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社会化海量数据采集爬虫框架搭建 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...容。
2、复制页面内容的标题、作者、内容。
3、存储到文本文件或者excel。
从技术角度来说整个过程主要为 网络访问、扣取结构化数据、存储。我们看一下用java程序如何来实现这一过程。
import java.io.IOException;
import org.apac...
What does it mean for a data structure to be “intrusive”?
...to know about the list it is in, and inform it of changes.
ORM-systems usually revolve around intrusive data structures, to minimize iteration over large lists of objects. For instance, if you retrieve a list of all the employees in the database, then change the name of one of them, and want to sav...
Is it possible to make the -init method private in Objective-C?
...
Objective-C, like Smalltalk, has no concept of "private" versus "public" methods. Any message can be sent to any object at any time.
What you can do is throw an NSInternalInconsistencyException if your -init method is invoked:
- (id)init {
...
“R cannot be resolved to a variable”? [duplicate]
...nd, huh? :) If you can't get R.java to build in the first place, it's usually a typo or other problem in an XML layout file. Using a capital letter in your XML filenames will also cause that problem. If R.java does exist but variables in it aren't recognized by just one Java file, for instance, ...
Google Guava vs. Apache Commons [closed]
...n (which is a major drawback for a collections API in my opinion) and generally seems to be in a maintenance/don't-do-too-much-work-on-it mode Recently Commons Collections has picked up some steam again, but it has some catching up to do..
If download size/memory footprint/code size is an issue the...
How to read keyboard-input?
... mixing different Pythons here (Python 2.x vs. Python 3.x)...
This is basically correct:
nb = input('Choose a number: ')
The problem is that it is only supported in Python 3. As @sharpner answered, for older versions of Python (2.x), you have to use the function raw_input:
nb = raw_input('Choose...
Argparse: Way to include default values in '--help'?
...
@mqsoh multiple inheritance actually just worked, but unfortunately is not public API: stackoverflow.com/a/52025430/895245
– Ciro Santilli 郝海东冠状病六四事件法轮功
Aug 26 '18 at 10:41
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TCP 的那些事儿（下） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...，突然变慢了，产生了比较大的延时，这个延时导致要重转所有的包（因为之前的RTO很小），于是，因为重转的不算，所以，RTO就不会被更新，这是一个灾难。 于是Karn算法用了一个取巧的方式——只要一发生重传，就对现有的R...
How do popular apps authenticate user requests from their mobile app to their server?
...I imagine they use a "token" based security system, so the password is actually never stored anywhere, just used the first time to authenticate. So the app initially posts the username/password (over ssl) and the server returns a token that the app stores. For subsequent sync attempts the token is s...
Is there a WebSocket client implemented for Python? [closed]
...good to explain what the code is doing if you are going to introduce a new API.
– user650261
Nov 19 '15 at 0:26
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