修复某些情况下txt文本乱码问题

server/src/main/java/cn/keking/service/impl/SimTextFilePreviewImpl.java

 package cn.keking.service.impl;
 
+import cn.keking.config.ConfigConstants;
 import cn.keking.model.FileAttribute;
 import cn.keking.model.ReturnResponse;
 import cn.keking.service.FilePreview;
@@ -11,8 +12,7 @@ import org.springframework.stereotype.Service;
 import org.springframework.ui.Model;
 import org.springframework.web.util.HtmlUtils;
 
-import java.io.File;
-import java.io.IOException;
+import java.io.*;
 import java.nio.charset.StandardCharsets;
 
 /**
@@ -27,19 +27,19 @@ public class SimTextFilePreviewImpl implements FilePreview {
     public SimTextFilePreviewImpl(OtherFilePreviewImpl otherFilePreview) {
         this.otherFilePreview = otherFilePreview;
     }
-
+    private static final String FILE_DIR = ConfigConstants.getFileDir();
     @Override
     public String filePreviewHandle(String url, Model model, FileAttribute fileAttribute) {
+
         String fileName = fileAttribute.getName();
+        String baseUrll = FILE_DIR + fileName;
+      //  String suffix = fileAttribute.getSuffix();
         ReturnResponse<String> response = DownloadUtils.downLoad(fileAttribute, fileName);
         if (response.isFailure()) {
             return otherFilePreview.notSupportedFile(model, fileAttribute, response.getMsg());
         }
         try {
-            File originFile = new File(response.getContent());
-            String charset = KkFileUtils.getFileEncode(originFile);
-            String fileData = FileUtil.readString(originFile, charset);
-            fileData = HtmlUtils.htmlEscape(fileData, StandardCharsets.UTF_8.name());
+            String   fileData = HtmlUtils.htmlEscape(textData(baseUrll));
             model.addAttribute("textData", Base64.encodeBase64String(fileData.getBytes()));
         } catch (IOException e) {
             return otherFilePreview.notSupportedFile(model, fileAttribute, e.getLocalizedMessage());
@@ -47,4 +47,23 @@ public class SimTextFilePreviewImpl implements FilePreview {
         return TXT_FILE_PREVIEW_PAGE;
     }
 
+    private String textData(String baseUrll) throws IOException {
+        File file = new File(baseUrll);
+        if(!file.exists() || file.length() == 0) {
+            String line="";
+            return line;
+        }else {
+            String charset = EncodingDetects.getJavaEncode(baseUrll);
+            System.out.println(charset);
+            BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(baseUrll), charset));
+            StringBuilder result = new StringBuilder();
+            String line;
+            while ((line = br.readLine()) != null) {
+                result.append(line).append("\r\n");
+            }
+            return result.toString();
+        }
+    }
+
+
 }