使用Jsoup采集拉勾网招聘信息

墨蓝 2022-09-25 14:24 231阅读 0赞

本文使用[Jsoup][]采集[拉勾网][Link 1]招聘数据并写入CSV文件中，实现非常简单，在此不做多余的解释，如有问题可留言交流。

数据模型：job.java

package xyz.baal.jsoup;
    
    public class Job {
    	
    	private String jobname;//职位名称
    	private String salary;//薪水
    	private String place;//工作地点
    	private String experience;//工作经验
    	private String educational;//学历
    	private String business;//业务
    	private String stage;//发展阶段
    	private String company;//公司名称
    	
    	public Job() {
    		super();
    	}
    	
    	public Job(String jobname, String salary, String place, String experience, String educational, String business,
    			String stage, String company) {
    		super();
    		this.jobname = jobname;
    		this.salary = salary;
    		this.place = place;
    		this.experience = experience;
    		this.educational = educational;
    		this.business = business;
    		this.stage = stage;
    		this.company = company;
    	}
    
    	public String getJobname() {
    		return jobname;
    	}
    	public void setJobname(String jobname) {
    		this.jobname = jobname;
    	}
    	public String getSalary() {
    		return salary;
    	}
    	public void setSalary(String salary) {
    		this.salary = salary;
    	}
    	public String getPlace() {
    		return place;
    	}
    	public void setPlace(String place) {
    		this.place = place;
    	}
    	public String getExperience() {
    		return experience;
    	}
    	public void setExperience(String experience) {
    		this.experience = experience;
    	}
    	public String getEducational() {
    		return educational;
    	}
    	public void setEducational(String educational) {
    		this.educational = educational;
    	}
    	public String getBusiness() {
    		return business;
    	}
    	public void setBusiness(String business) {
    		this.business = business;
    	}
    	public String getStage() {
    		return stage;
    	}
    	public void setStage(String stage) {
    		this.stage = stage;
    	}
    	public String getCompany() {
    		return company;
    	}
    	public void setCompany(String company) {
    		this.company = company;
    	}
    
    	@Override
    	public String toString() {
    		return "Job [jobname=" + jobname + ", salary=" + salary + ", place=" + place + ", experience=" + experience
    				+ ", educational=" + educational + ", business=" + business + ", stage=" + stage + ", company="
    				+ company + "]";
    	}
    }

写入CSV使用的是[CSVReader][]，由于源文件中就CsvReader、CsvWriter两个文件，在这里直接引用了CsvWriter源文件（附：[API文档][API]）。

获取各个招聘职位首页链接，如java招聘链接为//www.lagou.com/zhaopin/Java/

package xyz.baal.jsoup;
    
    import java.io.File;
    import java.io.IOException;
    import java.util.ArrayList;
    import java.util.List;
    
    import org.jsoup.Jsoup;
    import org.jsoup.nodes.Document;
    import org.jsoup.nodes.Element;
    import org.jsoup.select.Elements;
    
    /**
     * 根据拉勾网首页获取各个招聘职位首页链接
     * 
     * @author 
     *
     */
    public class GetZPURL {
    	
    	private List<String> zpURLlist = new ArrayList<String>();//存放各个招聘职位首页链接
    	
    	public GetZPURL(){
    		super();
    	}
    	
    	/**
    	 * 网络加载html文档
    	 * @param url	文档url
    	 */
    	public void loadInternet(String url) {
    		Document doc = null;
    		try {
    			doc = Jsoup.connect(url)
    					.userAgent("Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.101 Safari/537.36")
    					.timeout(5000)
    					.get();
    		} catch (IOException e) {
    			System.out.println("获取招聘URL失败。");
    			return;
    		}
    		Element content = doc.getElementById("container");
    		Elements links = content.getElementsByTag("a");
    		for (Element link : links) {
    			String linkHref = link.attr("href");
    			if(isZp(linkHref)){
    				zpURLlist.add(linkHref);
    			}
    		}
    	}
    	
    	/**
    	 * 从本地加载html文档
    	 * @param path	文档路径
    	 * @param charset	文档字符集
    	 * @param baseURL	基本url，当链接中存在相对路径时作为前缀
    	 * @throws IOException	文件不存在或无法读取时抛出此异常
    	 */
    	public void loadLocal(String path ,String charset, String baseURL) throws IOException {
    
