小记，随时记录开发中的事

1，How to clear the command prompt screen?

windows : cls

linux : clear

2,eclipse 中配置的tomcat server起来后，浏览器中mypcName:8080/显示404错误

1. Click on Window > Show view > Server OR right click on the server in "Servers" view, select "Properties".
2. In the "General" panel, click on the "Switch Location" button.
3. The "Location: [workspace metadata]" should replace by something else.
4. Open the Overview screen for the server by double clicking it(Tomcat v7.0 Server at localhost.server).
5. In the Server locations tab , select "Use Tomcat location".
6. Save the configurations and restart the Server.

You may want to follow the steps above before starting the server. Because server location section goes grayed-unreachable.

参考：http://stackoverflow.com/questions/16340711/tomcat-http-status-404

这时候mypcName:8080可以看到tomcat的默认页面。但是mypcName:8080/myproject/index.jsp还是404.

在Tomcat v7.0 Server at localhost上点右键，选择Add or Remove，把myproject选到右边，重启tomcat，打开了index.jsp