would dispatch back to the current handler URL [/updateh] again. Check your

错误页面提示：
would dispatch back to the current handler URL [/deleteh] again. Check your ViewResolver setup! (Hint: This may be the result of an unspecified view, due to default view name generation.)

解决方法：

将控制器里面的controller注解换成RestController就可以了。

即上图转换成下图:

这样就解决了，如果不改成RestController，虽然浏览器上会报错，但是数据库里面的相关操作还是实现了的。