今天工作用需要用到ftp上传整个文件，在网上查了资料一直报错，都困扰我一天了，代码如下：
package cn.lsh.test;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.StringTokenizer;

import sun.net.ftp.FtpClient;

public class FtpUtils {
private String ip="";
private String username="";
private String password ="";
private int port= -1;
private String path ="";
FtpClient ftpClient =null;
FileInputStream is =null;
OutputStream os = null;

public FtpUtils(String serverIP,String username,String password){
    this.ip =serverIP;
    this.username = username;
    this.password = password;
}
public FtpUtils(String serverIP,String username,String password,int port){
    this.ip =serverIP;
    this.username = username;
    this.password = password;
    this.port =port;
}
/*
 * 连接ftp服务器
 */
public boolean connectServer(){
    ftpClient = new FtpClient();
        try {
            if(this.port != -1){
                ftpClient.openServer(this.ip,this.port);
            }else{
                ftpClient.openServer(this.ip);
            }
            ftpClient.login(this.username, this.password);
            if(path.length() != 0){
                ftpClient.cd(path);
            }
            ftpClient.binary();
            System.out.println("已登录到\""+ftpClient.pwd() +"\"目录");
            return true;
        } catch (IOException e) {
            e.printStackTrace();
            return false;
        }
}
/*
 * 断开ftp服务器连接
 */
public boolean closeServer(){
    try{
        if(is != null){
            is.close();
        }
        if(os != null){
            os.close();
        }
        if(ftpClient != null){
            ftpClient.closeServer();
        }
        System.out.println("已从服务器断开连接");
        return true;
    }catch(IOException e){
        e.printStackTrace();
        return false;
    }
}
/*
 * 在当前目录下创建文件夹
 */
public boolean createDir(String dir){
    try{
        ftpClient.ascii();
        StringTokenizer s = new StringTokenizer(dir, "/");
        s.countTokens();
        String pathName = ftpClient.pwd();
        while(s.hasMoreElements()){
            pathName = pathName + "/" + (String)s.nextElement();
            try{
                ftpClient.sendServer("MKD"+pathName+"/n/r");
            }catch(Exception e){
                e =null;
                return false;
            }
            ftpClient.readServerResponse();
        }
        ftpClient.binary();
        return true;
    }catch(IOException e1){
        e1.printStackTrace();
        return false;
    }
}
//测试！！
public static void main(String[] args){
    FtpUtils ftp = new FtpUtils("127.0.0.1", "lsh", "lsh123");
    ftp.connectServer();
    ftp.createDir("testDir");
    ftp.closeServer();
}

}

报错信息：
已登录到"/"目录
sun.net.ftp.FtpProtocolException: TYPE I:500 '
TYPE I': command not understood.

at sun.net.ftp.FtpClient.issueCommandCheck(Unknown Source)
at sun.net.ftp.FtpClient.binary(Unknown Source)
at cn.lsh.test.FtpUtils.createDir(FtpUtils.java:94)
at cn.lsh.test.FtpUtils.main(FtpUtils.java:105)

已从服务器断开连接

我要是把
ftpClient.sendServer("MKD"+pathName+"\n\r");改成
ftpClient.sendServer("MKD"+pathName+"/n/r");
程序运行很长时间，最后报socket错误！

我也是崩溃了！

Rmarkdown，总是出现这种情况，如图所示，如何解决，请各位大神看看

xiaoli123yangxin

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