Android从ftp服务器获取文件

window搭建ftp服务器的步骤在这里，亲测可行：

http://blog.sina.com.cn/s/blog_3f7e47f20100haur.html

主要留意一下绑定的ip地址，以后要用到

要想从ftp服务器获取文件还要用到一个ftp4j的jar包。官网：http://www.sauronsoftware.it/projects/ftp4j/。可以把它先下载下来再参考/doc/manual.en.html来使用

1.把解压出来的jar文件放到libs目录中去

2.布局文件

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.example.getpkgfromftp.MainActivity" >

<!-- ip地址 -->

<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/ip"
android:textSize="30sp" />

<!-- 端口号 -->

<TextView
android:id="@+id/pkgRoute"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/port"
android:textSize="30sp" />

<!-- 用户名 -->

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:focusable="true"
android:focusableInTouchMode="true" >

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/username"
android:textSize="20sp" />

<EditText
android:id="@+id/etUserName"
android:layout_width="0sp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@android:drawable/edit_text"
android:hint="@string/username"
android:text="@string/user"
android:textSize="20sp" />

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/_suffix"
android:textSize="20sp" />
</LinearLayout>

<!-- 密码 -->

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:focusable="true"
android:focusableInTouchMode="true" >

<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/pwd"
android:textSize="20sp" />

<EditText
android:id="@+id/etPwd"
android:layout_width="0sp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:background="@android:drawable/edit_text"
android:hint="@string/default_pwd"
android:text="@string/default_pwd"
android:textSize="20sp" />
</LinearLayout>

<Button
android:id="@+id/btnGet"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="@string/get" />

<!-- 用来显示ftp服务器里面的文件列表 -->

<ListView
android:id="@+id/listView1"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</ListView>

</LinearLayout>

3.mainactivity

package com.example.getpkgfromftp;

import it.sauronsoftware.ftp4j.FTPClient;
import it.sauronsoftware.ftp4j.FTPDataTransferListener;

import java.io.File;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Toast;

public class MainActivity extends Activity {
/** 只需要ip地址，不需要前面的ftp:// */
private static final String HOST = "";
private static final int PORT = 21;
private String USERNAME = "";
private String PASSWORD = "";

private ListView listView;
private ArrayAdapter<String> adapter;

private FTPClient client;

private Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
if (msg.what == 0x001) {
adapter.add((String) msg.obj);
} else if (msg.what == 0x002) {
Toast.makeText(MainActivity.this,
"connect fail", Toast.LENGTH_SHORT)
.show();
}
}
};

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

USERNAME = ((EditText) findViewById(R.id.etUserName)).getText()
.toString();
USERNAME += "@***.com";//这里是你的域名。一般公司给员工分配的用户名都有@的后缀
PASSWORD = ((EditText) findViewById(R.id.etPwd)).getText().toString();
Log.i("USERNAME", USERNAME);
Log.i("PASSWORD", PASSWORD);

listView = (ListView) findViewById(R.id.listView1);
adapter = new ArrayAdapter<String>(this,
android.R.layout.simple_list_item_1);
listView.setAdapter(adapter);
((Button) findViewById(R.id.btnGet))
.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
adapter.clear();
new Thread(new Runnable() {
@Override
public void run() {
client = new FTPClient();
try {
client.connect(HOST, PORT);
client.login(USERNAME, PASSWORD);
String[] file = client.listNames();
for (int i = 0; i < file.length; i++) {
Log.i("file", file[i]);
Message message = handler
.obtainMessage(0x001, file[i]);
handler.sendMessage(message);
}
} catch (Exception e) {
handler.sendEmptyMessage(0x002);
return;
}
}
}).start();
}
});
/**
* commons-net-3.0.1.jar
* listNames返回NULL,list返回Int,listFiles返回NULL
* 因为传进去的参数是(String)null
* 自己可以去了解，我这里就不演示了
*/

listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
final int position, long id) {
String dir = Environment.getExternalStorageDirectory()
+ "/test/";
File fileDir = new File(dir);
if (!fileDir.exists()) {
fileDir.mkdirs();
}
String path = dir + adapter.getItem(position);
final File file = new File(path);
if (file.exists()) {
file.delete();
Log.i("delete", "original file deleted");
}
try {
new Thread(new Runnable() {
@Override
public void run() {
try {
// 参考/doc/manual.en.html，最后面的参数是监听器
client.download(adapter.getItem(position),
file, new MyTransferListener());
} catch (Exception e) {
e.printStackTrace();
}
}
}).start();
} catch (Exception e) {
e.printStackTrace();
}
}
});
}

public class MyTransferListener implements FTPDataTransferListener {
public void started() {
Log.i("download", "download start");
}

public void transferred(int length) {
Log.i("download", "have download " + length + " bytes");
}

public void completed() {
Log.i("download", "download completed");
}

public void aborted() {
Log.i("download", "download aborted");
}

public void failed() {
Log.i("download", "download failed");
}
}
}

4.权限

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
<uses-permission android:name="android.permission.CHANGE_WIFI_STATE" />
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />