package 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.net.MalformedURLException;
 
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 FtpUtils {
    // ftp伺服器地址
    public String hostname = "10.0.46.138";
    // ftp伺服器埠號預設為21
    public Integer port = 21;
    // ftp登入賬號
    public String username = "ftptest";
    // ftp登入密碼
    public String password = "ftptest";
 
    
 
public FTPClient ftpClient = null;
 
    /**
     * 初始化ftp伺服器
     */
    public void initFtpClient() {
        ftpClient = new FTPClient();
        ftpClient.setControlEncoding("utf-8");
        try {
            System.out.println("connecting...ftp伺服器:" + this.hostname + ":" + this.port);
            ftpClient.connect(hostname, port); 
 
// 連線ftp伺服器
            ftpClient.login(username, password); // 登入ftp伺服器
            int replyCode = ftpClient.getReplyCode(); // 是否成功登入伺服器
            if (!FTPReply.isPositiveCompletion(replyCode)) {
                System.out.println("connect failed...ftp伺服器:" + this.hostname + ":" + this.port);
            }else{
                System.out.println("connect successfu...ftp伺服器:" + this.hostname + ":" + this.port);
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
 
    /**
     * 上傳檔案
     * 
     * @param pathname
     *            ftp服務儲存地址
     * @param fileName
     *            上傳到ftp的檔名
     * @param originfilename
     *            待上傳檔案的名稱（絕對地址） *
     * @return
     */
    public boolean uploadFile(String pathname, String fileName, String originfilename) {
        InputStream inputStream = null;
        try {
            System.out.println("開始上傳檔案");
            inputStream = new FileInputStream(new File(originfilename));
            initFtpClient();
            ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
            CreateDirecroty(pathname);
            ftpClient.makeDirectory(pathname);
            ftpClient.changeWorkingDirectory(pathname);
            ftpClient.setControlEncoding("UTF-8");
            // 每次資料連線之前，ftp client告訴ftp server開通一個埠來傳輸資料
            ftpClient.enterLocalPassiveMode();
            // 觀察是否真的上傳成功
            boolean storeFlag = ftpClient.storeFile(fileName, inputStream);
            System.err.println("storeFlag==" + storeFlag);
            inputStream.close();
            ftpClient.logout();
            System.out.println("上傳檔案成功");
        } catch (Exception e) {
            System.out.println("上傳檔案失敗");
            e.printStackTrace();
        } finally {
            if (ftpClient.isConnected()) {
                try {
                    ftpClient.disconnect();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (null != inputStream) {
                try {
                    inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return true;
    }
 
    /**
     * 上傳檔案
     * 
     * @param pathname
     *            ftp服務儲存地址
     * @param fileName
     *            上傳到ftp的檔名
     * @param inputStream
     *            輸入檔案流
     * @return
     */
    public boolean uploadFile(String pathname, String fileName, InputStream inputStream) {
        try {
            System.out.println("開始上傳檔案");
            initFtpClient();
            ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
            CreateDirecroty(pathname);
            ftpClient.makeDirectory(pathname);
            ftpClient.changeWorkingDirectory(pathname);
            ftpClient.storeFile(fileName, inputStream);
            inputStream.close();
            ftpClient.logout();
            System.out.println("上傳檔案成功");
        } catch (Exception e) {
            System.out.println("上傳檔案失敗");
            e.printStackTrace();
        } finally {
            if (ftpClient.isConnected()) {
                try {
                    ftpClient.disconnect();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (null != inputStream) {
                try {
                    inputStream.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return true;
    }
 
    // 改變目錄路徑
    public boolean changeWorkingDirectory(String directory) {
        boolean flag = true;
        try {
            flag = ftpClient.changeWorkingDirectory(directory);
            if (flag) {
                System.out.println("進入資料夾" + directory + " 成功！");
 
            } else {
                System.out.println("進入資料夾" + directory + " 失敗！開始建立資料夾");
            }
        } catch (IOException ioe) {
            ioe.printStackTrace();
        }
        return flag;
    }
 
