java实现FTP多线程断点续传,上传下载
java实现FTP多线程断点续传,上传下载
李茂冉 发表于2年前
java实现FTP多线程断点续传,上传下载
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摘要: java实现FTP多线程断点续传,上传下载的示例

代码示例:

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());   
         }   
 }   
} 
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五娃
怎么调用啊?
Thread tr =new Thread(new ContinueFTP2("192.168.128.125", "xxx", "xxxx", "21", "xxxxx.jpg", "xxxx"));
tr.start();
然后就没反应了?对线程不了解
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