我正在尝试在我的Android应用程序中使用Apache POI，以便我可以读取MS Word文件。我正在集成POIA库，该库可以在Android(https://github.com/SUPERCILEX/poi-android(上使用Apache POI。但是，当我运行代码并在 Word 文件中读取时，我收到以下错误：
org.apache.poi.javax.xml.stream.FactoryConfigurationError： Provider com.bea.xml.stream.EventFactory 未找到
下面是我的代码(我在第一行收到错误(：
var document = XWPFDocument(uri?.let { contentResolver.openInputStream(it) });
var extractor = XWPFWordExtractor(document);
var documentText = extractor.text; // Retrieve the document's text
以下是我的成绩(项目级别(：
// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
ext.kotlin_version = '1.3.60'
repositories {
google()
jcenter()
}
ext {
poiVersion = '3.17'
}
dependencies {
classpath 'com.android.tools:r8:1.4.93'
classpath 'com.android.tools.build:gradle:3.4.2'
classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
google()
jcenter()
maven { url 'https://jitpack.io' }
}
}
task clean(type: Delete) {
delete rootProject.buildDir
}
以下是我的成绩(应用级别(：
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'
android {
compileSdkVersion 29
buildToolsVersion "29.0.2"
defaultConfig {
applicationId "com.example.diffchecker"
minSdkVersion 21
targetSdkVersion 29
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(include: ['*.jar'], dir: 'libs')
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
implementation 'androidx.appcompat:appcompat:1.1.0'
implementation 'androidx.core:core-ktx:1.1.0'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
// For developers using the Android Support Library
implementation 'pub.devrel:easypermissions:2.0.1'
implementation 'com.google.android.gms:play-services-ads:18.3.0'
implementation "com.github.SUPERCILEX.poi-android:poi:$poiVersion"
}
以下是完整的堆栈跟踪：
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.diffchecker, PID: 2292
org.apache.poi.javax.xml.stream.FactoryConfigurationError: Provider com.bea.xml.stream.EventFactory not found
at org.apache.poi.javax.xml.stream.FactoryFinder.newInstance(FactoryFinder.java:72)
at org.apache.poi.javax.xml.stream.FactoryFinder.find(FactoryFinder.java:178)
at org.apache.poi.javax.xml.stream.FactoryFinder.find(FactoryFinder.java:92)
at org.apache.poi.javax.xml.stream.XMLEventFactory.newInstance(XMLEventFactory.java:30)
at org.apache.poi.openxml4j.opc.internal.marshallers.PackagePropertiesMarshaller.<clinit>(PackagePropertiesMarshaller.java:41)
at org.apache.poi.openxml4j.opc.OPCPackage.init(OPCPackage.java:161)
at org.apache.poi.openxml4j.opc.OPCPackage.<init>(OPCPackage.java:141)
at org.apache.poi.openxml4j.opc.ZipPackage.<init>(ZipPackage.java:97)
at org.apache.poi.openxml4j.opc.OPCPackage.open(OPCPackage.java:324)
at org.apache.poi.util.PackageHelper.open(PackageHelper.java:37)
at org.apache.poi.xwpf.usermodel.XWPFDocument.<init>(XWPFDocument.java:116)
at com.example.diffchecker.MainActivity.onActivityResult(MainActivity.kt:249)
at android.app.Activity.dispatchActivityResult(Activity.java:7759)
at android.app.ActivityThread.deliverResults(ActivityThread.java:4598)
at android.app.ActivityThread.handleSendResult(ActivityThread.java:4647)
at android.app.servertransaction.ActivityResultItem.execute(ActivityResultItem.java:49)
at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1948)
at android.os.Handler.dispatchMessage(Handler.java:106)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7045)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:964)
我设法成功运行了配置类似于您的应用程序的 ann 应用程序。
- 首先，我从poi-android中排除了stax，因为它可能已经过时(从而导致问题(，Java 6及更高版本实际上不再需要它。
app/build.gradle
implementation ("com.github.SUPERCILEX.poi-android:poi:$poiVersion") {
exclude group: 'stax', module: 'stax-api'
}
- 其次，在我的
Application课上，我更新了 3 个系统属性，如下所示：
MainApplication.kt
override fun onCreate() {
super.onCreate()
System.setProperty("org.apache.poi.javax.xml.stream.XMLInputFactory", "com.fasterxml.aalto.stax.InputFactoryImpl")
System.setProperty("org.apache.poi.javax.xml.stream.XMLOutputFactory", "com.fasterxml.aalto.stax.OutputFactoryImpl")
System.setProperty("org.apache.poi.javax.xml.stream.XMLEventFactory", "com.fasterxml.aalto.stax.EventFactoryImpl")
...
}
- 最后，我构建并运行了该应用程序 ->它成功打开 。
这是 Android 上的常见问题，因为不支持此 Java 类：
找不到提供程序
com.bea.xml.stream.EventFactory。
您必须添加com.fasterxml:aalto-xml并排除stax2-api-4.1.jar：
// implementation "com.fasterxml:aalto-xml:1.1.0"
implementation ("com.github.SUPERCILEX.poi-android:poi:3.17" {
exclude group: "org.codehaus.woodstox", module: "stax2-api"
}
然后更新系统属性：
init {
System.setProperty("org.apache.poi.javax.xml.stream.XMLInputFactory", "com.fasterxml.aalto.stax.InputFactoryImpl")
System.setProperty("org.apache.poi.javax.xml.stream.XMLOutputFactory", "com.fasterxml.aalto.stax.OutputFactoryImpl")
System.setProperty("org.apache.poi.javax.xml.stream.XMLEventFactory", "com.fasterxml.aalto.stax.EventFactoryImpl")
}
在Java中，这将是static关键字。在 Kotlin 上init应该还够早。
包含 Aalto，一个开源 JSR173 提供程序，通过将其添加到应用程序的 gradle
implementation group: 'com.fasterxml', name: 'aalto-xml', version: '1.0.0'
然后 POI 使用以下代码使用 Aalto(将其放在我的应用程序的 onCreate(( 中(，但我假设在使用 Poiji 之前的其他任何地方也可以。
System.setProperty("org.apache.poi.javax.xml.stream.XMLInputFactory","com.fasterxml.aalto.stax.InputFactoryImpl");
System.setProperty("org.apache.poi.javax.xml.stream.XMLOutputFactory", "com.fasterxml.aalto.stax.OutputFactoryImpl");
System.setProperty("org.apache.poi.javax.xml.stream.XMLEventFactory", "com.fasterxml.aalto.stax.EventFactoryImpl");
现在我的应用程序正在正确读取 XLSX 文件