python scrapy baidu image【转】

原 https://github.com/vivianLL/baidupictures

#!/usr/bin/env Python
# coding=utf-8
#__author__ = 'leilu'


import json
import itertools
import urllib
import requests
import os
import re
import codecs
import sys
import imghdr

reload(sys)
sys.setdefaultencoding("utf-8")

str_table = {
    '_z2C$q': ':',
    '_z&e3B': '.',
    'AzdH3F': '/'
}

char_table = {
    'w': 'a',
    'k': 'b',
    'v': 'c',
    '1': 'd',
    'j': 'e',
    'u': 'f',
    '2': 'g',
    'i': 'h',
    't': 'i',
    '3': 'j',
    'h': 'k',
    's': 'l',
    '4': 'm',
    'g': 'n',
    '5': 'o',
    'r': 'p',
    'q': 'q',
    '6': 'r',
    'f': 's',
    'p': 't',
    '7': 'u',
    'e': 'v',
    'o': 'w',
    '8': '1',
    'd': '2',
    'n': '3',
    '9': '4',
    'c': '5',
    'm': '6',
    '0': '7',
    'b': '8',
    'l': '9',
    'a': '0'
}

# str 的translate方法需要用单个字符的十进制unicode编码作为key
# value 中的数字会被当成十进制unicode编码转换成字符
# 也可以直接用字符串作为value
char_table = {ord(key): ord(value) for key, value in char_table.items()}

# 解码图片URL
def decode(url):
    # 先替换字符串
    for key, value in str_table.items():
        url = url.replace(key, value)
    # 再替换剩下的字符
    return url.translate(char_table)

# 生成网址列表
def buildUrls(word):
    word = urllib.quote(word)
    url = r"http://image.baidu.com/search/acjson?tn=resultjson_com&ipn=rj&ct=201326592&fp=result&queryWord={word}&cl=2&lm=-1&ie=utf-8&oe=utf-8&st=-1&ic=0&word={word}&face=0&istype=2nc=1&pn={pn}&rn=60"
    urls = (url.format(word=word, pn=x) for x in itertools.count(start=0, step=60))
    return urls

# 解析JSON获取图片URL
re_url = re.compile(r'"objURL":"(.*?)"')
def resolveImgUrl(html):
    imgUrls = [decode(x) for x in re_url.findall(html)]
    return imgUrls

def downImg(imgUrl, dirpath, imgName):
    tempfile = os.path.join(dirpath, imgName)
    try:
        res = requests.get(imgUrl, timeout=15)
        if str(res.status_code)[0] == "4":
            print(str(res.status_code), ":" , imgUrl)
            return False
    except Exception as e:
        print("抛出异常：", imgUrl)
        print(e)
        return False
    with open(tempfile, "wb") as f:
        f.write(res.content)
        if os.path.getsize(tempfile) < 1024*10:
            print("small file")
            return False
        if imghdr.what(tempfile) == 'png':
            filename = os.path.join(dirpath, imgName+'.png')
        elif imghdr.what(tempfile) =='jpeg':
            filename = os.path.join(dirpath, imgName+'.jpg')
        elif imghdr.what(tempfile) =='jpg':
            filename = os.path.join(dirpath, imgName+'.jpg')
        elif imghdr.what(tempfile) =='bmp':
            filename = os.path.join(dirpath, imgName+'.bmp')
        else:
            print(imghdr.what(tempfile))
            return False
        os.remove(tempfile)
    with open(filename, "wb") as f:
        f.write(res.content)
    return True

def mkdir(path):
    path = path.strip()
    dirpath = os.path.join("/home/aimhabo/getBaiduiImage/images/",path)
    if not os.path.exists(dirpath):
        print ("新建文件夹")        
        os.makedirs(dirpath)
        print (dirpath)
    return dirpath

if __name__ == '__main__':
    #f = open('/home/aimhabo/getBaiduiImage/images.txt', 'r')
    #for line in f:
    #    word = line.strip().decode('utf-8')
        word = 'cats猫'
        print("正在搜索：", word)
        dirpath = mkdir(word)

        word = str(word)
        urls = buildUrls(word)
        index = 1000
        index_max = 1050
        for url in urls:
            print("正在请求：", url)
            html = requests.get(url, timeout=10).content.decode('utf-8')
            imgUrls = resolveImgUrl(html)
            if len(imgUrls) == 0:  # 没有图片则结束
                break
            for url in imgUrls:
                if downImg(url, dirpath, str(index)):
                    index += 1
                    print("index now on %s" % index)
                if index > index_max:
                    break
            if index > index_max:
                break

    #f.close()