diff --git a/src/main/java/tech/insight/ssexcel/config/ExcelReturnValueHandler.java b/src/main/java/tech/insight/ssexcel/config/ExcelReturnValueHandler.java
index e7406af..c70d2bb 100644
--- a/src/main/java/tech/insight/ssexcel/config/ExcelReturnValueHandler.java
+++ b/src/main/java/tech/insight/ssexcel/config/ExcelReturnValueHandler.java
@@ -17,33 +17,71 @@
  **/
 public class ExcelReturnValueHandler implements HandlerMethodReturnValueHandler {
 
+    /**
+     * 判断是否支持指定的返回值类型
+     */
     @Override
     public boolean supportsReturnType(MethodParameter returnType) {
+        // 检查条件：
+        // 1. 方法有 @SSExcel 注解
+        // 2. 返回值类型是 Collection 的子类（如 List）
         return returnType.hasMethodAnnotation(SSExcel.class) && Collection.class.isAssignableFrom(returnType.getParameterType());
     }
 
+
+    /**
+     * 处理返回值并将其转换为Excel文件进行下载
+     */
     @Override
     public void handleReturnValue(Object returnValue, MethodParameter returnType, ModelAndViewContainer mavContainer,
                                   NativeWebRequest webRequest) throws Exception {
+        // 1 获取注解信息
         SSExcel ssExcel = returnType.getMethodAnnotation(SSExcel.class);
+
+        // 2 设置 HTTP 响应头
         HttpServletResponse response = webRequest.getNativeResponse(HttpServletResponse.class);
         response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
         response.setCharacterEncoding("utf-8");
-        String template = ssExcel.excelName();
-        String excelName = analysisExcelName(template);
+
+        // 3 处理文件名
+        String template = ssExcel.excelName();  // "用户数据$date"
+        String excelName = analysisExcelName(template);  // "用户数据1703123456789"
         String fileName = URLEncoder.encode(excelName, "UTF-8").replaceAll("\\+", "%20");
         response.setHeader("Content-disposition", "attachment;filename*=utf-8''" + fileName + ".xlsx");
-        Class<?> excelType = findExcelType(returnType);
-        EasyExcel.write(response.getOutputStream(), excelType).sheet("模板").doWrite((Collection) returnValue);
+
+        // 4 解析数据类型
+        Class<?> excelType = findExcelType(returnType);  // User.class
+
+        // 5 使用 EasyExcel 生成文件
+        EasyExcel.write(response.getOutputStream(), excelType)
+                .sheet("模板")  // 设置 sheet 名称
+                .doWrite((Collection) returnValue);  // 写入数据
     }
 
+
+    /**
+     * 解析Excel文件名模板，将模板中的$date占位符替换为当前时间戳
+     *
+     * @param template Excel文件名模板字符串，其中可能包含$date占位符
+     * @return 替换后的Excel文件名，其中$date被替换为当前时间戳
+     */
     private String analysisExcelName(String template) {
+        // 将模板中的$date占位符替换为当前系统时间戳
         return template.replace("$date", System.currentTimeMillis() + "");
     }
 
 
+    /**
+     * 查找Excel数据的泛型类型
+     *
+     * @param returnType 方法参数对象，用于获取泛型类型信息
+     * @return 返回Excel数据的泛型类型Class对象
+     */
     private Class<?> findExcelType(MethodParameter returnType) {
+        // 获取泛型参数类型：List<User>
         Type genericParameterType = returnType.getGenericParameterType();
+
+        // 提取实际类型参数：User.class
         return (Class<?>) ((ParameterizedType) genericParameterType).getActualTypeArguments()[0];
     }
 
diff --git a/src/main/java/tech/insight/ssexcel/config/MvcConfiguration.java b/src/main/java/tech/insight/ssexcel/config/MvcConfiguration.java
index d84d8fc..d9d20e8 100644
--- a/src/main/java/tech/insight/ssexcel/config/MvcConfiguration.java
+++ b/src/main/java/tech/insight/ssexcel/config/MvcConfiguration.java
@@ -22,6 +22,7 @@ public class MvcConfiguration implements InitializingBean {
 
