采用apache 的 commons-net-ftp-ftpclient
import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.PrintWriter; import java.io.RandomAccessFile; import org.apache.commons.net.PrintCommandListener; import org.apache.commons.net.ftp.FTP; import org.apache.commons.net.ftp.FTPClient; import org.apache.commons.net.ftp.FTPFile; import org.apache.commons.net.ftp.FTPReply; import org.junit.Test; /** *//** * 支持断点续传的FTP实用类 * @version 0.1 实现基本断点上传下载 * @version 0.2 实现上传下载进度汇报 * @version 0.3 实现中文目录创建及中文文件创建，添加对于中文的支持 */ public class ContinuedFTP{ //枚举类UploadStatus代码 public enum UploadStatus { Create_Directory_Fail, //远程服务器相应目录创建失败 Create_Directory_Success, //远程服务器闯将目录成功 Upload_New_File_Success, //上传新文件成功 Upload_New_File_Failed, //上传新文件失败 File_Exits, //文件已经存在 Remote_Bigger_Local, //远程文件大于本地文件 Upload_From_Break_Success, //断点续传成功 Upload_From_Break_Failed, //断点续传失败 Delete_Remote_Faild; //删除远程文件失败 } //枚举类DownloadStatus代码 public enum DownloadStatus { Remote_File_Noexist, //远程文件不存在 Local_Bigger_Remote, //本地文件大于远程文件 Download_From_Break_Success, //断点下载文件成功 Download_From_Break_Failed, //断点下载文件失败 Download_New_Success, //全新下载文件成功 Download_New_Failed; //全新下载文件失败 } public FTPClient ftpClient = new FTPClient(); private String ftpURL,username,pwd,ftpport,file1,file2; public ContinueFTP2(String _ftpURL,String _username,String _pwd,String _ftpport,String _file1,String _file2 ){ //设置将过程中使用到的命令输出到控制台 ftpURL = _ftpURL; username = _username; pwd = _pwd; ftpport = _ftpport; file1 = _file1; file2 = _file2; this.ftpClient.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out))); } /** *//** * 连接到FTP服务器 * @param hostname 主机名 * @param port 端口 * @param username 用户名 * @param password 密码 * @return 是否连接成功 * @throws IOException */ public boolean connect(String hostname,int port,String username,String password) throws IOException{ ftpClient.connect(hostname, port); ftpClient.setControlEncoding("GBK"); if(FTPReply.isPositiveCompletion(ftpClient.getReplyCode())){ if(ftpClient.login(username, password)){ return true; } } disconnect(); return false; } /** *//** * 从FTP服务器上下载文件,支持断点续传，上传百分比汇报 * @param remote 远程文件路径 * @param local 本地文件路径 * @return 上传的状态 * @throws IOException */ public DownloadStatus download(String remote,String local) throws IOException{ //设置被动模式 ftpClient.enterLocalPassiveMode(); //设置以二进制方式传输 ftpClient.setFileType(FTP.BINARY_FILE_TYPE); DownloadStatus result; //检查远程文件是否存在 FTPFile[] files = ftpClient.listFiles(new String(remote.getBytes("GBK"),"iso-8859-1")); if(files.length != 1){ System.out.println("远程文件不存在"); return DownloadStatus.Remote_File_Noexist; } long lRemoteSize = files[0].getSize(); File f = new File(local); //本地存在文件，进行断点下载 if(f.exists()){ long localSize = f.length(); //判断本地文件大小是否大于远程文件大小 if(localSize >= lRemoteSize){ System.out.println("本地文件大于远程文件，下载中止"); return DownloadStatus.Local_Bigger_Remote; } //进行断点续传，并记录状态 FileOutputStream out = new FileOutputStream(f,true); ftpClient.setRestartOffset(localSize); InputStream in = ftpClient.retrieveFileStream(new String(remote.getBytes("GBK"),"iso-8859-1")); byte[] bytes = new byte[1024]; long step = lRemoteSize /100; long process=localSize /step; int c; while((c = in.read(bytes))!= -1){ out.write(bytes,0,c); localSize+=c; long nowProcess = localSize /step; if(nowProcess > process){ process = nowProcess; if(process % 10 == 0) System.out.println("下载进度："+process); //TODO 更新文件下载进度,值存放在process变量中 } } in.close(); out.close(); boolean isDo = ftpClient.completePendingCommand(); if(isDo){ result = DownloadStatus.Download_From_Break_Success; }else { result = DownloadStatus.Download_From_Break_Failed; } }else { OutputStream out = new FileOutputStream(f); InputStream in= ftpClient.retrieveFileStream(new String(remote.getBytes("GBK"),"iso-8859-1")); byte[] bytes = new byte[1024]; long step = lRemoteSize /100; long process=0; long localSize = 0L; int c; while((c = in.read(bytes))!