webMagic简单的例子

WebMagic基于Maven进行构建，推荐使用Maven来安装WebMagic。在你自己的项目（已有项目或者新建一个）中添加以下坐标即可：

<dependency> ???<groupId>us.codecraft</groupId> ???<artifactId>webmagic-core</artifactId> ???<version>0.7.3</version></dependency><dependency> ???<groupId>us.codecraft</groupId> ???<artifactId>webmagic-extension</artifactId> ???<version>0.7.3</version></dependency>

WebMagic使用slf4j-log4j12作为slf4j的实现.如果你自己定制了slf4j的实现，请在项目中去掉此依赖。

以下代码是去除依赖

<dependency> ???<groupId>us.codecraft</groupId> ???<artifactId>webmagic-extension</artifactId> ???<version>0.7.3</version> ???<exclusions> ???????<exclusion> ???????????<groupId>org.slf4j</groupId> ???????????<artifactId>slf4j-log4j12</artifactId> ???????</exclusion> ???</exclusions></dependency>

例子: 测试可用的

import us.codecraft.webmagic.Page;
import us.codecraft.webmagic.Site;
import us.codecraft.webmagic.Spider;
import us.codecraft.webmagic.processor.PageProcessor;

public class MyProcessor implements PageProcessor {

 ???// 抓取网站的相关配置，包括编码、抓取间隔、重试次数等
 ???private Site site = Site.me().setRetryTimes(3).setSleepTime(100);
 ???private static int count =0;

 ???@Override
 ???public Site getSite() {
 ???????return site;
 ???}

 ???@Override
 ???public void process(Page page) {
 ???????//判断链接是否符合http://www.cnblogs.com/任意个数字字母-/p/7个数字.html格式
 ???????if(!page.getUrl().regex("http://www.cnblogs.com/[a-z 0-9 -]+/p/[0-9]{7}.html").match()){
 ???????????//加入满足条件的链接
 ???????????page.addTargetRequests(
 ???????????????????page.getHtml().xpath("//*[@id=\"post_list\"]/div/div[@class=‘post_item_body‘]/h3/a/@href").all());
 ???????????//获取页面需要的内容
 ???????????System.out.println("抓取的内容："+
 ???????????????????page.getHtml().xpath("//*[@id=\"Header1_HeaderTitle\"]/text()").get()
 ???????????);
 ???????????count ++;
 ???????}
 ???}

 ???public static void main(String[] args) {
 ???????long startTime, endTime;
 ???????System.out.println("开始爬取...");
 ???????startTime = System.currentTimeMillis();
 ???????Spider.create(new MyProcessor()).addUrl("https://www.cnblogs.com/").thread(5).run();
 ???????endTime = System.currentTimeMillis();
 ???????System.out.println("爬取结束，耗时约" + ((endTime - startTime) / 1000) + "秒，抓取了"+count+"条记录");
 ???}


}

webMagic简单的例子

原文地址：https://www.cnblogs.com/junlei0829/p/9409148.html