「java下载ftp文件」java ftp jar

admin 2023-03-18 15:48:08 488

本篇文章给大家谈谈java下载ftp文件，以及java ftp jar对应的知识点，希望对各位有所帮助，不要忘了收藏本站喔。

本文目录一览：

1、ftp java 下载的时候怎么保存到指定位置
2、java 实现ftp上传下载，windows下和linux下游何区别？
3、java FTP下载文件在代码中如何实现知道下载完成?
4、java 下载异地FTP中的zip文件
5、java FTP下载
6、用java怎么获取ftp上的文件

ftp java 下载的时候怎么保存到指定位置

通过工具类来实现本地路径定义和下载即可。

import hkrt.b2b.view.util.Log;

import hkrt.b2b.view.util.ViewUtil;

import java.io.ByteArrayOutputStream;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.InputStream;

import org.apache.commons.net.;

public class CCFCCBFTP {

/**

* 上传文件

* @param fileName

* @param plainFilePath 明文文件路径路径

* @param filepath

* @return

* @throws Exception

public static String fileUploadByFtp(String plainFilePath, String fileName, String filepath) throws Exception {

FileInputStream fis = null;

ByteArrayOutputStream bos = null;

FTPClient ftpClient = new FTPClient();

String bl = "false";

try {

fis = new FileInputStream(plainFilePath);

bos = new ByteArrayOutputStream(fis.available());

byte[] buffer = new byte[1024];

int count = 0;

while ((count = fis.read(buffer)) != -1) {

bos.write(buffer, 0, count);

}

bos.flush();

Log.info("加密上传文件开始");

Log.info("连接远程上传服务器"+CCFCCBUtil.CCFCCBHOSTNAME+":"+22);

ftpClient.connect(CCFCCBUtil.CCFCCBHOSTNAME, 22);

ftpClient.login(CCFCCBUtil.CCFCCBLOGINNAME, CCFCCBUtil.CCFCCBLOGINPASSWORD);

FTPFile[] fs;

fs = ftpClient.listFiles();

for (FTPFile ff : fs) {

if (ff.getName().equals(filepath)) {

bl="true";

ftpClient.changeWorkingDirectory("/"+filepath+"");

}

Log.info("检查文件路径是否存在：/"+filepath);

if("false".equals(bl)){

ViewUtil.dataSEErrorPerformedCommon( "查询文件路径不存在："+"/"+filepath);

return bl;

}

ftpClient.setBufferSize(1024);

ftpClient.setControlEncoding("GBK");

// 设置文件类型（二进制）

ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);

ftpClient.storeFile(fileName, fis);

Log.info("上传文件成功："+fileName+"。文件保存路径："+"/"+filepath+"/");

return bl;

} catch (Exception e) {

throw e;

} finally {

if (fis != null) {

try {

fis.close();

} catch (Exception e) {

Log.info(e.getLocalizedMessage(), e);

}

if (bos != null) {

try {

bos.close();

} catch (Exception e) {

Log.info(e.getLocalizedMessage(), e);

}

/**

*下载并解压文件

* @param localFilePath

* @param fileName

* @param routeFilepath

* @return

* @throws Exception

public static String fileDownloadByFtp(String localFilePath, String fileName,String routeFilepath) throws Exception {

FileInputStream fis = null;

ByteArrayOutputStream bos = null;

FileOutputStream fos = null;

FTPClient ftpClient = new FTPClient();

String SFP = System.getProperty("file.separator");

String bl = "false";

try {

Log.info("下载并解密文件开始");

Log.info("连接远程下载服务器"+CCFCCBUtil.CCFCCBHOSTNAME+":"+22);

ftpClient.connect(CCFCCBUtil.CCFCCBHOSTNAME, 22);

ftpClient.login(CCFCCBUtil.CCFCCBLOGINNAME, CCFCCBUtil.CCFCCBLOGINPASSWORD);

CMBCUtil.CMBCLOGINPASSWORD);

FTPFile[] fs;

ftpClient.makeDirectory(routeFilepath);

ftpClient.changeWorkingDirectory(routeFilepath);

bl = "false";

fs = ftpClient.listFiles();

for (FTPFile ff : fs) {

if (ff.getName().equals(fileName)) {

bl = "true";

Log.info("下载文件开始。");

ftpClient.setBufferSize(1024);

// 设置文件类型（二进制）

ftpClient.setFileType(FTPClient.BINARY_FILE_TYPE);

