java/project/DataCleaner.java

import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class DataCleaner {
    
    public static List<PostInfo> cleanPosts(List<PostInfo> rawPosts) {
        List<PostInfo> cleanedPosts = new ArrayList<>();
        
        for (PostInfo post : rawPosts) {
            PostInfo cleaned = cleanPost(post);
            if (isValidPost(cleaned)) {
                cleanedPosts.add(cleaned);
            }
        }
        
        System.out.println("数据清洗完成，有效数据: " + cleanedPosts.size() + " 条");
        return cleanedPosts;
    }
    
    private static PostInfo cleanPost(PostInfo post) {
        PostInfo cleaned = new PostInfo();
        
        cleaned.setTitle(cleanText(post.getTitle()));
        cleaned.setContent(cleanContent(post.getContent()));
        cleaned.setAuthor(cleanText(post.getAuthor()));
        cleaned.setPostDate(post.getPostDate());
        cleaned.setLikeCount(post.getLikeCount());
        cleaned.setCommentCount(post.getCommentCount());
        cleaned.setViewCount(post.getViewCount());
        cleaned.setTags(cleanText(post.getTags()));
        cleaned.setSentiment(normalizeSentiment(post.getSentiment()));
        
        return cleaned;
    }
    
    private static String cleanText(String text) {
        if (text == null) {
            return "";
        }
        return text.trim().replaceAll("\\s+", " ");
    }
    
    private static String cleanContent(String content) {
        if (content == null) {
            return "";
        }
        return content.trim()
                .replaceAll("\\s+", " ")
                .replaceAll("[\\r\\n]+", " ")
                .replaceAll("<[^>]+>", "")
                .replaceAll("\\[.*?\\]", "")
                .replaceAll("\\(.*?\\)", "");
    }
    
    private static String normalizeSentiment(String sentiment) {
        if (sentiment == null || sentiment.isEmpty()) {
            return "中性";
        }
        
        String lower = sentiment.toLowerCase();
        if (lower.contains("积极") || lower.contains("正面") || lower.contains("positive")) {
            return "积极";
        } else if (lower.contains("消极") || lower.contains("负面") || lower.contains("negative")) {
            return "消极";
        } else {
            return "中性";
        }
    }
    
    private static boolean isValidPost(PostInfo post) {
        return post.getTitle() != null && !post.getTitle().isEmpty() &&
               post.getContent() != null && !post.getContent().isEmpty();
    }
    
    public static String[] extractKeywords(String content) {
        if (content == null || content.isEmpty()) {
            return new String[0];
        }
        
        String[] commonKeywords = {
            "数据", "分析", "学习", "技术", "互联网", "发展", "趋势",
            "工具", "方法", "实践", "经验", "案例", "应用", "创新",
            "挑战", "机遇", "未来", "智能", "算法", "模型", "平台"
        };
        
        List<String> keywords = new ArrayList<>();
        String lowerContent = content.toLowerCase();
        
        for (String keyword : commonKeywords) {
            if (lowerContent.contains(keyword.toLowerCase())) {
                keywords.add(keyword);
            }
        }
        
        return keywords.toArray(new String[0]);
    }
}