[英]Comparing file size of downloaded file with remote file on ftp server
[英]Download File from remote Ftp Server (file downloaded empty)
我正在准備使用Java( FTPClient
)從遠程ftp服務器下載文件。 該文件已成功下載,但為空,我沒有找到解決我問題的方法
這是我的代碼
FTPClient ftpClient = new FTPClient();
try {
ftpClient.connect(ip, port);
ftpClient.login(user, pass);
ftpClient.enterLocalPassiveMode();
ftpClient.epsv();
ftpClient.mlsd();
File downloadFile = new File("contextFolder/test.txt");
OutputStream outputStream = new BufferedOutputStream(new FileOutputStream(downloadFile));
InputStream inputStream = ftpClient.retrieveFileStream(remoteFile);
byte[] bytesArray = new byte[4096];
int length;
//copy the file content in bytes
while ((length = inputStream.read(bytesArray)) > 0){
outputStream.write(bytesArray, 0, length);
}
Boolean success = ftpClient.completePendingCommand();
outputStream.close();
inputStream.close();
if (success) {
System.out.println("File "+remoteFile+" has been downloaded successfully.");
}
}catch(Exception ex){}
我需要將文件保存到名為test.txt的contextFolder中:)謝謝大家:)
這是我得到的例外
java.net.SocketException: Connection reset
at java.net.SocketInputStream.read(Unknown Source)
at java.net.SocketInputStream.read(Unknown Source)
at sun.nio.cs.StreamDecoder.readBytes(Unknown Source)
at sun.nio.cs.StreamDecoder.implRead(Unknown Source)
at sun.nio.cs.StreamDecoder.read(Unknown Source)
at java.io.InputStreamReader.read(Unknown Source)
at java.io.BufferedReader.fill(Unknown Source)
at java.io.BufferedReader.read(Unknown Source)
at org.apache.commons.net.io.CRLFLineReader.readLine(CRLFLineReader.java:58)
at org.apache.commons.net.ftp.FTP.__getReply(FTP.java:314)
at org.apache.commons.net.ftp.FTP.__getReply(FTP.java:294)
at org.apache.commons.net.ftp.FTP.sendCommand(FTP.java:483)
at org.apache.commons.net.ftp.FTP.sendCommand(FTP.java:556)
at org.apache.commons.net.ftp.FTP.sendCommand(FTP.java:605)
at org.apache.commons.net.ftp.FTP.pasv(FTP.java:956)
at org.apache.commons.net.ftp.FTPClient._openDataConnection_(FTPClient.java:806)
at org.apache.commons.net.ftp.FTPClient._retrieveFileStream(FTPClient.java:1853)
at org.apache.commons.net.ftp.FTPClient.retrieveFileStream(FTPClient.java:1844)
at com.ericsson.etl.module.Activity1.execute(Activity1.java:49)
at com.ericsson.etl.SequenceProcessor.doActivities(SequenceProcessor.java:130)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
您是否收到“文件XXX已下載”消息? 如果不是,則可能的原因是引發異常,並由此將其靜默丟棄:
} catch (Exception ex){}
您永遠都不應捕獲此類異常。
關閉它之前,請嘗試使用outputStream.flush()
。
如果那沒有幫助,您應該檢查try塊中是否通過ex.printStackTrace()
拋出了任何異常。 您經常在那里找到原因(例如,誤寫權限,連接錯誤等)。
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