    		File input = new File(path);
    		Document doc = Jsoup.parse(input, charset, baseURL);
    		Element content = doc.getElementById("container");
    		Elements links = content.getElementsByTag("a");
    		for (Element link : links) {
    			String linkHref = link.attr("href");
    			if(isZp(linkHref)){
    				zpURLlist.add(linkHref);
    			}
    		}
    	}
    	
    	public boolean isZp(String url){
    		if(url.indexOf("//www.lagou.com/zhaopin/")!=-1&&url.length()>24){
    			return true;
    		}else {
    			return false;
    		}
    	}
    
    	public List<String> getZpURLlist() {
    		return zpURLlist;
    	}
    }

>   
>

> 获取某一招聘职位的30x15条数据，并写入CSV文件。

package xyz.baal.jsoup;
    
    import java.io.BufferedWriter;
    import java.io.File;
    import java.io.FileWriter;
    import java.io.IOException;
    import java.nio.charset.Charset;
    import java.util.ArrayList;
    import java.util.Iterator;
    import java.util.List;
    import java.util.regex.Matcher;
    import java.util.regex.Pattern;
    
    import org.jsoup.Jsoup;
    import org.jsoup.nodes.Document;
    import org.jsoup.nodes.Element;
    import org.jsoup.select.Elements;
    
    import com.csvreader.CsvWriter;
    
    /**
     * 获取拉勾网某一个职位的30x15条招聘信息
     * 
     * @author
     * 
     */
    public class GetJob implements Runnable{
    
    	private String zpUrl;// 某招聘职位对应的原始URL
    	private List<String> zpUrlList = new ArrayList<String>(); // 每个分页对应的URL
    	private List<String> jobUrlList = new ArrayList<String>();// 每条招聘信息对应的URL
    	private List<Job> joblist = new ArrayList<Job>();// 存放30x15条招聘信息
    
    	private static final String A_HREF = "//www.lagou.com/jobs/\\d+.html"; // href格式 //www.lagou.com/jobs/2350451.html
    	private static final String PATH = "D:/"; // 文件存放路径
    
    	private String jobName = "";//招聘职位名称
    
    	/**
    	 * 
    	 * @param url 招聘职位首页url,如java、hadoop等招聘职位
    	 */
    	public GetJob(String url) {
    		zpUrl = url;
    	}
    
    	/**
    	 * 在此方法内完成某一招聘职位的450条数据抓取
    	 */
    	public void init() {
    		
    		// 构建30个分页URL
    		zpUrlList.add(zpUrl + "?filterOption=3");
    		for (int i = 2; i <= 30; i++) {
    			zpUrlList.add(zpUrl + i + "/?filterOption=3");
    		}
    
    		// 提取每个分页中的招聘信息URL
    		for (String string : zpUrlList) {
    			Document doc = null;
    			try {
    				doc = Jsoup.connect("http:" + string)
    						.userAgent("Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.101 Safari/537.36")
    						.timeout(5000)
    						.get();
    			} catch (IOException e) {
    				continue;
    			}
    			Element content = doc.getElementById("s_position_list");
    			if (content == null) {
    				continue;
    			}
    
    			Elements links = content.getElementsByTag("a");
    			if (links == null) {
    				continue;
    			}
    			for (Element link : links) {
    				String linkHref = link.attr("href");
    				Pattern pattern = Pattern.compile(A_HREF, Pattern.CASE_INSENSITIVE);
    				Matcher matcher = pattern.matcher(linkHref);
    				if (matcher.find()) {
    					jobUrlList.add("http:" + linkHref);
    				}
    			}
    			if (jobName == "") {
    				jobName = doc.select("title").first().text().split("-")[0];
    			}
    		}
    
    		// 根据招聘信息URL提取招聘详细信息
    		for (String string : jobUrlList) {
    			Job job = new Job();
    			Document doc = null;
    			try {
    				doc = Jsoup.connect(string)
    						.userAgent("Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.101 Safari/537.36")
    						.timeout(5000)
    						.get();
    				job.setJobname(jobName);
    
    				Element content = doc.getElementById("container");
    				Element job_request = content.select(".job_request p").first();
    				if (job_request != null) {
    					if (job_request.child(0) != null) {
    						job.setSalary(job_request.child(0).text());
    						job.setPlace(job_request.child(1).text());
    						job.setExperience(job_request.child(2).text());
    						job.setEducational(job_request.child(3).text());
    					} else {
    						continue;
    					}
    