    // 建立多層目錄檔案，如果有ftp伺服器已存在該檔案，則不建立，如果無，則建立
    public boolean CreateDirecroty(String remote) throws IOException {
        boolean success = true;
        String directory = remote + "/";
        // 如果遠端目錄不存在，則遞迴建立遠端伺服器目錄
        if (!directory.equalsIgnoreCase("/") && !changeWorkingDirectory(new String(directory))) {
            int start = 0;
            int end = 0;
            if (directory.startsWith("/")) {
                start = 1;
            } else {
                start = 0;
            }
            end = directory.indexOf("/", start);
            String path = "";
            String paths = "";
            while (true) {
                String subDirectory = new String(remote.substring(start, end).getBytes("GBK"), "iso-8859-1");
                path = path + "/" + subDirectory;
                if (!existFile(path)) {
                    if (makeDirectory(subDirectory)) {
                        changeWorkingDirectory(subDirectory);
                    } else {
                        System.out.println("建立目錄[" + subDirectory + "]失敗");
                        changeWorkingDirectory(subDirectory);
                    }
                } else {
                    changeWorkingDirectory(subDirectory);
                }
 
                paths = paths + "/" + subDirectory;
                start = end + 1;
                end = directory.indexOf("/", start);
                // 檢查所有目錄是否建立完畢
                if (end <= start) {
                    break;
                }
            }
        }
        return success;
    }
 
    // 判斷ftp伺服器檔案是否存在
    public boolean existFile(String path) throws IOException {
        boolean flag = false;
        FTPFile[] ftpFileArr = ftpClient.listFiles(path);
        if (ftpFileArr.length > 0) {
            flag = true;
        }
        return flag;
    }
 
    // 建立目錄
    public boolean makeDirectory(String dir) {
        boolean flag = true;
        try {
            flag = ftpClient.makeDirectory(dir);
            if (flag) {
                System.out.println("建立資料夾" + dir + " 成功！");
 
            } else {
                System.out.println("建立資料夾" + dir + " 失敗！");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return flag;
    }
 
    /**
     * * 下載檔案 *
     * 
     * @param pathname
     *            FTP伺服器檔案目錄 *
     * @param filename
     *            檔名稱 *
     * @param localpath
     *            下載後的檔案路徑 *
     * @return
     */
    public boolean downloadFile(String pathname, String filename, String localpath) {
        boolean flag = false;
        OutputStream os = null;
        try {
            System.out.println("開始下載檔案");
            initFtpClient();
            // 切換FTP目錄
            boolean changeFlag = ftpClient.changeWorkingDirectory(pathname);
            System.err.println("changeFlag==" + changeFlag);
 
            ftpClient.enterLocalPassiveMode();
            ftpClient.setRemoteVerificationEnabled(false);
            // 檢視有哪些資料夾 以確定切換的ftp路徑正確
            String[] a = ftpClient.listNames();
            System.err.println(a[0]);
 
            FTPFile[] ftpFiles = ftpClient.listFiles();
            for (FTPFile file : ftpFiles) {
                if (filename.equalsIgnoreCase(file.getName())) {
                    File localFile = new File(localpath + "/" + file.getName());
                    os = new FileOutputStream(localFile);
                    ftpClient.retrieveFile(file.getName(), os);
                    os.close();
                }
            }
            ftpClient.logout();
            flag = true;
            System.out.println("下載檔案成功");
        } catch (Exception e) {
            System.out.println("下載檔案失敗");
            e.printStackTrace();
        } finally {
            if (ftpClient.isConnected()) {
                try {
                    ftpClient.disconnect();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
            if (null != os) {
                try {
                    os.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return flag;
    }
 
    /**
     * * 刪除檔案 *
     * 
     * @param pathname
     *            FTP伺服器儲存目錄 *
     * @param filename
     *            要刪除的檔名稱 *
     * @return
     */
    public boolean deleteFile(String pathname, String filename) {
        boolean flag = false;
        try {
            System.out.println("開始刪除檔案");
            initFtpClient();
            // 切換FTP目錄
            ftpClient.changeWorkingDirectory(pathname);
            ftpClient.dele(filename);
            ftpClient.logout();
            flag = true;
            System.out.println("刪除檔案成功");
        } catch (Exception e) {
            System.out.println("刪除檔案失敗");
            e.printStackTrace();
        } finally {
            if (ftpClient.isConnected()) {
                try {
                    ftpClient.disconnect();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
        return flag;
    }
 
    public static void main(String[] args) {
        FtpUtils ftp = new FtpUtils();
        // 檔案路徑寫為使用者建立時 指定的目錄
        //ftp.uploadFile("/home/ftptest/var/ftp/pub/test", "adt-bundle-windows-x86_64-20140702.rar", "E://chart/adt-bundle-windows-x86_64-20140702.rar");
        //ftp.downloadFile("/home/ftptest/var/ftp/pub/test", "hongmenci.png", "E://");
        ftp.deleteFile("/home/ftptest/var/ftp/pub/test", "adt-bundle-windows-x86_64-20140702.rar");
        //System.out.println("ok");
    }
}

 下載

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