InputStream is = ftpClient.retrieveFileStream(fileName);

bos = new ByteArrayOutputStream(is.available());

byte[] buffer = new byte[1024];

int count = 0;

while ((count = is.read(buffer)) != -1) {

bos.write(buffer, 0, count);

}

bos.flush();

fos = new FileOutputStream(localFilePath+SFP+fileName);

fos.write(bos.toByteArray());

Log.info("下载文件结束："+localFilePath);

}

Log.info("检查文件是否存："+fileName+" "+bl);

if("false".equals(bl)){

ViewUtil.dataSEErrorPerformedCommon("查询无结果，请稍后再查询。");

return bl;

}

return bl;

} catch (Exception e) {

throw e;

} finally {

if (fis != null) {

try {

fis.close();

} catch (Exception e) {

Log.info(e.getLocalizedMessage(), e);

}

if (bos != null) {

try {

bos.close();

} catch (Exception e) {

Log.info(e.getLocalizedMessage(), e);

}

if (fos != null) {

try {

fos.close();

} catch (Exception e) {

Log.info(e.getLocalizedMessage(), e);

}

// 调用样例：

public static void main(String[] args) {

try {

// 明文文件路径

String plainFilePath = "D:/req_20150204_0011.txt";

// 密文文件路径

String secretFilePath = "req_20150204_00134.txt";

fileDownloadByFtp("D://123.zip","123.zip","req/20150228");

} catch (Exception e) {

e.printStackTrace();

}

java 实现ftp上传下载，windows下和linux下游何区别？

package com.weixin.util;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.OutputStream;

import java.io.PrintWriter;

import java.io.RandomAccessFile;

import org.apache.commons.net.PrintCommandListener;

import org.apache.commons.net.;

import com.weixin.constant.DownloadStatus;

import com.weixin.constant.UploadStatus;

/**

* 支持断点续传的FTP实用类

* @version 0.1 实现基本断点上传下载

* @version 0.2 实现上传下载进度汇报

* @version 0.3 实现中文目录创建及中文文件创建，添加对于中文的支持

public class ContinueFTP {

public FTPClient ftpClient = new FTPClient();

public ContinueFTP(){

//设置将过程中使用到的命令输出到控制台

this.ftpClient.addProtocolCommandListener(new PrintCommandListener(new PrintWriter(System.out)));

}

/**

* 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);

ftpClient.setControlEncoding("GBK");

if(FTPReply.isPositiveCompletion(ftpClient.getReplyCode())){

if(ftpClient.login(username, password)){

return true;

}

disconnect();

return false;

}

/**

* 从FTP服务器上下载文件,支持断点续传，上传百分比汇报

* @param remote 远程文件路径

* @param local 本地文件路径

* @return 上传的状态

* @throws IOException

public DownloadStatus download(String remote,String local) throws IOException{

//设置被动模式

ftpClient.enterLocalPassiveMode();

//设置以二进制方式传输

ftpClient.setFileType();

DownloadStatus result;

//检查远程文件是否存在

FTPFile[] files = ftpClient.listFiles(new String(remote.getBytes("GBK"),"iso-8859-1"));

if(files.length != 1){

System.out.println("远程文件不存在");

return DownloadStatus.Remote_File_Noexist;

}

long lRemoteSize = files[0].getSize();

File f = new File(local);

//本地存在文件，进行断点下载

if(f.exists()){

long localSize = f.length();

//判断本地文件大小是否大于远程文件大小

if(localSize = lRemoteSize){

System.out.println("本地文件大于远程文件，下载中止");

return DownloadStatus.Local_Bigger_Remote;

}

//进行断点续传，并记录状态

FileOutputStream out = new FileOutputStream(f,true);

ftpClient.setRestartOffset(localSize);

InputStream in = ftpClient.retrieveFileStream(new String(remote.getBytes("GBK"),"iso-8859-1"));

byte[] bytes = new byte[1024];

long step = lRemoteSize /100;

long process=localSize /step;

int c;

while((c = in.read(bytes))!= -1){

out.write(bytes,0,c);

localSize+=c;

long nowProcess = localSize /step;

if(nowProcess process){

process = nowProcess;

if(process % 10 == 0)

System.out.println("下载进度："+process);

//TODO 更新文件下载进度,值存放在process变量中

}

in.close();

out.close();

boolean isDo = ftpClient.completePendingCommand();

if(isDo){

result = DownloadStatus.Download_From_Break_Success;

