java基于Apache FTP实现文件上传、下载、修改文件名、删除
Apache FTP 是应用比较广泛的FTP上传客户端工具，它易于操作，代码简略，结构清晰，是做FTP文件客户端管理软件的优先之选。FTP的操作包括：FTP文件上传（断点续传）、FTP文件下载、FTP文件重命名、FTP文件删除，这些操作已经将FTP应用管理的方式发挥的淋漓尽致了，So 我一直都用此种方式来实现FTP文件服务器的管理工作；下附FTP工具代码。1、FTP文件操作状态枚举类
package com.scengine.wtms.utils.ftp;
public enum FTPStatus
{
File_Exits(0), Create_Directory_Success(1), Create_Directory_Fail(2), Upload_From_Break_Success(3), Upload_From_Break_Faild(4), Download_From_Break_Success(5), Download_From_Break_Faild(6), Upload_New_File_Success(7), Upload_New_File_Failed(8), Delete_Remote_Success(9), Delete_Remote_Faild(10),Remote_Bigger_Local(11),Remote_smaller_local(12),Not_Exist_File(13),Remote_Rename_Success(14),Remote_Rename_Faild(15),File_Not_Unique(16);
private int status;
public int getStatus()
{
return status;
}
public void setStatus(int status)
{
this.status = status;
}
FTPStatus(int status)
{
this.status = status;
}
}
2、FTP文件操作工具代码
package com.scengine.wtms.utils.ftp;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.net.PrintCommandListener;
import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPFile;
import org.apache.commons.net.ftp.FTPReply;
import com.scengine.wtms.utils.Log;
public class FTPUtils
{
private FTPClient ftpClient = new FTPClient();
/**
* 对象构造 设置将过程中使用到的命令输出到控制台
*/
public FTPUtils()
{
this.ftpClient.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out)));
}
/**
*
* java编程中用于连接到FTP服务器
*
* @param hostname
* 主机名
*
* @param port
* 端口
*
* @param username
* 用户名
*
* @param password
* 密码
*
* @return 是否连接成功
*
* @throws IOException
*/
public boolean connect(String hostname, int port, String username, String password) throws IOException
{
ftpClient.connect(hostname, port);
if (FTPReply.isPositiveCompletion(ftpClient.getReplyCode()))
{
if (ftpClient.login(username, password))
{
return true;
}
}
disconnect();
return false;
}
/**
* 删除远程FTP文件
*
* @param remote
* 远程文件路径
* @return
* @throws IOException
*/
public FTPStatus delete(String remote) throws IOException
{
ftpClient.enterLocalPassiveMode();
ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
FTPStatus result = null;
FTPFile[] files = ftpClient.listFiles(remote);
if (files.length == 1)
{
boolean status = ftpClient.deleteFile(remote);
result = status ? FTPStatus.Delete_Remote_Success : FTPStatus.Delete_Remote_Faild;
}
else
{
result = FTPStatus.Not_Exist_File;
}
Log.getLogger(this.getClass()).info("FTP服务器文件删除标识："+result);
return result;
}
/**
* 重命名远程FTP文件
*
* @param name
* 新远程文件名称(路径-必须保证在同一路径下)
*
* @param remote
* 远程文件路径
*
* @return 是否成功
*
* @throws IOException
*/
public FTPStatus rename(String name,String remote) throws IOException
{
ftpClient.enterLocalPassiveMode();
ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
FTPStatus result = null;
FTPFile[] files = ftpClient.listFiles(remote);
if (files.length == 1)
{
boolean status = ftpClient.rename(remote, name);
result = status ? FTPStatus.Remote_Rename_Success : FTPStatus.Remote_Rename_Faild;
}
else
{
result = FTPStatus.Not_Exist_File;
}
Log.getLogger(this.getClass()).info("FTP服务器文件名更新标识："+result);
return result;
}
/**
*
* 从FTP服务器上下载文件
*
* @param fileName
* 下载文件的名字(包括后缀名)
*
* @param remote
* 远程文件路径
*
* @param local
* 本地文件路径
*
* @return 是否成功
*
* @throws IOException
*/
public FTPStatus download(String fileName,String remote,HttpServletResponse response) throws IOException
{
// 开启输出流弹出文件保存路径选择窗口
response.setContentType("application/octet-stream");
response.setContentType("application/OCTET-STREAM;charset=UTF-8");
response.setHeader("Content-Disposition", "attachment;filename=" +fileName);
ftpClient.enterLocalPassiveMode();
ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
FTPStatus result;
OutputStream out = response.getOutputStream();
boolean status = ftpClient.retrieveFile(remote, out);
result=status?FTPStatus.Download_From_Break_Success:FTPStatus.Download_From_Break_Faild;
Log.getLogger(this.getClass()).info("FTP服务器文件下载标识："+result);
out.close();
return result;
}
/**
*
* 从FTP服务器上下载文件
*
* @param remote
* 远程文件路径
*
* @param local
* 本地文件路径
*
* @return 是否成功
*
* @throws IOException
*/
@SuppressWarnings("resource")
public FTPStatus download(String remote, String local) throws IOException
