使用java将文件从unix传输到windows
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transfer files from unix to windows using java
提问by user1585111
I want to get a file from unix system to my local system which is on windows using java. I'm very much new to this concept. Any ideas on how it could be done? Which is the best java API for this task?
我想从 unix 系统中获取一个文件到我的本地系统，该系统位于使用 java 的 Windows 上。我对这个概念很陌生。关于如何做到这一点的任何想法？哪个是此任务的最佳 Java API？
采纳答案by Zach M
I have found JSchto be very useful and straight foreword. Below is a snippet of code written to put all .txt files in a given folder on the sftp server.
我发现JSch是非常有用和直接的前言。下面是一段代码，用于将所有 .txt 文件放在 sftp 服务器上的给定文件夹中。
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); }
} );
}
回答by MGorgon
First thing that goes into my mind is FTP.
我首先想到的是FTP。
回答by Juned Ahsan
There are multiple choices to do that. First one simple socket communication between a java client and a server. If you want to go with this approach then follow this:
有多种选择可以做到这一点。第一个 Java 客户端和服务器之间的简单套接字通信。如果您想采用这种方法，请按照以下步骤操作：
http://mrbool.com/file-transfer-between-2-computers-with-java/24516
http://mrbool.com/file-transfer-between-2-computers-with-java/24516
Then there are other high level protocols implementations that can be used such as FTP, HTTP, etc
然后还有其他可以使用的高级协议实现，例如 FTP、HTTP 等
Follow a related SO post for java FTP client server: FTP client server model for file transfer in Java
遵循 Java FTP 客户端服务器的相关 SO 帖子：用于 Java文件传输的 FTP 客户端服务器模型
回答by laz
If the Unix machine supports SFTP, JSchis an option. You could adapt the following code to meet your needs:
如果 Unix 机器支持 SFTP，JSch是一个选项。您可以修改以下代码以满足您的需求：
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);
}
}
}
