What are the general parts of the crawler program

This article mainly explains "which parts of the crawler program are generally divided into". Interested friends might as well take a look at it. The method introduced in this paper is simple, fast and practical. Next, let the editor take you to learn which parts of the crawler program are generally divided into.

1. Collection module: generally speaking, the target server will provide a variety of interfaces, including web addresses, applications or data applications.

Developers need to test according to the difficulty of collecting data, the requirement of daily data volume and the frequency of anti-crawling limit of the target server, and choose the appropriate collection interface and method.

2. Data analysis module.

Due to various uncertainties in network collection, the data analysis part carries out exception handling and location restart function when necessary, so as to avoid abnormal exit of the program or omission or repetition of data collection.

3. Anti-climbing strategy module.

Analyze the crawler strategy of the target server, control the crawler request frequency, and even crack the CAPTCHA and encrypt data, while using high-quality agents or crawler agents to ensure that the target server can not carry out anti-crawling restrictions and early warning.

Through the above optimization strategies, it basically ensures that the crawler can run stably for a long time.

The crawler program is generally divided into three parts: data acquisition module, data analysis module and anti-crawler strategy module. If you want the crawler to run efficiently and steadily, you need to prescribe the right medicine from these three aspects.

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