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免费网页数据抓取采集 python实现一个多线程网页下载器
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- #!/usr/bin/envpython
2n nvi$v2G R*~0 - # -*- coding:utf-8 -*-
^s{pm ]h}!f(a0 - import urllib, httplib
O|DO
HE!A0 - import thread 51Testing软件测试网fr!B {ZD
- import time 51Testing软件测试网1^$rb}1Ge
- from Queue import Queue, Empty, Full 51Testing软件测试网 q!K!uV6?i8L
- HEADERS = {"Content-type": "application/x-www-form-urlencoded", 51Testing软件测试网%P
zC3|;rq
- 'Accept-Language':'zh-cn',
]t \1Gy!i#g0 - 'User-Agent': 'Mozilla/4.0 (compatible; MSIE 6.0;Windows NT 5.0)', 51Testing软件测试网v @8RXbEk&a
- "Accept": "text/plain"} 51Testing软件测试网;N\4xSy'O-nb`1H
- UNEXPECTED_ERROR = -1 51Testing软件测试网,]7]S%Blv
- POST = 'POST'
x]\5yR\G0 - GET = 'GET'
4D6U i*ImAySQ"Z0 - def base_log(msg):
{FCgal _0 - print msg 51Testing软件测试网:{HX(y(u6_yr
- def base_fail_op(task, status, log):
,H,_i"\2N,y0| N0 - log('fail op. task = %s, status = %d'%(str(task), status))
"Z!A T,[@E Yc0 - def get_remote_data(tasks, results, fail_op = base_fail_op, log = base_log): 51Testing软件测试网RX;y Je j C
- while True:
5u"Hg_U+s0 - task = tasks.get()
aO:W:lZ%^0 - try: 51Testing软件测试网9f#]8p&{Z7B.b`
- tid = task['id'] 51Testing软件测试网DD/tMA4^h
- hpt = task['conn_args'] # hpt <= host:port, timeout 51Testing软件测试网s1Jgl)M
L
{
- except KeyError, e: 51Testing软件测试网5hn
k v bo
- log(str(e)) 51Testing软件测试网-T)d Gm3T
- continue
,v
liv)B/lX$Y%R3r0 - log('thread_%s doing task %d'%(thread.get_ident(), tid)) 51Testing软件测试网7@6?8e3e7_j#u"p
- #log('hpt = ' + str(hpt)) 51Testing软件测试网 ~_k
h,Z1nb6b
- conn = httplib.HTTPConnection(**hpt) 51Testing软件测试网r_}-z]'o*nf+F
-
1X0jp9[5|Ew)X0 - try:
&TG.Q1?4p,C0 - params = task['params']
|1LQ'C:Q6z4[A3o0 - except KeyError, e: 51Testing软件测试网6a dGn*^5t.znK
- params = {}
x*g5H ~7n!I0 - params = urllib.urlencode(params) 51Testing软件测试网,mZo w$m
m)hBHP
- #log('params = ' + params)
$J%I3?3{0[ bo0 -
oIi4U Y:k%\3O:q5m0 - try:
${-hw$nf.{+u0 - method = task['method'] 51Testing软件测试网W*Hq,b4~ _
- except KeyError:
J
mj#V[M
D;aJ0 - method = 'GET'
}@@6Sz9rd0 - #log('method = ' + method) 51Testing软件测试网$rKb,gj;e
-
z.NW1Jj}J0 - try:
r|:j8t"~]f!XyvA0 - url = task['url'] 51Testing软件测试网f |!R.p5Y7w2kr
- except KeyError:
IwNZJ|0 - url = '/'
+eUd%w(Ox0 - #log('url = ' + url) 51Testing软件测试网,x])e{*j-XW
-
c6jDK5VV(MF)}0 - headers = HEADERS
Qx,YJ)d6x
XUc0 - try:
c&~S/r7Hm|0 - tmp = task['headers'] 51Testing软件测试网6f];jah0dz%M~(E1\m
- except KeyError, e:
[Y!P8f` rH5o z0 - tmp = {} 51Testing软件测试网o+n C4Ma.? ~[#y
- headers.update(tmp)
%gG`r v{ n0 - #log('headers = ' + str(headers))
)`.B _F Hz9g,^"~0 - headers['Content-Length'] = len(params)
k)TEw;TK`0 - 51Testing软件测试网0lo-sI"w
- try: 51Testing软件测试网gj)}&`u
- if method == POST: 51Testing软件测试网.bGRf$j8av9Qm
|
- conn.request(method, url, params, headers)
#mv D"cd[0 - else:
jM8m7v{,Z'JsmM*r0 - conn.request(method, url + params) 51Testing软件测试网?
