Getting real reptile reptilian 3 ---

Getting reptile 1 --- talk about web crawler

2 --- Getting reptile reptiles framework webmagic

Getting real reptile reptilian 3 ---

3  reptile combat

      3.1 Requirements

        A time period from the day **** crawling documentation blog, the article is stored in the database.

      Digital-ready 3.2

        The following are **** each channel address:

        Here first prepare two tables:

        Channel Table:

        

       Article table: 

        

        Tb_channel add records to the table:

         

      3.3  coding

             Write module 3.3.1

        ( 1 ) create springboot IDEA project (not explained in detail here), create modules article_crawler , introduction of dependence

  <dependencies>
        <dependency>
            <groupId>us.codecraft</groupId>
            <artifactId>webmagic-core</artifactId>
            <version>0.7.3</version>
            <exclusions>
                <exclusion>
                    <groupId>org.slf4j</groupId>
                    <artifactId>slf4j-log4j12</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>us.codecraft</groupId>
            <artifactId>webmagic-extension</artifactId>
            <version>0.7.3</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>
 </dependencies>

        ( 2 ) create a profile application.yml 

server:
  port: 9015
spring:
  application:
    name: article-crawler #指定服务名
  datasource:
    driverClassName: com.mysql.jdbc.Driver
    url: jdbc:mysql://****:3306/test_article?characterEncoding=UTF8
    username: ****
    password: ****
  jpa:
    database: MySQL
    show-sql: true
  redis:
    host: ****
    password: ****

        (3) create a startup class

@SpringBootApplication
@EnableScheduling
public class ArticleCrawlerApplication {

    public static void main(String[] args) {

        SpringApplication.run(ArticleCrawlerApplication.class);
    }

    @Value("${spring.redis.host}")
    private String redis_host;

    @Value("${spring.redis.password}")
    private String redis_password;

    @Bean
    public IdWorker idWorker(){
        return  new IdWorker(1,1);
    }

    @Bean
    public RedisScheduler redisScheduler(){
        JedisPoolConfig config = new JedisPoolConfig();// 连接池的配置对象
        config.setMaxTotal(100);// 设置最大连接数
        config.setMaxIdle(10);// 设置最大空闲连接数
        JedisPool jedisPool=new JedisPool(config,redis_host,6379,20000,redis_password);
        return new RedisScheduler(jedisPool);
    }

        (4) the entity classes and data access interface (not explain here)

             3.3.2 Class crawling   

        Creating article crawling class ArticleProcessor

/**
 * 文章爬取类
 */
@Component
public class ArticleProcessor implements PageProcessor {
    @Override
    public void process(Page page) {
        page.addTargetRequests(  page.getHtml().links().regex("https://blog.csdn.net/[a-z 0-9 -]+/article/details/[0-9]{8}").all());
        //文章标题
        String title=page.getHtml().xpath("//*[@id=\"mainBox\"]/main/div[1]/div/div/div[1]/h1").get();
        String content=page.getHtml().xpath("//*[@id=\"article_content\"]/div[2]").get();
        if(title!=null && content!=null){
            page.putField("title" ,title );
            page.putField("content",content);
        }else{
            page.setSkip(true);//跳过
        }

    }

    @Override
    public Site getSite() {
        return Site.me().setRetryTimes(3000).setSleepTime(100);
    }
}

             3.3.3 storage class 

        Create an article storage class ArticleDbPipeline , is responsible for crawling the data stored in the database

@Component
public class ArticleDbPipeline implements Pipeline {

    @Autowired
    private ArticleDao articleDao;

    @Autowired
    private IdWorker idWorker;


    private String channelId;//频道ID

    public void setChannelId(String channelId) {
        this.channelId = channelId;
    }

    @Override
    public void process(ResultItems resultItems, Task task) {
        String title=resultItems.get("title");//取出标题
        String content=resultItems.get("content");//内容
        Article article=new Article();
        article.setId(idWorker.nextId()+"");
        article.setChannelid(channelId);
        article.setTitle(title);
        article.setContent(content);
        articleDao.save(article);
    }
}

             3.3.4 Task class

        Create a task class, according @Scheduled set the timing crawl

/**
 * 任务类
 */
@Component
public class ArticleTask {

    @Autowired
    private ArticleProcessor articleProcessor;

    @Autowired
    private ArticleDbPipeline articleDbPipeline;

    @Autowired
    private RedisScheduler redisScheduler;

    /**
     * 爬取AI文章
     */
    @Scheduled(cron = "0 15 15 * * ?")
    public void aiTask(){
        System.out.println("开始爬取CSDN文章");
        Spider spider =Spider.create(articleProcessor);
        spider.addUrl("https://blog.csdn.net/nav/ai");
        articleDbPipeline.setChannelId("ai");
        spider.addPipeline(articleDbPipeline);
        spider.setScheduler(redisScheduler);
        spider.start();
    }
}

         Run springboot project, query the database data, you can see the database data storage.

         Of course, the above is just a simple entry of reptiles engineering, the production of the above is applied to the real need to set up a proxy ip, more complex verification about the operation codes, not to explain here, are interested in children's shoes, you can study at their own.