springboot+webmagic实现java爬虫jdbc及mysql

前段时间需要爬取网页上的信息，自己对于爬虫没有任何了解，就了解了一下webmagic，写了个简单的爬虫。

一、首先介绍一下webmagic：

webmagic采用完全模块化的设计，功能覆盖整个爬虫的生命周期(链接提取、页面下载、内容抽取、持久化)，支持多线程抓取，分布式抓取，并支持自动重试、自定义UA/cookie等功能。

实现理念：

Maven依赖：

<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>

    <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>

jdbc模式：

ublic class CsdnBlogDao {
    private Connection conn = null;
    private Statement stmt = null;

    public CsdnBlogDao() {
        try {
            Class.forName("com.mysql.jdbc.Driver");
            String url = "jdbc:mysql://localhost:3306/test?"
                    + "user=***&password=***3&useUnicode=true&characterEncoding=UTF8";
            conn = DriverManager.getConnection(url);
            stmt = conn.createStatement();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        }

    }

    public int add(CsdnBlog csdnBlog) {
        try {
            String sql = "INSERT INTO `test`.`csdnblog` (`keyes`, `titles`, `content` , `dates`, `tags`, `category`, `views`, `comments`, `copyright`) VALUES (?, ?, ?, ?, ?, ?, ?, ?,?);";
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setInt(1, csdnBlog.getKey());
            ps.setString(2, csdnBlog.getTitle());
            ps.setString(3,csdnBlog.getContent());
            ps.setString(4, csdnBlog.getDates());
            ps.setString(5, csdnBlog.getTags());
            ps.setString(6, csdnBlog.getCategory());
            ps.setInt(7, csdnBlog.getView());
            ps.setInt(8, csdnBlog.getComments());
            ps.setInt(9, csdnBlog.getCopyright());
            return ps.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return -1;
    }
}

实体类：

public class CsdnBlog {
    private int key;// 编号

    private String title;// 标题

    private String dates;// 日期

    private String tags;// 标签

    private String category;// 分类

    private int view;// 阅读人数

    private int comments;// 评论人数

    private int copyright;// 是否原创

    private String content; //文字内容

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

    public int getKey() {
        return key;
    }

    public void setKey(int key) {
        this.key = key;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getDates() {
        return dates;
    }

    public void setDates(String dates) {
        this.dates = dates;
    }

    public String getTags() {
        return tags;
    }

    public void setTags(String tags) {
        this.tags = tags;
    }

    public String getCategory() {
        return category;
    }

    public void setCategory(String category) {
        this.category = category;
    }

    public int getView() {
        return view;
    }

    public void setView(int view) {
        this.view = view;
    }

    public int getComments() {
        return comments;
    }

    public void setComments(int comments) {
        this.comments = comments;
    }

    public int getCopyright() {
        return copyright;
    }

    public void setCopyright(int copyright) {
        this.copyright = copyright;
    }

    @Override
    public String toString() {
        return "CsdnBlog [key=" + key + ", title=" + title + ", content=" + content + ",dates=" + dates + ", tags=" + tags + ", category="
                + category + ", view=" + view + ", comments=" + comments + ", copyright=" + copyright + "]";
    }
}

启动类：

public class CsdnBlogPageProcessor implements PageProcessor {


    private static String username="CHENYUFENG1991";  // 设置csdn用户名

    private static int size = 0;// 共抓取到的文章数量

    // 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(1000);

    public Site getSite() {
        return site;
    }


    // process是定制爬虫逻辑的核心接口，在这里编写抽取逻辑
    public void process(Page page) {
        // 列表页
        if (!page.getUrl().regex("http://blog\.csdn\.net/" + username + "/article/details/\d+").match()) {
            // 添加所有文章页
            page.addTargetRequests(page.getHtml().xpath("//div[@id='article_list']").links()// 限定文章列表获取区域
                    .regex("/" + username + "/article/details/\d+")
                    .replace("/" + username + "/", "http://blog.csdn.net/" + username + "/")// 巧用替换给把相对url转换成绝对url
                    .all());
            // 添加其他列表页
            page.addTargetRequests(page.getHtml().xpath("//div[@id='papelist']").links()// 限定其他列表页获取区域
                    .regex("/" + username + "/article/list/\d+")
                    .replace("/" + username + "/", "http://blog.csdn.net/" + username + "/")// 巧用替换给把相对url转换成绝对url
                    .all());
            // 文章页
        } else {
            size++;// 文章数量加1
            // 用CsdnBlog类来存抓取到的数据，方便存入数据库
            CsdnBlog csdnBlog = new CsdnBlog();
            // 设置编号
            csdnBlog.setKey(Integer.parseInt(
                    page.getUrl().regex("http://blog\.csdn\.net/" + username + "/article/details/(\d+)").get()));
            // 设置标题
            csdnBlog.setTitle(
                    page.getHtml().xpath("//div[@class='article_title']//span[@class='link_title']/a/text()").get());

