关于java:Spring-Boot-WebMagic-实现网页爬虫写得太好了

作者：jessehua

起源：www.jianshu.com/p/cfead4b3e34e

WebMagic是一个开源的java爬虫框架。

WebMagic框架的应用并不是本文的重点，具体如何应用请参考官网文档：http://webmagic.io/docs/。

本文是对spring boot+WebMagic+MyBatis做了整合，应用WebMagic爬取数据，而后通过MyBatis长久化爬取的数据到mysql数据库。

本文提供的源代码能够作为java爬虫我的项目的脚手架。

1.增加maven依赖

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0"         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">    <modelVersion>4.0.0</modelVersion>    <groupId>hyzx</groupId>    <artifactId>qbasic-crawler</artifactId>    <version>1.0.0</version>    <parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>1.5.21.RELEASE</version>        <relativePath/> <!-- lookup parent from repository -->    </parent>    <properties>        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>        <maven.test.skip>true</maven.test.skip>        <java.version>1.8</java.version>        <maven.compiler.plugin.version>3.8.1</maven.compiler.plugin.version>        <maven.resources.plugin.version>3.1.0</maven.resources.plugin.version>        <mysql.connector.version>5.1.47</mysql.connector.version>        <druid.spring.boot.starter.version>1.1.17</druid.spring.boot.starter.version>        <mybatis.spring.boot.starter.version>1.3.4</mybatis.spring.boot.starter.version>        <fastjson.version>1.2.58</fastjson.version>        <commons.lang3.version>3.9</commons.lang3.version>        <joda.time.version>2.10.2</joda.time.version>        <webmagic.core.version>0.7.3</webmagic.core.version>    </properties>    <dependencies>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-devtools</artifactId>            <scope>runtime</scope>            <optional>true</optional>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-test</artifactId>            <scope>test</scope>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-configuration-processor</artifactId>            <optional>true</optional>        </dependency>        <dependency>            <groupId>mysql</groupId>            <artifactId>mysql-connector-java</artifactId>            <version>${mysql.connector.version}</version>        </dependency>        <dependency>            <groupId>com.alibaba</groupId>            <artifactId>druid-spring-boot-starter</artifactId>            <version>${druid.spring.boot.starter.version}</version>        </dependency>        <dependency>            <groupId>org.mybatis.spring.boot</groupId>            <artifactId>mybatis-spring-boot-starter</artifactId>            <version>${mybatis.spring.boot.starter.version}</version>        </dependency>        <dependency>            <groupId>com.alibaba</groupId>            <artifactId>fastjson</artifactId>            <version>${fastjson.version}</version>        </dependency>        <dependency>            <groupId>org.apache.commons</groupId>            <artifactId>commons-lang3</artifactId>            <version>${commons.lang3.version}</version>        </dependency>        <dependency>            <groupId>joda-time</groupId>            <artifactId>joda-time</artifactId>            <version>${joda.time.version}</version>        </dependency>        <dependency>            <groupId>us.codecraft</groupId>            <artifactId>webmagic-core</artifactId>            <version>${webmagic.core.version}</version>            <exclusions>                <exclusion>                    <groupId>org.slf4j</groupId>                    <artifactId>slf4j-log4j12</artifactId>                </exclusion>            </exclusions>        </dependency>    </dependencies>    <build>        <plugins>            <plugin>                <groupId>org.apache.maven.plugins</groupId>                <artifactId>maven-compiler-plugin</artifactId>                <version>${maven.compiler.plugin.version}</version>                <configuration>                    <source>${java.version}</source>                    <target>${java.version}</target>                    <encoding>${project.build.sourceEncoding}</encoding>                </configuration>            </plugin>            <plugin>                <groupId>org.apache.maven.plugins</groupId>                <artifactId>maven-resources-plugin</artifactId>                <version>${maven.resources.plugin.version}</version>                <configuration>                    <encoding>${project.build.sourceEncoding}</encoding>                </configuration>            </plugin>            <plugin>                <groupId>org.springframework.boot</groupId>                <artifactId>spring-boot-maven-plugin</artifactId>                <configuration>                    <fork>true</fork>                    <addResources>true</addResources>                </configuration>                <executions>                    <execution>                        <goals>                            <goal>repackage</goal>                        </goals>                    </execution>                </executions>            </plugin>        </plugins>    </build>    <repositories>        <repository>            <id>public</id>            <name>aliyun nexus</name>            <url>http://maven.aliyun.com/nexus/content/groups/public/</url>            <releases>                <enabled>true</enabled>            </releases>        </repository>    </repositories>    <pluginRepositories>        <pluginRepository>            <id>public</id>            <name>aliyun nexus</name>            <url>http://maven.aliyun.com/nexus/content/groups/public/</url>            <releases>                <enabled>true</enabled>            </releases>            <snapshots>                <enabled>false</enabled>            </snapshots>        </pluginRepository>    </pluginRepositories></project>

