Java使用FTPClient类读写FTP

袁鹤轩

2023-03-14

本文向大家介绍Java使用FTPClient类读写FTP，包括了Java使用FTPClient类读写FTP的使用技巧和注意事项，需要的朋友参考一下

本文实例为大家分享了Java使用FTPClient类读写FTP的具体代码，供大家参考，具体内容如下

1.首先先导入相关jar包

2.创建一个连接FTP的工具类FTPUtil.java

package com.metarnet.ftp.util; 
 
import java.io.IOException; 
import java.io.InputStream; 
import java.net.SocketException; 
import java.util.Properties; 
 
import org.apache.commons.net.ftp.FTPClient; 
import org.apache.commons.net.ftp.FTPReply; 
import org.apache.log4j.Logger; 
 
public class FTPUtil { 
  private static Logger logger = Logger.getLogger(FTPUtil.class); 
 
   
   
  /** 
   * 获取FTPClient对象 
   * @param ftpHost FTP主机服务器 
   * @param ftpPassword FTP 登录密码 
   * @param ftpUserName FTP登录用户名 
   * @param ftpPort FTP端口 默认为21 
   * @return 
   */ 
  public static FTPClient getFTPClient(String ftpHost, String ftpPassword, 
      String ftpUserName, int ftpPort) { 
    FTPClient ftpClient = null; 
    try { 
      ftpClient = new FTPClient(); 
      ftpClient.connect(ftpHost, ftpPort);// 连接FTP服务器 
      ftpClient.login(ftpUserName, ftpPassword);// 登陆FTP服务器 
      if (!FTPReply.isPositiveCompletion(ftpClient.getReplyCode())) { 
        logger.info("未连接到FTP，用户名或密码错误。"); 
        ftpClient.disconnect(); 
      } else { 
        logger.info("FTP连接成功。"); 
      } 
    } catch (SocketException e) { 
      e.printStackTrace(); 
      logger.info("FTP的IP地址可能错误，请正确配置。"); 
    } catch (IOException e) { 
      e.printStackTrace(); 
      logger.info("FTP的端口错误,请正确配置。"); 
    } 
    return ftpClient; 
  } 
}

3.编写一个读取FTP上文件的类ReadFTPFile.java

package com.metarnet.ftp.read; 
 
import java.io.BufferedReader; 
import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.io.IOException; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.net.SocketException; 
 
import org.apache.commons.net.ftp.FTPClient; 
import org.apache.log4j.Logger; 
 
import com.metarnet.ftp.util.FTPUtil; 
 
public class ReadFTPFile { 
  private Logger logger = Logger.getLogger(ReadFTPFile.class); 
 
  /** 
   * 去 服务器的FTP路径下上读取文件 
   * 
   * @param ftpUserName 
   * @param ftpPassword 
   * @param ftpPath 
   * @param FTPServer 
   * @return 
   */ 
  public String readConfigFileForFTP(String ftpUserName, String ftpPassword, 
      String ftpPath, String ftpHost, int ftpPort, String fileName) { 
    StringBuffer resultBuffer = new StringBuffer(); 
    FileInputStream inFile = null; 
    InputStream in = null; 
    FTPClient ftpClient = null; 
    logger.info("开始读取绝对路径" + ftpPath + "文件!"); 
    try { 
      ftpClient = FTPUtil.getFTPClient(ftpHost, ftpPassword, ftpUserName, 
          ftpPort); 
      ftpClient.setControlEncoding("UTF-8"); // 中文支持 
      ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE); 
      ftpClient.enterLocalPassiveMode(); 
      ftpClient.changeWorkingDirectory(ftpPath); 
      in = ftpClient.retrieveFileStream(fileName); 
    } catch (FileNotFoundException e) { 
      logger.error("没有找到" + ftpPath + "文件"); 
      e.printStackTrace(); 
      return "下载配置文件失败，请联系管理员."; 
    } catch (SocketException e) { 
      logger.error("连接FTP失败."); 
      e.printStackTrace(); 
    } catch (IOException e) { 
      e.printStackTrace(); 
      logger.error("文件读取错误。"); 
      e.printStackTrace(); 
      return "配置文件读取失败，请联系管理员."; 
    } 
    if (in != null) { 
      BufferedReader br = new BufferedReader(new InputStreamReader(in)); 
      String data = null; 
      try { 
        while ((data = br.readLine()) != null) { 
          resultBuffer.append(data + "\n"); 
        } 
      } catch (IOException e) { 
        logger.error("文件读取错误。"); 
        e.printStackTrace(); 
        return "配置文件读取失败，请联系管理员."; 
      }finally{ 
        try { 
          ftpClient.disconnect(); 
        } catch (IOException e) { 
          e.printStackTrace(); 
        } 
      } 
    }else{ 
      logger.error("in为空，不能读取。"); 
      return "配置文件读取失败，请联系管理员."; 
    } 
    return resultBuffer.toString(); 
  } 
}

4.创建一个往FTP上写入文件的类WriteFTPFile.java

package com.metarnet.ftp.write; 
 
import java.io.BufferedWriter; 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileWriter; 
import java.io.IOException; 
import java.io.InputStream; 
 
import org.apache.commons.net.ftp.FTPClient; 
import org.apache.commons.net.ftp.FTPFile; 
import org.apache.log4j.Logger; 
 
import com.metarnet.ftp.util.FTPUtil; 
 
public class WriteFTPFile { 
 
  private Logger logger = Logger.getLogger(WriteFTPFile.class); 
 
