javaFtp上传文件名编码格式 - 《Java 专栏》

图1：FileZilla配置信息"> 图1：FileZilla配置信息

转https://blog.csdn.net/dhu86380/article/details/102064930
http://www.linuxidc.com/Linux/2014-10/107585.htm

传输编码必须为 ISO-8859-1
内容编码根据服务器支持匹配

最近在做文件服务器的相关东西，在原有的磁盘存储的基础上，增加了Ftp的存储方式，客户端选用的是Apache的FtpClient。今天在测试的时候，发现中文的路径后者文件名不支持，查阅了相关资料后终于找到了解决的方法。
使用类：
org.apache.commons.net.ftp.FTPClient
问题描述：
创建中文目录、上传中文文件名时，目录名及文件名中的中文显示乱码
解决方法：
在网上Google了一些资料， FTP协议里面，规定文件名编码为iso-8859-1，所以目录名或文件名需要转码。
所以网上很多人的解决方法为：
将中文的目录或文件名转为iso-8859-1编码的字符。参考代码：
String name=”目录名或文件名”;
name=new String(name.getBytes(“GBK”),”iso-8859-1”);
很多人改为上述操作后，发现上传后中文不再乱码了，就以为解决了问题
还有人处理方法为：
ftpClient.setControlEncoding(“GBK”);
FTPClientConfig conf = new FTPClientConfig(FTPClientConfig.SYST_NT);
conf.setServerLanguageCode(“zh”);
上述的处理方法，我都试过，发现在我自己搭建的FTP服务器上，上传的文件中文是正常的，不是乱码，我当时以为中文问题就解决了，但是测试部的同事在将文件上传到他们搭建的FTP服务器上时，文件中文路径仍然是乱码，所以上述的解决方法是错误的。
上面的方法之所以错误的原因是因为是没有考虑ftp服务器的编码格式。我搭建的Ftp服务器（windows2003 server）支持GBK编码方式，所以上述的解决方法可以，但是测试部的同事搭建的Ftp服务器（serv-u）是支持UTF-8格式的，所以此时在客户端的编码方式是GBK的，而搭设的ftp服务器中的设置就已经是utf-8的编码，所以肯定还是会出现乱码的问题。
那么正确的解决方法时是什么呢，我们可以仿照FlashFXP、FileZilla等ftp 客户端连接工具，看看他们是如何实现的，下面的两张图就是FileZilla的配置信息和连接时的命令信息。

图1：FileZilla配置信息

       <br />                                                                                    **图2：FileZilla连接时信息**<br />**从图2中我们可以看到原来它向服务器发送了OPTS UTF8 ON命令，来开启服务器对UTF-8的支持。所以我们也可以仿照**FileZilla**那样向服务器发送该命令。如果服务器支持UTF-8我们就用UTTF-8，否则我们就用本地编码（GBK）来处理中文文件名。**<br />**下面是Java代码：**<br />/** 本地字符编码 */<br />private static String LOCAL_CHARSET = "GBK";<br /> <br />// FTP协议里面，规定文件名编码为iso-8859-1<br />private static String SERVER_CHARSET = "ISO-8859-1";<br /> <br />private void connectFtpServer() {<br />if (ftpClient == null) {<br />ftpClient = new FTPClient();<br />}<br />if (ftpClient.isConnected()) {<br />return;<br />}<br />String host = getConfigValue(ADDRESS);<br />int port = Integer.valueOf(getConfigValue(PORT));<br />String user = getConfigValue(USER);<br />String password = getConfigValue(PASSWORD);<br />try {<br />ftpClient.connect(host, port);<br />if (FTPReply.isPositiveCompletion(ftpClient.getReplyCode())) {<br />if (ftpClient.login(user, password)) {<br />if (FTPReply.isPositiveCompletion(ftpClient.sendCommand(<br />"OPTS UTF8", "ON"))) {// 开启服务器对UTF-8的支持，如果服务器支持就用UTF-8编码，否则就使用本地编码（GBK）.<br />LOCAL_CHARSET = "UTF-8";<br />}<br />ftpClient.setControlEncoding(LOCAL_CHARSET);<br />ftpClient.enterLocalPassiveMode();// 设置被动模式<br />ftpClient.setFileType(getTransforModule());// 设置传输的模式<br />return;<br />} else {<br />throw new FileStorageException(<br />"Connet ftpServer error! Please check user or password");<br />}<br />}<br />} catch (IOException e) {<br />disConnectServer();<br />throw new FileStorageException(<br />"Connet ftpServer error! Please check the Configuration");<br />}<br />}<br />上传文件时，文件名称需要做编码转换<br />fileName = new String(fileName.getBytes(LOCAL_CHARSET),<br />SERVER_CHARSET);<br />通过上述方法，就能解决了中文乱码的问题。