2.我的项目配置文件 application.properties

配置mysql数据源，druid数据库连接池以及MyBatis的mapper文件的地位。

# mysql数据源配置spring.datasource.name=mysqlspring.datasource.type=com.alibaba.druid.pool.DruidDataSourcespring.datasource.driver-class-name=com.mysql.jdbc.Driverspring.datasource.url=jdbc:mysql://192.168.0.63:3306/gjhzjl?useUnicode=true&characterEncoding=utf8&useSSL=false&allowMultiQueries=truespring.datasource.username=rootspring.datasource.password=root# druid数据库连接池配置spring.datasource.druid.initial-size=5spring.datasource.druid.min-idle=5spring.datasource.druid.max-active=10spring.datasource.druid.max-wait=60000spring.datasource.druid.validation-query=SELECT 1 FROM DUALspring.datasource.druid.test-on-borrow=falsespring.datasource.druid.test-on-return=falsespring.datasource.druid.test-while-idle=truespring.datasource.druid.time-between-eviction-runs-millis=60000spring.datasource.druid.min-evictable-idle-time-millis=300000spring.datasource.druid.max-evictable-idle-time-millis=600000# mybatis配置mybatis.mapperLocations=classpath:mapper/**/*.xml

3.数据库表构造

CREATE TABLE `cms_content` (  `contentId` varchar(40) NOT NULL COMMENT '内容ID',  `title` varchar(150) NOT NULL COMMENT '题目',  `content` longtext COMMENT '文章内容',  `releaseDate` datetime NOT NULL COMMENT '公布日期',  PRIMARY KEY (`contentId`)) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='CMS内容表';

4.实体类

import java.util.Date;public class CmsContentPO {    private String contentId;    private String title;    private String content;    private Date releaseDate;    public String getContentId() {        return contentId;    }    public void setContentId(String contentId) {        this.contentId = contentId;    }    public String getTitle() {        return title;    }    public void setTitle(String title) {        this.title = title;    }    public String getContent() {        return content;    }    public void setContent(String content) {        this.content = content;    }    public Date getReleaseDate() {        return releaseDate;    }    public void setReleaseDate(Date releaseDate) {        this.releaseDate = releaseDate;    }}

5.mapper接口

public interface CrawlerMapper {    int addCmsContent(CmsContentPO record);}

6.CrawlerMapper.xml文件

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd"><mapper namespace="com.hyzx.qbasic.dao.CrawlerMapper">    <insert id="addCmsContent" parameterType="com.hyzx.qbasic.model.CmsContentPO">        insert into cms_content (contentId,                                 title,                                 releaseDate,                                 content)        values (#{contentId,jdbcType=VARCHAR},                #{title,jdbcType=VARCHAR},                #{releaseDate,jdbcType=TIMESTAMP},                #{content,jdbcType=LONGVARCHAR})    </insert></mapper>

