diff --git a/base/src/main/java/com/tinyengine/it/common/utils/ImageThumbnailGenerator.java b/base/src/main/java/com/tinyengine/it/common/utils/ImageThumbnailGenerator.java
index ab8adad9..12724f3b 100644
--- a/base/src/main/java/com/tinyengine/it/common/utils/ImageThumbnailGenerator.java
+++ b/base/src/main/java/com/tinyengine/it/common/utils/ImageThumbnailGenerator.java
@@ -33,6 +33,7 @@
 import java.nio.charset.StandardCharsets;
 import java.util.Base64;
 import java.util.HashMap;
+import java.util.Locale;
 import java.util.Map;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
@@ -149,7 +150,7 @@ private static ImageInputInfo parseImageInput(String imageInput) {
         // 检查是否为数据URI格式
         Matcher matcher = DATA_URI_PATTERN.matcher(trimmed);
         if (matcher.matches()) {
-            String mimeType = matcher.group(1).toLowerCase();
+            String mimeType = matcher.group(1).toLowerCase(Locale.ROOT);
             String cleanBase64 = matcher.group(2);
             String format = mimeTypeToFormat(mimeType);
 
@@ -173,7 +174,7 @@ public static String detectFormatFromBase64(String base64Input) {
 
             // 先检查是否为SVG
             String content = new String(imageBytes, 0, Math.min(1000, imageBytes.length),
-                StandardCharsets.UTF_8).trim().toLowerCase();
+                StandardCharsets.UTF_8).trim().toLowerCase(Locale.ROOT);
             if (content.contains("<svg") || (content.startsWith("<?xml") && content.contains("<svg"))) {
                 return FORMAT_SVG;
             }
@@ -253,7 +254,7 @@ public static boolean validateByImageIO(MultipartFile file) {
                 return false;
             }
             // 获取文件扩展名
-            String extension = getFileExtension(filename).toLowerCase();
+            String extension = getFileExtension(filename).toLowerCase(Locale.ROOT);
 
             if ("svg".equals(extension)) {
                 return isSvgFile(file);
@@ -301,7 +302,7 @@ public static String convertToBase64(MultipartFile file) throws IOException {
         String base64 = Base64.getEncoder().encodeToString(fileBytes);
         // 如果是SVG文件，修正MIME类型
         String filename = file.getOriginalFilename();
-        if (filename != null && filename.toLowerCase().endsWith(".svg")) {
+        if (filename != null && filename.toLowerCase(Locale.ROOT).endsWith(".svg")) {
             mimeType = "image/svg+xml";
         }
         return "data:" + mimeType + ";base64," + base64;
@@ -315,7 +316,7 @@ private static String mimeTypeToFormat(String mimeType) {
             return FORMAT_JPG;
         }
 
-        switch (mimeType.toLowerCase()) {
+        switch (mimeType.toLowerCase(Locale.ROOT)) {
             case "jpeg":
             case "jpg":
                 return FORMAT_JPG;
@@ -337,7 +338,7 @@ private static String mimeTypeToFormat(String mimeType) {
      * 格式转MIME类型
      */
     private static String formatToMimeType(String format) {
-        return MIME_TYPES.getOrDefault(format.toLowerCase(), "image/jpeg");
+        return MIME_TYPES.getOrDefault(format.toLowerCase(Locale.ROOT), "image/jpeg");
     }
 
     /**
@@ -389,7 +390,7 @@ private static String createSVGThumbnail(String base64SVG, int maxWidth, int max
      * 创建合适的图片转换器
      */
     private static ImageTranscoder createTranscoder(String format) {
-        switch (format.toLowerCase()) {
+        switch (format.toLowerCase(Locale.ROOT)) {
             case FORMAT_JPG:
             case FORMAT_JPEG:
                 JPEGTranscoder jpegTranscoder = new JPEGTranscoder();
@@ -504,7 +505,7 @@ private static void validateParameters(int maxWidth, int maxHeight) {
     private static void validateParameters(int maxWidth, int maxHeight, String format) {
         validateParameters(maxWidth, maxHeight);
 
