java获取ftp文件路径怎么写

java获取ftp文件路径怎么写,第1张

package comweixinutil;

import javaioFile;

import javaioFileOutputStream;

import javaioIOException;

import javaioInputStream;

import javaioOutputStream;

import javaioPrintWriter;

import javaioRandomAccessFile;

import orgapachecommonsnetPrintCommandListener;

import orgapachecommonsnetftpFTP;

import orgapachecommonsnetftpFTPClient;

import orgapachecommonsnetftpFTPFile;

import orgapachecommonsnetftpFTPReply;

import comweixinconstantDownloadStatus;

import comweixinconstantUploadStatus;

/

支持断点续传的FTP实用类

@version 01 实现基本断点上传下载

@version 02 实现上传下载进度汇报

@version 03 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

thisftpClientaddProtocolCommandListener(new PrintCommandListener(new PrintWriter(Systemout)));

}

/

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{

ftpClientconnect(hostname, port);

ftpClientsetControlEncoding("GBK");

if(FTPReplyisPositiveCompletion(ftpClientgetReplyCode())){

if(ftpClientlogin(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

ftpCliententerLocalPassiveMode();

//设置以二进制方式传输

ftpClientsetFileType(FTPBINARY_FILE_TYPE);

DownloadStatus result;

//检查远程文件是否存在

FTPFile[] files = ftpClientlistFiles(new String(remotegetBytes("GBK"),"iso-8859-1"));

if(fileslength != 1){

Systemoutprintln("远程文件不存在");

return DownloadStatusRemote_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(fexists()){

long localSize = flength();

//判断本地文件大小是否大于远程文件大小

if(localSize >= lRemoteSize){

Systemoutprintln("本地文件大于远程文件,下载中止");

return DownloadStatusLocal_Bigger_Remote;

}

//进行断点续传,并记录状态

FileOutputStream out = new FileOutputStream(f,true);

ftpClientsetRestartOffset(localSize);

InputStream in = ftpClientretrieveFileStream(new String(remotegetBytes("GBK"),"iso-8859-1"));

byte[] bytes = new byte[1024];

long step = lRemoteSize /100;

long process=localSize /step;

int c;

while((c = inread(bytes))!= -1){

outwrite(bytes,0,c);

localSize+=c;

long nowProcess = localSize /step;

if(nowProcess > process){

process = nowProcess;

if(process % 10 == 0)

Systemoutprintln("下载进度:"+process);

//TODO 更新文件下载进度,值存放在process变量中

}

}

inclose();

outclose();

boolean isDo = ftpClientcompletePendingCommand();

if(isDo){

result = DownloadStatusDownload_From_Break_Success;

}else {

result = DownloadStatusDownload_From_Break_Failed;

}

}else {

OutputStream out = new FileOutputStream(f);

InputStream in= ftpClientretrieveFileStream(new String(remotegetBytes("GBK"),"iso-8859-1"));

byte[] bytes = new byte[1024];

long step = lRemoteSize /100;

long process=0;

long localSize = 0L;

int c;

while((c = inread(bytes))!= -1){

outwrite(bytes, 0, c);

localSize+=c;

long nowProcess = localSize /step;

if(nowProcess > process){

process = nowProcess;

if(process % 10 == 0)

Systemoutprintln("下载进度:"+process);

//TODO 更新文件下载进度,值存放在process变量中

}

}

inclose();

outclose();

boolean upNewStatus = ftpClientcompletePendingCommand();

if(upNewStatus){

result = DownloadStatusDownload_New_Success;

}else {

result = DownloadStatusDownload_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/fileext 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

ftpCliententerLocalPassiveMode();

//设置以二进制流的方式传输

ftpClientsetFileType(FTPBINARY_FILE_TYPE);

ftpClientsetControlEncoding("GBK");

UploadStatus result;

//对远程目录的处理

String remoteFileName = remote;

if(remotecontains("/")){

remoteFileName = remotesubstring(remotelastIndexOf("/")+1);

//创建服务器远程目录结构,创建失败直接返回

if(CreateDirecroty(remote, ftpClient)==UploadStatusCreate_Directory_Fail){

return UploadStatusCreate_Directory_Fail;

}

}

//检查远程是否存在文件

FTPFile[] files = ftpClientlistFiles(new String(remoteFileNamegetBytes("GBK"),"iso-8859-1"));

if(fileslength == 1){

long remoteSize = files[0]getSize();

File f = new File(local);

long localSize = flength();

if(remoteSize==localSize){

return UploadStatusFile_Exits;

}else if(remoteSize > localSize){

return UploadStatusRemote_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 == UploadStatusUpload_From_Break_Failed){

if(!ftpClientdeleteFile(remoteFileName)){

return UploadStatusDelete_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(ftpClientisConnected()){

ftpClientdisconnect();

}

}

/

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 = UploadStatusCreate_Directory_Success;

String directory = remotesubstring(0,remotelastIndexOf("/")+1);

if(!directoryequalsIgnoreCase("/")&&!ftpClientchangeWorkingDirectory(new String(directorygetBytes("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(directorystartsWith("/")){

start = 1;

