登录逻辑完善，注销功能实现

mailbox-outer-admin/src/main/java/com/biutag/outeradmin/controller/LoginController.java

@@ -36,6 +36,7 @@ public class LoginController {
             if (user == null) {
                 return ErrorEnum.LOGIN_ACCOUNT_ERROR.getCode();
             } else {
+                request.getSession().setAttribute("user", user);
                 return ErrorEnum.SUCCESS.getCode();
             }
         }
@@ -56,4 +57,10 @@ public class LoginController {
         }
 
     }
+
+    @RequestMapping("/logout")
+    public int logout(HttpServletRequest request) {
+        request.getSession().removeAttribute("user");
+        return ErrorEnum.SUCCESS.getCode();
+    }
 }