package com.toyor.utils;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import org.apache.commons.lang.StringUtils;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPReply;

import javax.servlet.http.HttpServletRequest;
import java.io.;
import java.net.SocketException;
import java.util.ArrayList;
import java.util.Arrays;
*import java.util.List;

public class FtpUtil {
//qzf ftp
private static String ueditorDir = “ueditor”;
private static String localCharSet = “GBK”;
private static String serverCharSet = “ISO-8859-1”;
/*
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 ftpUserName,
String ftpPassword, int ftpPort) {
FTPClient ftpClient = new FTPClient();
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())) {
System.out.println(“未连接到FTP，用户名或密码错误。”);
ftpClient.disconnect();
} else {
System.out.println(“FTP连接成功。”);
}
} catch (SocketException e) {
e.printStackTrace();
System.out.println(“FTP的IP地址可能错误，请正确配置。”);
} catch (IOException e) {
e.printStackTrace();
System.out.println(“FTP的端口错误,请正确配置。”);
}
return ftpClient;
}
public static FTPClient getFTPClient() {
String ftpHost = SystemConfigUtil.getProperty(“imgFtpIp”);
String ftpPort = SystemConfigUtil.getProperty(“imgFtpPort”);
String ftpUserName = SystemConfigUtil.getProperty(“imgFtpUserName”);
String ftpPassword = SystemConfigUtil.getProperty(“imgFtpPwd”);
return getFTPClient(ftpHost, ftpUserName, ftpPassword, Integer.valueOf(ftpPort));
}
/
从FTP服务器下载文件
@param ftpHost FTP IP地址 * @param ftpUserName FTP 用户名 @param ftpPassword FTP用户名密码_ @param ftpPort FTP端口 @param ftpPath FTP服务器中文件所在路径格式： ftptest/aa
@param localPath 下载到本地的位置格式：H:/download
* @param fileName 文件名称 /
_public static void downloadFtpFile(String ftpHost, String ftpUserName,
String ftpPassword, *int ftpPort, String ftpPath, String localPath,
String fileName) {

  FTPClient ftpClient = **null**;
  **try **{<br />         ftpClient = _getFTPClient_(ftpHost, ftpUserName, ftpPassword, ftpPort);<br />         ftpClient.setControlEncoding(**"UTF-8"**); _// 中文支持<br />         _ftpClient.setFileType(FTPClient.**BINARY_FILE_TYPE**);<br />         ftpClient.enterLocalPassiveMode();<br />         ftpClient.changeWorkingDirectory(ftpPath);
     File localFile = **new **File(localPath + File.**separatorChar **+ fileName);<br />         OutputStream os = **new **FileOutputStream(localFile);<br />         ftpClient.retrieveFile(fileName, os);<br />         os.close();<br />         ftpClient.logout();
  } **catch **(FileNotFoundException e) {<br />         System.**out**.println(**"没有找到" **+ ftpPath + **"文件"**);<br />         e.printStackTrace();<br />      } **catch **(SocketException e) {<br />         System.**out**.println(**"连接FTP失败."**);<br />         e.printStackTrace();<br />      } **catch **(IOException e) {<br />         e.printStackTrace();<br />         System.**out**.println(**"文件读取错误。"**);<br />         e.printStackTrace();<br />      }

