        manipulator = hashlib.md5()
        manipulator.update(value.encode('utf-8'))
        return manipulator.hexdigest()
    
    
    # 获取表单数据
    def Mach(data_str):
        ts = round(time.time())
        salt = str(ts) + str(random.randint(0, 9))
        sign = hex5("fanyideskweb" + data_str + salt + "Nw(nmmbP%A-r6U3EUn]Aj")
        bv = hex5("5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3987.149 Safari/537.36")
    
        data = { 
            'i': data_str,
            'from': 'AUTO',
            'to': 'AUTO',
            'smartresult': 'dict',
            'client': 'fanyideskweb',
            'salt': salt,  # salt = ts + 一个随机数
            'sign': sign,
            'ts': ts,  # ts 时间戳
            'bv': bv,
            'doctype': 'json',
            'version': '2.1',
            'keyfrom': 'fanyi.web',
            'action': 'FY_BY_REALTlME',
        }
        return data
    
    
    # 构造请求方法
    def Translation(url, data):
        header = { 
            'Accept': 'application/json, text/javascript, */*; q=0.01',
            'Accept-Encoding': 'gzip, deflate, br',
            'Accept-Language': 'zh-CN,zh;q=0.9,en;q=0.8',
            'Connection': 'keep-alive',
            'Content-Length': '237',
            'Content-Type': 'application/x-www-form-urlencoded; charset=UTF-8',
            'Cookie': 'OUTFOX_SEARCH_USER_ID=1648504734@10.169.0.83; OUTFOX_SEARCH_USER_ID_NCOO=1054516127.1065001; JSESSIONID=aaaFtapMs3Ow4bIaK06-w; ___rl__test__cookies=1580462241081',
            'DNT': '1',
            'Host': 'fanyi.youdao.com',
            'Origin': 'https://fanyi.youdao.com',
            'Referer': 'https://fanyi.youdao.com/',
            'Sec-Fetch-Mode': 'cors',
            'Sec-Fetch-Site': 'same-origin',
            'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36',
            'X-Requested-With': 'XMLHttpRequest',
        }
        response = requests.post(url, headers=header, data=data)
        return response
    
    
    def main():
        url = 'http://fanyi.youdao.com/translate_o?smartresult=dict&smartresult=rule'
        input_str = input('请输需翻译的内容（不得大于5000字！）:')
        data = Mach(input_str)
        translate = Translation(url, data=data)
        # 提取json数据
        print(translate.json()['translateResult'][0][0]['tgt'])
    
    
    if __name__ == '__main__':
        main()

执行结果如下：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2N1aV95b25naHVh_size_16_color_FFFFFF_t_70 2]

[http_fanyi.youdao.com]: http://fanyi.youdao.com/
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2N1aV95b25naHVh_size_16_color_FFFFFF_t_70]: /images/20230209/9463037633484449a5cb4c1cf354bac0.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2N1aV95b25naHVh_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20200720202950154.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2N1aV95b25naHVh,size_16,color_FFFFFF,t_70
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2N1aV95b25naHVh_size_16_color_FFFFFF_t_70 2]: https://img-blog.csdnimg.cn/20200720203332584.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2N1aV95b25naHVh,size_16,color_FFFFFF,t_70