-        if (format == null || !MIME_TYPES.containsKey(format.toLowerCase())) {
+        if (format == null || !MIME_TYPES.containsKey(format.toLowerCase(Locale.ROOT))) {
             throw new IllegalArgumentException("Unsupported output format: " + format + "，Supported formats: " + MIME_TYPES.keySet());
         }
     }
diff --git a/base/src/main/java/com/tinyengine/it/controller/AiChatController.java b/base/src/main/java/com/tinyengine/it/controller/AiChatController.java
index 29d124ac..2b6eb3e9 100644
--- a/base/src/main/java/com/tinyengine/it/controller/AiChatController.java
+++ b/base/src/main/java/com/tinyengine/it/controller/AiChatController.java
@@ -35,8 +35,6 @@
 import org.springframework.web.bind.annotation.RestController;
 import org.springframework.web.servlet.mvc.method.annotation.StreamingResponseBody;
 
-import java.util.List;
-
 /**
  * The type Ai chat controller.
  *
diff --git a/base/src/main/java/com/tinyengine/it/controller/ResourceController.java b/base/src/main/java/com/tinyengine/it/controller/ResourceController.java
index 5c821638..d888ebce 100644
--- a/base/src/main/java/com/tinyengine/it/controller/ResourceController.java
+++ b/base/src/main/java/com/tinyengine/it/controller/ResourceController.java
@@ -192,10 +192,10 @@ public Result<Resource> resourceUpload(@RequestParam MultipartFile file) throws
         // 获取文件的原始名称
         String fileName = StringUtils.cleanPath(java.util.Optional.ofNullable(file.getOriginalFilename()).orElse("image"));
 
-        if(!ImageThumbnailGenerator.validateByImageIO(file)){
+        if (!ImageThumbnailGenerator.validateByImageIO(file)) {
             return Result.failed(ExceptionEnum.CM325);
         }
-        if(fileName.contains("..")) {
+        if (fileName.contains("..")) {
             return Result.failed(ExceptionEnum.CM325);
         }
         // 将文件转为 Base64
diff --git a/base/src/main/java/com/tinyengine/it/controller/VectorStorageController.java b/base/src/main/java/com/tinyengine/it/controller/VectorStorageController.java
index ee57e43b..0d56f894 100644
--- a/base/src/main/java/com/tinyengine/it/controller/VectorStorageController.java
+++ b/base/src/main/java/com/tinyengine/it/controller/VectorStorageController.java
@@ -221,7 +221,7 @@ public Result<DeleteResult> deleteByFilePath(@RequestParam String filePath, @Req
     @DeleteMapping("/vector-storage/batch/{collection}")
     public Result<BatchDeleteResult> deleteMultipleFiles(@PathVariable String collection,
         @RequestBody @NotEmpty List<@NotEmpty String> filePaths) {
-        BatchDeleteResult result = vectorStorageService.deleteMultipleFiles(filePaths,collection);
+        BatchDeleteResult result = vectorStorageService.deleteMultipleFiles(filePaths, collection);
         return Result.success(result);
     }
 
diff --git a/base/src/main/java/com/tinyengine/it/mapper/ResourceGroupResourceMapper.java b/base/src/main/java/com/tinyengine/it/mapper/ResourceGroupResourceMapper.java
index d563c5a9..f8a77ad2 100644
--- a/base/src/main/java/com/tinyengine/it/mapper/ResourceGroupResourceMapper.java
+++ b/base/src/main/java/com/tinyengine/it/mapper/ResourceGroupResourceMapper.java
@@ -14,7 +14,6 @@
 
 import com.baomidou.mybatisplus.core.mapper.BaseMapper;
 import com.tinyengine.it.model.entity.ResourceGroupResource;
-import org.apache.ibatis.annotations.Delete;
 import org.apache.ibatis.annotations.Select;
 
 import java.util.List;
diff --git a/base/src/main/java/com/tinyengine/it/rag/entity/EmbeddingMatchDto.java b/base/src/main/java/com/tinyengine/it/rag/entity/EmbeddingMatchDto.java
index 473ab6d9..5ccadc97 100644
--- a/base/src/main/java/com/tinyengine/it/rag/entity/EmbeddingMatchDto.java
+++ b/base/src/main/java/com/tinyengine/it/rag/entity/EmbeddingMatchDto.java
@@ -83,9 +83,15 @@ public static EmbeddingMatchDto from(EmbeddingMatch<TextSegment> match) {
                 dto.setSource(source);
 
