在eclipse项目索引中去掉Maven生成的target目录

StackOverflow上的解决方法：

1. Mark the "target" folders as "derived" resource from the properties screen of those folders (this option is next to read only and archive property).

2. In the quick search (Ctrl+Shift+R) screen press the arrow in the top right corner and untick "Show derived resources".

Then those target-files will not be considered in the quick search anymore.

大致意思是：

1. 在eclipse中在target/目录上右键属性，勾选 derived 复选框。

2. 执行快速搜索时，在右上角的菜单中把"Show derived resources"的选项去掉。