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
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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
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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
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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
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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服务器之家。
