关于FTP匿名用户以及单文件FTP上传下载

匿名用户URL的写法

URL url = new URL("ftp://@192.168.30.190/xxx.pdf");

 

匿名用户使用sun.net.ftp.FtpClient连接的写法

    FtpClient ftpClient = new FtpClient();
    ftpClient.openServer("192.168.30.190", 21);
    ftpClient.login("anonymous", "");

    需要注意的是,由于是匿名用户,匿名用户的密码可为空,其实也可以任意输入,随便输一个就可以了

 

 

这里贴出FileUtil用于文件拷贝,考虑到会重用这部分代码,因此构建一个工具类

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class FileUtil {
  /**
   * 文件拷贝,通过对流的操作完成
   * 
   * @param insm
   * @param outsm
   * @throws IOException
   */
  public static void copyFile(InputStream insm, OutputStream outsm)
      throws IOException {
    BufferedInputStream bis = null;
    BufferedOutputStream bos = null;
    try {
      bis = new BufferedInputStream(insm);
      bos = new BufferedOutputStream(outsm);
      byte[] b = new byte[8192];
      int readBytes = -1;
      while ((readBytes = bis.read(b)) != -1) {
        bos.write(b, 0, readBytes);
      }
    } catch (IOException e) {
      e.printStackTrace();
      throw e;
    } finally {
      if (bis != null)
        bis.close();
      if (bos != null)
        bos.close();
    }
  }
}

 

 

   方法一:通过URL实现FTP文件上传

 

    //本地需要上传的文件
    File needToBeUpload = new File("E:\\References\\Java_Web开发总览.pdf");
    InputStream ins = new FileInputStream(needToBeUpload);
    URL url = new URL("ftp://@192.168.30.190/xxx.pdf");
    URLConnection conn = url.openConnection();
    OutputStream outs = conn.getOutputStream();
    FileUtil.copyFile(ins, outs);

 

   方法二:通过sun.net.ftp.FtpClient类实现FTP文件上传

 

    FtpClient ftpClient = new FtpClient();
    ftpClient.openServer("192.168.30.190", 21);
    ftpClient.login("anonymous", "anonymous");
    ftpClient.binary();
    TelnetOutputStream outs = ftpClient.put("xxx.pdf");
    FileUtil.copyFile(ins, outs);

   这里的匿名用户,密码可以为空,可以随便填写

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