Android和FTP服務器交互下載文件（實測成功）

woff

代碼

1. private Boolean downloadAndSaveFile(String server, int portNumber,String user, String password, String filename, File localFile) throws IOException {
   
2. FTPClient ftp = null;
   
3. 
   
4. try {
   
5.     ftp = new FTPClient();
   
6.     ftp.connect(server, portNumber);
   
7.     Log.d(LOG_TAG, "Connected. Reply: " + ftp.getReplyString());
   
8. 
   
9.     ftp.login(user, password);
   
10.     Log.d(LOG_TAG, "Logged in");
    
11.     ftp.setFileType(FTP.BINARY_FILE_TYPE);
    
12.     Log.d(LOG_TAG, "Downloading");
    
13.     ftp.enterLocalPassiveMode();
    
14. 
    
15.     OutputStream outputStream = null;
    
16.     boolean success = false;
    
17.     try {
    
18.         outputStream = new BufferedOutputStream(new FileOutputStream(
    
19.                 localFile));
    
20.         success = ftp.retrieveFile(filename, outputStream);
    
21.     } finally {
    
22.         if (outputStream != null) {
    
23.             outputStream.close();
    
24.         }
    
25.     }
    
26. 
    
27.     return success;
    
28. } finally {
    
29.     if (ftp != null) {
    
30.         ftp.logout();
    
31.         ftp.disconnect();
    
32.     }
    
33. }
    
34. }

複製代碼

如果是用暱名
user = "anonymous"

password=""


Android Studio build.gradle 加入

1. dependencies {
   
2.     compile fileTree(include: ['*.jar'], dir: 'libs')
   
3.     testCompile 'junit:junit:4.12'
   
4.     compile 'com.android.support:appcompat-v7:23.4.0'
   
5.     compile 'commons-net:commons-net:3.6'
   
6. }

複製代碼

下載時別忘了用 Thread

需要的Jar包下载地址：https://commons.apache.org/proper/commons-net/download_net.cgi
目前版本是：commons-net-3.6-bin.zip        


參考文章：https://stackoverflow.com/questi ... r-to-android-device