feat: HTTP状态码 + 业务码

src/main/java/com/webgame/webgamebackend/common/handler/GlobalExceptionHandler.java

@@ -4,11 +4,14 @@ import cn.dev33.satoken.exception.NotLoginException;
 import cn.dev33.satoken.exception.NotPermissionException;
 import cn.dev33.satoken.exception.NotRoleException;
 import cn.dev33.satoken.exception.SaTokenContextException;
+import com.alibaba.fastjson2.JSON;
 import com.webgame.webgamebackend.common.dto.ApiResponse;
 import com.webgame.webgamebackend.common.exception.BusinessException;
 import com.webgame.webgamebackend.common.exception.ErrorCode;
+import jakarta.servlet.http.HttpServletResponse;
 import lombok.extern.slf4j.Slf4j;
 import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
 import org.springframework.http.ResponseEntity;
 import org.springframework.http.converter.HttpMessageNotReadableException;
 import org.springframework.web.HttpRequestMethodNotSupportedException;
@@ -21,9 +24,14 @@ import org.springframework.web.method.annotation.MethodArgumentTypeMismatchExcep
 import org.springframework.web.multipart.MaxUploadSizeExceededException;
 import org.springframework.web.servlet.resource.NoResourceFoundException;
 
+import java.io.IOException;
+
 /**
- * 全局异常处理器，返回 ResponseEntity<ApiResponse> 实现双层错误表达：
+ * 全局异常处理器，双层错误表达：
  * HTTP 状态码表达错误大类 + ApiResponse.code 表达具体业务错误码
+ * <p>
+ * 业务异常（仅来自 REST JSON 请求）返回 ResponseEntity，经过 Spring 内容协商。
+ * 框架级异常（可能来自 SSE/浏览器等任意请求类型）直接写 HttpServletResponse 绕过内容协商。
  */
 @Slf4j
 @RestControllerAdvice
@@ -47,7 +55,7 @@ public class GlobalExceptionHandler {
         // SSE 响应已被客户端关闭，不写响应体
     }
 
-    // ==================== 业务异常 ====================
+    // ==================== 业务异常（REST JSON 请求） ====================
 
     /**
      * 业务异常 — HTTP 状态码从 ErrorCode 枚举自动派生
@@ -115,31 +123,46 @@ public class GlobalExceptionHandler {
                 .body(ApiResponse.fail(403, "权限不足"));
     }
 
-    // ==================== 框架级异常 ====================
+    // ==================== 框架级异常（直接写响应，绕过内容协商） ====================
+    // 这类异常可能来自任意请求类型（SSE Accept: text/event-stream、
+    // 浏览器 Accept: text/html 等），若走 ResponseEntity 会因 Accept 头
+    // 与 JSON 响应体不匹配而抛出 HttpMediaTypeNotAcceptableException。
 
     @ExceptionHandler(NoResourceFoundException.class)
-    public ResponseEntity<ApiResponse<Void>> handleNoResourceFound(NoResourceFoundException ex) {
+    public void handleNoResourceFound(NoResourceFoundException ex, HttpServletResponse response) throws IOException {
         log.warn("资源未找到: {}", ex.getMessage());
-        return ResponseEntity
-                .status(HttpStatus.NOT_FOUND)
-                .body(ApiResponse.fail(404, "资源未找到"));
+        writeJsonError(response, HttpStatus.NOT_FOUND, 404, "资源未找到");
     }
 
     @ExceptionHandler(HttpRequestMethodNotSupportedException.class)
-    public ResponseEntity<ApiResponse<Void>> handleMethodNotSupported(HttpRequestMethodNotSupportedException ex) {
+    public void handleMethodNotSupported(HttpRequestMethodNotSupportedException ex,
+                                         HttpServletResponse response) throws IOException {
         log.warn("请求方法不支持: {}", ex.getMessage());
-        return ResponseEntity
-                .status(HttpStatus.METHOD_NOT_ALLOWED)
-                .body(ApiResponse.fail(405, "请求方法不支持"));
+        writeJsonError(response, HttpStatus.METHOD_NOT_ALLOWED, 405, "请求方法不支持");
     }
 
-    // ==================== 兜底 → HTTP 500 ====================
+    // ==================== 兜底 → HTTP 500（直接写响应，绕过内容协商） ====================
 
     @ExceptionHandler(Exception.class)
-    public ResponseEntity<ApiResponse<Void>> handleException(Exception ex) {
+    public void handleException(Exception ex, HttpServletResponse response) throws IOException {
         log.error("服务器内部错误", ex);
-        return ResponseEntity
-                .status(HttpStatus.INTERNAL_SERVER_ERROR)
-                .body(ApiResponse.fail(ErrorCode.INTERNAL_ERROR.getCode(), ErrorCode.INTERNAL_ERROR.getDefaultMessage()));
+        writeJsonError(response, HttpStatus.INTERNAL_SERVER_ERROR,
+                ErrorCode.INTERNAL_ERROR.getCode(), ErrorCode.INTERNAL_ERROR.getDefaultMessage());
+    }
+
+    // ==================== 工具方法 ====================
+
+    /**
+     * 直接向 HttpServletResponse 写入 JSON 格式的错误响应
+     * <p>
+     * 不依赖 Spring 的 MessageConverter 和内容协商机制，
+     * 确保 SSE/浏览器等非 JSON Accept 头的请求也能收到可读的错误信息。
+     */
+    private static void writeJsonError(HttpServletResponse response, HttpStatus status,
+                                       int code, String message) throws IOException {
+        response.setStatus(status.value());
+        response.setContentType(MediaType.APPLICATION_JSON_VALUE);
+        response.setCharacterEncoding("UTF-8");
+        response.getWriter().write(JSON.toJSONString(ApiResponse.fail(code, message)));
     }
 }

src/main/java/com/webgame/webgamebackend/sse/SseController.java

@@ -71,8 +71,6 @@ public class SseController {
                     lastEventId, userId, connectionId);
         }
 
-        log.info("[SSE] 连接建立成功, userId={}, connectionId={}, onlineConnections={}",
-                userId, connectionId, connectionManager.getOnlineCount());
         return emitter;
     }