}

/*
Description: 向FTP服务器上传文件
* @param ftpHost FTP服务器hostname
* @param ftpUserName 账号
* @param ftpPassword 密码
* @param ftpPort 端口
* @param ftpPath FTP服务器中文件所在路径格式： ftptest/aa
* @param fileName ftp文件名称
* @param input 文件流
* @return 成功返回true，否则返回false
*/
public static boolean uploadFile(String ftpHost, String ftpUserName,
String ftpPassword, int ftpPort, String ftpPath,
String fileName,InputStream input) {
boolean success = false;
FTPClient ftpClient = null;
try {
int reply;
ftpClient = getFTPClient(ftpHost, ftpUserName, ftpPassword, ftpPort);
reply = ftpClient.getReplyCode();
if (!FTPReply.isPositiveCompletion(reply)) {
ftpClient.disconnect();
return success;
}
if (FTPReply.isPositiveCompletion(ftpClient.sendCommand(
“OPTS UTF8”, “ON”))) {
localCharSet = “UTF-8”;
}
ftpClient.setControlEncoding(localCharSet);
ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);
ftpClient.enterLocalPassiveMode();
if (!ftpClient.changeWorkingDirectory(ftpPath)) {
//如果目录不存在创建目录
_String[] dirs = ftpPath.split(“/“);
String tempPath = “”;
for (String dir : dirs) {
if (null == dir || “”.equals(dir)) continue;
//tempPath += “/“ + dir;
tempPath = dir ;
tempPath = new String(tempPath.getBytes(_localCharSet),serverCharSet);
if (!ftpClient.changeWorkingDirectory(tempPath)) {
if (!ftpClient.makeDirectory(tempPath)) {
return success;
} else {
ftpClient.changeWorkingDirectory(tempPath);
}
}
}
}
fileName = new String(fileName.getBytes(localCharSet),serverCharSet);

ftpClient.storeFile(fileName, input);

