fix:导出为页面下载

src/main/java/com/ai/da/controller/GlobalAwardController.java

@@ -11,6 +11,7 @@ import io.swagger.annotations.Api;
 import io.swagger.annotations.ApiOperation;
 import io.swagger.annotations.ApiParam;
 import jakarta.annotation.Resource;
+import jakarta.servlet.http.HttpServletResponse;
 import org.springframework.web.bind.annotation.*;
 import org.springframework.web.multipart.MultipartFile;
 
@@ -165,10 +166,13 @@ public class GlobalAwardController {
 
     @GetMapping("/contestants/export")
     @ApiOperation(value = "导出参赛者列表为Excel", notes = "导出所有参赛者信息为xlsx并触发下载")
-    public Response<Void> exportContestants() throws Exception {
-        // 将文件保存到服务端本地目录（uploadDir/exports），不返回文件内容给客户端
-        globalAwardService.saveContestantsToLocal();
-        return Response.success();
+    public void exportContestants(HttpServletResponse response) throws Exception {
+        byte[] data = globalAwardService.exportContestants();
+        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
+        response.setHeader("Content-Disposition", "attachment; filename=\"contestants.xlsx\"");
+        response.setContentLength(data.length);
+        response.getOutputStream().write(data);
+        response.getOutputStream().flush();
     }
 
 }