apache ftp 上传文件的时候，拔断网线，重新插入网线，删除传输异常的文件，提示文件被占用。只能重启FTP服务才能正常删除

[lizhey314]

apache ftp 上传文件的时候，拔断网线，重新插入网线，删除传输异常的文件，提示文件被占用。只能重启FTP服务才能正常删除。

是ftp断网的时候我哪里没有释放流吗？在线求各位大佬解答！

代码如下：

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;  

import com.synball.turbodx.component.file.remote.FtpListener;
  
public class ContinueFTP {  
    private FTPClient ftpClient = new FTPClient();  
      
    public ContinueFTP(){  
        //设置将过程中使用到的命令输出到控制台  
        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);  
        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 
     */  
    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 
     */  
    public String 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);   
        //对远程目录的处理  
        String remoteFileName = remote; 
        String result;
        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 "";  
                        }  
                    }  
                      
                    start = end + 1;  
                    end = directory.indexOf("/",start);  
                      
                    //检查所有目录是否创建完毕  
                    if(end <= start){  
                        break;  
                    }  
                }  
            }  
        }  
    	//监听
//    	FtpListener listener = new FtpListener(null,0,remoteFileName);
//        ftpClient.setCopyStreamListener(listener.createListener());
        //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 "File_Exits";  
            }else if(remoteSize > localSize){  
                return "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 "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 "Delete_Remote_Faild";  
            }  
            is = new FileInputStream(f);  
            if(ftpClient.storeFile(remote, is)){      
                result = "Upload_New_File_Success";  
            }else{  
                result = "Upload_New_File_Failed";  
            }  
            is.close();  
        }else {  
            InputStream is = new FileInputStream(local);  
            if(ftpClient.storeFile(remoteFileName, is)){  
                result = "Upload_New_File_Success";  
            }else{  
                result = "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("192.168.1.15", 21, "hadoop", "hadoop");  
            System.out.println(myFtp.upload("E:\\files\\csv\\31.zip", "/server/31.zip"));  
            myFtp.disconnect();  
        } catch (IOException e) {  
            System.out.println("连接FTP出错："+e.getMessage());  
        }  
    }  
}  

[lizhey314]

大侠们，给点指导性的意见。在线求