7.XXX页面内容解决类XXXPageProcessor

次要用于解析爬取到的XXX html页面。

@Componentpublic class XXXPageProcessor implements PageProcessor {    private Site site = Site.me().setRetryTimes(3).setSleepTime(1000);    @Override    public void process(Page page) {        page.addTargetRequests(page.getHtml().links().regex("https://www\\.xxx\\.com/question/\\d+/answer/\\d+.*").all());        page.putField("title", page.getHtml().xpath("//h1[@class='QuestionHeader-title']/text()").toString());        page.putField("answer", page.getHtml().xpath("//div[@class='QuestionAnswer-content']/tidyText()").toString());        if (page.getResultItems().get("title") == null) {            // 如果是列表页，跳过此页，pipeline不进行后续解决            page.setSkip(true);        }    }    @Override    public Site getSite() {        return site;    }}

8.XXX数据处理类XXXPipeline

次要用于将XXX html页面解析出的数据存储到mysql数据库。

@Componentpublic class XXXPipeline implements Pipeline {    private static final Logger LOGGER = LoggerFactory.getLogger(XXXPipeline.class);    @Autowired    private CrawlerMapper crawlerMapper;    public void process(ResultItems resultItems, Task task) {        String title = resultItems.get("title");        String answer = resultItems.get("answer");        CmsContentPO contentPO = new CmsContentPO();        contentPO.setContentId(UUID.randomUUID().toString());        contentPO.setTitle(title);        contentPO.setReleaseDate(new Date());        contentPO.setContent(answer);        try {            boolean success = crawlerMapper.addCmsContent(contentPO) > 0;            LOGGER.info("保留文章胜利：{}", title);        } catch (Exception ex) {            LOGGER.error("保留文章失败", ex);        }    }}

9.爬虫工作类XXXTask

每十分钟启动一次爬虫。

@Componentpublic class XXXTask {    private static final Logger LOGGER = LoggerFactory.getLogger(XXXPipeline.class);    @Autowired    private XXXPipeline XXXPipeline;    @Autowired    private XXXPageProcessor xxxPageProcessor;    private ScheduledExecutorService timer = Executors.newSingleThreadScheduledExecutor();    public void crawl() {        // 定时工作，每10分钟爬取一次        timer.scheduleWithFixedDelay(() -> {            Thread.currentThread().setName("xxxCrawlerThread");            try {                Spider.create(xxxPageProcessor)                        // 从https://www.xxx.com/explore开始抓                        .addUrl("https://www.xxx.com/explore")                        // 抓取到的数据存数据库                        .addPipeline(xxxPipeline)                        // 开启2个线程抓取                        .thread(2)                        // 异步启动爬虫                        .start();            } catch (Exception ex) {                LOGGER.error("定时抓取数据线程执行异样", ex);            }        }, 0, 10, TimeUnit.MINUTES);    }}

10.Spring boot程序启动类

@SpringBootApplication@MapperScan(basePackages = "com.hyzx.qbasic.dao")public class Application implements CommandLineRunner {    @Autowired    private XXXTask xxxTask;    public static void main(String[] args) throws IOException {        SpringApplication.run(Application.class, args);    }    @Override    public void run(String... strings) throws Exception {        // 爬取数据        xxxTask.crawl();    }}

最初，关注公众号Java技术栈，在后盾回复：面试，能够获取我整顿的 Java/ Spring Boot 系列面试题和答案，十分齐全。

近期热文举荐：

1.1,000+ 道 Java面试题及答案整顿(2021最新版)

2.别在再满屏的 if/ else 了，试试策略模式，真香！！

3.卧槽！Java 中的 xx ≠ null 是什么新语法？

4.Spring Boot 2.5 重磅公布，光明模式太炸了！

5.《Java开发手册（嵩山版）》最新公布，速速下载！

感觉不错，别忘了顺手点赞+转发哦！