M:{@:x(uH)SQ
- response = conn.getresponse()
.g V9EE6A0 - except Exception, e: 51Testing软件测试网2M:E,NtWNsW%y
- log('request failed. method = %s, url = %s, params = %s headers = %s'%( 51Testing软件测试网)y4^I0}.Z^,ZRAp e
- method, url, params, headers)) 51Testing软件测试网!@
YA4Q&dhp
- log(str(e)) 51Testing软件测试网k3Z.e0th
- fail_op(task, UNEXPECTED_ERROR, log)
L@ J*z3qG"O0 - continue
,I!]#W k e
o3U0 -
4w#L}#JI0rN
Go7oO0 - if response.status != httplib.OK:
S[^4V8o%v
vc!W|0 - fail_op(task, response.status, log)
0g$np9uL0 - continue
a'F5o,W y3JUW{B0 - 51Testing软件测试网U9_G4G+EqOn
- data = response.read() 51Testing软件测试网Qmk,j1{tf
- results.put((tid, data), True) 51Testing软件测试网&} Y*F]hD*k
- 51Testing软件测试网H-g5D d'f
t;ZL
- class HttpPool(object):
!I
_7S)[.u1Ha#~!Q0 - def __init__(self, threads_count, fail_op, log): 51Testing软件测试网*OULk cRHH`^Q
- self._tasks = Queue()
P9]*LQ-f0 - self._results = Queue()
&K)y8x%AQOR#Q0 -
.k$Wh9CIp8K0P0s+lw0 - for i in xrange(threads_count): 51Testing软件测试网QAs-{7p$h.T-q
- thread.start_new_thread(get_remote_data,(self._tasks, self._results, fail_op, log))
j+dr6egO0 -
%_*Sr E:f7T8E@0 - def add_task(self, tid, host, url, params, headers = {}, method = 'GET', timeout = None):
[)]cp}0 - task = {
^Z2a+^N4m;a2\t7g0 - 'id' : tid,
G)|$rR4t @s,e0 - 'conn_args' : {'host' : host} if timeout is None else {'host' : host, 'timeout' : timeout}, 51Testing软件测试网"Hh3v'?W Ov\+iMb
- 'headers' : headers,
/@%Q$E`uI0 - 'url' : url,
c"}{7Yu#q-c0 - 'params' : params, 51Testing软件测试网
I;~)X3iH-ejC
z7`
- 'method' : method, 51Testing软件测试网["n.pibz
- } 51Testing软件测试网'DD
}']~\k+{
- try: 51Testing软件测试网"v0{j+J5o&r
ib@
- self._tasks.put_nowait(task) 51Testing软件测试网9W9r Uk&EZ.z
- except Full:
In(Z(yI*|5o0 - returnFalse 51Testing软件测试网/sR:`X:`0ju
- return True
%@l(`0o`C0W0 -
'n9Ds#v_0 - def get_results(self): 51Testing软件测试网^E(k4T]B2ss'{
- results = [] 51Testing软件测试网1A?"kZsm1re
- while True:
u"?trQ0 - try: 51Testing软件测试网1?9ptb!l#L4U
- res = self._results.get_nowait() 51Testing软件测试网t[`0[#a$tr ^
- except Empty:
0|/YVCw2Kt(GP*P{ W }0 - break
-KG p)g m/\0 - results.append(res)
-S+FDTP$BH0 - return results 51Testing软件测试网-\
gX+q b*m
- 51Testing软件测试网fyx-k
G6ML7E}3Qe.hw
- deftest_google(task_count, threads_count):
9GW*B
nX QLf-EMX0 - hp = HttpPool(threads_count, base_fail_op, base_log)
cNJ sY!aI0 - for i in xrange(task_count):
8FP\3r.Gv}X3JzN0 - if hp.add_task(i,
[e3[,s,Q:{@"P0 - 'www.google.cn',
{C(V"T$X)NX0 - '/search?', 51Testing软件测试网uAS$q2N7c(I
- {'q' : 'lai'}, 51Testing软件测试网(W"lI1s$E
- # method = 'POST'
JZ7^d+A8Ux0 - ):
V5}z\a0 - print 'add task successed.'
)m&Hu1m)_m p$X'{S
f'Z0 - 51Testing软件测试网'U\mT:w;a
- while True: 51Testing软件测试网d#z&Mc$L`I
- results = hp.get_results()
!\n8X/h8p0}?M0 - if not results: 51Testing软件测试网)v+Ed.U(q{0qN M
- time.sleep(1.0 * random.random()) 51Testing软件测试网(@+q-UpC5LiFi
- for i in results:
4\{.e:H P$c1ZM0 - print i[0], len(i[1]) 51Testing软件测试网TOF6MD'V"`"t[
- # print unicode(i[1], 'gb18030') 51Testing软件测试网u;{$g4{l|#|Y
-
7I ~5K3`+{w7i,K0 - if __name__ == '__main__':
`-N P2i
[-[n0 - import sys, random 51Testing软件测试网6im&UU)z"uX4u
- task_count, threads_count = int(sys.argv[1]), int(sys.argv[2])
4q$z$E!tm^9uW4@0 - test_google(task_count, threads_count)
有兴趣想尝试运行的
朋友,可以把它保存为 xxxx.py,然后执行 python xxxx.py 10 4,其中 10 表示向 google.cn 请求 10 次查询,4 表示由 4 条
线程来执行这些任务。
7O-W"J'Dc7LV051Testing软件测试网[@$b
A\n3}51Testing软件测试网-A[Zgb;_转自http://blog.csdn.net/lanphaday/archive/2009/04/16/4083852.aspx
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