import requests

import re

from urllib import parse

import os

from threading import Thread

def download(i,j,key,url):

    header = {'content-type': 'application/json',

             "User-Agent":"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36",

              "Connection":"keep-alive",

              "Accept":"text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8",

              "Accept-Language":"zh-CN,zh;q=0.8"

              }

    response = requests.get(url,headers=header)

    link = re.findall(r'"objURL":"(.*?)"',response.text,re.S)

    if not os.path.exists(key):

        os.mkdir("./"+key+"/")

    for web in link:

        url = decodeurl(web)

        print(url)

        try:

            #allow_redirects=False 关闭重定向

            pic = requests.get(url,timeout=10,headers=header,allow_redirects=False)

            dirfile = "./"+key+"/" +key + '_' + str(j) + '.jpg'

            fp = open(dirfile, 'wb')

            fp.write(pic.content)

            fp.close()

            j += 1

        except requests.exceptions.ConnectionError:

            print(web,"【错误】当前图片无法下载")

            continue

        except requests.exceptions.ReadTimeout:

            print(web, "【错误】超时")

            continue

        except requests.exceptions.ChunkedEncodingError:

            print(web, "【错误】远程主机强迫关闭了一个现有的连接")

            continue

def decodeurl(url):

    str_table = {

    '_z2C$q': ':',

    '_z&e3B': '.',

    'AzdH3F': '/'

    }

    char_table = {

        'w': 'a',

        'k': 'b',

        'v': 'c',

        '': 'd',

        'j': 'e',

        'u': 'f',

        '': 'g',

        'i': 'h',

        't': 'i',

        '': 'j',

        'h': 'k',

        's': 'l',

        '': 'm',

        'g': 'n',

        '': 'o',

        'r': 'p',

        'q': 'q',

        '': 'r',

        'f': 's',

        'p': 't',

        '': 'u',

        'e': 'v',

        'o': 'w',

        '': '',

        'd': '',

        'n': '',

        '': '',

        'c': '',

        'm': '',

        '': '',

        'b': '',

        'l': '',

        'a': ''

    }

    char_table = {ord(key): ord(value) for key, value in char_table.items()}

    for key,value in str_table.items():

        url = url.replace(key,value)

    url = url.translate(char_table)

    return url

def main():

    j = 0

    key = "树叶标本"

    data = parse.quote(str(key))

    for i in range(j,2000,30):

        if j == 0:

            j +=1

        url = "http://image.baidu.com/search/acjson?tn=resultjson_com&ipn=rj&ct=201326592&is=&fp=result&queryWord+=&cl=2&lm=-1&ie=utf-8&oe=utf-8&adpicid=&st=&word="+data+"&z=&ic=&s=&se=&tab=&width=&height=&face=&istype=&qc=&nc=1&fr=&step_word="+data+"&pn="+str(i)+"&rn=30&gsm=3c&1527055161957="

        download(i,j,key,url)

        j += 30

if __name__ == "__main__":

    main()