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);
以上这篇springboot+webmagic实现java爬虫jdbc及mysql的方法就是小编分享给大家的全部内容了，希望能给大家一个参考。
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