已经在 stage 的文件再配置到 .gitignore 不生效

背景：

在管理一个版本库时，有时候不想要管理某些文件，如自己的测试文件，或涉及到有密码的配置文件。这时我们只需要把这些不想被管理的文件（文件夹）配置到 .gitignore 文件中即可。
但对于已经被 staged 文件，加入 .gitignore 文件时一定先要从 stage 中移除，.gitignore 配置才能生效。
下面就给出一个具体的实例：
本实例是不想要 target 文件夹下所以的文件,并保存。

1、把 target 配置到 .gitignore 文件中

protrait/target/*

2、在执行 git status 命令。

D:\project\sz\tagging-system>git status
On branch master
Your branch is up-to-date with ‘origin/master’.
Changes not staged for commit:
(use “git add …” to update what will be committed)
(use “git checkout – …” to discard changes in working directory)

    modified:   portrait/target/classes/test/Test.class    modified:   portrait/target/maven-status/maven-compiler-plugin/compile/default-compile/createdFiles.lst    modified:   portrait/target/maven-status/maven-compiler-plugin/compile/default-compile/inputFiles.lst    modified:   portrait/target/portrait-1.0-SNAPSHOT-jar-with-dependencies.jar

3、发现 target 文件夹并没有消失，这是怎么回事？

这时需要把 target 从 stage 中删除

3.1、执行 git rm –cached portrait/target/*

D:\project\sz\tagging-system>git rm –cached portrait/target/*

rm ‘portrait/target/classes/cn/sz/changephone/BdsChangeDeviceDMapper.class′rm‘portrait/target/classes/cn/sz/changephone/BdsChangeDeviceDMidReducer.class’
rm ‘portrait/target/classes/cn/sz/changephone/BdsChangeDeviceDReducer.class′rm‘portrait/target/classes/cn/sz/changephone/BdsChangeDeviceD.class′rm‘portrait/target/classes/cn/sz/changephone/OdsChangeDeviceDMapper.class’
rm ‘portrait/target/classes/cn/sz/changephone/OdsChangeDeviceDReducer.class′rm‘portrait/target/classes/cn/sz/changephone/OdsChangeDeviceD.class′rm‘portrait/target/classes/cn/sz/sex/MyIKAnalyzer.class′rm‘portrait/target/classes/cn/sz/sex/TrainingData.class′rm‘portrait/target/classes/cn/sz/sex/TrainingOnlineDataBean.class’
rm ‘portrait/target/classes/cn/sz/sex/TrainingOnlineData.class’
rm ‘portrait/target/classes/cn/sz/sourcedata/GetFeatureDataMapper.class′rm‘portrait/target/classes/cn/sz/sourcedata/GetFeatureDataReducer.class’
rm ‘portrait/target/classes/cn/sz/sourcedata/GetFeatureData.class’
rm ‘portrait/target/classes/cn/sz/utils/FileUtil.class’
rm ‘portrait/target/classes/cn/sz/utils/MiscUtil.class’
rm ‘portrait/target/classes/test/Test.class’
rm ‘portrait/target/maven-archiver/pom.properties’
rm ‘portrait/target/maven-status/maven-compiler-plugin/compile/default-compile/createdFiles.lst’
rm ‘portrait/target/maven-status/maven-compiler-plugin/compile/default-compile/inputFiles.lst’
rm ‘portrait/target/maven-status/maven-compiler-plugin/testCompile/default-testCompile/inputFiles.lst’
rm ‘portrait/target/portrait-1.0-SNAPSHOT-jar-with-dependencies.jar’

3.2、执行 git status 命令

D:\project\sz\tagging-system>git status
On branch master
Your branch is up-to-date with ‘origin/master’.
Changes to be committed:
(use “git reset HEAD …” to unstage)

