我从这个blog post获得了完整的代码。我能够使用javac（windows java编译器），但在android studio中，它说无法连接到服务器。 Jar文件已经正确放置在libs文件夹中，编译文件（＆＃39; libs / jar＆＃39;）函数已经在built.grade中添加了
所有，我做了额外的是创建了FTP对象，并在博客文章中提供了调用方法，并将此代码修复为public boolean ftpConnect(String host, String username,
String password, int port)
：
"Error: could not connect to host " + host我还添加了互联网许可我的互联网也在。没有错误显示异常异常。 public class Ftp {
public FTPClient mFTPClient = null;
// Connect to the FTP server
public boolean ftpConnect(String host, String username, String password, int port){
try{
mFTPClient = new FTPClient();
// connecting to the host
Log.d("before","got entered");
mFTPClient.connect(host, port);
Log.d("after connect()", "didn't got connected");
// now check the reply code, if positive mean connection success
if(FTPReply.isPositiveCompletion(mFTPClient.getReplyCode())){
//login using username & password
Log.d("Final_Message", "Didn't got positive reply for connection");
boolean status = mFTPClient.login(username, password);
/*Set File Transfer
To avoid corruption issue you must specified a correct transfer mode,
such as ASCII_FILE_TYPE, BINARY_FILE_TYPE, etc. Here, I use Binary file type
for transferring text, image, and compressed files.
*/
mFTPClient.setFileType(FTP.BINARY_FILE_TYPE);
mFTPClient.enterLocalPassiveMode();
return status;
}
}catch (Exception e){
Log.d("ERRO", "Error: could not connect to host" + host);
}
return false;
}
public boolean ftpUpload(/*String srcFilePath, String desFileName, String desDirectory*/){
boolean status = false;
try{
FileInputStream srcFileStream = new FileInputStream("abhimanyu.txt"/*srcFilePath*/);
status = mFTPClient.storeFile("abhimanyu", srcFileStream);
// change working directory to the destrination directory
/*if(ftpChangeDirectory(desDirectory)){
status = mFTPClient.storeFile(desFileName, srcFileStream);
}*/
}catch (Exception e){
Log.d("ERRO", "upload filed");
}
return status;
}
}
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:1.3.0'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
allprojects {
repositories {
jcenter()
}
}
Gradle文件：
的build.gradle（项目：FTPConnection）
apply plugin: 'com.android.application'
android {
compileSdkVersion 22
buildToolsVersion "23.0.0 rc3"
defaultConfig {
applicationId "com.muchmore.www.ftpconnection"
minSdkVersion 10
targetSdkVersion 22
versionCode 1
versionName "1.0"
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard- android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile files('libs/commons-net-3.1.jar')
compile 'com.android.support:appcompat-v7:22.1.1'
}
built.gradle（模块：应用）
08-27 16:09:49.840 28535-28535/? D/before﹕ got entered
08-27 16:09:49.840 28535-28535/? D/libc-netbsd﹕ [getaddrinfo]: hostname=xxxxx; servname=(null); cache_mode=(null), netid=0; mark=0
08-27 16:09:49.840 28535-28535/? D/libc-netbsd﹕ [getaddrinfo]: ai_addrlen=0; ai_canonname=xxxxx; ai_flags=4; ai_family=0
08-27 16:09:49.840 28535-28535/? D/ERRO﹕ Error: could not connect to hostcp.mdurtk.in
08-27 16:09:49.840 28535-28535/? D/ERRO﹕ upload filed
08-27 16:09:49.840 28535-28535/? I/Activity﹕ Activity.onPostResume() called
08-27 16:09:49.850 28535-28556/? D/OpenGLRenderer﹕ Use EGL_SWAP_BEHAVIOR_PRESERVED: true
08-27 16:09:49.850 28535-28535/? D/Atlas﹕ Validating map...
08-27 16:09:49.860 1246-4970/? D/SplitWindow﹕ check instance of lgWin Window{1395dc05 u0 com.muchmore.www.ftpconnection/com.muchmore.www.ftpconnection.MainActivity}
08-27 16:09:49.860 1246-4970/? V/WindowManager﹕ Adding window Window{1395dc05 u0 com.muchmore.www.ftpconnection/com.muchmore.www.ftpconnection.MainActivity} at 4 of 14 (before Window{23ed7caa u0 Starting com.muchmore.www.ftpconnection})
08-27 16:09:49.880 28535-28556/? I/Adreno﹕ QUALCOMM build : 76ae100, Ie081474390
我的Android设备的日志太多，所以我将所选日志粘贴到我的代码中，显示连接错误。
日志
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Ftp obj = new Ftp();
obj.ftpConnect("******", "*****", "*****", 21);
obj.ftpUpload();
TextView f = (TextView)findViewById(R.id.message);
f.setText("Uploaded to server");
}
MainActivity
08-27 16:50:44.953 8963-8963/? D/ERRO﹕ Exception log starts here
08-27 16:50:44.953 8963-8963/? W/System.err﹕ android.os.NetworkOnMainThreadException
08-27 16:50:44.953 8963-8963/? W/System.err﹕ at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1147)
08-27 16:50:44.953 8963-8963/? W/System.err﹕ at java.net.InetAddress.lookupHostByName(InetAddress.java:426)
08-27 16:50:44.953 8963-8963/? W/System.err﹕ at java.net.InetAddress.getAllByNameImpl(InetAddress.java:255)
08-27 16:50:44.953 8963-8963/? W/System.err﹕ at java.net.InetAddress.getByName(InetAddress.java:308)
08-27 16:50:44.953 8963-8963/? W/System.err﹕ at org.apache.commons.net.SocketClient.connect(SocketClient.java:192)
08-27 16:50:44.953 8963-8963/? W/System.err﹕ at com.muchmore.www.ftpconnection.Ftp.ftpConnect(Ftp.java:23)
08-27 16:50:44.953 8963-8963/? W/System.err﹕ at com.muchmore.www.ftpconnection.MainActivity.onCreate(MainActivity.java:17)
08-27 16:50:44.953 8963-8963/? W/System.err﹕ at android.app.Activity.performCreate(Activity.java:6093)
08-27 16:50:44.953 8963-8963/? W/System.err﹕ at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
08-27 16:50:44.953 8963-8963/? W/System.err﹕ at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
08-27 16:50:44.953 8963-8963/? W/System.err﹕ at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2434)
08-27 16:50:44.953 8963-8963/? W/System.err﹕ at android.app.ActivityThread.access$800(ActivityThread.java:162)
08-27 16:50:44.953 8963-8963/? W/System.err﹕ at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1349)
08-27 16:50:44.953 8963-8963/? W/System.err﹕ at android.os.Handler.dispatchMessage(Handler.java:102)
08-27 16:50:44.953 8963-8963/? W/System.err﹕ at android.os.Looper.loop(Looper.java:135)
08-27 16:50:44.953 8963-8963/? W/System.err﹕ at android.app.ActivityThread.main(ActivityThread.java:5424)
08-27 16:50:44.953 8963-8963/? W/System.err﹕ at java.lang.reflect.Method.invoke(Native Method)
08-27 16:50:44.953 8963-8963/? W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:372)
08-27 16:50:44.953 8963-8963/? W/System.err﹕ at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:913)
08-27 16:50:44.953 8963-8963/? W/System.err﹕ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:706)
08-27 16:50:44.953 8963-8963/? D/ERRO﹕ Error: could not connect to hostcp.mdurtk.in
08-27 16:50:44.953 8963-8963/? D/ERRO﹕ upload failed
08-27 16:50:44.953 8963-8963/? W/System.err﹕ java.io.FileNotFoundException: abhimanyu.txt: open failed: ENOENT (No such file or directory)
08-27 16:50:44.963 8963-8963/? W/System.err﹕ at libcore.io.IoBridge.open(IoBridge.java:456)
08-27 16:50:44.963 8963-8963/? W/System.err﹕ at java.io.FileInputStream.<init>(FileInputStream.java:76)
08-27 16:50:44.963 8963-8963/? W/System.err﹕ at java.io.FileInputStream.<init>(FileInputStream.java:103)
08-27 16:50:44.963 8963-8963/? W/System.err﹕ at com.muchmore.www.ftpconnection.Ftp.ftpUpload(Ftp.java:177)
08-27 16:50:44.963 8963-8963/? W/System.err﹕ at com.muchmore.www.ftpconnection.MainActivity.onCreate(MainActivity.java:18)
08-27 16:50:44.963 8963-8963/? W/System.err﹕ at android.app.Activity.performCreate(Activity.java:6093)
08-27 16:50:44.963 8963-8963/? W/System.err﹕ at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
08-27 16:50:44.963 8963-8963/? W/System.err﹕ at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2325)
08-27 16:50:44.963 8963-8963/? W/System.err﹕ at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2434)
08-27 16:50:44.963 8963-8963/? W/System.err﹕ at android.app.ActivityThread.access$800(ActivityThread.java:162)
08-27 16:50:44.963 8963-8963/? W/System.err﹕ at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1349)
08-27 16:50:44.963 8963-8963/? W/System.err﹕ at android.os.Handler.dispatchMessage(Handler.java:102)
08-27 16:50:44.963 8963-8963/? W/System.err﹕ at android.os.Looper.loop(Looper.java:135)
08-27 16:50:44.963 8963-8963/? W/System.err﹕ at android.app.ActivityThread.main(ActivityThread.java:5424)
08-27 16:50:44.963 8963-8963/? W/System.err﹕ at java.lang.reflect.Method.invoke(Native Method)
08-27 16:50:44.963 8963-8963/? W/System.err﹕ at java.lang.reflect.Method.invoke(Method.java:372)
08-27 16:50:44.963 8963-8963/? W/System.err﹕ at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:913)
08-27 16:50:44.963 8963-8963/? W/System.err﹕ at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:706)
08-27 16:50:44.963 8963-8963/? W/System.err﹕ Caused by: android.system.ErrnoException: open failed: ENOENT (No such file or directory)
08-27 16:50:44.963 8963-8963/? W/System.err﹕ at libcore.io.Posix.open(Native Method)
08-27 16:50:44.963 8963-8963/? W/System.err﹕ at libcore.io.BlockGuardOs.open(BlockGuardOs.java:186)
08-27 16:50:44.963 8963-8963/? W/System.err﹕ at libcore.io.IoBridge.open(IoBridge.java:442)
08-27 16:50:44.963 8963-8963/? W/System.err﹕ ... 17 more
异常日志
execute(new String[]{"/api/player/55707e1eb7396de50dcef73d"})