java - 尝试在 Android 中打开 Excel 文件时不断收到 FileNotFound 异常

Question

我在 MainActivity.java 中有以下代码行:

Workbook myWorkBook = WorkbookFactory.create(new File("C://sampleWB.xlsx"));

抛出以下错误:java.io.FileNotFoundException

我还尝试在 Assets 文件夹(app > src > main > assets)中添加excel文件，并尝试了以下代码，但抛出了相同的异常。

Workbook myWorkBook = WorkbookFactory.create(new File("sampleWB.xlsx"));

我在 AndroidManifest.xml 中添加了以下内容，但也没有解决任何问题:

<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>

如果有任何帮助，这是我的 build.gradle 文件:

apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "com.test.testProj"
        minSdkVersion 26
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:28.0.0-alpha1'
    implementation 'com.android.support.constraint:constraint-layout:1.1.2'
    implementation "org.apache.poi:poi:3.17"
    implementation "org.apache.poi:poi-ooxml:3.17"
    implementation 'com.fasterxml:aalto-xml:1.0.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
}

Answer 1

您似乎正在使用“C://sampleWB.xlsx”作为文件名。如 this answer 中所述: 和 / 不是文件名的有效字符。

要访问 assets 文件夹中的文件，请参阅 this answer :

Place your text file in the /assets directory under the Android project and use AssetManager class as follows to access it.

AssetManager am = context.getAssets();
InputStream is = am.open("default_book.txt");

Or you can also put the file in the /res/raw directory, from where the file can be accessed by an id as follows

InputStream is = 
context.getResources().openRawResource(R.raw.default_book);