diff --git a/office-plugin/src/main/java/org/artofsolving/jodconverter/util/ConfigUtils.java b/office-plugin/src/main/java/org/artofsolving/jodconverter/util/ConfigUtils.java
index f55543fb..412efc0e 100644
--- a/office-plugin/src/main/java/org/artofsolving/jodconverter/util/ConfigUtils.java
+++ b/office-plugin/src/main/java/org/artofsolving/jodconverter/util/ConfigUtils.java
@@ -20,7 +20,7 @@ public class ConfigUtils {
             userDir = userDir.substring(0, userDir.length() - 4);
         } else {
             String separator = File.separator;
-            if (userDir.contains(MAIN_DIRECTORY_NAME)) {
+            if (userDir.endsWith(MAIN_DIRECTORY_NAME)) {
                 userDir = userDir + separator + "src" + separator +  "main";
             } else {
                 userDir = userDir + separator + MAIN_DIRECTORY_NAME + separator + "src" + separator + "main";
diff --git a/server/src/main/java/cn/keking/service/impl/SimTextFilePreviewImpl.java b/server/src/main/java/cn/keking/service/impl/SimTextFilePreviewImpl.java
index 5efc2123..4d9907d2 100644
--- a/server/src/main/java/cn/keking/service/impl/SimTextFilePreviewImpl.java
+++ b/server/src/main/java/cn/keking/service/impl/SimTextFilePreviewImpl.java
@@ -12,6 +12,9 @@ import org.springframework.ui.Model;
 import org.springframework.web.util.HtmlUtils;
 
 import java.io.*;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Paths;
 
 /**
  * Created by kl on 2018/1/17.
@@ -28,16 +31,14 @@ public class SimTextFilePreviewImpl implements FilePreview {
     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();
+        String filePath = FILE_DIR + fileName;
         ReturnResponse<String> response = DownloadUtils.downLoad(fileAttribute, fileName);
         if (response.isFailure()) {
             return otherFilePreview.notSupportedFile(model, fileAttribute, response.getMsg());
         }
         try {
-            String   fileData = HtmlUtils.htmlEscape(textData(baseUrll));
+            String fileData = HtmlUtils.htmlEscape(textData(filePath));
             model.addAttribute("textData", Base64.encodeBase64String(fileData.getBytes()));
         } catch (IOException e) {
             return otherFilePreview.notSupportedFile(model, fileAttribute, e.getLocalizedMessage());
@@ -45,14 +46,16 @@ 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) {
+    private String textData(String filePath) throws IOException {
+        File file = new File(filePath);
+        if (!file.exists() || file.length() == 0) {
             return "";
-        }else {
-            String charset = EncodingDetects.getJavaEncode(baseUrll);
-            System.out.println(charset);
-            BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(baseUrll), charset));
+        } else {
+            String charset = EncodingDetects.getJavaEncode(filePath);
+            if ("ASCII".equals(charset)) {
+                charset = StandardCharsets.US_ASCII.name();
+            }
+            BufferedReader br = new BufferedReader(new InputStreamReader(Files.newInputStream(Paths.get(filePath)), charset));
             StringBuilder result = new StringBuilder();
             String line;
             while ((line = br.readLine()) != null) {
diff --git a/server/src/main/java/cn/keking/utils/EncodingDetects.java b/server/src/main/java/cn/keking/utils/EncodingDetects.java
index 10d75e90..c3b7e51b 100644
--- a/server/src/main/java/cn/keking/utils/EncodingDetects.java
+++ b/server/src/main/java/cn/keking/utils/EncodingDetects.java
@@ -402,7 +402,7 @@ class BytesEncodingDetect extends Encoding {
         int row, column;
         rawtextlen = rawtext.length;
         for (i = 0; i < rawtextlen; i++) {
-            if (rawtext[i] == '~') {
+            if (rawtext[i] == '~' && i < rawtextlen - 1) {
                 if (rawtext[i + 1] == '{') {
                     hzstart++;
                     i += 2;
@@ -4641,4 +4641,4 @@ class Encoding {
         nicename[OTHER] = "OTHER";
     }
 
-}
\ No newline at end of file
+}