            //设置内容
            csdnBlog.setContent(
                    page.getHtml().xpath("//div[@class='article_content']/allText()").get());

            // 设置日期
            csdnBlog.setDates(
                    page.getHtml().xpath("//div[@class='article_r']/span[@class='link_postdate']/text()").get());
            // 设置标签（可以有多个，用,来分割）
            csdnBlog.setTags(listToString(page.getHtml().xpath("//div[@class='article_l']/span[@class='link_categories']/a/allText()").all()));
            // 设置类别（可以有多个，用,来分割）
            csdnBlog.setCategory(listToString(page.getHtml().xpath("//div[@class='category_r']/label/span/text()").all()));
            // 设置阅读人数
            csdnBlog.setView(Integer.parseInt(page.getHtml().xpath("//div[@class='article_r']/span[@class='link_view']")
                    .regex("(\d+)人阅读").get()));
            // 设置评论人数
            csdnBlog.setComments(Integer.parseInt(page.getHtml()
                    .xpath("//div[@class='article_r']/span[@class='link_comments']").regex("\((\d+)\)").get()));
            // 设置是否原创
            csdnBlog.setCopyright(page.getHtml().regex("bog_copyright").match() ? 1 : 0);
            // 把对象存入数据库
            new CsdnBlogDao().add(csdnBlog);
            // 把对象输出控制台
            System.out.println(csdnBlog);
        }
    }

    // 把list转换为string，用,分割
    public static String listToString(List<String> stringList) {
        if (stringList == null) {
            return null;
        }
        StringBuilder result = new StringBuilder();
        boolean flag = false;
        for (String string : stringList) {
            if (flag) {
                result.append(",");
            } else {
                flag = true;
            }
            result.append(string);
        }
        return result.toString();
    }

    public static void main(String[] args) {
        long startTime, endTime;
        System.out.println("【爬虫开始】...");
        startTime = System.currentTimeMillis();
        // 从用户博客首页开始抓，开启5个线程，启动爬虫
        Spider.create(new CsdnBlogPageProcessor()).addUrl("http://blog.csdn.net/" + username).thread(5).run();
        endTime = System.currentTimeMillis();
        System.out.println("【爬虫结束】共抓取" + size + "篇文章，耗时约" + ((endTime - startTime) / 1000) + "秒，已保存到数据库，请查收！");
    }
}

使用mysql类型：

public class GamePageProcessor implements PageProcessor {

    private static final Logger logger = LoggerFactory.getLogger(GamePageProcessor.class);
    private static DianJingService d;
    private static BannerService bs;
    private static SportService ss;
    private static YuLeNewsService ys;

    private static UpdateService ud ;
    // 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(1000);

    public Site getSite() {
        return site;
    }
    // process是定制爬虫逻辑的核心接口，在这里编写抽取逻辑
    public static void main(String[] args) {
        ConfigurableApplicationContext context= SpringApplication.run(GamePageProcessor.class, args);
         d = context.getBean(DianJingService.class);
        //Spider.create(new GamePageProcessor()).addUrl("网址").thread(5).run();
    }

    public void process(Page page) {
        Selectable url = page.getUrl();
        if (url.toString().equals("网址")) {
            DianJingVideo dv = new DianJingVideo();
            List<String> ls = page.getHtml().xpath("//div[@class='v']/div[@class='v-meta va']/div[@class='v-meta-title']/a/text()").all();
            //hrefs
            List<String> ls1 = page.getHtml().xpath("//div[@class='v']/div[@class='v-link']/a/@href").all();//获取a标签的href

            List<String> ls2 = page.getHtml().xpath("//div[@class='v']/div[@class='v-meta va']/div[@class='v-meta-entry']/div[@class='v-meta-data']/span[@class='r']/text()").all();
            //photo
            List<String> ls3 = page.getHtml().xpath("//div[@class='v']/div[@class='v-thumb']/img/@src").all();

            for (int i = 0; i < 5; i++) {
                dv.setTitles(ls.get(i));
                dv.setCategory("");
                dv.setDates(ls2.get(i));
                dv.setHrefs(ls1.get(i));
                dv.setPhoto(ls3.get(i));
                dv.setSources("");

                d.addVideo(dv);

            }
        }
}

Controller：

@Controller
@RequestMapping(value = "/dianjing")
public class DianJingController {
    @Autowired
    private DianJingService s;




        /*
        手游
         */
    @RequestMapping("/dianjing")
    @ResponseBody
    public Object dianjing(){
        List<DianJing> list = s.find2();
        JSONObject jo = new JSONObject();
        if(list!=null){

            jo.put("code",0);
            jo.put("success",true);
            jo.put("count",list.size());
            jo.put("list",list);
        }
        return jo;
    }
}

实体类就不展示了

dao层

    @Insert("insert into dianjing (titles,dates,category,hrefs,photo,sources) values(#{titles},#{dates},#{category},#{hrefs},#{photo},#{sources})")
    int adddj(DianJing dj);