}else {

result = DownloadStatus.Download_From_Break_Failed;

}

}else {

OutputStream out = new FileOutputStream(f);

InputStream in= ftpClient.retrieveFileStream(new String(remote.getBytes("GBK"),"iso-8859-1"));

byte[] bytes = new byte[1024];

long step = lRemoteSize /100;

long process=0;

long localSize = 0L;

int c;

while((c = in.read(bytes))!= -1){

out.write(bytes, 0, c);

localSize+=c;

long nowProcess = localSize /step;

if(nowProcess process){

process = nowProcess;

if(process % 10 == 0)

System.out.println("下载进度："+process);

//TODO 更新文件下载进度,值存放在process变量中

}

in.close();

out.close();

boolean upNewStatus = ftpClient.completePendingCommand();

if(upNewStatus){

result = DownloadStatus.Download_New_Success;

}else {

result = DownloadStatus.Download_New_Failed;

}

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

public UploadStatus 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();

ftpClient.setControlEncoding("GBK");

UploadStatus result;

//对远程目录的处理

String remoteFileName = remote;

if(remote.contains("/")){

remoteFileName = remote.substring(remote.lastIndexOf("/")+1);

//创建服务器远程目录结构，创建失败直接返回

if(CreateDirecroty(remote, ftpClient)==UploadStatus.Create_Directory_Fail){

return UploadStatus.Create_Directory_Fail;

}

//检查远程是否存在文件

FTPFile[] files = ftpClient.listFiles(new String(remoteFileName.getBytes("GBK"),"iso-8859-1"));

if(files.length == 1){

long remoteSize = files[0].getSize();

File f = new File(local);

long localSize = f.length();

if(remoteSize==localSize){

return UploadStatus.File_Exits;

}else if(remoteSize localSize){

return UploadStatus.Remote_Bigger_Local;

}

//尝试移动文件内读取指针,实现断点续传

result = uploadFile(remoteFileName, f, ftpClient, remoteSize);

//如果断点续传没有成功，则删除服务器上文件，重新上传

if(result == UploadStatus.Upload_From_Break_Failed){

if(!ftpClient.deleteFile(remoteFileName)){

return UploadStatus.Delete_Remote_Faild;

}

result = uploadFile(remoteFileName, f, ftpClient, 0);

}

}else {

result = uploadFile(remoteFileName, new File(local), ftpClient, 0);

}

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();

}

/**

* 递归创建远程服务器目录

* @param remote 远程服务器文件绝对路径

* @param ftpClient FTPClient对象

* @return 目录创建是否成功

* @throws IOException

public UploadStatus CreateDirecroty(String remote,FTPClient ftpClient) throws IOException{

UploadStatus status = UploadStatus.Create_Directory_Success;

String directory = remote.substring(0,remote.lastIndexOf("/")+1);

if(!directory.equalsIgnoreCase("/")!ftpClient.changeWorkingDirectory(new String(directory.getBytes("GBK"),"iso-8859-1"))){

//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 = new String(remote.substring(start,end).getBytes("GBK"),"iso-8859-1");

if(!ftpClient.changeWorkingDirectory(subDirectory)){

if(ftpClient.makeDirectory(subDirectory)){

ftpClient.changeWorkingDirectory(subDirectory);

}else {

System.out.println("创建目录失败");

return UploadStatus.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;

}

return status;

}

/**

* 上传文件到服务器,新上传和断点续传

* @param remoteFile 远程文件名，在上传之前已经将服务器工作目录做了改变

* @param localFile 本地文件File句柄，绝对路径

* @param processStep 需要显示的处理进度步进值

* @param ftpClient FTPClient引用

* @return

* @throws IOException

public UploadStatus uploadFile(String remoteFile,File localFile,FTPClient ftpClient,long remoteSize) throws IOException{

UploadStatus status;

//显示进度的上传

long step = localFile.length() / 100;

long process = 0;

long localreadbytes = 0L;

RandomAccessFile raf = new RandomAccessFile(localFile,"r");

OutputStream out = ftpClient.appendFileStream(new String(remoteFile.getBytes("GBK"),"iso-8859-1"));

//断点续传

if(remoteSize0){

ftpClient.setRestartOffset(remoteSize);

process = remoteSize /step;

raf.seek(remoteSize);

localreadbytes = remoteSize;

