Update UmsAdminServiceImpl.java

mall-admin/src/main/java/com/macro/mall/service/impl/UmsAdminServiceImpl.java

@@ -60,13 +60,16 @@ public class UmsAdminServiceImpl implements UmsAdminService {
 
     @Override
     public UmsAdmin getAdminByUsername(String username) {
+        //先从缓存中获取数据
         UmsAdmin admin = getCacheService().getAdmin(username);
-        if(admin!=null) return  admin;
+        if (admin != null) return admin;
+        //缓存中没有从数据库中获取
         UmsAdminExample example = new UmsAdminExample();
         example.createCriteria().andUsernameEqualTo(username);
         List<UmsAdmin> adminList = adminMapper.selectByExample(example);
         if (adminList != null && adminList.size() > 0) {
             admin = adminList.get(0);
+            //将数据库中的数据存入缓存中
             getCacheService().setAdmin(admin);
             return admin;
         }