在Android应用中嵌入Apache FTP服务器

问题描述

我正在寻找一个将Android设备变成FTP服务器的库。 Java FTP客户端似乎有无数的库，但是我在看到了一个问题

因此，我在这里遵循本教程：

但是运行我的应用程序会给我一个NoClassDefFoundError

MainActivity.java

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        FtpServerFactory serverFactory = new FtpServerFactory();
        FtpServer server = serverFactory.createServer();
        // start the server
        try {
            server.start();
        } catch (FtpException e) {
            e.printStackTrace();
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 22
    buildToolsVersion "22.0.1"

    defaultConfig {
        applicationId "com.ken.androidftpserver"
        minSdkVersion 15
        targetSdkVersion 22
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }

    packagingOptions {
        exclude 'META-INF/DEPENDENCIES.txt'
        exclude 'META-INF/LICENSE.txt'
        exclude 'META-INF/NOTICE.txt'
        exclude 'META-INF/NOTICE'
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/DEPENDENCIES'
        exclude 'META-INF/notice.txt'
        exclude 'META-INF/license.txt'
        exclude 'META-INF/dependencies.txt'
        exclude 'META-INF/LGPL2.1'
    }
}

Logcat：

java.lang.NoClassDefFoundError: Failed resolution of: Lorg/apache/mina/filter/executor/OrderedThreadPoolExecutor;
        at org.apache.ftpserver.listener.nio.NioListener.<init>(NioListener.java:76)
        at org.apache.ftpserver.listener.ListenerFactory.createListener(ListenerFactory.java:90)
        at org.apache.ftpserver.impl.DefaultFtpServerContext.<init>(DefaultFtpServerContext.java:91)
        at org.apache.ftpserver.FtpServerFactory.<init>(FtpServerFactory.java:51)
        at com.ken.androidftpserver.MainActivity.onCreate(MainActivity.java:19)
        at android.app.Activity.performCreate(Activity.java:5958)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1129)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2474)
        at android.app.ActivityThread.access$800(ActivityThread.java:144)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1359)
        at android.os.Handler.dispatchMessage(Handler.java:102)
        at android.os.Looper.loop(Looper.java:155)
        at android.app.ActivityThread.main(ActivityThread.java:5696)
        at java.lang.reflect.Method.invoke(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:372)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1028)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823)
 Caused by: java.lang.ClassNotFoundException: Didn't find class "org.apache.mina.filter.executor.OrderedThreadPoolExecutor" on path: DexPathList[[zip file "/data/app/com.ken.androidftpserver-1/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
            at org.apache.ftpserver.listener.nio.NioListener.<init>(NioListener.java:76)
            at org.apache.ftpserver.listener.ListenerFactory.createListener(ListenerFactory.java:90)
            at org.apache.ftpserver.impl.DefaultFtpServerContext.<init>(DefaultFtpServerContext.java:91)
            at org.apache.ftpserver.FtpServerFactory.<init>(FtpServerFactory.java:51)
            at com.ken.androidftpserver.MainActivity.onCreate(MainActivity.java:19)
            at android.app.Activity.performCreate(Activity.java:5958)
            at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1129)
            at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2364)
            at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2474)
            at android.app.ActivityThread.access$800(ActivityThread.java:144)
            at      android.app.ActivityThread$H.handleMessage(ActivityThread.java:1359)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:155)
            at android.app.ActivityThread.main(ActivityThread.java:5696)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1028)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823)
Suppressed: java.lang.ClassNotFoundException: org.apache.mina.filter.executor.OrderedThreadPoolExecutor
        at java.lang.Class.classForName(Native Method)
        at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
        at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
        ... 19 more
 Caused by: java.lang.NoClassDefFoundError: Class not found using the    boot class loader; no stack available

那里有图书馆吗？