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

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