补充Excel文档加载类

ruoyi-modules-api/ruoyi-knowledge-api/src/main/java/org/ruoyi/chain/loader/ExcelFileLoader.java

@@ -0,0 +1,41 @@
+package org.ruoyi.chain.loader;
+
+import dev.langchain4j.data.document.Document;
+import dev.langchain4j.data.document.parser.apache.tika.ApacheTikaDocumentParser;
+import lombok.AllArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
+import org.ruoyi.chain.split.TextSplitter;
+import org.ruoyi.common.core.exception.UtilException;
+import org.springframework.stereotype.Component;
+
+import java.io.BufferedInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.util.List;
+@Component
+@AllArgsConstructor
+@Slf4j
+public class ExcelFileLoader implements ResourceLoader {
+    private final TextSplitter textSplitter;
+    private static final int DEFAULT_BUFFER_SIZE = 8192;
+    @Override
+    public String getContent(InputStream inputStream) {
+        // 使用带缓冲的输入流包装（保持原流不自动关闭）
+        try (InputStream bufferedStream = new BufferedInputStream(inputStream, DEFAULT_BUFFER_SIZE)) {
+            ApacheTikaDocumentParser apacheTikaDocumentParser = new ApacheTikaDocumentParser();
+            Document document = apacheTikaDocumentParser.parse(bufferedStream);
+            return document.text();
+        } catch (IOException e) {
+            String errorMsg = "Excel文件流读取失败";
+            throw new UtilException(errorMsg, e);
+        } catch (RuntimeException e) {
+            String errorMsg = "Excel内容解析异常";
+            throw new UtilException(errorMsg, e);
+        }
+    }
+
+    @Override
+    public List<String> getChunkList(String content, String kid) {
+        return textSplitter.split(content, kid);
+    }
+}