最近在看关于爬虫的东西，所以写了点练练手
目前还没竣工，只是到了能返回JSON数据的阶段
参考文献是：http://cuiqingcai.com/1001.html  作者写了一系列的爬虫教程，很实用！
用宜送转运的登录练练手吧，反正最近入了深圳海关坑，哎，。说多了都是泪
主要注意：

1. 宜送登陆：HTTP头信息，Content-Type: application/x-www-form-urlencoded，不然直接提示登录失败。可能因为登录的人不多，目前没有设置验证码
2. 获取账户订单信息：页面加载后，是AJAX向服务器二次请求JSON格式的订单信息的，而且发送的请求也是JSON格式来POST的。返回值也是JSON，直接免去了正则匹配啊！

# -*- coding: UTF-8 -*-
__author__ = 'Bowei'
import urllib
import urllib2
import cookielib
import json
class YiCrawler:
    statusCode = {
        'AIRARRDEST': '已到达',
        'DONE': '已完成',
        'CLEAR': '清关中',
        'CONFIRM': '已确认'
    }
    def __init__(self):
        self.userinfo = {'j_username': '',
                         'j_password': ''}
        self.cookie = cookielib.CookieJar()
        self.headers = {'Content-Type': 'application/x-www-form-urlencoded',
                        'Cache-Control': 'no-cache'}
        self.cookie_handler = urllib2.HTTPCookieProcessor(self.cookie)
        self.opener = urllib2.build_opener(self.cookie_handler)
        self.results = []   # 存放查询结果，队列中的元素是字典
    def get_status_str(self, status):
        if self.statusCode.has_key(status):
            return self.statusCode[status]
        else:
            return status
    def set_user_info(self, username, password):
        self.userinfo['j_username'] = username
        self.userinfo['j_password'] = password
    def login(self):
        print 'Login start'
        login_data = urllib.urlencode(self.userinfo)
        url = 'https://www.yi-express.com/login/send'
        request = urllib2.Request(url, login_data, self.headers)
        try:
            response = self.opener.open(request)
            print 'Finished login'
            return response.getcode()
        except urllib2.HTTPError, e:
            print e.code
            return e.code
    def get_page(self, pageNo=1, orderType="", warehouse=""):
        url = 'https://www.yi-express.com/customer/orderSearch'
        order_params = {"pageNo": str(pageNo), "orderNoOrName": "",
                        "warehouse": warehouse, "orderType": orderType,
                        "orderCreateStart": "", "orderCreateEnd": ""}
        request = urllib2.Request(url)
        request.add_header('Content-Type', 'application/json')
        try:
            response = self.opener.open(request, json.dumps(order_params))
            response_decoded = json.loads(response.read())
            for key, value in response_decoded.iteritems():
                # print str(key) + ': ' + str(value)
                if str(key) == 'result':
                    self.results.extend(value)
            return response_decoded['hasNext']
        except urllib2.HTTPError, e:
            print e.code
            return False
    def fetch_all(self):
        # 获取所有页面的数据
        self.results = []
        hasNext = True
        pageCount = 1
        while hasNext:
            hasNext = self.get_page(pageCount)
            pageCount += 1
    def print_results(self):
        print '========= START ==========='
        for item in self.results:
            print 'ID:\t' + item['id']
            print 'TIME:\t' + item['inDateWithFormat']
            print 'PRICE:\t' + str(item['realCost'])
            print 'WEIGHT:\t' + str(item['realWeight'])
            print 'EXP_NAME:\t' + item['expressName']
            print 'STATUS:\t' + self.get_status_str(item['statusCode'])
            print '\n'
if __name__ == '__main__':
    crawler = YiCrawler()
    print crawler.login()
    #crawler.get_page(pageNo=1)
    crawler.fetch_all()
    crawler.print_results()