     input.close();<br />         ftpClient.logout();<br />         success = **true**;<br />      } **catch **(IOException e) {<br />         e.printStackTrace();<br />      } **finally **{<br />         **if **(ftpClient.isConnected()) {<br />            **try **{<br />               ftpClient.disconnect();<br />            } **catch **(IOException ioe) {<br />            }<br />         }<br />      }<br />      **return **success;<br />   }<br />    _//上传图片(web MultipartFile 上传)<br />   _**public static boolean **uploadFileMultiPart(String toyorno, String pathKey, String fileName,InputStream input) {<br />      String imgFtpUpload = SystemConfigUtil._getProperty_(**"imgFtpUpload"**);<br />      _//String ftpPath = imgFtpUpload + "/"+ toyorno+"/"+(new ImgFilePath()).getProperty(pathKey); // del by lance<br />      _String ftpPath = imgFtpUpload + toyorno+**"/"**+(**new **ImgFilePath()).getProperty(pathKey); _// add by lance<br />      _**boolean **success = **false**;<br />      FTPClient ftpClient = **null**;<br />      **try **{<br />         **int **reply;<br />         ftpClient = _getFTPClient_();<br />         reply = ftpClient.getReplyCode();<br />         **if **(!FTPReply._isPositiveCompletion_(reply)) {<br />            ftpClient.disconnect();<br />            **return **success;<br />         }<br />         **if **(FTPReply._isPositiveCompletion_(ftpClient.sendCommand(<br />               **"OPTS UTF8"**, **"ON"**))) {<br />            _localCharSet _= **"UTF-8"**;<br />         }<br />         ftpClient.setControlEncoding(_localCharSet_);<br />         ftpClient.setFileType(FTPClient.**BINARY_FILE_TYPE**);<br />         ftpClient.enterLocalPassiveMode();<br />         **if **(!ftpClient.changeWorkingDirectory(ftpPath)) {<br />            _//如果目录不存在创建目录<br />            _String[] dirs = ftpPath.split(**"/"**);<br />            String tempPath = **""**;<br />            **for **(String dir : dirs) {<br />               **if **(**null **== dir || **""**.equals(dir)) **continue**;<br />               _//tempPath += "/" + dir;<br />               _tempPath =  dir ;<br />               tempPath = **new **String(tempPath.getBytes(_localCharSet_),_serverCharSet_);<br />               **if **(!ftpClient.changeWorkingDirectory(tempPath)) {<br />                  **if **(!ftpClient.makeDirectory(tempPath)) {<br />                     **return **success;<br />                  } **else **{<br />                     ftpClient.changeWorkingDirectory(tempPath);<br />                  }<br />               }<br />            }<br />         }<br />         fileName = **new **String(fileName.getBytes(_localCharSet_),_serverCharSet_);<br />         ftpClient.storeFile(fileName, input);<br />         input.close();<br />         ftpClient.logout();<br />         success = **true**;<br />      } **catch **(IOException e) {<br />         e.printStackTrace();<br />      } **finally **{<br />         **if **(ftpClient.isConnected()) {<br />            **try **{<br />               ftpClient.disconnect();<br />            } **catch **(IOException ioe) {<br />            }<br />         }<br />      }<br />      **return **success;<br />   }<br />   _//上传图片(手机先上传临时文件，再上传ftp)<br />   _**public static boolean **uploadFileMobile(String pathKey , String fileName, HttpServletRequest request) {<br />      **if**(StringUtils._isEmpty_(fileName)) **return false**;<br />      String tempDir = (**new **ImgFilePath()).getProperty(**"temp"**).trim();<br />      **if**(StringUtils._isNotEmpty_(tempDir) && !tempDir.endsWith(**"/"**)){<br />         tempDir += **"/"**;<br />      }<br />      String tmpFileName = tempDir  + fileName;<br />      File tmpFile = **new **File(tmpFileName);<br />      **if**(!tmpFile.exists()) **return false**;<br />      String toyorno = RequestHolder._getToyorno_();
  String imgFtpUpload = SystemConfigUtil._getProperty_(**"imgFtpUpload"**);<br />      String ftpPath = imgFtpUpload + **"/"**+ toyorno+**"/"**+(**new **ImgFilePath()).getProperty(pathKey);<br />      **boolean **success = **false**;<br />      FTPClient ftpClient = **null**;<br />      **try **{<br />         **int **reply;<br />         ftpClient = _getFTPClient_();<br />         reply = ftpClient.getReplyCode();<br />         **if **(!FTPReply._isPositiveCompletion_(reply)) {<br />            ftpClient.disconnect();<br />            **return **success;<br />         }<br />         **if **(FTPReply._isPositiveCompletion_(ftpClient.sendCommand(<br />               **"OPTS UTF8"**, **"ON"**))) {<br />            _localCharSet _= **"UTF-8"**;<br />         }<br />         ftpClient.setControlEncoding(_localCharSet_);<br />         ftpClient.setFileType(FTPClient.