[英]Can and How do you use RandomAccessFile with a file contained on an FTP server?
[英]How do you upload a file to an FTP server?
我创建了一个 function 来从我可以访问的 FTP 服务器下载文件。 如何将文件上传回 FTP 服务器?
下面是我使用的 download_files 方法:
public static void download_files(String un, String pw, String ip, String dir, String fn, String fp){
URLConnection con;
BufferedInputStream in = null;
FileOutputStream out = null;
try{
URL url = new URL("ftp://"+un+":"+pw+"@"+ip+"/"+dir+"/"+fn+";type=i");
con = url.openConnection();
in = new BufferedInputStream(con.getInputStream());
out = new FileOutputStream(fp+fn);
int i = 0;
byte[] bytesIn = new byte[1024];
while ((i = in.read(bytesIn)) >= 0) {
out.write(bytesIn, 0, i);
}
}catch(Exception e){
System.out.print(e);
e.printStackTrace();
System.out.println("Error while FTP'ing "+fn);
}finally{
try{
out.close();
in.close();
}catch(IOException e){
e.printStackTrace();
System.out.println("Error while closing FTP connection");
}
}
}
使用Apache Commons Net库中的FTPClient Class。
这是一个带有示例的片段:
FTPClient client = new FTPClient();
FileInputStream fis = null;
try {
client.connect("ftp.domain.com");
client.login("admin", "secret");
//
// Create an InputStream of the file to be uploaded
//
String filename = "Touch.dat";
fis = new FileInputStream(filename);
//
// Store file to server
//
client.storeFile(filename, fis);
client.logout();
} catch (IOException e) {
e.printStackTrace();
} finally {
try {
if (fis != null) {
fis.close();
}
client.disconnect();
} catch (IOException e) {
e.printStackTrace();
}
}
I have used the EDT FTP package, a free GPL library for FTP in Java: http://www.enterprisedt.com/products/edtftpj/overview.html
这是一个代码示例,来自他们提供的 Demo.java class:
ftp = new FTPClient();
ftp.setRemoteHost("hostname");
// connect
ftp.connect();
// login
ftp.login("user", "password");
// set up passive ASCII transfers
ftp.setConnectMode(FTPConnectMode.PASV);
ftp.setType(FTPTransferType.ASCII);
// get directory and print it to console
String[] files = ftp.dir(".", true);
for (int i = 0; i < files.length; i++)
log.debug(files[i]);
// copy file to server
ftp.put("test.txt", "test.txt");
// copy file from server
ftp.get("test.txt" + ".copy", "test.txt");
// delete file from server
ftp.delete("test.txt");
// Shut down client
ftp.quit();
检查FTP4J以及...
看看apache-commons-net他们有一些 FTP 工具可以帮助你!
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