Java实现ftp上传文件、文件夹

Apache Commons Net 3.8.0 API工具包里有org.apache.commons.net.ftp.FTPClient; org.apache.commons.net.ftp.FTPReply; 来实现ftp客户端功能，简单易用。

API文档地址https://commons.apache.org/proper/commons-net/apidocs/overview-summary.html

范例：

    import java.io.File;
    import java.io.FileInputStream;
    import org.apache.commons.net.ftp.FTPClient;
    import org.apache.commons.net.ftp.FTPReply;

    public class test {

        private  FTPClient ftp;
        /**
         *
         * @param path 上传到ftp服务器哪个路径下
         * @param addr 地址
         * @param port 端口号
         * @param username 用户名
         * @param password 密码
         * @return
         * @throws Exception
         */
        private  boolean connect(String path,String addr,int port,String username,String password) throws Exception {
            boolean result = false;
            ftp = new FTPClient();
            int reply;
            ftp.connect(addr,port);
            ftp.login(username,password);
            ftp.setFileType(FTPClient.BINARY_FILE_TYPE);
            reply = ftp.getReplyCode();
            if (!FTPReply.isPositiveCompletion(reply)) {
                ftp.disconnect();
                return result;
            }
            ftp.changeWorkingDirectory(path);
            result = true;
            return result;
        }
        /**
         *
         * @param file 上传的文件或文件夹
         * @throws Exception
         */
        private void upload(File file) throws Exception{
            if(file.isDirectory()){
                ftp.makeDirectory(file.getName());
                ftp.changeWorkingDirectory(file.getName());
                String[] files = file.list();
                for (int i = 0; i < files.length; i++) {
                    File file1 = new File(file.getPath()+"\\"+files[i] );
                    if(file1.isDirectory()){
                        upload(file1);
                        ftp.changeToParentDirectory();
                    }else{
                        File file2 = new File(file.getPath()+"\\"+files[i]);
                        FileInputStream input = new FileInputStream(file2);
                        ftp.storeFile(file2.getName(), input);
                        input.close();
                    }
                }
            }else{
                File file2 = new File(file.getPath());
                FileInputStream input = new FileInputStream(file2);
                ftp.storeFile(file2.getName(), input);
                input.close();
            }
        }
       public static void main(String[] args) throws Exception{
          test t = new test();
          t.connect("", "localhost", 21, "yhh", "yhhazr");
          File file = new File("e:\\uploadify");
          t.upload(file);
       }
    }