[英]Multiple file downloads from SFTP using JSch failing with “Request queue: Unknown request issue”
我正在嘗試從FTP服務器下載多個文件。 當我只是將其放入for循環中時,它會很好地工作。 我不知道文件大小可能會有所不同,可能太小或太大。 因此,我正在使用執行程序服務下載它們。 通過執行程序放置下載功能時,出現請求隊列:未知請求問題。 請讓我知道我要去哪里錯了。
System.out.println("Connecting to FTP Server");
Session session = null;
ChannelSftp channelSftp = null;
JSch jsch = new JSch();
session = jsch.getSession(sftpUser,sftpHost,22);
session.setPassword(sftpPassword);
java.util.Properties config = new java.util.Properties();
config.put("StrictHostKeyChecking", "no");
session.setConfig(config);
session.connect();
System.out.println("Session Connected Status: "+session.isConnected());
Channel channel = session.openChannel("sftp");
channel.connect();
channelSftp = (ChannelSftp)channel;
System.out.println("Channel Connected Status: "+channelSftp.isConnected());
System.out.println("File: "+sourceFilePath);
if(channelSftp.isConnected())
{
String path = this.propertyManager.getValue("targetDirectoryPath");
channelSftp.cd(path);
Vector filelist = channelSftp.ls(path);
for(int i=0; i<filelist.size();i++)
{
LsEntry entry = (LsEntry) filelist.get(i);
String fileName = sourceFilePath + entry.getFilename();
destinationFilePath = ShipmentUtils.getDownloadPath(entry.getFilename());
System.err.println(entry.getFilename());
exec.execute(new FileDownloader(destinationFilePath, channelSftp.get(fileName)));
}
}
channelSftp.disconnect();
session.disconnect();
這是下載程序類
private class FileDownloader implements Runnable
{
String destinationFilePath;
InputStream stream;
public FileDownloader(String destinationFilePath , InputStream stream) {
this.destinationFilePath = destinationFilePath;
this.stream = stream;
}
@Override
public void run() {
byte[] buffer = new byte[1024];
BufferedOutputStream bos = null;
BufferedInputStream bis = null ;
try
{
bis = new BufferedInputStream(stream);
File newFile = new File(destinationFilePath);
OutputStream os = new FileOutputStream(newFile);
bos = new BufferedOutputStream(os);
int readCount=0;
while( (readCount = bis.read(buffer)) > 0) {
bos.write(buffer, 0, readCount);
}
}
catch (Exception e) {
e.printStackTrace();
}
finally {
try {
if(bis != null) bis.close();
if(bos != null) bos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
}
這是錯誤
java.io.IOException: error: 4: RequestQueue: unknown request id 1399811183
at com.jcraft.jsch.ChannelSftp$2.read(ChannelSftp.java:1406)
at java.io.BufferedInputStream.fill(Unknown Source)
at java.io.BufferedInputStream.read1(Unknown Source)
at java.io.BufferedInputStream.read(Unknown Source)
at java.io.FilterInputStream.read(Unknown Source)
at com.shipmentprocessing.network.FTPConnector$FileDownloader.run(FTPConnector.java:141)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
java.io.IOException: error
at com.jcraft.jsch.ChannelSftp$2.close(ChannelSftp.java:1505)
at java.io.BufferedInputStream.close(Unknown Source)
at com.shipmentprocessing.network.FTPConnector$FileDownloader.run(FTPConnector.java:150)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
雖然您可以使用一個SFTP連接/ JSch會話進行多次下載,但JSch會話絕對不是線程安全的。
因此,如果您需要運行單獨的線程進行下載,則必須為每個線程(在其中)打開新的連接。 這樣,您的下載性能也會更好。
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