    deleted:    portrait/target/classes/cn/sz/changephone/BdsChangeDeviceD$Mapper.class    deleted:    portrait/target/classes/cn/sz/changephone/BdsChangeDeviceD$MidReducer.class    deleted:    portrait/target/classes/cn/sz/changephone/BdsChangeDeviceD$Reducer.class    deleted:    portrait/target/classes/cn/sz/changephone/BdsChangeDeviceD.class    deleted:    portrait/target/classes/cn/sz/changephone/OdsChangeDeviceD$Mapper.class    deleted:    portrait/target/classes/cn/sz/changephone/OdsChangeDeviceD$Reducer.class    deleted:    portrait/target/classes/cn/sz/changephone/OdsChangeDeviceD.class    deleted:    portrait/target/classes/cn/sz/sex/MyIKAnalyzer.class    deleted:    portrait/target/classes/cn/sz/sex/TrainingData.class    deleted:    portrait/target/classes/cn/sz/sex/TrainingOnlineData$Bean.class    deleted:    portrait/target/classes/cn/sz/sex/TrainingOnlineData.class    deleted:    portrait/target/classes/cn/sz/sourcedata/GetFeatureData$Mapper.class    deleted:    portrait/target/classes/cn/sz/sourcedata/GetFeatureData$Reducer.class    deleted:    portrait/target/classes/cn/sz/sourcedata/GetFeatureData.class    deleted:    portrait/target/classes/cn/sz/utils/FileUtil.class    deleted:    portrait/target/classes/cn/sz/utils/MiscUtil.class    deleted:    portrait/target/classes/test/Test.class    deleted:    portrait/target/maven-archiver/pom.properties    deleted:    portrait/target/maven-status/maven-compiler-plugin/compile/default-compile/createdFiles.lst    deleted:    portrait/target/maven-status/maven-compiler-plugin/compile/default-compile/inputFiles.lst    deleted:    portrait/target/maven-status/maven-compiler-plugin/testCompile/default-testCompile/inputFiles.lst    deleted:    portrait/target/portrait-1.0-SNAPSHOT-jar-with-dependencies.jar    deleted:    portrait/target/portrait-1.0-SNAPSHOT.jar

3.3、看还在，需要继续执行命令 git commit -m “describe for this commit”

D:\project\sz\tagging-system>git commit -m “commit DeviceSexAlgorithm.java”
[master ca4f9e0] commit DeviceSexAlgorithm.java
26 files changed, 234 insertions(+), 206 deletions(-)
create mode 100644 portrait/src/main/java/cn/sz/sex/DeviceSexAlgorithm.java
delete mode 100644 portrait/src/main/java/test/Test.java
delete mode 100644 portrait/target/classes/cn/sz/changephone/BdsChangeDeviceDMapper.classdeletemode100644portrait/target/classes/cn/sz/changephone/BdsChangeDeviceDMidReducer.class
delete mode 100644 portrait/target/classes/cn/sz/changephone/BdsChangeDeviceDReducer.classdeletemode100644portrait/target/classes/cn/sz/changephone/BdsChangeDeviceD.classdeletemode100644portrait/target/classes/cn/sz/changephone/OdsChangeDeviceDMapper.class
delete mode 100644 portrait/target/classes/cn/sz/changephone/OdsChangeDeviceDReducer.classdeletemode100644portrait/target/classes/cn/sz/changephone/OdsChangeDeviceD.classdeletemode100644portrait/target/classes/cn/sz/sex/MyIKAnalyzer.classdeletemode100644portrait/target/classes/cn/sz/sex/TrainingData.classdeletemode100644portrait/target/classes/cn/sz/sex/TrainingOnlineDataBean.class
delete mode 100644 portrait/target/classes/cn/sz/sex/TrainingOnlineData.class
delete mode 100644 portrait/target/classes/cn/sz/sourcedata/GetFeatureDataMapper.classdeletemode100644portrait/target/classes/cn/sz/sourcedata/GetFeatureDataReducer.class
delete mode 100644 portrait/target/classes/cn/sz/sourcedata/GetFeatureData.class
delete mode 100644 portrait/target/classes/cn/sz/utils/FileUtil.class
delete mode 100644 portrait/target/classes/cn/sz/utils/MiscUtil.class
delete mode 100644 portrait/target/classes/test/Test.class
delete mode 100644 portrait/target/maven-archiver/pom.properties
delete mode 100644 portrait/target/maven-status/maven-compiler-plugin/compile/default-compile/createdFiles.lst
delete mode 100644 portrait/target/maven-status/maven-compiler-plugin/compile/default-compile/inputFiles.lst
delete mode 100644 portrait/target/maven-status/maven-compiler-plugin/testCompile/default-testCompile/inputFiles.lst
delete mode 100644 portrait/target/portrait-1.0-SNAPSHOT-jar-with-dependencies.jar
delete mode 100644 portrait/target/portrait-1.0-SNAPSHOT.jar

3.4、再执行 git status 看下

D:\project\sz\tagging-system>git status
On branch master
Your branch is ahead of ‘origin/master’ by 2 commits.
(use “git push” to publish your local commits)
nothing to commit, working tree clean

4、这下就 OK 了。

5、简单总结下:

如果不想再管理已经被 stage 的文件（文件夹）
可以按照下面的步骤来处理。

1、先从 stage 中删除不想再被管理的文件（文件夹）

git rm –cached file

2、提交更新

git commit -m “describe for this commit”

3、把该文件（文件夹）配置到 .gitignore 文件中，当然了这一步也可以先做。

4、在执行 git status 命令就可以得到自己想要的结果了。