1. 获取FTP连接
/**
* 获取FTP连接
*
* @param hostname FTP IP地址
* @param port FTP端口号
* @param username FTP用户名
* @param password FTP密码
* @return
*/
public static FTPClient getFTPClient(final String hostname, final int port, final String username,
final String password) {
log.info("get ftpClient hostname=" + hostname + ", port=" + port + ", username=" + username);
FTPClient ftpClient = null;
final FTPClientConfig config = new FTPClientConfig();
config.setHost(hostname);
config.setPort(port);
config.setUsername(username);
config.setPassword(password);
config.setEncoding(ScanConstant.ENCODING_UTF_8);
factory = new FTPClientFactory(config);
try {
pool = new FTPClientPool(factory);
ftpClient = pool.borrowObject();
} catch (final Exception e1) {
log.error("FTP连接池异常", e1);
}
// 设置缓冲区
ftpClient.setBufferSize(BUFFER_SIZE);//之前没有加这一项，总是获取失败
try {
if (FTPReply.isPositiveCompletion(ftpClient.sendCommand("OPTS UTF8", "ON"))) {
// 开启服务器对UTF-8的支持，如果服务器支持就用UTF-8编码，否则就使用本地编码（GBK）.
LOCAL_CHARSET = "UTF-8";
}
} catch (final IOException e1) {
throw new FtpException("Set sendCommand UTF8 failed.");
}
// 设置编码
ftpClient.setControlEncoding(LOCAL_CHARSET);
// 设置被动模式
ftpClient.enterLocalPassiveMode();
try {
// 设置文件传输类型
ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
} catch (final IOException e) {
throw new FtpException("Fail to set file Type.");
}
try {
ftpClient.setConnectTimeout(60000);
} catch (final Exception e) {
throw new FtpException("Set client timeout error.");
}
log.info("return ftpClient " + ftpClient);
return ftpClient;
}2. 上传文件
public static boolean uploadFile(final String hostname, final int port, final String username,
final String password, final String fileName, final String path, final InputStream in) {
//fileName：文件名称 path：文件所在目录 in：文件输入流boolean success = false; final FTPClient ftpClient = getFTPClient(hostname, port, username, password); // 获取绝对路径 final String absPath = path; log.info("FTP 上传文件中。。。fileName=" + fileName); try { // 创建文件目录 createDirectory(ftpClient, absPath); // 更改目录 ftpClient.changeWorkingDirectory(absPath); success = ftpClient.storeFile(new String(fileName.getBytes("UTF-8"), "ISO-8859-1"), in); if (!success) { log.info("failed to upload file."); } } catch (final IOException e) { log.error("failed to upload file.", e); } finally { if (in != null) { try { in.close(); } catch (final IOException e) { log.error("failed to close inputStream.", e); } } if (ftpClient != null) { disconnec(ftpClient); } } log.info("FTP文件上传结束。"); return success; }
3. 下载文件
/**
* @param hostname FTP IP
* @param port FTP端口
* @param username FTP用户名
* @param password FTP 密码
* @param ftpPath FTP服务器中文件所在路径 格式： ftptest/aa/a.txt
*/
public static boolean downloadFile(final String hostname, final int port, final String username,
final String password, final String ftpPath, final HttpServletResponse response,
final String scanFileName) {
log.info("to download file from FTP： " + ftpPath);
boolean downloaded = false;
FTPClient ftpClient = null;
OutputStream outputStream = null;
try {
outputStream = response.getOutputStream();
response.reset();
response.setCharacterEncoding(ScanConstant.ENCODING_UTF_8);
response.setContentType("application/octet-stream");
response.addHeader("Content-Disposition",
"attachment;filename=" + URLEncoder.encode(scanFileName, "UTF-8"));
ftpClient = getFTPClient(hostname, port, username, password);
downloaded = ftpClient.retrieveFile(
new String(ftpPath.getBytes("UTF-8"), "IOS-8859-1"), outputStream);
outputStream.flush();
} catch (final IOException e) {
log.error("download file failed! ftpFile = " + ftpPath + "/" + ftpPath, e);
} finally {
if (outputStream != null) {
try {
outputStream.close();
} catch (final IOException e) {
log.error("failed to close outputStream!", e);
}
}
if (ftpClient != null) {
disconnec(ftpClient);
}
}
log.info("downloaded file from FTP!");
return downloaded;
}
4. 关闭连接
public static void disconnec(final FTPClient ftpClient) {
log.info("断开ftp连接： " + ftpClient);
try {
ftpClient.logout();
} catch (final IOException e) {
log.error("ftp failed to log out from server.", e);
} finally {
if (ftpClient.isConnected()) {
try {
ftpClient.disconnect();
} catch (final IOException e) {
log.error("Failed to disconnect from server.", e);
}
}
}
log.info("ftp断开连接成功!");
}
获取项目路径
System.getProperty("user.dir")
5. 判断文件是否存在
/**
* 检验指定路径的文件是否存在ftp服务器中
* @param filePath--指定绝对路径的文件
* @return
*/
public static boolean isFTPFileExist(final String hostname, final int port, final String username,
final String password, final String filePath) {
log.info("判断文件在ftp上是否存在！");
boolean exists = false;
final FTPClient ftpClient = FtpForSoftScan.getFTPClient(hostname, port, username, password);
try {
final FTPFile[] files = ftpClient.listFiles(new String(filePath.getBytes("UTF-8"), "ISO-8859-1"));
if (files != null && files.length > 0) {
exists = true;
}
} catch (final IOException e) {
log.error("failed to judge whether the file (" + filePath + ") is existed");
}
log.info("文件" + filePath + "在ftp上是否存在?" + exists);
return exists;
}
6. 删除文件
public static boolean deleteFile (final String hostname, final int port, final String username,
final String password, final String ftpPath) {
if (ftpPath != null && ftpPath != "") {
final FTPClient ftpClient = getFTPClient(hostname, port, username, password);
if (ftpPath.endsWith("/")) {
log.info("错误的文件路径");
return false;
}
try {
final boolean exists = isFTPFileExist(hostname, port, username, password, ftpPath);
if (exists) {
ftpClient.deleteFile(new String(ftpPath.getBytes(ScanConstant.ENCODING_UTF_8), ScanConstant.SERVER_CHARSET_IOS));
} else {
log.info("文件" + ftpPath + "已经不存在");
return true;
}
} catch (IOException e) {
log.error("FTP上文件删除失败！", e);
return false;
}
} else {
log.info("没有需要删除的文件！");
}
return true;
}