**BINARY_FILE_TYPE**);<br />         ftpClient.enterLocalPassiveMode();<br />         **if **(!ftpClient.changeWorkingDirectory(ftpPath)) {<br />            _//如果目录不存在创建目录<br />            _String[] dirs = ftpPath.split(**"/"**);<br />            String tempPath = **""**;<br />            **for **(String dir : dirs) {<br />               **if **(**null **== dir || **""**.equals(dir)) **continue**;<br />               _//tempPath += "/" + dir;<br />               _tempPath =  dir ;<br />               tempPath = **new **String(tempPath.getBytes(_localCharSet_),_serverCharSet_);<br />               **if **(!ftpClient.changeWorkingDirectory(tempPath)) {<br />                  **if **(!ftpClient.makeDirectory(tempPath)) {<br />                     **return **success;<br />                  } **else **{<br />                     ftpClient.changeWorkingDirectory(tempPath);<br />                  }<br />               }<br />            }<br />         }
     FileInputStream input = **new **FileInputStream(tmpFile);
     fileName = **new **String(fileName.getBytes(_localCharSet_),_serverCharSet_);<br />         ftpClient.storeFile(fileName, input);<br />         input.close();<br />         ftpClient.logout();<br />         tmpFile.delete();<br />         success = **true**;<br />      } **catch **(IOException e) {<br />         e.printStackTrace();<br />      } **finally **{<br />         **if **(ftpClient.isConnected()) {<br />            **try **{<br />               ftpClient.disconnect();<br />            } **catch **(IOException ioe) {<br />            }<br />         }<br />      }<br />      **return **success;<br />   }<br />   _//上传图片(ueditor上传后，再上传ftp)<br />   _**public static **String uploadFileUeditor(String rootPath,String result, HttpServletRequest request) {<br />      JSONObject jsonObject = **null**;<br />      **try **{<br />         jsonObject = JSONObject._fromObject_(result);<br />      }<br />      **catch **(Exception e){<br />         System.**out**.println(e.getMessage());<br />      }<br />      **if**(jsonObject == **null**){<br />         System.**out**.println(**"ueditor上传出错！"**);<br />         **return ""**;<br />      }<br />      String imgtype = request.getParameter(**"imgtype"**);<br />      String keyno = request.getParameter(**"keyno"**);<br />      String action = request.getParameter(**"action"**);<br />      _//ftp 上传相对路径（toyorno的子目录）<br />      _String path = _ueditorDir_+**"/"**+imgtype+**"/"**+keyno+**"/"**;<br />      _//ueditor上传的图片全路径<br />      _String ueditorFullFileName = rootPath + jsonObject.get(**"url"**).toString().substring(1);
  String toyorno = RequestHolder._getToyorno_();<br />      **if**(StringUtils._isEmpty_(toyorno)){<br />         System.**out**.println(**"上传出错，toyorno不能为空！"**);<br />         **return ""**;<br />      }<br />      **if**(StringUtils._isEmpty_(keyno)){<br />         System.**out**.println(**"上传出错，keyno不能为空！"**);<br />         **return ""**;<br />      }<br />      String imgFtpUpload = SystemConfigUtil._getProperty_(**"imgFtpUpload"**);<br />      String ftpPath = imgFtpUpload + **"/"**+ toyorno+**"/"**+path;<br />      **boolean **success = **false**;<br />      FTPClient ftpClient = **null**;<br />      **try **{<br />         **int **reply;<br />         ftpClient = _getFTPClient_();<br />         reply = ftpClient.getReplyCode();<br />         **if **(!FTPReply._isPositiveCompletion_(reply)) {<br />            ftpClient.disconnect();<br />            **return ""**;<br />         }<br />         **if **(FTPReply._isPositiveCompletion_(ftpClient.sendCommand(<br />               **"OPTS UTF8"**, **"ON"**))) {<br />            _localCharSet _= **"UTF-8"**;<br />         }<br />         ftpClient.setControlEncoding(_localCharSet_);<br />         ftpClient.setFileType(FTPClient.**BINARY_FILE_TYPE**);<br />         ftpClient.enterLocalPassiveMode();<br />         **if **(!ftpClient.changeWorkingDirectory(ftpPath)) {<br />            _//如果目录不存在创建目录<br />            _String[] dirs = ftpPath.split(**"/"**);<br />            String tempPath = **""**;<br />            **for **(String dir : dirs) {<br />               **if **(**null **== dir || **""**.equals(dir)) **continue**;<br />               _//tempPath += "/" + dir;<br />               _tempPath =  dir ;<br />               tempPath = **new **String(tempPath.getBytes(_localCharSet_),_serverCharSet_);<br />               **if **(!ftpClient.changeWorkingDirectory(tempPath)) {<br />                  **if **(!ftpClient.makeDirectory(tempPath)) {<br />                     **return ""**;<br />                  } **else **{<br />                     ftpClient.changeWorkingDirectory(tempPath);<br />                  }<br />               }<br />            }<br />         }
     String tmpFileName = ueditorFullFileName;<br />         File tmpFile = **new **File(tmpFileName);<br />         FileInputStream input = **new **FileInputStream(tmpFile);
