jdk11 HttpClient 爬虫

目的: 获得目标背单词网站中的单词, 写了一个简单的小爬虫, 使用jdk11

 

到此, 思路明确!

第一步,  把冰箱门...., 串词了,Sorry!!

第一步, 调用登陆接口, 拿到sessionid!

第二步, 带着sessionid到单词列表页, 拿到body, 转成Document, 开始"借鉴"单词!

是不是So easy!

package com.***;

import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import org.junit.Test;

import java.io.IOException;
import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;
import java.util.HashMap;

/**
 * @author jqw1122@foxmail.com
 * @description 爬啊爬
 * @date 2/23/2019 17:14 
 */
public class Crawler {

    @Test
    public void crawler() {
        String loginUrl = "http://www.cikuang.me/login";
        String fromBody = "username=jqw1122@foxamil.com&password=qweqwe123";
        String wordSetUrl= "http://www.cikuang.me/member/learningset?id=4573";


        HttpClient httpClient = HttpClient.newBuilder().build();
        HttpRequest request = HttpRequest.newBuilder()
                .uri(URI.create(loginUrl))
                .header("Content-Type","application/x-www-form-urlencoded")
                .POST(HttpRequest.BodyPublishers.ofString(fromBody))
                .build();


        httpClient.sendAsync(request, HttpResponse.BodyHandlers.ofString())
                .thenApply(HttpResponse::headers)
                .thenAccept(headers -> {
            //cookie有好多 我只要sid啊魂淡!
            var cookieMap = new HashMap<String, String>();
            headers.map().get("set-cookie").forEach(c -> {
                String[] split = c.split(";");
                for (String s : split) {
                    String[] split1 = s.split("=");
                    if (split1.length == 2)
                        cookieMap.put(split1[0], split1[1]);
                }
            });
            //拿着sid去单词页面
            String cookie_sid = cookieMap.get("sid");
            HttpRequest request2 = HttpRequest.newBuilder()
                    .uri(URI.create(wordSetUrl))
                    .header("Content-Type","application/x-www-form-urlencoded")
                    .header("Cookie", "sid=" + cookie_sid)
                    .GET()
                    .build();
            httpClient.sendAsync(request2, HttpResponse.BodyHandlers.ofString())
                    .thenApply(HttpResponse::body)
                    .thenAccept(htmlString ->{
                //获取到body转成Document, 方便借鉴...
                Document htmlDocument = Jsoup.parse(htmlString);
                
                //获取单词table id
                Element wordListTable = htmlDocument.getElementById("wordListTable");
                Elements trs = wordListTable.getElementsByTag("tr");
                trs.forEach(t -> {
                    Elements tds = t.children();
                    String en = tds.get(0).child(0).text();
                    String cn = tds.get(1).text();
                    System.out.println("单词---->>> " + en + ":" + cn);
                });
            }).join();
        } ).join();
    }
}

 爬虫2: 目的:获取KMF中托福-听力-所有练习题的题目的音频

 

/**
 * @author jqw1122@foxmail.com
 * @description
 * @date 2/23/2019 17:14
 */
public class Crawler {
    @Test
    public void crawlerKMF() {
        String mainUrl= "https://toefl.kmf.com";
        String mainUrl1= "https://toefl.kmf.com/listen/ets/order/";
        String localFilePath = "C:\\kmf_audio\\";

        HttpClient httpClient = HttpClient.newBuilder().build();

        List<String> detailUrlList = new ArrayList<>();
        e:for (int i = 0; i <= 5; i++) {
            for (int j = 1; j <= 4; j++) {
                String url = mainUrl1 + i + "/0/" + j;
                HttpRequest request = HttpRequest.newBuilder()
                        .uri(URI.create(url))
                        .header("Content-Type","application/x-www-form-urlencoded")
                        .GET()
                        .build();
                httpClient.sendAsync(request, HttpResponse.BodyHandlers.ofString()).thenApply(HttpResponse::body).thenAccept(bodyString -> {
                    Document htmlDocument = Jsoup.parse(bodyString);
                    Elements elements = htmlDocument.getElementsByAttributeValue("class", "check-links js-check-link");
                    elements.forEach(tagA -> {
                        String href = tagA.attr("href");
                        detailUrlList.add(href);
                    });
                    System.out.println("page detail number:" + elements.size());
                }).join();
                //test
//            if (1==1) break e;
            }
        }
        System.out.println("page/file number:  "+detailUrlList.size());

        var fileList = new ArrayList<Map<String, String>>();

        System.out.println(LocalTime.now().toString() + " start get audio file url in detail page");
        detailUrlList.parallelStream().forEach(href -> {
            HttpRequest request = HttpRequest.newBuilder()
                    .uri(URI.create(mainUrl + href))
                    .header("Content-Type","application/x-www-form-urlencoded")
                    .GET()
                    .build();
            httpClient.sendAsync(request, HttpResponse.BodyHandlers.ofString()).thenApply(HttpResponse::body).thenAccept(bodyString -> {
                Document htmlDocument = Jsoup.parse(bodyString);
                Elements bts = htmlDocument.getElementsByAttributeValue("class", "i-title js-top-title");
                String fileName = bts.get(0).text();
                Elements audios = htmlDocument.getElementsByAttributeValue("class", "question-audio-cont js-question-audio  g-player-control video-left-content js-player-record");
                String fileUrl = audios.get(0).attr("data-url");
                fileList.add(Map.of("fileName", fileName.toLowerCase().replace(" ", "_") + ".mp3", "fileUrl", fileUrl));
//                System.out.println(fileName+ "--"+fileUrl);
            }).join();
        });
        System.out.println(LocalTime.now().toString() + " finish get audio file url in detail page! start downloading files to local!");


        fileList.parallelStream().forEach(t -> {
            try (InputStream ins = new URL(t.get("fileUrl")).openStream()) {
                Path target = Paths.get(localFilePath, t.get("fileName"));
//                Files.createDirectories(target.getParent());
                Files.copy(ins, target, StandardCopyOption.REPLACE_EXISTING);

            } catch (IOException e) {
                System.out.println("download failed! fileName:" + t.get("fileName") + " fileUrl:" + t.get("fileUrl"));
                e.printStackTrace();
            }
        });
        System.out.println(LocalTime.now().toString() + " download completed");


    }



}

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来源：oschina

链接：https://my.oschina.net/u/2757155/blog/3013965