!429 update 优化 通过参数键名获取键值接口的返回体

Merge pull request !429 from David Wei/update/config_response

ruoyi-modules/ruoyi-system/src/main/java/org/dromara/system/controller/system/SysConfigController.java

@@ -68,8 +68,8 @@ public class SysConfigController extends BaseController {
      * @param configKey 参数Key
      */
     @GetMapping(value = "/configKey/{configKey}")
-    public R<Void> getConfigKey(@PathVariable String configKey) {
+    public R<String> getConfigKey(@PathVariable String configKey) {
-        return R.ok(configService.selectConfigByKey(configKey));
+        return R.ok("操作成功", configService.selectConfigByKey(configKey));
     }
 
     /**