如果加载头像时发生了错误，则显示一个默认头像

ruoyi-admin/src/main/resources/templates/index.html

@@ -36,7 +36,7 @@
             			<a class="menuItem noactive" title="个人中心" th:href="@{/system/user/profile}"> 
             				<div class="hide" th:text="个人中心"></div>
 					        <div class="pull-left image">
-		                    	<img th:src="(${user.avatar} == '') ? @{/img/profile.jpg} : @{${user.avatar}}" class="img-circle" alt="User Image">
+		                    	<img th:src="(${user.avatar} == '') ? @{/img/profile.jpg} : @{${user.avatar}}" th:onerror="this.src='img/profile.jpg'" class="img-circle" alt="User Image">
 					        </div>
 				        </a>
 				        <div class="pull-left info">
@@ -185,7 +185,7 @@
 	                <li><a title="全屏显示" href="javascript:void(0)" id="fullScreen"><i class="fa fa-arrows-alt"></i> 全屏显示</a></li>
                     <li class="dropdown user-menu">
 						<a href="javascript:void(0)" class="dropdown-toggle" data-hover="dropdown">
-							<img th:src="(${user.avatar} == '') ? @{/img/profile.jpg} : @{${user.avatar}}" class="user-image">
+							<img th:src="(${user.avatar} == '') ? @{/img/profile.jpg} : @{${user.avatar}}" th:onerror="this.src='img/profile.jpg'" class="user-image">
 							<span class="hidden-xs">[[${#strings.defaultString(user.userName, '-')}]]</span>
 						</a>
 						<ul class="dropdown-menu">

ruoyi-common/src/main/java/com/ruoyi/common/annotation/Excel.java

@@ -25,7 +25,7 @@ public @interface Excel
     public String dateFormat() default "";
 
     /**
-     * 如果是字典类型，请设置字典的type值
+     * 如果是字典类型，请设置字典的type值 (如: sys_user_sex)
      */
     public String dictType() default "";