                 // 将常用字段也放入 metadata map
-                if (collection != null) metadataMap.put("collection", collection);
-                if (documentSetId != null) metadataMap.put("documentSetId", documentSetId);
-                if (source != null) metadataMap.put("source", source);
+                if (collection != null) {
+                    metadataMap.put("collection", collection);
+                }
+                if (documentSetId != null) {
+                    metadataMap.put("documentSetId", documentSetId);
+                }
+                if (source != null) {
+                    metadataMap.put("source", source);
+                }
 
                 dto.setMetadata(metadataMap);
             } else {
diff --git a/base/src/main/java/com/tinyengine/it/rag/entity/VectorDocument.java b/base/src/main/java/com/tinyengine/it/rag/entity/VectorDocument.java
index e44c018a..1096ef11 100644
--- a/base/src/main/java/com/tinyengine/it/rag/entity/VectorDocument.java
+++ b/base/src/main/java/com/tinyengine/it/rag/entity/VectorDocument.java
@@ -75,6 +75,7 @@ public VectorDocument(int successCount, int errorCount, String documentSetId, St
         this.processingTime = 0L;
         this.status = errorCount == 0 ? "SUCCESS" : "PARTIAL_SUCCESS";
     }
+
     /**
      * 获取总处理数量
      */
diff --git a/base/src/main/java/com/tinyengine/it/rag/service/StorageService.java b/base/src/main/java/com/tinyengine/it/rag/service/StorageService.java
index 818b9abf..acdb725e 100644
--- a/base/src/main/java/com/tinyengine/it/rag/service/StorageService.java
+++ b/base/src/main/java/com/tinyengine/it/rag/service/StorageService.java
@@ -43,9 +43,11 @@
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 import java.util.Objects;
 import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
 /**
  * 存储服务 - 支持动态集合管理
@@ -92,7 +94,7 @@ public class StorageService {
      * Check if file format is supported
      */
     private boolean isSupportedFormat(Path filePath) {
-        String fileName = filePath.getFileName().toString().toLowerCase();
+        String fileName = filePath.getFileName().toString().toLowerCase(Locale.ROOT);
         return SUPPORTED_FORMATS.stream().anyMatch(format -> fileName.endsWith(format));
     }
 
@@ -166,30 +168,25 @@ public VectorDocument autoAddFolderToKnowledgeBase() {
      * 扫描文件夹中所有支持的文件
      */
     private List<String> scanSupportedFiles(String folderPath) {
-        List<String> supportedFiles = new ArrayList<>();
-
-        try {
-            Path folder = Paths.get(folderPath);
-            // 使用 Files.walk 递归扫描子文件夹
-            Files.walk(folder)
-                .filter(Files::isRegularFile)
-                .filter(this::isSupportedFormat)
-                .forEach(filePath -> {
-                    supportedFiles.add(filePath.toString());
-                    log.debug("Found supported file: {}", filePath);
-                });
-
-            supportedFiles.sort(String::compareTo);
+        Path folder = Paths.get(folderPath);
+
+        try (Stream<Path> pathStream = Files.walk(folder)) {
+            return pathStream
+                    .filter(Files::isRegularFile)
+                    .filter(this::isSupportedFormat)
+                    .peek(filePath -> log.debug("Found supported file: {}", filePath))
+                    .map(Path::toString)
+                    .sorted()
+                    .collect(Collectors.toList());
 
         } catch (IOException e) {
             log.error("Failed to scan folder: {}", folderPath, e);
             throw new ServiceException(ExceptionEnum.CM333.getResultCode(), ExceptionEnum.CM333.getResultMsg());
         }
-
-        return supportedFiles;
     }
 