     @Override
     public void afterPropertiesSet() throws Exception {
+        // 注册自定义返回值处理器
         List<HandlerMethodReturnValueHandler> returnValueHandlers = adapter.getReturnValueHandlers();
         if (returnValueHandlers != null) {
             List<HandlerMethodReturnValueHandler> newList = new ArrayList<>(returnValueHandlers);
diff --git a/src/main/java/tech/insight/ssexcel/config/UploadConfiguration.java b/src/main/java/tech/insight/ssexcel/config/UploadConfiguration.java
index e0791b4..f84aaec 100644
--- a/src/main/java/tech/insight/ssexcel/config/UploadConfiguration.java
+++ b/src/main/java/tech/insight/ssexcel/config/UploadConfiguration.java
@@ -14,6 +14,7 @@ public class UploadConfiguration implements WebMvcConfigurer {
 
     @Override
     public void addArgumentResolvers(List<HandlerMethodArgumentResolver> resolvers) {
+        // 注册自定义参数解析器
         resolvers.add(new UploadDataHandlerMethodArgumentResolver());
     }
 }
diff --git a/src/main/java/tech/insight/ssexcel/config/UploadDataHandlerMethodArgumentResolver.java b/src/main/java/tech/insight/ssexcel/config/UploadDataHandlerMethodArgumentResolver.java
index 0a3a77f..186676a 100644
--- a/src/main/java/tech/insight/ssexcel/config/UploadDataHandlerMethodArgumentResolver.java
+++ b/src/main/java/tech/insight/ssexcel/config/UploadDataHandlerMethodArgumentResolver.java
@@ -20,22 +20,36 @@ public class UploadDataHandlerMethodArgumentResolver implements HandlerMethodArg
 
     @Override
     public boolean supportsParameter(MethodParameter parameter) {
+        // 检查条件：
+        // 1. 参数有 @ExcelData 注解
+        // 2. 方法有 @UploadExcel 注解
         return parameter.hasParameterAnnotation(ExcelData.class) && parameter.hasMethodAnnotation(UploadExcel.class);
     }
 
     @Override
-    public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer,
-                                  NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {
+    public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {
+        // 1 获取 HTTP 请求
         HttpServletRequest request = webRequest.getNativeRequest(HttpServletRequest.class);
+
+        // 2 检查是否为文件上传请求
         if (request instanceof MultipartRequest multipartRequest) {
+            // 3 获取上传的文件（参数名为 "file"）
             MultipartFile file = multipartRequest.getFile("file");
-            return EasyExcel.read(file.getInputStream(), findExcelType(parameter), null).sheet().doReadSync();
+            // 4 解析泛型类型（List<User> -> User.class）
+            Class<?> excelType = findExcelType(parameter);
+            // 5 使用 EasyExcel 解析文件
+            return EasyExcel.read(file.getInputStream(), excelType, null)
+                    .sheet()           // 读取第一个 sheet
+                    .doReadSync();     // 同步读取，返回 List<User>
         }
         return null;
     }
 
     private Class<?> findExcelType(MethodParameter parameter) {
+        // 获取泛型参数类型：List<User>
         Type genericParameterType = parameter.getGenericParameterType();
+
+        // 提取实际类型参数：User.class
         return (Class<?>) ((ParameterizedType) genericParameterType).getActualTypeArguments()[0];
     }
 
diff --git a/src/main/java/tech/insight/ssexcel/controller/ExcelController.java b/src/main/java/tech/insight/ssexcel/controller/ExcelController.java
index f0b8f38..26f207d 100644
--- a/src/main/java/tech/insight/ssexcel/controller/ExcelController.java
+++ b/src/main/java/tech/insight/ssexcel/controller/ExcelController.java
@@ -20,14 +20,22 @@
 @RequestMapping("/excel")
 public class ExcelController {
 
-    //  导出数据 下载excel
-
+    /**
+     * 提供用户数据Excel文件下载接口。
+     * 该接口通过{@link SSExcel}注解将返回的用户列表自动转换为Excel文件，
+     * 文件名格式为"用户数据"后接当前日期（如"用户数据20231015"）。
+     */
     @GetMapping("/download")
     @SSExcel(excelName = "用户数据$date")
     public List<User> download() {
         return data();
     }
 
+    /**
+     * 提供用户数据Excel文件上传接口
+     * UploadExcel注解标记该方法处理Excel上传
+     * ExcelData注解标记参数化接受解析后的数据
+     */
     @PostMapping("upload")
     @UploadExcel
     public String upload(@ExcelData List<User> objects) {