= -1){ out.write(bytes, 0, c); localSize+=c; long nowProcess = localSize /step; if(nowProcess > process){ process = nowProcess; if(process % 10 == 0) System.out.println("下载进度："+process); //TODO 更新文件下载进度,值存放在process变量中 } } in.close(); out.close(); boolean upNewStatus = ftpClient.completePendingCommand(); if(upNewStatus){ result = DownloadStatus.Download_New_Success; }else { result = DownloadStatus.Download_New_Failed; } } return result; } /** *//** * 上传文件到FTP服务器，支持断点续传 * @param local 本地文件名称，绝对路径 * @param remote 远程文件路径，使用/home/directory1/subdirectory/file.ext或是 http://www.guihua.org /subdirectory/file.ext 按照Linux上的路径指定方式，支持多级目录嵌套，支持递归创建不存在的目录结构 * @return 上传结果 * @throws IOException */ public UploadStatus upload(String local,String remote) throws IOException{ //设置PassiveMode传输 ftpClient.enterLocalPassiveMode(); //设置以二进制流的方式传输 ftpClient.setFileType(FTP.BINARY_FILE_TYPE); ftpClient.setControlEncoding("GBK"); UploadStatus result; //对远程目录的处理 String remoteFileName = remote; if(remote.contains("/")){ remoteFileName = remote.substring(remote.lastIndexOf("/")+1); //创建服务器远程目录结构，创建失败直接返回 if(CreateDirecroty(remote, ftpClient)==UploadStatus.Create_Directory_Fail){ return UploadStatus.Create_Directory_Fail; } } //检查远程是否存在文件 FTPFile[] files = ftpClient.listFiles(new String(remoteFileName.getBytes("GBK"),"iso-8859-1")); if(files.length == 1){ long remoteSize = files[0].getSize(); File f = new File(local); long localSize = f.length(); if(remoteSize==localSize){ return UploadStatus.File_Exits; }else if(remoteSize > localSize){ return UploadStatus.Remote_Bigger_Local; } //尝试移动文件内读取指针,实现断点续传 result = uploadFile(remoteFileName, f, ftpClient, remoteSize); //如果断点续传没有成功，则删除服务器上文件，重新上传 if(result == UploadStatus.Upload_From_Break_Failed){ if(!ftpClient.deleteFile(remoteFileName)){ return UploadStatus.Delete_Remote_Faild; } result = uploadFile(remoteFileName, f, ftpClient, 0); } }else { result = uploadFile(remoteFileName, new File(local), ftpClient, 0); } return result; } /** *//** * 断开与远程服务器的连接 * @throws IOException */ public void disconnect() throws IOException{ if(ftpClient.isConnected()){ ftpClient.disconnect(); } } /** *//** * 递归创建远程服务器目录 * @param remote 远程服务器文件绝对路径 * @param ftpClient FTPClient 对象 * @return 目录创建是否成功 * @throws IOException */ public UploadStatus CreateDirecroty(String remote,FTPClient ftpClient) throws IOException{ UploadStatus status = UploadStatus.Create_Directory_Success; String directory = remote.substring(0,remote.lastIndexOf("/")+1); if(!directory.equalsIgnoreCase("/")&&!ftpClient.changeWorkingDirectory(new String(directory.getBytes("GBK"),"iso-8859-1"))){ //如果远程目录不存在，则递归创建远程服务器目录 int start=0; int end = 0; if(directory.startsWith("/")){ start = 1; }else{ start = 0; } end = directory.indexOf("/",start); while(true){ String subDirectory = new String(remote.substring(start,end).getBytes("GBK"),"iso-8859-1"); if(!ftpClient.changeWorkingDirectory(subDirectory)){ if(ftpClient.makeDirectory(subDirectory)){ ftpClient.changeWorkingDirectory(subDirectory); }else { System.out.println("创建目录失败"); return UploadStatus.Create_Directory_Fail; } } start = end + 1; end = directory.indexOf("/",start); //检查所有目录是否创建完毕 if(end <= start){ break; } } } return status; } /** *//** * 上传文件到服务器,新上传和断点续传 * @param remoteFile 远程文件名，在上传之前已经将服务器工作目录做了改变 * @param localFile 本地文件 File句柄，绝对路径 * @param processStep 需要显示的处理进度步进值 * @param ftpClient FTPClient 引用 * @return * @throws IOException */ public UploadStatus uploadFile(String remoteFile,File localFile,FTPClient ftpClient,long remoteSize) throws IOException{ UploadStatus status; //显示进度的上传 long step = localFile.length() / 100; long process = 0; long localreadbytes = 0L; RandomAccessFile raf = new RandomAccessFile(localFile,"r"); OutputStream out = ftpClient.appendFileStream(new String(remoteFile.getBytes("GBK"),"iso-8859-1")); //断点续传 if(remoteSize>0){ ftpClient.setRestartOffset(remoteSize); process = remoteSize /step; raf.seek(remoteSize); localreadbytes = remoteSize; } byte[] bytes = new byte[1024]; int c; while((c = raf.read(bytes))!= -1){ out.write(bytes,0,c); localreadbytes+=c; if(localreadbytes / step != process){ process = localreadbytes / step; System.out.println("上传进度:" + process); //TODO 汇报上传状态 } } out.flush(); raf.close(); out.close(); boolean result =ftpClient.completePendingCommand(); if(remoteSize > 0){ status = result?UploadStatus.Upload_From_Break_Success:UploadStatus.Upload_From_Break_Failed; }else { status = result?UploadStatus.Upload_New_File_Success:UploadStatus.Upload_New_File_Failed; } return status; } }