 
+
     /**
      * 根据文档路径和自定义集合确定目标集合
      */
@@ -205,7 +202,7 @@ private String determineCollectionName(String filePath, String customCollection)
 
         // 根据文件路径自动判断集合
         if (filePath != null) {
-            String lowerPath = filePath.toLowerCase();
+            String lowerPath = filePath.toLowerCase(Locale.ROOT);
             // 如果路径包含特定关键词，映射到对应集合
             for (Map.Entry<String, String> entry : collectionMapping.entrySet()) {
                 if (lowerPath.contains(entry.getKey())) {
@@ -223,9 +220,11 @@ private String determineCollectionName(String filePath, String customCollection)
      * 检查文件格式是否支持
      */
     private boolean isSupportedFormat(String filePath) {
-        if (filePath == null) return false;
+        if (filePath == null) {
+            return false;
+        }
 
-        String lowerPath = filePath.toLowerCase();
+        String lowerPath = filePath.toLowerCase(Locale.ROOT);
         return SUPPORTED_FORMATS.stream().anyMatch(lowerPath::endsWith);
     }
 
@@ -233,9 +232,11 @@ private boolean isSupportedFormat(String filePath) {
      * 检查是否为文本格式
      */
     private boolean isTextFormat(String filePath) {
-        if (filePath == null) return false;
+        if (filePath == null) {
+            return false;
+        }
 
-        String lowerPath = filePath.toLowerCase();
+        String lowerPath = filePath.toLowerCase(Locale.ROOT);
         return TEXT_FORMATS.stream().anyMatch(lowerPath::endsWith);
     }
 
@@ -243,27 +244,65 @@ private boolean isTextFormat(String filePath) {
      * 获取文件格式描述
      */
     private String getFileFormatDescription(String filePath) {
-        if (filePath == null) return "unknown";
-
-        String lowerPath = filePath.toLowerCase();
-        if (lowerPath.endsWith(".pdf")) return "PDF Document";
-        if (lowerPath.endsWith(".sql")) return "SQL Script";
-        if (lowerPath.endsWith(".java")) return "Java Source";
-        if (lowerPath.endsWith(".py")) return "Python Script";
-        if (lowerPath.endsWith(".js")) return "JavaScript";
-        if (lowerPath.endsWith(".ts")) return "TypeScript";
-        if (lowerPath.endsWith(".html")) return "HTML Document";
-        if (lowerPath.endsWith(".css")) return "CSS Stylesheet";
-        if (lowerPath.endsWith(".xml")) return "XML Document";
-        if (lowerPath.endsWith(".json")) return "JSON Data";
-        if (lowerPath.endsWith(".yaml") || lowerPath.endsWith(".yml")) return "YAML Configuration";
-        if (lowerPath.endsWith(".properties")) return "Properties File";
-        if (lowerPath.endsWith(".sh")) return "Shell Script";
-        if (lowerPath.endsWith(".bat") || lowerPath.endsWith(".cmd")) return "Batch File";
-        if (lowerPath.endsWith(".c")) return "C Source";
-        if (lowerPath.endsWith(".cpp") || lowerPath.endsWith(".h") || lowerPath.endsWith(".hpp")) return "C++ Source";
-        if (lowerPath.endsWith(".txt")) return "Text Document";
-        if (lowerPath.endsWith(".md")) return "Markdown Document";
+        if (filePath == null) {
+            return "unknown";
+        }
+
+        String lowerPath = filePath.toLowerCase(Locale.ROOT);
+        if (lowerPath.endsWith(".pdf")) {
+            return "PDF Document";
+        }
+        if (lowerPath.endsWith(".sql")) {
+            return "SQL Script";
+        }
+        if (lowerPath.endsWith(".java")) {
+            return "Java Source";
+        }
+        if (lowerPath.endsWith(".py")) {
+            return "Python Script";
+        }
+        if (lowerPath.endsWith(".js")) {
+            return "JavaScript";
+        }
+        if (lowerPath.endsWith(".ts")) {
+            return "TypeScript";
+        }
+        if (lowerPath.endsWith(".html")) {
+            return "HTML Document";
+        }
+        if (lowerPath.endsWith(".css")) {
+            return "CSS Stylesheet";
+        }
+        if (lowerPath.endsWith(".xml")) {
+            return "XML Document";
+        }
+        if (lowerPath.endsWith(".json")) {
+            return "JSON Data";
+        }
+        if (lowerPath.endsWith(".yaml") || lowerPath.endsWith(".yml")) {
+            return "YAML Configuration";
+        }
+        if (lowerPath.endsWith(".properties")) {
+            return "Properties File";
+        }
+        if (lowerPath.endsWith(".sh")) {
+            return "Shell Script";
+        }
+        if (lowerPath.endsWith(".bat") || lowerPath.endsWith(".cmd")) {
+            return "Batch File";
+        }
+        if (lowerPath.endsWith(".c")) {
+            return "C Source";
+        }
+        if (lowerPath.endsWith(".cpp") || lowerPath.endsWith(".h") || lowerPath.endsWith(".hpp")) {
+            return "C++ Source";
+        }
+        if (lowerPath.endsWith(".txt")) {
+            return "Text Document";
+        }
+        if (lowerPath.endsWith(".md")) {
+            return "Markdown Document";
+        }
 
