我正在尝试创建一个支持ftp和sftp协议的ftp客户端。我有两种方法startFTP()用于ftp，startSFTP()用于sftp。连接参数从配置文件加载。
当我点击执行两种方法之一的按钮时，所有JButton，JCombobox都停留，菜单保持不变，并且在FTP客户端方法执行时无法点击，我无法停止或退出程序。
这是我的代码：
import com.jcraft.jsch.Channel;
import com.jcraft.jsch.ChannelSftp;
import com.jcraft.jsch.ChannelSftp.LsEntry;
import com.jcraft.jsch.JSch;
import com.jcraft.jsch.JSchException;
import com.jcraft.jsch.Session;
import com.jcraft.jsch.SftpException;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.PrintStream;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Iterator;
import java.util.Properties;
import java.util.Vector;
import static javafx.application.Platform.exit;
import javax.swing.JTextArea;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;
public class FtpInfo {
static Properties props;
static String outmsg = null;
/**
* @return the outmsg
*/
public String getOutmsg() {
return outmsg;
}
public boolean startFTP(String chooseddate, String serverAddresss, String userIdd, String passwordd, String remoteDirectoryy, String localDirectoryy) {
try {
outmsg = " APPLICATION" + "\n" + "=====================" + "\n";
String serverAddress = serverAddresss;
String userId = userIdd;
String password = passwordd;
String remoteDirectory = remoteDirectoryy;
String localDirectory = localDirectoryy;
//new ftp client
FTPClient ftp = new FTPClient();
//try to connect
ftp.connect(serverAddress);
//login to server
if (!ftp.login(userId, password)) {
System.out.println("Login failed! Please check login and password.");
outmsg += "- Error: Login failed! Please check login and password.";
ftp.logout();
return false;
}
int reply = ftp.getReplyCode();
//FTPReply stores a set of constants for FTP reply codes.
if (!FTPReply.isPositiveCompletion(reply)) {
ftp.disconnect();
System.out.println("Error: Connexion failed!");
outmsg += "- Error: Connexion failed!" + "\n";
return false;
}
//enter passive mode
ftp.enterLocalPassiveMode();
//get system name
System.out.println("Remote system is " + ftp.getSystemType() + "\n");
//change current directory
ftp.changeWorkingDirectory(remoteDirectory);
System.out.println("Current directory is " + ftp.printWorkingDirectory());
outmsg += "Remote system is " + ftp.getSystemType() + "\n";
outmsg += "- Output: Remote directory is \"" + ftp.printWorkingDirectory() + "\"\n";
outmsg += "- Output: Local directory is \"" + localDirectory + "\"\n";
//get list of filenames
FTPFile[] ftpFiles = ftp.listFiles();
outmsg += "--------------------------------------------------------------------------------------------------------------------------------\n";
if (ftpFiles != null && ftpFiles.length > 0) {
//loop through files
for (FTPFile file : ftpFiles) {
SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
if (!file.isFile() || !sdf.format(file.getTimestamp().getTime()).equals(chooseddate)) {
continue;
}
System.out.println("File is " + file.getName() + "\n" + sdf.format(file.getTimestamp().getTime()) + "=>" + sdf.format(new Date().getTime()));
//get output stream
OutputStream output;
output = new FileOutputStream(localDirectory + "/" + file.getName());
//get the file from the remote system
ftp.retrieveFile(file.getName(), output);
//close output stream
outmsg += "- Output: File name => \"" + file.getName() + "\" And Last modified date => \"" + sdf.format(file.getTimestamp().getTime()) + " \"\n";
output.close();
outmsg += "--------------------------------------------------------------------------------------------------------------------------------\n";
//delete the file
//ftp.deleteFile(file.getName());
}
}
ftp.logout();
ftp.disconnect();
exit();
} catch (Exception ex) {
return false;
}
return true;
}
public void startSFTP(String cchooseddate, String sserverAddresss, String uuserIdd, String ppasswordd, String rremoteDirectoryy, String llocalDirectoryy) throws JSchException, SftpException {
outmsg = " APPLICATION" + "\n" + "=====================" + "\n";
String remote_dir = rremoteDirectoryy;
String local_dir = llocalDirectoryy;
String[] files = {};
files = "*".split(",");
JSch jsch = new JSch();
Session session = jsch.getSession(uuserIdd, sserverAddresss);
session.setConfig("StrictHostKeyChecking", "no");
session.setPassword(ppasswordd);
session.connect();
Channel channel = session.openChannel("sftp");
channel.connect();
ChannelSftp sftpChannel = (ChannelSftp) channel;
sftpChannel.cd(remote_dir);
outmsg += "Connexion..." + "\n";
for (int i = 0; i < files.length; i++) {
String filename = files[i].trim();
Vector<ChannelSftp.LsEntry> list = sftpChannel.ls(filename);
Iterator<LsEntry> itr = list.iterator();
while (itr.hasNext()) {
ChannelSftp.LsEntry ls = (ChannelSftp.LsEntry) itr.next();
try {
filename = ls.getFilename();
SimpleDateFormat sdf2 = new SimpleDateFormat("dd/MM/yyyy");
String lastModif = sftpChannel.lstat(filename).getMtimeString();
DateFormat parser = new SimpleDateFormat("EEE MMM dd HH:mm:ss zzzz yyyy");
DateFormat formatter = new SimpleDateFormat("dd/MM/yyyy");
String lastModified = formatter.format(parser.parse(lastModif));
System.out.println(filename + " " + lastModified);
if (!filename.isEmpty() && lastModified.equals(cchooseddate)) {
sftpChannel.get(filename, local_dir + filename);
System.out.println("- " + "\"" + remote_dir + "/" + filename + "\" " + " copied."+ "\n");
outmsg += "- " + "\"" + remote_dir + filename + "\" " + " copied."+ "\n";
}
} catch (Exception e) {
System.out.println(remote_dir + filename + " not transfered!");
outmsg += "- " + remote_dir + filename + " not transfered!"+ "\n";
System.err.println("Caught IOException: " + e.getMessage());
}
}
}
sftpChannel.exit();
session.disconnect();
}
}
答案 0 :(得分：3)
对于长时间运行的任务，您必须在GUI线程上执行它们，即在后台线程上执行它们。否则它会占用你的GUI，正如你在这里遇到的那样。
看一下SwingWorker课程。请参阅以下答案：