    				} else {
    					continue;
    				}
    
    				Element cpy = doc.getElementById("job_company");
    				if (cpy.childNodeSize()>=2) {
    					job.setCompany(cpy.child(0).child(0).child(0).attr("alt"));
    					job.setBusiness(cpy.child(1).child(0).child(0).ownText());
    					job.setStage(cpy.child(1).child(2).child(0).ownText());
    				} else {
    					continue;
    				}
    				joblist.add(job);
    			} catch (IOException e) {
    				continue;
    			}
    		}
    	}
    
    	public List<Job> getJoblist() {
    		return joblist;
    	}
    
    	/**
    	 * 将采集数据写入txt文件中
    	 */
    	public void writeTxtFile() {
    		if (joblist.size() == 0 || joblist == null) {
    			return;
    		}
    		File file = new File(PATH + joblist.get(0).getJobname() + ".txt");
    		FileWriter fw = null;
    		BufferedWriter bw = null;
    		Iterator<Job> iter = joblist.iterator();
    		try {
    			fw = new FileWriter(file);
    			bw = new BufferedWriter(fw);
    			while (iter.hasNext()) {
    				bw.write(iter.next().toString());
    				bw.newLine();
    			}
    			bw.flush();
    		} catch (Exception e) {
    			e.printStackTrace();
    		} finally {
    			try {
    				if (bw != null) {
    					bw.close();
    				}
    				if (fw != null) {
    					fw.close();
    				}
    			} catch (Exception e) {
    				e.printStackTrace();
    			}
    		}
    	}
    
    	/**
    	 * 将采集数据写入CSV文件中
    	 */
    	public void writeCSVFile() {
    		CsvWriter wr = null;
    		if (joblist.size() == 0 || joblist == null) {
    			return;
    		}
    		try {
    			String csvFilePath = PATH + joblist.get(0).getJobname() + ".csv";
    			wr = new CsvWriter(csvFilePath, ',', Charset.forName("GBK"));
    			String[] header = { "职位名称", "薪水", "工作地点", "工作经验", "学历", "公司名称", "公司业务", "发展阶段"};
    			wr.writeRecord(header);
    			for (Job job : joblist) {
    				String[] jobstr = { job.getJobname(), job.getSalary(), job.getPlace(), job.getExperience(),
    						job.getEducational(), job.getCompany(), job.getBusiness(), job.getStage() };
    				wr.writeRecord(jobstr);
    			}
    		} catch (IOException e) {
    			e.printStackTrace();
    		} finally {
    			if (wr != null) {
    				wr.close();
    			}
    		}
    	}
    
    	@Override
    	public void run() {
    		init();
    		writeCSVFile();
    		System.out.println(jobName+"--End");
    	}
    }

> 采集测试：

package xyz.baal.jsoup;
    
    import java.io.IOException;
    import java.util.ArrayList;
    import java.util.List;
    import java.util.concurrent.ArrayBlockingQueue;
    import java.util.concurrent.BlockingQueue;
    import java.util.concurrent.ThreadPoolExecutor;
    import java.util.concurrent.TimeUnit;
    
    public class Test {
    
    public static List<String> zpURLlist = new ArrayList<String>();
    	
    	public static void main(String[] args) throws IOException {
    
    		 //创建等待任务队列   
            BlockingQueue<Runnable> bqueue = new ArrayBlockingQueue<Runnable>(20);   
            //创建线程池，池中保存的线程数为3，池中允许的最大线程数为4  
            ThreadPoolExecutor pool = new ThreadPoolExecutor(3,4,50,TimeUnit.MILLISECONDS,bqueue);   
    		
    		Runnable job1 = new GetJob("//www.lagou.com/zhaopin/iOS/");
    		Runnable job2 = new GetJob("//www.lagou.com/zhaopin/C/");
    		Runnable job3 = new GetJob("//www.lagou.com/zhaopin/C++/");
    		Runnable job4 = new GetJob("//www.lagou.com/zhaopin/Python/");
    		Runnable job5 = new GetJob("//www.lagou.com/zhaopin/HTML5/");
    		Runnable job6 = new GetJob("//www.lagou.com/zhaopin/webqianduan/");
    		
    		pool.execute(job1);
    		pool.execute(job2);
    		pool.execute(job3);
    		pool.execute(job4);
    		pool.execute(job5);
    		pool.execute(job6);
    		//关闭线程池
    		pool.shutdown();
    	}
    }

> 如需IP代理可在此网站寻找代理资源：[http://www.xicidaili.com/][http_www.xicidaili.com]
> 
> GitHub：[点这里][Link 2]

[Jsoup]: https://jsoup.org/
[Link 1]: http://www.lagou.com
[CSVReader]: https://www.csvreader.com/java_csv.php
[API]: http://javacsv.sourceforge.net/
[http_www.xicidaili.com]: http://www.xicidaili.com/
[Link 2]: https://github.com/holif/Jsoup_Lagou