first commit

qingyun-service/src/main/java/com/qingyun/service/compare/PageFingerprinter.java

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+package com.qingyun.service.compare;
+
+import org.apache.pdfbox.pdmodel.PDDocument;
+import org.apache.pdfbox.pdmodel.PDPage;
+import org.apache.pdfbox.text.PDFTextStripper;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * 提取每页的摘要信息（指纹）
+ */
+public class PageFingerprinter {
+    public static List<String> extractPageSummaries(PDDocument document) throws IOException, IOException {
+        List<String> summaries = new ArrayList<>();
+        for (int i = 0; i < document.getNumberOfPages(); i++) {
+            PDPage page = document.getPage(i);
+            PDFTextStripper stripper = new PDFTextStripper();
+            stripper.setStartPage(i + 1);
+            stripper.setEndPage(i + 1);
+            String text = stripper.getText(document);
+            // 去掉回车符、空格、换行符、换页符、缩进符、'\r'
+            text = text.replaceAll("\\s+", "");
+            // 取前 100 字作为指纹（可根据需要扩展）
+            //String summary = text.length() > 500 ? text.substring(0, 500) : text;
+            summaries.add(text);
+        }
+        return summaries;
+    }
+}