  /** 
   * 本地上传文件到FTP服务器 
   * 
   * @param ftpPath 
   *      远程文件路径FTP 
   * @throws IOException 
   */ 
  public void upload(String ftpPath, String ftpUserName, String ftpPassword, 
      String ftpHost, int ftpPort, String fileContent, 
      String writeTempFielPath) { 
    FTPClient ftpClient = null; 
    logger.info("开始上传文件到FTP."); 
    try { 
      ftpClient = FTPUtil.getFTPClient(ftpHost, ftpPassword, 
          ftpUserName, ftpPort); 
      // 设置PassiveMode传输 
      ftpClient.enterLocalPassiveMode(); 
      // 设置以二进制流的方式传输 
      ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE); 
      // 对远程目录的处理 
      String remoteFileName = ftpPath; 
      if (ftpPath.contains("/")) { 
        remoteFileName = ftpPath 
            .substring(ftpPath.lastIndexOf("/") + 1); 
      } 
      // FTPFile[] files = ftpClient.listFiles(new 
      // String(remoteFileName)); 
      // 先把文件写在本地。在上传到FTP上最后在删除 
      boolean writeResult = write(remoteFileName, fileContent, 
          writeTempFielPath); 
      if (writeResult) { 
        File f = new File(writeTempFielPath + "/" + remoteFileName); 
        InputStream in = new FileInputStream(f); 
        ftpClient.storeFile(remoteFileName, in); 
        in.close(); 
        logger.info("上传文件" + remoteFileName + "到FTP成功!"); 
        f.delete(); 
      } else { 
        logger.info("写文件失败!"); 
      } 
    } catch (Exception e) { 
      e.printStackTrace(); 
    }finally{ 
      try { 
        ftpClient.disconnect(); 
      } catch (IOException e) { 
        e.printStackTrace(); 
      } 
    } 
  } 
 
  /** 
   * 把配置文件先写到本地的一个文件中取 
   * 
   * @param ftpPath 
   * @param str 
   * @return 
   */ 
  public boolean write(String fileName, String fileContext, 
      String writeTempFielPath) { 
    try { 
      logger.info("开始写配置文件"); 
      File f = new File(writeTempFielPath + "/" + fileName); 
      if(!f.exists()){ 
        if(!f.createNewFile()){ 
          logger.info("文件不存在，创建失败!"); 
        } 
      } 
      BufferedWriter bw = new BufferedWriter(new FileWriter(f, true)); 
      bw.write(fileContext.replaceAll("\n", "\r\n")); 
      bw.flush(); 
      bw.close(); 
      return true; 
    } catch (Exception e) { 
      logger.error("写文件没有成功"); 
      e.printStackTrace(); 
      return false; 
    } 
  } 
}

5.建立一个测试类FTPMain.java

package com.metarnet.ftp.main; 
 
import java.io.InputStream; 
import java.util.Properties; 
 
import org.apache.log4j.Logger; 
 
import com.metarnet.ftp.read.ReadFTPFile; 
import com.metarnet.ftp.util.FTPUtil; 
import com.metarnet.ftp.write.WriteFTPFile; 
 
public class FTPMain { 
   
  private static Logger logger = Logger.getLogger(FTPMain.class); 
 
  public static void main(String[] args) { 
    int ftpPort = 0; 
    String ftpUserName = ""; 
    String ftpPassword = ""; 
    String ftpHost = ""; 
    String ftpPath = ""; 
    String writeTempFielPath = ""; 
    try { 
      InputStream in = FTPUtil.class.getClassLoader() 
          .getResourceAsStream("env.properties"); 
      if (in == null) { 
        logger.info("配置文件env.properties读取失败"); 
      } else { 
        Properties properties = new Properties(); 
        properties.load(in); 
        ftpUserName = properties.getProperty("ftpUserName"); 
        ftpPassword = properties.getProperty("ftpPassword"); 
        ftpHost = properties.getProperty("ftpHost"); 
        ftpPort = Integer.valueOf(properties.getProperty("ftpPort")) 
            .intValue(); 
        ftpPath = properties.getProperty("ftpPath"); 
        writeTempFielPath = properties.getProperty("writeTempFielPath"); 
         
        ReadFTPFile read = new ReadFTPFile(); 
        String result = read.readConfigFileForFTP(ftpUserName, ftpPassword, ftpPath, ftpHost, ftpPort, "huawei_220.248.192.200.cfg"); 
        System.out.println("读取配置文件结果为：" + result); 
         
        WriteFTPFile write = new WriteFTPFile(); 
        ftpPath = ftpPath + "/" + "huawei_220.248.192.200_new1.cfg"; 
        write.upload(ftpPath, ftpUserName, ftpPassword, ftpHost, ftpPort, result, writeTempFielPath); 
      } 
    } catch (Exception e) { 
      e.printStackTrace(); 
    } 
  } 
}

最后肯定是执行，看最后执行结果，OK步骤已讲完。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持小牛知识库。

Java使用FTPClient类读写FTP

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