The error treatment and abnormal situation of the SFTP Transport framework in the Java class library
The error treatment and abnormal situation of the SFTP Transport framework in the Java class library
SFTP Transport is a Java class library that is used to implement a SSH (Secure Shell) security file transmission protocol (SFTP) in the application.When using this framework, it is very important to deal with errors and abnormal conditions to ensure the reliability and stability of the application.This article will introduce some common techniques and best practices that deal with errors and abnormalities in the SFTP Transport framework, and provide some Java code examples.
1. The basics of abnormal treatment
Before dealing with errors and abnormalities, we need to understand the basic knowledge about the abnormal processing of Java.The abnormalities in Java are divided into two types: Check Exception and unattended exception.
-Thenicable abnormalities: These abnormalities are abnormalities during compilation. They must be explicitly processed in coding, including capture and processing abnormalities, or use Throws keywords in the method statement to spread the abnormality to the call party.
-Donivated abnormalities: These abnormalities are also called Runtime Exception. They are not required to be treated with abnormalities. It is usually caused by errors or logical errors that cannot be recovered.
2. Anomalial treatment
The SFTP Transport framework may throw a series of abnormalities in the process of connection, certification, file transmission, etc., such as connection timeout, server refusal connection, key verification failure, etc.The following are examples of some common abnormalities and error handling methods:
-Try-catch block: By using the TRY-CATCH block, it can capture and deal with possible abnormalities.The following is an example:
try {
// SFTP connection code
} catch (SftpException e) {
// Process SFTP abnormalities
} catch (JSchException e) {
// Treatment jsch abnormalities
}
-On abnormal communication: In the method statement, use THROWS keywords to spread the abnormality to the call party. If you don't want to deal with abnormalities in the current method, you can use this method.The following is an example:
public void connect() throws SftpException, JSchException {
// SFTP connection code
}
-Onomiconia record: After capturing abnormalities, you can record anomalous information in the log file for subsequent error analysis and debugging.The following is an example:
try {
// SFTP connection code
} catch (SftpException e) {
log.error ("sftp exception: {}", e.getMessage ());
} catch (JSchException e) {
log.error ("jsch abnormal: {}", e.getMessage ());
}
3. Solution of abnormal situations
In addition to basic abnormal treatment, some measures can also be taken to solve common abnormal conditions to improve the robustness and reliability of SFTP operations.
-Set timeout processing: Set the timeout of the connection to prevent long -term unspecked connections.The following is an example:
JSch jsch = new JSch();
Session session = jsch.getSession(username, hostname, port);
Session.settimeout (6000); // Set time is 6 seconds
session.connect();
-File transfer abnormal processing: During the file transmission, you can check the abnormal conditions during the transmission process and perform appropriate processing.The following is an example:
ChannelSftp channel = (ChannelSftp) session.openChannel("sftp");
channel.connect();
try {
channel.put(localFile, remoteFile);
} catch (SftpException e) {
// Process file transmission abnormalities
} finally {
channel.disconnect();
}
-The key verification failure processing: When the key verification is performed, the key may not match.This problem can be solved by capturing abnormalities and processing.The following is an example:
JSch jsch = new JSch();
jsch.addIdentity(privateKeyPath);
try {
session = jsch.getSession(username, hostname, port);
session.connect();
} catch (JSchException e) {
// Processing key verification failure abnormality
}
Through the above techniques and best practice, errors and abnormalities in the SFTP Transport framework can be better handled to ensure the reliability and stability of the application.In the development process, appropriate modifications and expansion can be performed according to specific needs to meet specific business scenarios.
