一个用Java实现的豆瓣读书的爬虫
1.使用JDK的java.net包中提供的访问HTTP协议的基本功能的类:HttpURLConnection来抓取网页内容。采用User Agent伪装为浏览器进行爬取。
2.使用jsoup解析html获取书籍信息。
3.使用堆排序算法得到评分前40的书籍。构造n个数据元素的最大堆,时间复杂度为O(nlog2n)。取出堆顶元素,即为当前堆的最大数,时间复杂度为O(log2n)。
4.使用多线程爬取
综合5次程序运行,运行时长约为4.40s
Crawler
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