方式1. 右键文件或者文件夹 git -> Add to .gitignore   即可忽略

你会发现在.git/info/exclude 文件中 出现刚刚添加的忽略文件

# git ls-files --others --exclude-from=.git/info/exclude
# Lines that start with '#' are comments.
# For a project mostly in C, the following would be a good set of
# exclude patterns (uncomment them if you want to use them):
# *.[oa]
# *~
/data/log/

方式2

1.安装.gitignore插件，点击File->Settings

 2.在左侧菜单找到（1）点击Plugins，（2）点击Browse repositories 3.安装插件

3.重启idea

  之后在项目中会出现.gitignore文件

增加忽略文件