如果文件上传失败,那么在使用JSCH API进行SFTP时如何进行多次尝试? 如何确保文件上传成功? 如何创建线程安全的文件上传实用程序?
答案 0 :(得分:1)
创建一个可以从外部类调用的公共静态实用程序方法。此方法有一个map参数来保存sFTPUser,sFTPHost,sFTPPort,sFTPPwd,destinationLocation和uploadedFileName的值:
public static void doSFTP(Map<String, String> ftpParameters) {
if (ftpParameters.get("ID_NAME").equals(
NAPSCommonConstants.MFT_NAPSGPCS_INTF)) {
// do sftp for NAPS GPCS Interface.
uploadUsingSFTP(ftpParameters);
}
}
使用synchronized方法确保线程安全:
private static synchronized void uploadUsingSFTP(
Map<String, String> ftpPrameterList) {
new SFTPUtility().uploadFileMFT(ftpPrameterList.get("sFTPUser"),
ftpPrameterList.get("sFTPHost"), new Integer(ftpPrameterList
.get("sFTPPort")), ftpPrameterList.get("sFTPPwd"),
ftpPrameterList.get("sourceLocation"), ftpPrameterList
.get("destinationLocation"), ftpPrameterList
.get("uploadedFileName"));
}
使用SFTP上传文件的负责任的方法,尝试5次:
private void uploadFileMFT(String sFTPUser, String sFTPHost, int sFTPPort,
String sFTPPwd, String sourceLocation, String destinationLocation,
String uploadedFileName) {
LOG.info("Inside uploadFileMFT to upload and verify the file.");
JSch jsch = new JSch();
Vector<String> fileList = null;
/** 5 re-attempt logic to get session */
int attempts = 0;
boolean successfulConnect;
do {
try {
successfulConnect = true;
session = jsch.getSession(sFTPUser, sFTPHost, sFTPPort);
LOG.debug("session connected ...");
session.setPassword(sFTPPwd);
Properties config = new Properties();
config.put("StrictHostKeyChecking", "no");
session.setConfig(config);
session.connect();
LOG.debug("Sftp Session connected ...");
channel = session.openChannel("sftp");
LOG.debug("Sftp Channel opened ...");
channelSftp = (ChannelSftp) channel;
channelSftp.connect();
LOG.info(" Sftp channel opened and connected ...");
channelSftp.put(sourceLocation, destinationLocation);
fileList = channelSftp.ls(destinationLocation);
} catch (JSchException e) {
++attempts;
successfulConnect = false;
LOG.error(e);
} catch (SftpException e) {
++attempts;
successfulConnect = false;
LOG.error(e);
} finally {
if (null != channelSftp) {
channelSftp.exit();
LOG.debug(" sftp Channel exited.");
}
if (null != channel) {
channel.disconnect();
LOG.debug(" Channel disconnected.");
}
if (null != session) {
session.disconnect();
LOG.debug(" Host Session disconnected.");
}
}
} while (attempts < 5 && successfulConnect == false);
fileUploadValidation(fileList, uploadedFileName);
LOG.info("Exiting from method - uploadFileMFT ...");
}
最后上传的文件可以验证:
private void fileUploadValidation (Vector<String> fileList, String uploadedFileName){
boolean isFileExistis = false;
Object[] objArr = fileList.toArray();
for (int i = 0; i < objArr.length; i++) {
String fileName = objArr[i].toString();
isFileExistis = fileName.contains(uploadedFileName);
if (isFileExistis) {
LOG.info("Uploaded file '" + uploadedFileName + "' was transferred successfull ...");
break;
}else if(i >= objArr.length){
LOG.info("Uploaded file '" + uploadedFileName + "' was failed to transfer ...");
}
}
}