java基于Apache FTP点断续传的文件上传和下载

package com.scengine.wtms.utils.ftp;  public enum UploadStatus {   File_Exits(0), Create_Directory_Success(1), Create_Directory_Fail(2), Upload_From_Break_Success(3), Upload_From_Break_Faild(4), Download_From_Break_Success(5), Download_From_Break_Faild(6), Upload_New_File_Success(7), Upload_New_File_Failed(8), Delete_Remote_Success(9), Delete_Remote_Faild(10),Remote_Bigger_Local(11),Remote_smaller_locall(12);    private int status;    public int getStatus()   {     return status;   }    public void setStatus(int status)   {     this.status = status;   }    UploadStatus(int status)   {     this.status = status;   } } 

package com.scengine.wtms.utils.ftp;  import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.PrintWriter; 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;  public class ContinueFTP {    private FTPClient ftpClient = new FTPClient();    /**    * 对象构造 设置将过程中使用到的命令输出到控制台    */   public ContinueFTP()   {     this.ftpClient.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out)));   }    /**    *    * java编程中用于连接到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);      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    *    * @param remote    *      远程文件路径    *    * @param local    *      本地文件路径    *    * @return 是否成功    *    * @throws IOException    */    @SuppressWarnings("resource")   public boolean download(String remote, String local) throws IOException   {      ftpClient.enterLocalPassiveMode();      ftpClient.setFileType(FTP.BINARY_FILE_TYPE);      boolean result;      File f = new File(local);      FTPFile[] files = ftpClient.listFiles(remote);      if (files.length != 1)     {       System.out.println("远程文件不唯一");       return false;     }      long lRemoteSize = files[0].getSize();      if (f.exists())     {       OutputStream out = new FileOutputStream(f, true);       System.out.println("本地文件大小为:" + f.length());        if (f.length() >= lRemoteSize)       {          System.out.println("本地文件大小大于远程文件大小，下载中止");          return false;        }        ftpClient.setRestartOffset(f.length());        result = ftpClient.retrieveFile(remote, out);        out.close();      } else     {        OutputStream out = new FileOutputStream(f);       result = ftpClient.retrieveFile(remote, out);       out.close();     }      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    *      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    */    @SuppressWarnings("resource")   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);      UploadStatus result;      // 对远程目录的处理      String remoteFileName = remote;      if (remote.contains("/"))     {        remoteFileName = remote.substring(remote.lastIndexOf("/") + 1);        String directory = remote.substring(0, remote.lastIndexOf("/") + 1);        if (!directory.equalsIgnoreCase("/") && !ftpClient.changeWorkingDirectory(directory))       {          // 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 = remote.substring(start, end);            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;            }          }        }      }      // 检查远程是否存在文件      FTPFile[] files = ftpClient.listFiles(remoteFileName);      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        InputStream is = new FileInputStream(f);        if (is.skip(remoteSize) == remoteSize)       {          ftpClient.setRestartOffset(remoteSize);          if (ftpClient.storeFile(remote, is))         {            return UploadStatus.Upload_From_Break_Success;          }        }        // 如果断点续传没有成功，则删除服务器上文件，重新上传        if (!ftpClient.deleteFile(remoteFileName))       {          return UploadStatus.Delete_Remote_Faild;        }        is = new FileInputStream(f);        if (ftpClient.storeFile(remote, is))       {          result = UploadStatus.Upload_New_File_Success;        } else       {          result = UploadStatus.Upload_New_File_Failed;        }        is.close();      } else     {        InputStream is = new FileInputStream(local);        if (ftpClient.storeFile(remoteFileName, is))       {          result = UploadStatus.Upload_New_File_Success;        } else       {          result = UploadStatus.Upload_New_File_Failed;        }        is.close();     }      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();     }    }    public static void main(String[] args)   {     ContinueFTP myFtp = new ContinueFTP();     try     {        myFtp.connect("192.168.1.200", 21, "duser", "HTPDuserXP32");        System.out.println(myFtp.upload("C://Users//Administrator//Desktop//swing.drawer.jar", "/jars/swing.drawer.jar"));        myFtp.disconnect();      } catch (IOException e)     {        System.out.println("连接FTP出错：" + e.getMessage());      }    }  }