This XML file does not appear to have any style information associated with it. The document tree is

今天打开自己的web项目，结果那个jsp，或者html代码在浏览器一下子显示源码啦。OMG，这是什么鬼，然后上面就报了一行：This XML file does not appear to have any style information associated with it. The document tree is shown below.
页面情况是这样的：

于是就有了解决办法：把web.xml中的web-app标签中的属性全部去掉，然后重新启动项目即可。再点击浏览器就会显示效果了。

nice，很漂亮。