上传文件至 'w10'

w10/ACMDigitalLibraryStrategy.java

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+package strategy;
+
+import model.Paper;
+import org.jsoup.Jsoup;
+import org.jsoup.nodes.Document;
+import org.jsoup.nodes.Element;
+import org.jsoup.select.Elements;
+import utils.Utils;
+import java.util.ArrayList;
+import java.util.List;
+
+public class ACMDigitalLibraryStrategy extends AbstractCrawlerStrategy {
+    @Override
+    public String getPlatformName() {
+        return "ACM Digital Library";
+    }
+    
+    @Override
+    public boolean supportsUrl(String url) {
+        return url != null && url.contains("dl.acm.org");
+    }
+    
+    @Override
+    protected List<Paper> fetchPapers(String url, int count) throws Exception {
+        List<Paper> papers = new ArrayList<>();
+        System.out.println("=== 开始使用ACM Digital Library获取论文 ===");
+        
+        addDelay(2000, 3000);
+        
+        String html = Utils.sendGetRequest(url);
+        if (html.isEmpty()) return papers;
+        
+        Document doc = Jsoup.parse(html);
+        
+        Elements paperElements = doc.select(".search__item");
+        
+        int collected = 0;
+        for (Element element : paperElements) {
+            if (collected >= count) break;
+            
+            try {
+                Element titleElement = element.selectFirst("h5 a");
+                String title = titleElement != null ? titleElement.text() : "";
+                
+                String paperUrl = titleElement != null ? titleElement.attr("href") : "";
+                if (!paperUrl.startsWith("http")) {
+                    paperUrl = "https://dl.acm.org" + paperUrl;
+                }
+                
+                Element authorsElement = element.selectFirst(".search__authors");
+                String authors = authorsElement != null ? authorsElement.text() : "";
+                
+                if (title.length() < 5 || paperUrl.isEmpty()) continue;
+                
+                papers.add(new Paper(title, authors, "", paperUrl, getPlatformName()));
+                collected++;
+            } catch (Exception e) {
+                continue;
+            }
+        }
+        
+        return papers;
+    }
+}

w10/AbstractCrawlerStrategy.java

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+package strategy;
+
+import model.Paper;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Random;
+
+public abstract class AbstractCrawlerStrategy implements CrawlerStrategy {
+    protected Random random = new Random();
+    
+    @Override
+    public List<Paper> crawl(String url, int count) throws Exception {
+        List<Paper> papers = new ArrayList<>();
+        papers.addAll(fetchPapers(url, count));
+        return papers;
+    }
+    
+    protected abstract List<Paper> fetchPapers(String url, int count) throws Exception;
+    
+    protected void addDelay(int minMs, int maxMs) {
+        try {
+            int delay = minMs + random.nextInt(maxMs - minMs + 1);
+            Thread.sleep(delay);
+        } catch (InterruptedException e) {
+            Thread.currentThread().interrupt();
+        }
+    }
+}

