Java实现FTP文件与文件夹的上传和下载
FTP 是File Transfer Protocol（文件传输协议）的英文简称，而中文简称为“文传协议”。用于Internet上的控制文件的双向传输。同时，它也是一个应用程序（Application）。基于不同的操作系统有不同的FTP应用程序，而所有这些应用程序都遵守同一种协议以传输文件。在FTP的使用当中，用户经常遇到两个概念："下载"（Download）和"上传"（Upload）。"下载"文件就是从远程主机拷贝文件至自己的计算机上；"上传"文件就是将文件从自己的计算机中拷贝至远程主机上。用Internet语言来说，用户可通过客户机程序向（从）远程主机上传（下载）文件。
首先下载了Serv-U将自己的电脑设置为了FTP文件服务器，方便操作。下面代码的使用都是在FTP服务器已经创建，并且要在代码中写好FTP连接的相关数据才可以完成。
1.FTP文件的上传与下载(注意是单个文件的上传与下载)
1 import java.io.File; 2 import java.io.FileInputStream; 3 import java.io.FileNotFoundException; 4 import java.io.FileOutputStream; 5 import java.io.IOException; 6 import java.io.InputStream; 7 import java.io.OutputStream; 8 9 import org.apache.commons.net.ftp.FTP; 10 import org.apache.commons.net.ftp.FTPClient; 11 import org.apache.commons.net.ftp.FTPFile; 12 import org.apache.commons.net.ftp.FTPReply; 13 14 /** 15 * 实现FTP文件上传和文件下载 16 */ 17 public class FtpApche { 18 private static FTPClient ftpClient = new FTPClient(); 19 private static String encoding = System.getProperty("file.encoding"); 20 /** 21 * Description: 向FTP服务器上传文件 22 * 23 * @Version1.0 24 * @param url 25 * FTP服务器hostname 26 * @param port 27 * FTP服务器端口 28 * @param username 29 * FTP登录账号 30 * @param password 31 * FTP登录密码 32 * @param path 33 * FTP服务器保存目录,如果是根目录则为“/” 34 * @param filename 35 * 上传到FTP服务器上的文件名 36 * @param input 37 * 本地文件输入流 38 * @return 成功返回true，否则返回false 39 */ 40 public static boolean uploadFile(String url, int port, String username, 41 String password, String path, String filename, InputStream input) { 42 boolean result = false; 43 44 try { 45 int reply; 46 // 如果采用默认端口，可以使用ftp.connect(url)的方式直接连接FTP服务器 47 ftpClient.connect(url); 48 // ftp.connect(url, port);// 连接FTP服务器 49 // 登录 50 ftpClient.login(username, password); 51 ftpClient.setControlEncoding(encoding); 52 // 检验是否连接成功 53 reply = ftpClient.getReplyCode(); 54 if (!FTPReply.isPositiveCompletion(reply)) { 55 System.out.println("连接失败"); 56 ftpClient.disconnect(); 57 return result; 58 } 59 60 // 转移工作目录至指定目录下 61 boolean change = ftpClient.changeWorkingDirectory(path); 62 ftpClient.setFileType(FTP.BINARY_FILE_TYPE); 63 if (change) { 64 result = ftpClient.storeFile(new String(filename.getBytes(encoding),"iso-8859-1"), input); 65 if (result) { 66 System.out.println("上传成功!"); 67 } 68 } 69 input.close(); 70 ftpClient.logout(); 71 } catch (IOException e) { 72 e.printStackTrace(); 73 } finally { 74 if (ftpClient.isConnected()) { 75 try { 76 ftpClient.disconnect(); 77 } catch (IOException ioe) { 78 } 79 } 80 } 81 return result; 82 } 83 84 /** 85 * 将本地文件上传到FTP服务器上 86 * 87 */ 88 public void testUpLoadFromDisk() { 89 try { 90 FileInputStream in = new FileInputStream(new File("D:/test02/list.txt")); 91 boolean flag = uploadFile("10.0.0.102", 21, "admin","123456", "/", "lis.txt", in); 92 System.out.println(flag); 93 } catch (FileNotFoundException e) { 94 e.printStackTrace(); 95 } 96 } 97 98 99 /** 100 * Description: 从FTP服务器下载文件 101 * 102 * @Version1.0 103 * @param url 104 * FTP服务器hostname 105 * @param port 106 * FTP服务器端口 107 * @param username 108 * FTP登录账号 109 * @param password 110 * FTP登录密码 111 * @param remotePath 112 * FTP服务器上的相对路径 113 * @param fileName 114 * 要下载的文件名 115 * @param localPath 116 * 下载后保存到本地的路径 117 * @return 118 */ 119 public static boolean downFile(String url, int port, String username, 120 String password, String remotePath, String fileName, 121 String localPath) { 122 boolean result = false; 123 try { 124 int reply; 125 ftpClient.setControlEncoding(encoding); 126 127 /* 128 * 为了上传和下载中文文件，有些地方建议使用以下两句代替 129 * new String(remotePath.getBytes(encoding),"iso-8859-1")转码。 