         return "Unknown Format";
     }
@@ -339,7 +378,7 @@ private List<Document> loadDocuments(List<String> documentPaths, String document
                 Path filePath = Paths.get(path);
                 Document document;
 
-                if (path.toLowerCase().endsWith(".pdf")) {
+                if (path.toLowerCase(Locale.ROOT).endsWith(".pdf")) {
                     // PDF 文件使用 PDF 解析器
                     ApachePdfBoxDocumentParser pdfParser = new ApachePdfBoxDocumentParser();
                     document = FileSystemDocumentLoader.loadDocument(filePath, pdfParser);
@@ -666,6 +705,7 @@ public BatchDeleteResult deleteMultipleFiles(List<String> filePaths, String coll
             throw new ServiceException(ExceptionEnum.CM332.getResultCode(), "Batch delete files failed");
         }
     }
+
     /**
      * 获取所有集合及其包含的文档路径
      */
diff --git a/base/src/main/java/com/tinyengine/it/service/app/impl/v1/AiChatV1ServiceImpl.java b/base/src/main/java/com/tinyengine/it/service/app/impl/v1/AiChatV1ServiceImpl.java
index df546898..5e9c0574 100644
--- a/base/src/main/java/com/tinyengine/it/service/app/impl/v1/AiChatV1ServiceImpl.java
+++ b/base/src/main/java/com/tinyengine/it/service/app/impl/v1/AiChatV1ServiceImpl.java
@@ -88,7 +88,7 @@ private String normalizeApiUrl(String baseUrl) {
 
         if (baseUrl.contains("v1")) {
             return ensureUrlProtocol(baseUrl) + "/chat/completions";
-        } else  {
+        } else {
             return ensureUrlProtocol(baseUrl) + "/v1/chat/completions";
         }
     }
@@ -114,40 +114,40 @@ private String buildRequestBody(ChatRequest request) {
             body.put("max_tokens", request.getMaxTokens());
         }
         body.put("temperature", request.getTemperature());
-        if(request.getTemperature() != null) {
+        if (request.getTemperature() != null) {
             body.put("temperature", request.getTemperature());
         }
-        if(request.getSearchOptions() != null) {
+        if (request.getSearchOptions() != null) {
             body.put("stream_options", request.getSearchOptions());
         }
-        if(request.getPresencePenalty() != null) {
+        if (request.getPresencePenalty() != null) {
             body.put("presence_penalty", request.getPresencePenalty());
         }
-        if(request.getResponseFormat() != null) {
+        if (request.getResponseFormat() != null) {
             body.put("response_format", request.getResponseFormat());
         }
-        if(request.getMaxInputTokens() != null) {
+        if (request.getMaxInputTokens() != null) {
             body.put("max_input_tokens", request.getMaxInputTokens());
         }
-        if(request.getMaxInputTokens() != null) {
+        if (request.getMaxInputTokens() != null) {
             body.put("vl_high_resolution_images", request.getVlHighResolutionImages());
         }
-        if(request.getEnableThinking() != null) {
+        if (request.getEnableThinking() != null) {
             body.put("enable_thinking", request.getEnableThinking());
         }
-        if(request.getToolChoice() != null) {
+        if (request.getToolChoice() != null) {
             body.put("tool_choice", request.getToolChoice());
         }
-        if(request.getStop() != null) {
+        if (request.getStop() != null) {
             body.put("stop", request.getStop());
         }
-        if(request.getParallelToolCalls() != null) {
+        if (request.getParallelToolCalls() != null) {
             body.put("parallel_tool_calls", request.getParallelToolCalls());
         }
-        if(request.getEnableSearch() != null) {
+        if (request.getEnableSearch() != null) {
             body.put("enable_search", request.getEnableSearch());
         }
-        if(request.getFrequencyPenalty() != null) {
+        if (request.getFrequencyPenalty() != null) {
             body.put("frequency_penalty", request.getFrequencyPenalty());
         }
 