w10/ArXivStrategy.java

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+package strategy;
+
+import model.Paper;
+import org.jsoup.Jsoup;
+import org.jsoup.nodes.Document;
+import org.jsoup.nodes.Element;
+import org.jsoup.select.Elements;
+import utils.Utils;
+import java.util.ArrayList;
+import java.util.List;
+
+public class ArXivStrategy extends AbstractCrawlerStrategy {
+    @Override
+    public String getPlatformName() {
+        return "arXiv";
+    }
+    
+    @Override
+    public boolean supportsUrl(String url) {
+        return url != null && url.contains("arxiv.org");
+    }
+    
+    private String cleanPrefix(String text, String[] prefixes) {
+        if (text == null) {
+            return "";
+        }
+        String cleaned = text.trim();
+        for (String prefix : prefixes) {
+            if (cleaned.toLowerCase().startsWith(prefix.toLowerCase())) {
+                cleaned = cleaned.substring(prefix.length()).trim();
+            }
+        }
+        return cleaned;
+    }
+    
+    @Override
+    protected List<Paper> fetchPapers(String url, int count) throws Exception {
+        List<Paper> papers = new ArrayList<>();
+        System.out.println("=== 开始使用arXiv获取论文 ===");
+        
+        String html = Utils.sendGetRequest(url);
+        if (html.isEmpty()) return papers;
+        
+        Document doc = Jsoup.parse(html);
+        
+        Elements paperElements = doc.select(".arxiv-result");
+        
+        if (!paperElements.isEmpty()) {
+            System.out.println("检测到搜索结果页面，找到 " + paperElements.size() + " 篇论文");
+            for (Element element : paperElements) {
+                if (papers.size() >= count) break;
+                
+                try {
+                    Element titleElement = element.selectFirst(".title");
+                    String title = titleElement != null ? titleElement.text().trim() : "";
+                    title = cleanPrefix(title, new String[]{"Title:", "Title"});
+                    
+                    Element linkElement = element.selectFirst(".list-title a");
+                    String link = linkElement != null ? linkElement.attr("href") : "";
+                    if (!link.isEmpty() && !link.startsWith("http")) {
+                        link = "https://arxiv.org" + link;
+                    }
+                    
+                    Element abstractElement = element.selectFirst(".abstract");
+                    String abstractText = abstractElement != null ? abstractElement.text().trim() : "";
+                    abstractText = cleanPrefix(abstractText, new String[]{"Abstract:", "Abstract"});
+                    
+                    Element authorsElement = element.selectFirst(".authors");
+                    String authors = authorsElement != null ? authorsElement.text().trim() : "";
+                    authors = cleanPrefix(authors, new String[]{"Authors:", "Author:", "Authors", "Author"});
+                    
+                    if (title.length() < 5 || link.isEmpty()) continue;
+                    
+                    papers.add(new Paper(title, authors, abstractText, link, getPlatformName()));
+                } catch (Exception e) {
+                    continue;
+                }
+            }
+        } else {
+            Element titleElement = doc.selectFirst("h1.title.mathjax");
+            if (titleElement != null) {
+                System.out.println("检测到单个论文页面");
+                String title = titleElement.text().trim();
+                title = cleanPrefix(title, new String[]{"Title:", "Title"});
+                
+                Element authorsElement = doc.selectFirst(".authors");
+                String authors = authorsElement != null ? authorsElement.text().trim() : "";
+                authors = cleanPrefix(authors, new String[]{"Authors:", "Author:", "Authors", "Author"});
+                
+                Element abstractElement = doc.selectFirst(".abstract.mathjax");
+                String abstractText = abstractElement != null ? abstractElement.text().trim() : "";
+                abstractText = cleanPrefix(abstractText, new String[]{"Abstract:", "Abstract"});
+                
+                String link = url;
+                
+                if (title.length() >= 5 && !link.isEmpty()) {
+                    papers.add(new Paper(title, authors, abstractText, link, getPlatformName()));
+                }
+            } else {
+                System.out.println("未找到论文元素，尝试其他选择器...");
+                
+                String[] selectors = {"article", ".paper", ".document", "div[role='main']"};
+                for (String selector : selectors) {
+                    Elements articles = doc.select(selector);
+                    if (!articles.isEmpty()) {
+                        for (Element article : articles) {
+                            if (papers.size() >= count) break;
+                            
+                            String title = article.selectFirst("h1, h2, .title") != null ? 
+                                article.selectFirst("h1, h2, .title").text().trim() : "";
+                            title = cleanPrefix(title, new String[]{"Title:", "Title"});
+                            
+                            String link = article.selectFirst("a[href*='/abs/']") != null ? 
+                                "https://arxiv.org" + article.selectFirst("a[href*='/abs/']").attr("href") : url;
+                            
+                            if (title.length() >= 5 && !link.isEmpty()) {
+                                papers.add(new Paper(title, "", "", link, getPlatformName()));
+                            }
+                        }
+                        break;
+                    }
+                }
+            }
+        }
+        
+        return papers;
+    }
+}

w10/ConsoleView.java

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+package view;
+
+import model.Paper;
+import command.Command;
+import java.util.Scanner;
+
+public class ConsoleView {
+    private Scanner scanner;
+    
+    public ConsoleView() {
+        this.scanner = new Scanner(System.in);
+    }
+    
+    public void displayWelcome() {
+        System.out.println("===== 学术论文爬虫程序 =====");
+        System.out.println("输入 help 查看可用命令");
+        System.out.println();
+    }
+    
+    public String getInput() {
+        System.out.print("> ");
+        return scanner.nextLine().trim();
+    }
+    
+    public void showInfo(String message) {
+        System.out.println("[INFO] " + message);
+    }
+    
+    public void showSuccess(String message) {
+        System.out.println("[SUCCESS] " + message);
+    }
+    
+    public void showError(String message) {
+        System.out.println("[ERROR] " + message);
+    }
+    
+    public void showPaperInfo(int index, Paper paper) {
+        System.out.println(index + ". " + paper.getTitle());
+        System.out.println("   作者: " + (paper.getAuthors() != null ? paper.getAuthors() : "未知"));
+        System.out.println("   来源: " + (paper.getPlatform() != null ? paper.getPlatform() : "未知"));
+        System.out.println("   URL: " + (paper.getUrl() != null ? paper.getUrl() : "未知"));
+        System.out.println();
+    }
+    
+    public void showCommandInfo(Command command) {
+        System.out.println("  " + command.getName() + " - " + command.getDescription());
+    }
+    
+    public void close() {
+        scanner.close();
+    }
+}

w10/Main.java

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+import controller.CrawlerController;
+import view.ConsoleView;
+import repository.PaperRepository;
+import strategy.StrategyFactory;
+
+public class Main {
+    public static void main(String[] args) {
+        ConsoleView view = new ConsoleView();
+        PaperRepository repository = new PaperRepository();
+        StrategyFactory strategyFactory = new StrategyFactory();
+        CrawlerController controller = new CrawlerController(view, repository, strategyFactory);
+        controller.run();
+    }
+}