我想使用Java将Unix系统中的文件传输到我的Windows本地系统上。对于这个概念,我还很陌生。有什么想法可以实现吗?哪个是最适合此任务的Java API?
private static final String USER_PROMPT = "Enter username@hostname:port";
private static final boolean USE_GUI = true;
public static void main(final String[] arg) {
Session session = null;
ChannelSftp channelSftp = null;
try {
final JSch jsch = new JSch();
final String defaultInput = System.getProperty("user.name") + "@localhost:22";
String input = (USE_GUI) ? JOptionPane.showInputDialog(USER_PROMPT, defaultInput) : System.console().readLine("%s (%s): ", USER_PROMPT, defaultInput);
if (input == null || input.trim().length() == 0) {
input = defaultInput;
}
final int indexOfAt = input.indexOf('@');
final int indexOfColon = input.indexOf(':');
final String user = input.substring(0, indexOfAt);
final String host = input.substring(indexOfAt + 1, indexOfColon);
final int port = Integer.parseInt(input.substring(indexOfColon + 1));
jsch.setKnownHosts("/path/to/known_hosts");
// if you have set up authorized_keys on the server, using that identitiy
// with the code on the next line allows for password-free, trusted connections
// jsch.addIdentity("/path/to/id_rsa", "id_rsa_password");
session = jsch.getSession(user, host, 22);
final UserInfo ui = new MyUserInfo();
session.setUserInfo(ui);
session.connect();
channelSftp = (ChannelSftp) session.openChannel("sftp");
channelSftp.connect();
channelSftp.get("/remotepath/remotefile.txt", "/localpath/localfile.txt");
} finally {
if (channelSftp != null) {
channelSftp.exit();
}
if (session != null) {
session.disconnect();
}
}
}
public static class MyUserInfo implements UserInfo {
private String password;
@Override
public String getPassword() {
return password;
}
@Override
public boolean promptYesNo(final String str) {
final Object[] options = {"yes", "no"};
final boolean yesNo = (USE_GUI) ? JOptionPane.showOptionDialog(null, str, "Warning", JOptionPane.DEFAULT_OPTION, JOptionPane.WARNING_MESSAGE, null, options, options[0]) == 0 : System.console().readLine("Enter y or n: ").equals("y");
return yesNo;
}
@Override
public String getPassphrase() {
return null;
}
@Override
public boolean promptPassphrase(final String message) {
return true;
}
@Override
public boolean promptPassword(final String message) {
if (!USE_GUI) {
password = new String(System.console().readPassword("Password: "));
return true;
} else {
final JTextField passwordField = new JPasswordField(20);
final Object[] ob = {passwordField};
final int result = JOptionPane.showConfirmDialog(null, ob, message, JOptionPane.OK_CANCEL_OPTION);
if (result == JOptionPane.OK_OPTION) {
password = passwordField.getText();
return true;
} else {
return false;
}
}
}
@Override
public void showMessage(final String message) {
if (!USE_GUI) {
System.console().printf(message);
} else {
JOptionPane.showMessageDialog(null, message);
}
}
}
我发现JSch非常实用和直接。以下是一段代码片段,用于将给定文件夹中的所有.txt文件放在SFTP服务器上。
public static void sftpConnection() {
// Object Declaration.
JSch jsch = new JSch();
Session session = null;
Channel channel = null;
// Variable Declaration.
String user = "foo";
String host = "10.9.8.7";
Integer port = 22;
String password = "test123";
String watchFolder = "\\localhost\textfiles";
String outputDir = "/remote/textFolder/";
String filemask = "*.txt";
try {
session = jsch.getSession(user, host, port);
/*
* StrictHostKeyChecking Indicates what to do if the server's host
* key changed or the server is unknown. One of yes (refuse connection),
* ask (ask the user whether to add/change the key) and no
* (always insert the new key).
*/
session.setConfig("StrictHostKeyChecking", "no");
session.setPassword(password);
session.connect();
channel = session.openChannel("sftp");
channel.connect();
ChannelSftp sftpChannel = (ChannelSftp)channel;
// Go through watch folder looking for files.
File[] files = findFile(watchFolder, filemask);
for(File file : files) {
// Upload file.
putFile(file, sftpChannel, outputDir);
}
} finally {
sftpChannel.exit();
session.disconnect();
}
}
public static void putFile(File file, ChannelSftp sftpChannel, String outputDir) {
FileInputStream fis = null;
try {
// Change to output directory.
sftpChannel.cd(outputDir);
// Upload file.
fis = new FileInputStream(file);
sftpChannel.put(fis, file.getName());
fis.close();
} catch{}
}
public static File[] findFile(String dirName, final String mask) {
File dir = new File(dirName);
return dir.listFiles(new FilenameFilter() {
public boolean accept(File dir, String filename)
{ return filename.endsWith(mask); }
} );
}
我脑海里首先想到的是FTP。