write cacheUtils code

1_7.http_proxy_server/python/testCode/cacheUtil.py

@@ -2,8 +2,9 @@
 # coding=utf-8
 import urllib
 import urllib2
+import json
 class CacheUtils:
-
+    @staticmethod
     def cbk(a, b, c):  
         '''''回调函数 
         @a: 已经下载的数据块 
@@ -16,15 +17,53 @@ class CacheUtils:
         print '%.2f%%' % per  
 
     def download(self, url, local):
-        urllib.urlretrieve(url, local, cbk)
+        urllib.urlretrieve(url, local, self.cbk)
 
-    def cache(self, url):
+    def cache(self, url, range):
         fileName = url.split('/')[-1]
         req = urllib2.Request(url)
-        #req.add_header('Range', 'bytes=0-7000')
+        req.add_header('Range', 'bytes=' + range)
         response = urllib2.urlopen(req)
         buffer = response.read()
-        with open("./cache/img.png", "a+") as fp:
+        with open("./cache/" + fileName + range, "a+") as fp:
             fp.write(buffer)
 
+    def saveReq(self, url):
 
+        # Reading data back
+        with open('data.json', 'r') as fp:
+            data = json.load(fp)
+        data[url] = 4000
+        # Writing JSON data
+        with open('data.json', 'w') as fp:
+            json.dump(data, fp)
+   
+    
+    def checkReq(self):
+        # Reading data back
+        with open('data.json', 'r') as fp:
+            data = json.load(fp)
+        #print(data)
+        #print(data.keys())
+        print(data["www.baidu.com"])
+        if data.get("key"): 
+            print(data["key"])
+        else:
+            print("error")
+
+"""
+if __name__ == '__main__':
+    cacheUtils = CacheUtils()
+    
+    #url = "http://www.sina.com.cn"
+    #fileName = url.split('/')[-1]
+    #cacheUtils.download(url, "./cache/" + fileName)
+    
+    #cacheUtils.cache("http://www.baidu.com")
+    #cacheUtils.cache("https://ss0.bdstatic.com/5aV1bjqh_Q23odCf/static/superplus/img/logo_white_ee663702.png", "0-7000")
+    #cacheUtils.cache("https://ss0.bdstatic.com/5aV1bjqh_Q23odCf/static/superplus/img/logo_white_ee663702.png", "7001-14175")
+
+    cacheUtils.saveReq("http://www.sina.com.cn")
+    
+    #cacheUtils.loadReq()
+"""

1_7.http_proxy_server/python/testCode/data.json

@@ -0,0 +1 @@
+{"http://www.sina.com.cn": 4000}

1_7.http_proxy_server/python/testCode/dd.json

@@ -0,0 +1 @@
+{"www.baidu.com": 1000, "http://www.sina.com.cn": 4000}