{
ftpClient.enterLocalPassiveMode();
ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
FTPStatus result;
File f = new File(local);
FTPFile[] files = ftpClient.listFiles(remote);
if (files.length != 1)
{
Log.getLogger(this.getClass()).info("远程文件不唯一");
return FTPStatus.File_Not_Unique;
}
long lRemoteSize = files.getSize();
if (f.exists())
{
OutputStream out = new FileOutputStream(f, true);
Log.getLogger(this.getClass()).info("本地文件大小为:" + f.length());
if (f.length() >= lRemoteSize)
{
Log.getLogger(this.getClass()).info("本地文件大小大于远程文件大小，下载中止");
return FTPStatus.Remote_smaller_local;
}
ftpClient.setRestartOffset(f.length());
boolean status = ftpClient.retrieveFile(remote, out);
result=status?FTPStatus.Download_From_Break_Success:FTPStatus.Download_From_Break_Faild;
out.close();
} else
{
OutputStream out = new FileOutputStream(f);
boolean status = ftpClient.retrieveFile(remote, out);
result=status?FTPStatus.Download_From_Break_Success:FTPStatus.Download_From_Break_Faild;
out.close();
}
return result;
}
/**
*
* 上传文件到FTP服务器，支持断点续传
*
* @param local
* 本地文件名称，绝对路径
*
* @param remote
* 远程文件路径，使用/home/directory1/subdirectory/file.ext
* 按照Linux上的路径指定方式，支持多级目录嵌套，支持递归创建不存在的目录结构
*
* @return 上传结果
*
* @throws IOException
*/
@SuppressWarnings("resource")
public FTPStatus upload(String local, String remote) throws IOException
{
// 设置PassiveMode传输
ftpClient.enterLocalPassiveMode();
// 设置以二进制流的方式传输
ftpClient.setFileType(FTP.BINARY_FILE_TYPE);
FTPStatus result;
// 对远程目录的处理
String remoteFileName = remote;
if (remote.contains("/"))
{
remoteFileName = remote.substring(remote.lastIndexOf("/") + 1);
String directory = remote.substring(0, remote.lastIndexOf("/") + 1);
if (!directory.equalsIgnoreCase("/") && !ftpClient.changeWorkingDirectory(directory))
{
// 如果远程目录不存在，则递归创建远程服务器目录
int start = 0;
int end = 0;
if (directory.startsWith("/"))
{
start = 1;
} else
{
start = 0;
}
end = directory.indexOf("/", start);
while (true)
{
String subDirectory = remote.substring(start, end);
if (!ftpClient.changeWorkingDirectory(subDirectory))
{
if (ftpClient.makeDirectory(subDirectory))
{
ftpClient.changeWorkingDirectory(subDirectory);
} else
{
Log.getLogger(this.getClass()).info("创建目录失败");
return FTPStatus.Create_Directory_Fail;
}
}
start = end + 1;
end = directory.indexOf("/", start);
// 检查所有目录是否创建完毕
if (end <= start)
{
break;
}
}
}
}
// 检查远程是否存在文件
FTPFile[] files = ftpClient.listFiles(remoteFileName);
if (files.length == 1)
{
long remoteSize = files.getSize();
File f = new File(local);
long localSize = f.length();
if (remoteSize == localSize)
{
return FTPStatus.File_Exits;
} else if (remoteSize > localSize)
{
return FTPStatus.Remote_Bigger_Local;
}
// 尝试移动文件内读取指针,实现断点续传
InputStream is = new FileInputStream(f);
if (is.skip(remoteSize) == remoteSize)
{
ftpClient.setRestartOffset(remoteSize);
if (ftpClient.storeFile(remote, is))
{
return FTPStatus.Upload_From_Break_Success;
}
}
// 如果断点续传没有成功，则删除服务器上文件，重新上传
if (!ftpClient.deleteFile(remoteFileName))
{
return FTPStatus.Delete_Remote_Faild;
}
is = new FileInputStream(f);
if (ftpClient.storeFile(remote, is))
{
result = FTPStatus.Upload_New_File_Success;
} else
{
result = FTPStatus.Upload_New_File_Failed;
}
is.close();
} else
{
InputStream is = new FileInputStream(local);
if (ftpClient.storeFile(remoteFileName, is))
{
result = FTPStatus.Upload_New_File_Success;
} else
{
result = FTPStatus.Upload_New_File_Failed;
}
is.close();
}
return result;
}
/**
*
* 断开与远程服务器的连接
*
* @throws IOException
*/
public void disconnect() throws IOException
{
if (ftpClient.isConnected())
{
ftpClient.disconnect();
}
}
public static void main(String[] args)
{
FTPUtils myFtp = new FTPUtils();
try
{
myFtp.connect("192.168.1.200", 21, "duser", "HTPDuserXP32");
Log.getLogger(FTPUtils.class).info(myFtp.upload("C:\\Users\\Administrator\\Desktop\\swing.drawer.jar", "/jars/swing.drawer.jar"));
myFtp.disconnect();
} catch (IOException e)
{
Log.getLogger(FTPUtils.class).info("FTP上传文件异常：" + e.getMessage());
}
}
}
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。
文档来源：服务器之家http://www.zzvips.com/article/80080.html
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