flutter中集成Excel导入和导出功能
1、需要的依赖
在pubspec.yaml
#excel导出
syncfusion_flutter_xlsio: ^24.1.45
open_file: ^3.0.1
#导入excel
flutter_excel: ^1.0.1
#选择文件的依赖
file_picker: ^6.1.1
（1）依赖说明
在测试时，我们在使用导出发现只有syncfusion_flutter_xlsio没问题，其他的或多或少会出现问题
在测试时，我们开发导出Excel时，发现只有syncfusion_flutter_xlsio可以使用，其他的库会出现一些Duplicate class错误如下：
* What went wrong:
Execution failed for task ':app:checkDebugDuplicateClasses'.
> A failure occurred while executing com.android.build.gradle.internal.tasks.CheckDuplicatesRunnable
> Duplicate class kotlin.collections.jdk8.CollectionsJDK8Kt found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk8-1.5.30 (org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.5.30)
Duplicate class kotlin.internal.jdk7.JDK7PlatformImplementations found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk7-1.7.22 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.7.22)
Duplicate class kotlin.internal.jdk7.JDK7PlatformImplementations$ReflectSdkVersion found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk7-1.7.22 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.7.22)
Duplicate class kotlin.internal.jdk8.JDK8PlatformImplementations found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk8-1.5.30 (org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.5.30)
Duplicate class kotlin.io.path.DirectoryEntriesReader found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk7-1.7.22 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.7.22)
Duplicate class kotlin.io.path.ExperimentalPathApi found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk7-1.7.22 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.7.22)
Duplicate class kotlin.io.path.FileVisitorBuilder found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk7-1.7.22 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.7.22)
Duplicate class kotlin.io.path.FileVisitorBuilderImpl found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk7-1.7.22 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.7.22)
Duplicate class kotlin.io.path.FileVisitorImpl found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk7-1.7.22 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.7.22)
Duplicate class kotlin.io.path.LinkFollowing found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk7-1.7.22 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.7.22)
Duplicate class kotlin.io.path.PathNode found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk7-1.7.22 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.7.22)
Duplicate class kotlin.io.path.PathRelativizer found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk7-1.7.22 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.7.22)
Duplicate class kotlin.io.path.PathTreeWalk found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk7-1.7.22 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.7.22)
Duplicate class kotlin.io.path.PathTreeWalk$bfsIterator$1 found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk7-1.7.22 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.7.22)
Duplicate class kotlin.io.path.PathTreeWalk$dfsIterator$1 found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk7-1.7.22 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.7.22)
Duplicate class kotlin.io.path.PathTreeWalkKt found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk7-1.7.22 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.7.22)
Duplicate class kotlin.io.path.PathWalkOption found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk7-1.7.22 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.7.22)
Duplicate class kotlin.io.path.PathsKt found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk7-1.7.22 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.7.22)
Duplicate class kotlin.io.path.PathsKt__PathReadWriteKt found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk7-1.7.22 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.7.22)
Duplicate class kotlin.io.path.PathsKt__PathUtilsKt found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk7-1.7.22 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.7.22)
Duplicate class kotlin.jdk7.AutoCloseableKt found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk7-1.7.22 (org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.7.22)
Duplicate class kotlin.random.jdk8.PlatformThreadLocalRandom found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk8-1.5.30 (org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.5.30)
Duplicate class kotlin.streams.jdk8.StreamsKt found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk8-1.5.30 (org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.5.30)
Duplicate class kotlin.streams.jdk8.StreamsKt$asSequence$$inlined$Sequence$1 found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk8-1.5.30 (org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.5.30)
Duplicate class kotlin.streams.jdk8.StreamsKt$asSequence$$inlined$Sequence$2 found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk8-1.5.30 (org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.5.30)
Duplicate class kotlin.streams.jdk8.StreamsKt$asSequence$$inlined$Sequence$3 found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk8-1.5.30 (org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.5.30)
Duplicate class kotlin.streams.jdk8.StreamsKt$asSequence$$inlined$Sequence$4 found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk8-1.5.30 (org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.5.30)
Duplicate class kotlin.text.jdk8.RegexExtensionsJDK8Kt found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk8-1.5.30 (org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.5.30)
Duplicate class kotlin.time.jdk8.DurationConversionsJDK8Kt found in modules jetified-kotlin-stdlib-1.8.22 (org.jetbrains.kotlin:kotlin-stdlib:1.8.22) and jetified-kotlin-stdlib-jdk8-1.5.30 (org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.5.30)
但是使用该库的时候还是会出现一个问题，如下：
workbook.dispose();
就是在释放workbook的时候会出现报错，报错如下
Unsupported operation: Cannot clear an unmodifiable list
介于篇幅的圆心，咱们现阶段先把这句话注释掉，表面上解决该问题，等再来一篇文章分析这个问题和解决这个问题。
因为这个库只有导出功能，没有导入功能所以我们有引入了另一个导入excel的库flutter_excel，这个库有个要求就是导入的excel的后缀必须时xsls的，为了打开本地的文件目录我们还需要一个库file_picker
打开手机的文件权限
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
存储的读写权限打开
示例代码摘抄库中相应的示例代码即可
