JAVA使用FTP实现文件传输

2024-01-29 12:36| 来源: 网络整理| 查看: 265

1.FTP是文件传输协议，可以用来搭建文件服务器，供客户端对文件进行上传和下载的操作

2.JAVA中可以使用commons-net.jar的包，实现对FTP的操作

3.下面是小栗子

commons-net commons-net 3.6

4.源码：

package edu.net.ftp; import org.apache.commons.net.ftp.FTPClient; import org.apache.commons.net.ftp.FTPClientConfig; import org.apache.commons.net.ftp.FTPFile; import org.apache.commons.net.ftp.FTPReply; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import java.util.Objects; /** * FTP实例 */ public class FTPDemo { public static void main(String[] args) { String server = "localhost"; String username = "caohonghua"; String password = "******"; FTPClient ftpClient = null; try { ftpClient = getFTPClient(server, username, password); System.out.println(ftpClient.getReplyString()); if (!FTPReply.isPositiveCompletion(ftpClient.getReplyCode())) { System.err.println("连接FTP服务器失败！"); System.exit(1); } //获取当前工作空间 String cwd = ftpClient.printWorkingDirectory(); System.out.println(cwd); System.out.println("--------------"); //列出当前路径下的文件及其文件夹 for (FTPFile ftpFile : ftpClient.listFiles()) { System.out.println(ftpFile.toString()); } System.out.println("--------------"); //上传文件 String source = "/tmp/test"; String dest = cwd; System.out.println(upload(ftpClient, source, dest)); //下载文件 source = "/Users/caohonghua/downloadTest"; dest = "/tmp/downloadTest"; System.out.println(download(ftpClient, source, dest)); } catch (Exception e) { e.printStackTrace(); } finally { if (Objects.nonNull(ftpClient)) { try { ftpClient.logout(); ftpClient.disconnect(); } catch (IOException e) { e.printStackTrace(); } } } } private static boolean download(FTPClient ftpClient, String source, String dest) { boolean flag = false; try (OutputStream outputStream = Files.newOutputStream(Paths.get(dest))) { flag = ftpClient.retrieveFile(source, outputStream); } catch (Exception e) { e.printStackTrace(); } return flag; } private static boolean upload(FTPClient ftpClient, String source, String dest) { boolean flag = false; Path path = Paths.get(source); try (InputStream inputStream = Files.newInputStream(path)) { ftpClient.changeWorkingDirectory(dest); flag = ftpClient.storeFile(path.getFileName().toString(), inputStream); } catch (Exception e) { e.printStackTrace(); } return flag; } private static FTPClient getFTPClient(String server, String username, String password) throws IOException { FTPClient ftpClient = new FTPClient(); FTPClientConfig config = new FTPClientConfig(); config.setServerTimeZoneId("Asia/Shanghai"); ftpClient.configure(config); ftpClient.connect(server); ftpClient.login(username, password); return ftpClient; } } 5.记录：storeFile 存储文件（上传）retrieveFile取回文件（下载）

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