简单介绍webmagic的使用

ihchenchen2023-10-12 22:06

一、引入webmagic包

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    <dependency>
      <groupId>us.codecraft</groupId>
      <artifactId>webmagic-core</artifactId>
      <version>${webmagic.core.version}</version>
      <exclusions>
        <exclusion>
          <artifactId>slf4j-api</artifactId>
          <groupId>org.slf4j</groupId>
        </exclusion>
      </exclusions>
    </dependency>

二、启动爬虫

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        Request request = new Request();
        request.setMethod("GET");
        request.setUrl("http://***");
        request.addHeader("client_signature", content);
        Spider.create(new MPageProcessor())
                .addRequest(request)
                .addPipeline(new MPipeline(start))
                .thread(1)
                .start();

三、PageProcessor

当然还有更多html内容的分析，看其它文章

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public class MPageProcessor implements PageProcessor {
    private  Site site = Site.me().setSleepTime(3000).setTimeOut(120000);
    @Override
    public void process(Page page) {
        String text = page.getRawText();
//        System.out.println(text);
        JSONObject result = JSONUtil.parseObj(text);
        page.putField("data", result.getJSONObject("data"));
    }

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

四、Pipeline

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public class MPipeline implements Pipeline {

    private Date start;
    public MPipeline(Date start){
        this.start = start;
    }

    @Override
    public void process(ResultItems resultItems, Task task) {
        JSONObject data = resultItems.get("data");
        int total = data.getJSONObject("queryBean").getInt("total");
        System.out.println(total);
        Date end = new Date();
        System.out.println(DateUtil.format(end, "yyyy-MM-dd HH:mm:ss.SSSSSS"));
        System.out.println("总耗时："+DateUtil.formatBetween(start, end, BetweenFormatter.Level.MILLISECOND));
    }
}