130 * 经过测试，通不过。 131 */ 132 // FTPClientConfig conf = new FTPClientConfig(FTPClientConfig.SYST_NT); 133 // conf.setServerLanguageCode("zh"); 134 135 ftpClient.connect(url, port); 136 // 如果采用默认端口，可以使用ftp.connect(url)的方式直接连接FTP服务器 137 ftpClient.login(username, password);// 登录 138 // 设置文件传输类型为二进制 139 ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE); 140 // 获取ftp登录应答代码 141 reply = ftpClient.getReplyCode(); 142 // 验证是否登陆成功 143 if (!FTPReply.isPositiveCompletion(reply)) { 144 ftpClient.disconnect(); 145 System.err.println("FTP server refused connection."); 146 return result; 147 } 148 // 转移到FTP服务器目录至指定的目录下 149 ftpClient.changeWorkingDirectory(new String(remotePath.getBytes(encoding),"iso-8859-1")); 150 // 获取文件列表 151 FTPFile[] fs = ftpClient.listFiles(); 152 for (FTPFile ff : fs) { 153 if (ff.getName().equals(fileName)) { 154 File localFile = new File(localPath + "/" + ff.getName()); 155 OutputStream is = new FileOutputStream(localFile); 156 ftpClient.retrieveFile(ff.getName(), is); 157 is.close(); 158 } 159 } 160 161 ftpClient.logout(); 162 result = true; 163 } catch (IOException e) { 164 e.printStackTrace(); 165 } finally { 166 if (ftpClient.isConnected()) { 167 try { 168 ftpClient.disconnect(); 169 } catch (IOException ioe) { 170 } 171 } 172 } 173 return result; 174 } 175 176 /** 177 * 将FTP服务器上文件下载到本地 178 * 179 */ 180 public void testDownFile() { 181 try { 182 boolean flag = downFile("10.0.0.102", 21, "admin", 183 "123456", "/", "ip.txt", "E:/"); 184 System.out.println(flag); 185 } catch (Exception e) { 186 e.printStackTrace(); 187 } 188 } 189 190 public static void main(String[] args) { 191 FtpApche fa = new FtpApche(); 192 fa.testDownFile(); 193 fa.testUpLoadFromDisk(); 194 } 195 }
2.FTP文件夹的上传与下载(注意是整个文件夹)
1 package ftp; 2 3 import java.io.BufferedInputStream; 4 import java.io.BufferedOutputStream; 5 import java.io.File; 6 import java.io.FileInputStream; 7 import java.io.FileNotFoundException; 8 import java.io.FileOutputStream; 9 import java.io.IOException; 10 import java.util.TimeZone; 11 import org.apache.commons.net.ftp.FTPClient; 12 import org.apache.commons.net.ftp.FTPClientConfig; 13 import org.apache.commons.net.ftp.FTPFile; 14 import org.apache.commons.net.ftp.FTPReply; 15 16 import org.apache.log4j.Logger; 17 18 public class FTPTest_04 { 19 private FTPClient ftpClient; 20 private String strIp; 21 private int intPort; 22 private String user; 23 private String password; 24 25 private static Logger logger = Logger.getLogger(FTPTest_04.class.getName()); 26 27 /* * 28 * Ftp构造函数 29 */ 30 public FTPTest_04(String strIp, int intPort, String user, String Password) { 31 this.strIp = strIp; 32 this.intPort = intPort; 33 this.user = user; 34 this.password = Password; 35 this.ftpClient = new FTPClient(); 36 } 37 /** 38 * @return 判断是否登入成功 39 * */ 40 public boolean ftpLogin() { 41 boolean isLogin = false; 42 FTPClientConfig ftpClientConfig = new FTPClientConfig(); 43 ftpClientConfig.setServerTimeZoneId(TimeZone.getDefault().getID()); 44 this.ftpClient.setControlEncoding("GBK"); 45 this.ftpClient.configure(ftpClientConfig); 46 try { 47 if (this.intPort > 0) { 48 this.ftpClient.connect(this.strIp, this.intPort); 49 }else { 50 this.ftpClient.connect(this.strIp); 51 } 52 // FTP服务器连接回答 53 int reply = this.ftpClient.getReplyCode(); 54 if (!FTPReply.isPositiveCompletion(reply)) { 55 this.ftpClient.disconnect(); 56 logger.error("登录FTP服务失败！"); 57 return isLogin; 58 } 59 this.ftpClient.login(this.user, this.password); 60 // 设置传输协议 61 this.ftpClient.enterLocalPassiveMode(); 62 this.ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE); 63 logger.info("恭喜" + this.user + "成功登陆FTP服务器"); 64 isLogin = true; 65 }catch (Exception e) { 66 e.printStackTrace(); 67 logger.error(this.user + "登录FTP服务失败！" + e.getMessage()); 68 } 69 this.ftpClient.setBufferSize(1024 * 2); 70 this.ftpClient.setDataTimeout(30 * 1000); 71 return isLogin; 72 } 73 74 /** 75 * @退出关闭服务器链接 76 * */ 77 public void ftpLogOut() { 78 if (null != this.ftpClient && this.ftpClient.isConnected()) { 79 try { 80 boolean reuslt = this.ftpClient.logout();// 退出FTP服务器 81 if (reuslt) { 82 logger.info("成功退出服务器"); 83 } 84 }catch (IOException e) { 85 e.printStackTrace(); 86 logger.warn("退出FTP服务器异常！" + e.getMessage()); 87 }finally { 88 try { 89 this.ftpClient.disconnect();// 关闭FTP服务器的连接 90 }catch (IOException e) { 91 e.printStackTrace(); 92 logger.warn("关闭FTP服务器的连接异常！"); 93 } 94 } 95 } 96 } 97 98 /*** 99 * 上传Ftp文件 100 * @param localFile 当地文件 101 * @param romotUpLoadePath上传服务器路径 - 应该以/结束 102 * */ 103 public boolean uploadFile(File localFile, String romotUpLoadePath) { 104 BufferedInputStream inStream = null; 105 boolean success = false; 106 try { 107 this.ftpClient.changeWorkingDirectory(romotUpLoadePath);// 改变工作路径 108 inStream = new BufferedInputStream(new FileInputStream(localFile)); 109 logger.info(localFile.getName() + "开始上传....."); 110 success = this.ftpClient.storeFile(localFile.getName(), inStream); 111 if (success == true) { 112 logger.info(localFile.getName() + "上传成功"); 113 return success; 114 } 115 }catch (FileNotFoundException e) { 116 e.printStackTrace(); 117 logger.error(localFile + "未找到"); 118 }catch (IOException e) { 119 e.printStackTrace(); 120 }finally { 121 if (inStream != null) { 122 try { 123 inStream.close(); 124 }catch (IOException e) { 125 e.printStackTrace(); 126 } 127 } 128 } 129 return success; 130 } 131 132 /*** 133 * 下载文件 134 * @param remoteFileName 待下载文件名称 135 * @param localDires 下载到当地那个路径下 136 * @param remoteDownLoadPath remoteFileName所在的路径 137 * */ 138 139 public boolean downloadFile(String remoteFileName, String localDires, 140 String remoteDownLoadPath) { 141 String strFilePath = localDires + remoteFileName; 142 BufferedOutputStream outStream = null; 143 boolean success = false; 144 try { 145 this.ftpClient.changeWorkingDirectory(remoteDownLoadPath); 146 outStream = new BufferedOutputStream(new FileOutputStream( 147 strFilePath)); 148 logger.info(remoteFileName + "开始下载...."); 149 success = this.ftpClient.retrieveFile(remoteFileName, outStream); 150 if (success == true) { 151 logger.info(remoteFileName + "成功下载到" + strFilePath); 152 return success; 153 } 154 }catch (Exception e) { 155 e.printStackTrace(); 156 logger.error(remoteFileName + "下载失败"); 157 }finally { 158 if (null != outStream) { 159 try { 160 outStream.flush(); 161 outStream.close(); 162 }catch (IOException e) { 163 e.printStackTrace(); 164 } 165 } 