@@ -186,8 +186,9 @@ private StreamingResponseBody processStreamResponse(HttpRequest.Builder requestB
                     String errorEvent = "data: {\"error\": \"" + e.getMessage() + "\"}\n\n";
                     outputStream.write(errorEvent.getBytes(StandardCharsets.UTF_8));
                     outputStream.flush();
-                } catch (IOException ignored) {
-
+                } catch (IOException ioException) {
+                    throw new IOException("API请求失败，且无法发送错误信息: " + e.getMessage() +
+                            " (IO错误: " + ioException.getMessage() + ")", e);
                 }
             }
         };
diff --git a/base/src/main/java/com/tinyengine/it/service/material/impl/BlockServiceImpl.java b/base/src/main/java/com/tinyengine/it/service/material/impl/BlockServiceImpl.java
index 24161939..e22361ee 100644
--- a/base/src/main/java/com/tinyengine/it/service/material/impl/BlockServiceImpl.java
+++ b/base/src/main/java/com/tinyengine/it/service/material/impl/BlockServiceImpl.java
@@ -606,13 +606,13 @@ public IPage<Block> findBlocksByConditionPagetion(Map<String, String> request) {
     public List<User> getUsers(List<Block> blocksList) {
         Set<String> userSet = new HashSet<>();
         List<User> users = new ArrayList<>();
-        if(blocksList.isEmpty()) {
+        if (blocksList.isEmpty()) {
             return users;
         }
         // 提取 createdBy 列表中的唯一值
         blocksList.forEach(item -> {
             if (item.getCreatedBy() != null && !userSet.contains(item.getCreatedBy())) {
-                userSet.add(String.valueOf(item.getCreatedBy()));
+                userSet.add(item.getCreatedBy());
             }
         });
 
diff --git a/base/src/test/java/com/tinyengine/it/controller/AiChatControllerTest.java b/base/src/test/java/com/tinyengine/it/controller/AiChatControllerTest.java
index fde49572..a0cd9755 100644
--- a/base/src/test/java/com/tinyengine/it/controller/AiChatControllerTest.java
+++ b/base/src/test/java/com/tinyengine/it/controller/AiChatControllerTest.java
@@ -12,23 +12,9 @@
 
 package com.tinyengine.it.controller;
 
-import static org.mockito.Mockito.when;
-
-import com.tinyengine.it.common.base.Result;
-import com.tinyengine.it.model.dto.AiParam;
-import com.tinyengine.it.model.dto.ChatRequest;
-import com.tinyengine.it.service.app.AiChatService;
-
-import org.junit.jupiter.api.Assertions;
 import org.junit.jupiter.api.BeforeEach;
-import org.junit.jupiter.api.Test;
-import org.mockito.InjectMocks;
-import org.mockito.Mock;
 import org.mockito.MockitoAnnotations;
 
-import java.util.HashMap;
-import java.util.Map;
-
 /**
  * test case
  *