     ftpClient.storeFile(**new **String(tmpFile.getName().getBytes(_localCharSet_),_serverCharSet_), input);<br />         input.close();<br />         ftpClient.logout();<br />         tmpFile.delete();<br />         success = **true**;<br />         jsonObject.put(**"url"**, SystemConfigUtil._getProperty_(**"imgHttpServer"**).replace(SystemConfigUtil._getProperty_(**"imgFtpUpload"**),**""**) +ftpPath+tmpFile.getName());
  } **catch **(IOException e) {<br />         e.printStackTrace();<br />      } **finally **{<br />         **if **(ftpClient.isConnected()) {<br />            **try **{<br />               ftpClient.disconnect();<br />            } **catch **(IOException ioe) {<br />            }<br />         }<br />      }<br />      **return **jsonObject.toString();<br />   }<br />   _/**<br />    * 返回FTP目录下的文件列表<br />    * _**@param ftpDirectory<br />    **_* _**@return<br />    **_*/<br />   _**public static **List<String> getFileNameList(String ftpDirectory)<br />   {<br />      List<String> list = **new **ArrayList<String>();<br />      **int **reply;<br />      FTPClient ftpClient = _getFTPClient_();<br />      **try **{<br />         reply = ftpClient.getReplyCode();<br />         **if **(!FTPReply._isPositiveCompletion_(reply)) {<br />            ftpClient.disconnect();<br />            **return **list;<br />         }<br />         **try **{<br />            String[] listNames = ftpClient.listNames(ftpDirectory);<br />            list = Arrays._asList_(listNames);<br />         } **catch **(Exception e) {<br />            e.printStackTrace();<br />         }<br />      }**catch **(Exception e){
  }<br />      **return **list;<br />   }<br />   **public static **String getFileNameListForUeditor(HttpServletRequest request)<br />   {<br />      String imgtype = request.getParameter(**"imgtype"**);<br />      String keyno = request.getParameter(**"keyno"**);<br />      String action = request.getParameter(**"action"**);
  String ftpDirectory = SystemConfigUtil._getProperty_(**"imgFtpUpload"**)+ RequestHolder._getToyorno_()+**"/"**+_ueditorDir_+**"/"**+imgtype+**"/"**+keyno+**"/"**;<br />      List<String> list = _getFileNameList_(ftpDirectory);<br />      **if**(list.size()<=0) **return ""**;<br />      JSONObject jsonObjectResult = **new **JSONObject();<br />      jsonObjectResult.put(**"state"**,**"SUCCESS"**);<br />      jsonObjectResult.put(**"total"**,list.size());<br />      jsonObjectResult.put(**"start"**,0);<br />      JSONArray listfile = **new **JSONArray();<br />      **for**(String filename :list){<br />         JSONObject jsonObject = **new **JSONObject();<br />         jsonObject.put(**"state"**,**"SUCCESS"**);<br />         jsonObject.put(**"url"**, SystemConfigUtil._getProperty_(**"imgHttpServer"**).replace(SystemConfigUtil._getProperty_(**"imgFtpUpload"**),**""**) + filename);<br />         listfile.add(jsonObject);<br />      }<br />      jsonObjectResult.put(**"list"**,listfile);<br />      **return **jsonObjectResult.toString();<br />   }<br />   _//Ueditor<br />_   //删除ftp文件<br />   _**public static boolean **deleteFile(String pathKey , String fileName) {<br />      **if**(StringUtils._isEmpty_(fileName)) **return false**;<br />      String toyorno = RequestHolder._getToyorno_();<br />      String imgFtpUpload = SystemConfigUtil._getProperty_(**"imgFtpUpload"**);<br />      String ftpPath = imgFtpUpload + **"/"**+ toyorno+**"/"**+(**new **ImgFilePath()).getProperty(pathKey);<br />      **boolean **flag = **false**;<br />      FTPClient ftpClient = **null**;<br />      **try **{<br />         **int **reply;<br />         ftpClient = _getFTPClient_();<br />         reply = ftpClient.getReplyCode();<br />         **if **(!FTPReply._isPositiveCompletion_(reply)) {<br />            ftpClient.disconnect();<br />            **return false**;<br />         }<br />         **if **(FTPReply._isPositiveCompletion_(ftpClient.sendCommand(<br />               **"OPTS UTF8"**, **"ON"**))) {<br />            _localCharSet _= **"UTF-8"**;<br />         }<br />         ftpClient.setControlEncoding(_localCharSet_);<br />         _// 切换FTP目录<br />         _ftpClient.changeWorkingDirectory(ftpPath);<br />         fileName = **new **String(fileName.getBytes(_localCharSet_),_serverCharSet_);<br />         ftpClient.dele(fileName);<br />         ftpClient.logout();<br />         flag = **true**;<br />         System.**out**.println(**"删除文件成功"**);<br />      } **catch **(Exception e) {<br />         System.**out**.println(**"删除文件失败"**);<br />         e.printStackTrace();<br />      } **finally **{<br />         **if **(ftpClient.isConnected()) {<br />            **try **{<br />               ftpClient.disconnect();<br />            } **catch **(IOException e) {<br />               e.printStackTrace();<br />            }<br />         }<br />      }<br />      **return **flag;<br />   }<br />}