166 } 167 if (success == false) { 168 logger.error(remoteFileName + "下载失败!!!"); 169 } 170 return success; 171 } 172 173 /*** 174 * @上传文件夹 175 * @param localDirectory 176 * 当地文件夹 177 * @param remoteDirectoryPath 178 * Ftp 服务器路径 以目录"/"结束 179 * */ 180 public boolean uploadDirectory(String localDirectory, 181 String remoteDirectoryPath) { 182 File src = new File(localDirectory); 183 try { 184 remoteDirectoryPath = remoteDirectoryPath + src.getName() + "/"; 185 boolean makeDirFlag = this.ftpClient.makeDirectory(remoteDirectoryPath); 186 System.out.println("localDirectory : " + localDirectory); 187 System.out.println("remoteDirectoryPath : " + remoteDirectoryPath); 188 System.out.println("src.getName() : " + src.getName()); 189 System.out.println("remoteDirectoryPath : " + remoteDirectoryPath); 190 System.out.println("makeDirFlag : " + makeDirFlag); 191 // ftpClient.listDirectories(); 192 }catch (IOException e) { 193 e.printStackTrace(); 194 logger.info(remoteDirectoryPath + "目录创建失败"); 195 } 196 File[] allFile = src.listFiles(); 197 for (int currentFile = 0;currentFile < allFile.length;currentFile++) { 198 if (!allFile[currentFile].isDirectory()) { 199 String srcName = allFile[currentFile].getPath().toString(); 200 uploadFile(new File(srcName), remoteDirectoryPath); 201 } 202 } 203 for (int currentFile = 0;currentFile < allFile.length;currentFile++) { 204 if (allFile[currentFile].isDirectory()) { 205 // 递归 206 uploadDirectory(allFile[currentFile].getPath().toString(), 207 remoteDirectoryPath); 208 } 209 } 210 return true; 211 } 212 213 /*** 214 * @下载文件夹 215 * @param localDirectoryPath本地地址 216 * @param remoteDirectory 远程文件夹 217 * */ 218 public boolean downLoadDirectory(String localDirectoryPath,String remoteDirectory) { 219 try { 220 String fileName = new File(remoteDirectory).getName(); 221 localDirectoryPath = localDirectoryPath + fileName + "//"; 222 new File(localDirectoryPath).mkdirs(); 223 FTPFile[] allFile = this.ftpClient.listFiles(remoteDirectory); 224 for (int currentFile = 0;currentFile < allFile.length;currentFile++) { 225 if (!allFile[currentFile].isDirectory()) { 226 downloadFile(allFile[currentFile].getName(),localDirectoryPath, remoteDirectory); 227 } 228 } 229 for (int currentFile = 0;currentFile < allFile.length;currentFile++) { 230 if (allFile[currentFile].isDirectory()) { 231 String strremoteDirectoryPath = remoteDirectory + "/"+ allFile[currentFile].getName(); 232 downLoadDirectory(localDirectoryPath,strremoteDirectoryPath); 233 } 234 } 235 }catch (IOException e) { 236 e.printStackTrace(); 237 logger.info("下载文件夹失败"); 238 return false; 239 } 240 return true; 241 } 242 // FtpClient的Set 和 Get 函数 243 public FTPClient getFtpClient() { 244 return ftpClient; 245 } 246 public void setFtpClient(FTPClient ftpClient) { 247 this.ftpClient = ftpClient; 248 } 249 250 public static void main(String[] args) throws IOException { 251 FTPTest_04 ftp=new FTPTest_04("10.0.0.102",21,"admin","123456"); 252 ftp.ftpLogin(); 253 System.out.println("1"); 254 //上传文件夹 255 boolean uploadFlag = ftp.uploadDirectory("D:\\test02", "/"); //如果是admin/那么传的就是所有文件，如果只是/那么就是传文件夹 256 System.out.println("uploadFlag : " + uploadFlag); 257 //下载文件夹 258 ftp.downLoadDirectory("d:\\tm", "/"); 259 ftp.ftpLogOut(); 260 } 261 }
原文地址：http://www.cnblogs.com/winorgohome/archive/2016/11/22/6088013.html