}

byte[] bytes = new byte[1024];

int c;

while((c = raf.read(bytes))!= -1){

out.write(bytes,0,c);

localreadbytes+=c;

if(localreadbytes / step != process){

process = localreadbytes / step;

System.out.println("上传进度:" + process);

//TODO 汇报上传状态

}

out.flush();

raf.close();

out.close();

boolean result =ftpClient.completePendingCommand();

if(remoteSize 0){

status = result?UploadStatus.Upload_From_Break_Success:UploadStatus.Upload_From_Break_Failed;

}else {

status = result?UploadStatus.Upload_New_File_Success:UploadStatus.Upload_New_File_Failed;

}

return status;

}

public static void main(String[] args) {

ContinueFTP myFtp = new ContinueFTP();

try {

System.err.println(my("10.10.6.236", 21, "5", "jieyan"));

// my(new String("歌曲".getBytes("GBK"),"iso-8859-1"));

// my(new String("爱你等于爱自己".getBytes("GBK"),"iso-8859-1"));

// System.out.println(my("E:\\yw.flv", "/yw.flv",5));

// System.out.println(my("E:\\爱你等于爱自己.mp4","/爱你等于爱自己.mp4"));

//System.out.println(my("/爱你等于爱自己.mp4", "E:\\爱你等于爱自己.mp4"));

my;

} catch (IOException e) {

System.out.println("连接FTP出错："+e.getMessage());

}

java FTP下载文件在代码中如何实现知道下载完成?

public static void downloadFileFtp(KmConfig kmConfig,String fileName, String clientFileName, OutputStream outputStream){

try {

String ftpHost = kmConfig.getFtpHost();

int port = kmConfig.getFtpPort();

String userName = kmConfig.getFtpUser();

String passWord = kmConfig.getFtpPassword();

String path = kmConfig.getFtpPath();

FtpClient ftpClient = new FtpClient(ftpHost, port);// ftpHost为FTP服务器的IP地址，port为FTP服务器的登陆端口,ftpHost为String型,port为int型。

ftpClient.login(userName, passWord);// userName、passWord分别为FTP服务器的登陆用户名和密码

ftpClient.binary();

ftpClient.cd(path);// path为FTP服务器上保存上传文件的路径。

try {

TelnetInputStream in = ftpClient.get(fileName);

byte[] bytes = new byte[1024];

int cnt=0;

while ((cnt=in.read(bytes,0,bytes.length)) != -1) {

outputStream.write(bytes, 0, cnt);

}

//##############################################

//这里文件就已经下载完了，自己理解一下

//#############################################

outputStream.close();

in.close();

} catch (Exception e) {

ftpClient.closeServer();

e.printStackTrace();

}

ftpClient.closeServer();

} catch (Exception e) {

System.out.println("下载文件失败！请检查系统FTP设置,并确认FTP服务启动");

}

java 下载异地FTP中的zip文件

这个要做定时任务的，ftp不可能主动给你发，只能自己每隔多长时间就去检索一次，应该把ftp文件目录结构和文件名称全部存入数据库，在下载时候对文件的标识状态位进行更新，方便于对文件的判断。然后从ftp下载文件即可。如果需要连接ftp下载文件的代码，可以发送邮件到JavaWebDevelop@hotmial.com

java FTP下载

检查一下是否timeout时间设置过短。不要设置内存或者处理器限制。还有在IIS的metabase数据库中找一下FTP的设置，在那里找配置文件修改最直接。

通过CFtpFileFind 得到文件的URL之后，然后通过CHttpFile::QueryInfo 得到文件大小。

求采纳为满意回答。

用java怎么获取ftp上的文件

public class FtpClientUtil {

FtpClient ftpClient;

private String server;

private int port;

private String userName;

private String userPassword;

public FtpClientUtil(String server,int port,String userName,String userPassword)

{

this.server=server;

this.port=port;

this.userName=userName;

this.userPassword=userPassword;

}

/**

* 链接到服务器

* @return

public boolean open()

{

if(ftpClient!=nullftpClient.serverIsOpen())

return true;

try

{

ftpClient= new FtpClient();

ftpClient.openServer(server,port);

ftpClient.login(userName, userPassword);

ftpClient.binary();

return true;

}

catch(Exception e)

{

e.printStackTrace();

ftpClient=null;

return false;

}

public boolean cd(String dir){

boolean f = false;

try {

ftpClient.cd(dir);

