java获取ftp文件路径怎么写

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  package com.weixin.util;
  
  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 com.weixin.constant.DownloadStatus;
  import com.weixin.constant.UploadStatus;
  
  /**
  * 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 ContinueFTP {
  public 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);
  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 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;
  }
  
  public static void main(String[] args) {
  ContinueFTP myFtp = new ContinueFTP();
  try {
  System.err.println(myFtp.connect("10.10.6.236", 21, "5", "jieyan"));
  // myFtp.ftpClient.makeDirectory(new String("歌曲".getBytes("GBK"),"iso-8859-1"));
  // myFtp.ftpClient.changeWorkingDirectory(new String("歌曲".getBytes("GBK"),"iso-8859-1"));
  // myFtp.ftpClient.makeDirectory(new String("爱你等于爱自己".getBytes("GBK"),"iso-8859-1"));
  // System.out.println(myFtp.upload("E:\\yw.flv", "/yw.flv",5));
  // System.out.println(myFtp.upload("E:\\爱你等于爱自己.mp4","/爱你等于爱自己.mp4"));
  //System.out.println(myFtp.download("/爱你等于爱自己.mp4", "E:\\爱你等于爱自己.mp4"));
  myFtp.disconnect();
  } catch (IOException e) {
  System.out.println("连接FTP出错:"+e.getMessage());
  }
  }
  }
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