JAVA中使用FTPClient实现文件上传下载

/**
* Description: 向FTP服务器上传文件
* @Version1.0 Jul 27, 2008 4:31:09 PM by 崔红保（cuihongbao@d-heaven.com）创建
* @param url FTP服务器hostname
* @param port FTP服务器端口
* @param username FTP登录账号
* @param password FTP登录密码
* @param path FTP服务器保存目录
* @param filename 上传到FTP服务器上的文件名
* @param input 输入流
* @return 成功返回true，否则返回false
*/ 
publicstaticboolean uploadFile(String url,int port,String username, String password, String path, String filename, InputStream input) { 
    boolean success = false; 
    FTPClient ftp = new FTPClient(); 
    try { 
        int reply; 
        ftp.connect(url, port);//连接FTP服务器 
        //如果采用默认端口，可以使用ftp.connect(url)的方式直接连接FTP服务器 
        ftp.login(username, password);//登录 
        reply = ftp.getReplyCode(); 
        if (!FTPReply.isPositiveCompletion(reply)) { 
            ftp.disconnect(); 
            return success; 
        } 
        ftp.changeWorkingDirectory(path); 
        ftp.storeFile(filename, input);          
         
        input.close(); 
        ftp.logout(); 
        success = true; 
    } catch (IOException e) { 
        e.printStackTrace(); 
    } finally { 
        if (ftp.isConnected()) { 
            try { 
                ftp.disconnect(); 
            } catch (IOException ioe) { 
            } 
        } 
    } 
    return success; 
}

/**
     * Description: 向FTP服务器上传文件
     * @Version1.0 Jul 27, 2008 4:31:09 PM by 崔红保（cuihongbao@d-heaven.com）创建
     * @param url FTP服务器hostname
     * @param port FTP服务器端口
     * @param username FTP登录账号
     * @param password FTP登录密码
     * @param path FTP服务器保存目录
     * @param filename 上传到FTP服务器上的文件名
     * @param input 输入流
     * @return 成功返回true，否则返回false
     */
    public static boolean uploadFile(String url,int port,String username, String password, String path, String filename, InputStream input) {
        boolean success = false;
        FTPClient ftp = new FTPClient();
        try {
            int reply;
            ftp.connect(url, port);//连接FTP服务器
            //如果采用默认端口，可以使用ftp.connect(url)的方式直接连接FTP服务器
            ftp.login(username, password);//登录
            reply = ftp.getReplyCode();
            if (!FTPReply.isPositiveCompletion(reply)) {
                ftp.disconnect();
                return success;
            }
            ftp.changeWorkingDirectory(path);
            ftp.storeFile(filename, input);            
            
            input.close();
            ftp.logout();
            success = true;
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (ftp.isConnected()) {
                try {
                    ftp.disconnect();
                } catch (IOException ioe) {
                }
            }
        }
        return success;
    }

@Test 
publicvoid testUpLoadFromDisk(){ 
    try { 
        FileInputStream in=new FileInputStream(new File("D:/test.txt")); 
        boolean flag = uploadFile("127.0.0.1", 21, "test", "test", "D:/ftp", "test.txt", in); 
        System.out.println(flag); 
    } catch (FileNotFoundException e) { 
        e.printStackTrace(); 
    } 
}

@Test
    public void testUpLoadFromDisk(){
        try {
            FileInputStream in=new FileInputStream(new File("D:/test.txt"));
            boolean flag = uploadFile("127.0.0.1", 21, "test", "test", "D:/ftp", "test.txt", in);
            System.out.println(flag);
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }

@Test 
publicvoid testUpLoadFromString(){ 
    try { 
        InputStream input = new ByteArrayInputStream("test ftp".getBytes("utf-8")); 
        boolean flag = uploadFile("127.0.0.1", 21, "test", "test", "D:/ftp", "test.txt", input); 
        System.out.println(flag); 
    } catch (UnsupportedEncodingException e) { 
        e.printStackTrace(); 
    } 
}

@Test
    public void testUpLoadFromString(){
        try {
            InputStream input = new ByteArrayInputStream("test ftp".getBytes("utf-8"));
            boolean flag = uploadFile("127.0.0.1", 21, "test", "test", "D:/ftp", "test.txt", input);
            System.out.println(flag);
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
    }

/**
* Description: 从FTP服务器下载文件
* @Version1.0 Jul 27, 2008 5:32:36 PM by 崔红保（cuihongbao@d-heaven.com）创建
* @param url FTP服务器hostname
* @param port FTP服务器端口
* @param username FTP登录账号
* @param password FTP登录密码
* @param remotePath FTP服务器上的相对路径
* @param fileName 要下载的文件名
* @param localPath 下载后保存到本地的路径
* @return
*/ 
publicstaticboolean downFile(String url, int port,String username, String password, String remotePath,String fileName,String localPath) { 
    boolean success = false; 
    FTPClient ftp = new FTPClient(); 
    try { 
        int reply; 
        ftp.connect(url, port); 
        //如果采用默认端口，可以使用ftp.connect(url)的方式直接连接FTP服务器 
        ftp.login(username, password);//登录 
        reply = ftp.getReplyCode(); 
        if (!FTPReply.isPositiveCompletion(reply)) { 
            ftp.disconnect(); 
            return success; 
        } 
        ftp.changeWorkingDirectory(remotePath);//转移到FTP服务器目录 
        FTPFile[] fs = ftp.listFiles(); 
        for(FTPFile ff:fs){ 
            if(ff.getName().equals(fileName)){ 
                File localFile = new File(localPath+"/"+ff.getName()); 
                 
                OutputStream is = new FileOutputStream(localFile);  
                ftp.retrieveFile(ff.getName(), is); 
                is.close(); 
            } 
        } 
         
        ftp.logout(); 
        success = true; 
    } catch (IOException e) { 
        e.printStackTrace(); 
    } finally { 
        if (ftp.isConnected()) { 
            try { 
                ftp.disconnect(); 
            } catch (IOException ioe) { 
            } 
        } 
    } 
    return success; 
}