} catch (IOException e) {

Logs.error(e.toString());

return f;

}

return true;

}

/**

* 上传文件到FTP服务器

* @param localPathAndFileName 本地文件目录和文件名

* @param ftpFileName 上传后的文件名

* @param ftpDirectory FTP目录如:/path1/pathb2/,如果目录不存在回自动创建目录

* @throws Exception

public boolean upload(String localDirectoryAndFileName,String ftpFileName,String ftpDirectory)throws Exception {

if(!open())

return false;

FileInputStream is=null;

TelnetOutputStream os=null;

try

{

char ch = ' ';

if (ftpDirectory.length() 0)

ch = ftpDirectory.charAt(ftpDirectory.length() - 1);

for (; ch == '/' || ch == '\\'; ch = ftpDirectory.charAt(ftpDirectory.length() - 1))

ftpDirectory = ftpDirectory.substring(0, ftpDirectory.length() - 1);

int slashIndex = ftpDirectory.indexOf(47);

int backslashIndex = ftpDirectory.indexOf(92);

int index = slashIndex;

String dirall = ftpDirectory;

if (backslashIndex != -1 (index == -1 || index backslashIndex))

index = backslashIndex;

String directory = "";

while (index != -1) {

if (index 0) {

String dir = dirall.substring(0, index);

directory = directory + "/" + dir;

ftpClient.sendServer("XMKD " + directory + "\r\n");

ftpClient.readServerResponse();

}

dirall = dirall.substring(index + 1);

slashIndex = dirall.indexOf(47);

backslashIndex = dirall.indexOf(92);

index = slashIndex;

if (backslashIndex != -1 (index == -1 || index backslashIndex))

index = backslashIndex;

}

ftpClient.sendServer("XMKD " + ftpDirectory + "\r\n");

ftpClient.readServerResponse();

os = ftpClient.put(ftpDirectory + "/"

+ ftpFileName);

File file_in = new File(localDirectoryAndFileName);

is = new FileInputStream(file_in);

byte bytes[] = new byte[1024];

int i;

while ((i = is.read(bytes)) != -1)

os.write(bytes, 0, i);

//清理垃圾

return true;

}

catch(Exception e)

{

e.printStackTrace();

return false;

}

finally

{

if (is != null)

is.close();

if (os != null)

os.close();

}

/**

* 从FTP服务器上下载文件并返回下载文件长度

* @param ftpDirectoryAndFileName

* @param localDirectoryAndFileName

* @return

* @throws Exception

public long download(String ftpDirectoryAndFileName,String localDirectoryAndFileName)throws Exception

{

long result = 0;

if(!open())

return result;

TelnetInputStream is = null;

FileOutputStream os = null;

try

{

is = ftpClient.get(ftpDirectoryAndFileName);

java.io.File outfile = new java.io.File(localDirectoryAndFileName);

os = new FileOutputStream(outfile);

byte[] bytes = new byte[1024];

int c;

while ((c = is.read(bytes)) != -1)

{

os.write(bytes, 0, c);

result = result + c;

}

catch (Exception e)

{

throw e;

}

finally

{

if (is != null)

is.close();

if (os != null)

os.close();

}

return result;

}

/**

* 返回FTP目录下的文件列表

* @param ftpDirectory

* @return

public ListString getFileNameList(String ftpDirectory)

{

ListString list = new ArrayListString();

if(!open())

return list;

try

{

DataInputStream dis = new DataInputStream(ftpClient.nameList(ftpDirectory));

String filename = "";

while((filename=dis.readLine())!=null)

{

list.add(filename);

}

} catch (Exception e)

{

e.printStackTrace();

}

return list;

}

/**

* 删除FTP上的文件

* @param ftpDirAndFileName

public boolean deleteFile(String ftpDirAndFileName)

{

if(!open())

return false;

ftpClient.sendServer("DELE "+ftpDirAndFileName+"\r\n");

return true;

}

/**

* 删除FTP目录

* @param ftpDirectory

public boolean deleteDirectory(String ftpDirectory)

{

if(!open())

return false;

ftpClient.sendServer("XRMD "+ftpDirectory+"\r\n");

return true;

}

/**

* 关闭链接

public void close()

{

try

{

if(ftpClient!=nullftpClient.serverIsOpen())

ftpClient.closeServer();

}catch(Exception e)

{

}

}望采纳，谢谢。

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