ftp 断点上传、下载demo

package com.ftp; 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 ContinueFTP2 implements Runnable{ //枚举类UploadStatus代码 public ContinueFTP2() { } 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