springboot+webmagic如何实现java爬虫jdbc及mysql
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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:
us.codecraft webmagic-core 0.7.3 us.codecraft webmagic-extension 0.7.3 us.codecraft webmagic-extension 0.7.3 org.slf4j slf4j-log4j12
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(ListstringList) { 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(); Listls = page.getHtml().xpath("//div[@class='v']/div[@class='v-meta va']/div[@class='v-meta-title']/a/text()").all(); //hrefs List ls1 = page.getHtml().xpath("//div[@class='v']/div[@class='v-link']/a/@href").all();//获取a标签的href List 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 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(){ Listlist = 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);
springboot是什么
springboot一种全新的编程规范,其设计目的是用来简化新Spring应用的初始搭建以及开发过程,SpringBoot也是一个服务于框架的框架,服务范围是简化配置文件。
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