FTP文件上传下载

    /**
     * 从FTP下载文件
     */
    public static boolean downFileFroFTP(String url, int port, String username,
            String password, String remotePath, String fileName,
            String localPath) {
        FTPClient ftpClient = new FTPClient();
        String encoding = System.getProperty("file.encoding");
        boolean result = false;
        try {
            int reply;
            ftpClient.setControlEncoding(encoding);            
            ftpClient.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
            ftpClient.login(username, password);// 登录
            // 设置文件传输类型为二进制
            ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
            // 获取ftp登录应答代码
            reply = ftpClient.getReplyCode();
            // 验证是否登陆成功
            if (!FTPReply.isPositiveCompletion(reply)) {
                ftpClient.disconnect();
                System.err.println("FTP server refused connection.");
                return result;
            }
            System.out.println(remotePath);
            ftpClient.sendCommand("OPTS UTF8", "ON");
            // 转移到FTP服务器目录至指定的目录下
            ftpClient.changeWorkingDirectory(new String(remotePath
                    .getBytes(encoding), "UTF-8"));
            // 获取文件列表
            FTPFile[] fs = ftpClient.listFiles();
                
            for (FTPFile ff : fs) {
                if (ff.getName().equals(fileName)) {
                    File localFile = new File(localPath + "/" + ff.getName());
                    System.out.println("文件名是："+localFile.getName());
                    OutputStream is = new FileOutputStream(localFile);
                    ftpClient.retrieveFile(ff.getName(), is);
                    is.close();
                }
            }
            ftpClient.logout();
            result = true;
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (ftpClient.isConnected()) {
                try {
                    ftpClient.disconnect();
                } catch (IOException ioe) {
                }
            }
        }
        return result;
    }

    /**
     * Description: 向FTP服务器上传文件
     * 
     */
    public static boolean uploadFile(String url, int port, String username,
            String password, String path, String filename, InputStream input) {
        FTPClient ftpClient = new FTPClient();
        String encoding = System.getProperty("file.encoding");
        boolean result = false;
        try {
            int reply;
            // 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
            ftpClient.connect(url);
            // 登录
            ftpClient.login(username, password);
            ftpClient.setControlEncoding(encoding);
            // 检验是否连接成功
            reply = ftpClient.getReplyCode();
            if (!FTPReply.isPositiveCompletion(reply)) {
                System.out.println("连接失败");
                ftpClient.disconnect();
                return result;
            }
                
            // 转移工作目录至指定目录不成功，创建该目录
            if(!ftpClient.changeWorkingDirectory(path)){
                ftpClient.makeDirectory(path);
            }        
            ftpClient.changeWorkingDirectory(path);
            ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
            ftpClient.sendCommand("OPTS UTF8", "ON");            
            String filenameNew = new String(filename.getBytes(encoding),"ISO-8859-1");                        

            // 获取文件列表 
            FTPFile[] fs = ftpClient.listFiles();
            int len=fs.length;
            String[] fnArr=new String[len];
            for (int i=0;i<len;i++){
                fnArr[i]=fs[i].getName();
            }
            boolean isContain=useList(fnArr,filename);
            if (isContain) {
                System.out.println("该文件已经存在！！");
            }else{
                result = ftpClient.storeFile(filenameNew, input);
            }            
            input.close();
            ftpClient.logout();
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (ftpClient.isConnected()) {
                try {
                    ftpClient.disconnect();
                } catch (IOException ioe) {
                    ioe.printStackTrace();
                }
            }
        }
        return result;
    }
    
    public static boolean useList(String[] arr,String targetValue){
        return Arrays.asList(arr).contains(targetValue);
    }

downFileFroFTP("192.168.x.xxx", 21, "xxxxxx", "xxxxx", path,filename, savePath);
flag = uploadFile("192.168.x.xxx", 21, "xxxxxx", "xxxxx", path, filenameNew, input)