java实现FTP多线程断点续传，上传下载！

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 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;  
    }  
      
   
    @Test
  
public void run() {
  // TODO Auto-generated method stub
   
         try {  
          this.connect(ftpURL, new java.lang.Integer(ftpport), username, pwd);
//           myFtp.ftpClient.makeDirectory(new String(" 电视剧".getBytes("GBK"),"iso-8859-1"));  
//           myFtp.ftpClient.changeWorkingDirectory(new String(" 电视剧".getBytes("GBK"),"iso-8859-1"));  
//           myFtp.ftpClient.makeDirectory(new String(" 走西口".getBytes("GBK"),"iso-8859-1"));  
//           System.out.println(myFtp.upload("http://www.5a520.cn /yw.flv", "/yw.flv",5));  
//           System.out.println(myFtp.upload("http://www.5a520.cn /走西口24.mp4","/央视走西口/新浪网/走西口 24.mp4"));  
          //   System.out.println(myFtp.download("/ 央视走西口/新浪网/走西口24.mp4", "E:\\走西口242.mp4"));
         
           this.download(file1, file2);
         //  System.out.println(myFtp.upload("c:\\a.iso", "/a.iso"));
             this.disconnect();  
         } catch (IOException e) {  
             System.out.println("连接FTP出错："+e.getMessage());  
         }  
}  
}