}else{

start = 0;

}

end = directoryindexOf("/",start);

while(true){

String subDirectory = new String(remotesubstring(start,end)getBytes("GBK"),"iso-8859-1");

if(!ftpClientchangeWorkingDirectory(subDirectory)){

if(ftpClientmakeDirectory(subDirectory)){

ftpClientchangeWorkingDirectory(subDirectory);

}else {

Systemoutprintln("创建目录失败");

return UploadStatusCreate_Directory_Fail;

}

}

start = end + 1;

end = directoryindexOf("/",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 = localFilelength() / 100;

long process = 0;

long localreadbytes = 0L;

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

OutputStream out = ftpClientappendFileStream(new String(remoteFilegetBytes("GBK"),"iso-8859-1"));

//断点续传

if(remoteSize>0){

ftpClientsetRestartOffset(remoteSize);

process = remoteSize /step;

rafseek(remoteSize);

localreadbytes = remoteSize;

}

byte[] bytes = new byte[1024];

int c;

while((c = rafread(bytes))!= -1){

outwrite(bytes,0,c);

localreadbytes+=c;

if(localreadbytes / step != process){

process = localreadbytes / step;

Systemoutprintln("上传进度:" + process);

//TODO 汇报上传状态

}

}

outflush();

rafclose();

outclose();

boolean result =ftpClientcompletePendingCommand();

if(remoteSize > 0){

status = resultUploadStatusUpload_From_Break_Success:UploadStatusUpload_From_Break_Failed;

}else {

status = resultUploadStatusUpload_New_File_Success:UploadStatusUpload_New_File_Failed;

}

return status;

}

public static void main(String[] args) {

ContinueFTP myFtp = new ContinueFTP();

try {

Systemerrprintln(myFtpconnect("10106236", 21, "5", "jieyan"));

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

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

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

// Systemoutprintln(myFtpupload("E:\\ywflv", "/ywflv",5));

// Systemoutprintln(myFtpupload("E:\\爱你等于爱自己mp4","/爱你等于爱自己mp4"));

//Systemoutprintln(myFtpdownload("/爱你等于爱自己mp4", "E:\\爱你等于爱自己mp4"));

myFtpdisconnect();

} catch (IOException e) {

Systemoutprintln("连接FTP出错:"+egetMessage());

}

}

}

第一步: 先获得classpath路径

String classpath = thisgetClass()getResource("/")getPath()replaceFirst("/", "");

这样子可以得到classpath路径,类似于:

F:/projects/JavaStudyParent/study-springmvc-junit-test/target/springmvc-junit-test/WEB-INF/classes/

然后把WEB-INF/classes截取就能获得WebAPP目录啦:

String webappRoot = classpathreplaceAll("WEB-INF/classes/", "");

得到的结果就是:

F:/projects/JavaStudyParent/study-springmvc-junit-test/target/springmvc-junit-test/

通过这个路径你就能获取该文件夹下的所有文件啦

找URL

关于绝对路径和相对路径:

绝对路径就是你的主页上的文件或目录在硬盘上真正的路径,(URL和物理路径)例如:C:xyz esttxt 代表了testtxt文件的绝对路径。>

这道题主要就是利用了String类的split()方法,进行多次调用,已经帮你实现了,代码如下:

public

class

Test{

public

static

void

main(String[]

args){

String

str

=

"c:/win/good/aaatxt;d:/win/good/bbbtxt;c:/win/cccctxt;";

//得到路径数组

String[]

fileRoot

=

strsplit(";");

String[]

fileName

=

null;

for(int

i

=

0;i

<

fileRootlength;i++){

if(fileRoot[i]

!=

null){

fileName

=

fileRoot[i]split("/");

//得到最终需要的文件名

Systemoutprintln

(fileName[fileNamelength-1]);

}

}

}

}

File类有两个常用方法可以得到文件路径一个是:getCanonicalPath(),另一个是:getAbsolutePath(),可以通过File类的实例调用这两个方法例如filegetAbsolutePath()其中file是File的实例对象。下面是一个具体例子:

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

public class PathTest

{

public static void main(String[] args)

{

File file = new File("\\src\\baidu");

Systemoutprintln(filegetAbsolutePath());

try

{

Systemoutprintln(filegetCanonicalPath());

} catch (IOException e)

{

eprintStackTrace();

}

}

}

getAbsolutePath()和getCanonicalPath()的不同之处在于,getCanonicalPath()得到的是一个规范的路径,而getAbsolutePath()是用构造File对象的路径+当前工作目录。例如在上面的例子中(点号)代表当前目录。getCanonicalPath()就会把它解析为当前目录但是getAbsolutePath()会把它解析成为目录名字(目录名字是点号)。

下面是上面程序在我电脑上的输出:

G:\xhuoj\konw\\src\baidu

G:\xhuoj\konw\src\baidu

1、利用SystemgetProperty()函数获取当前路径:

Systemoutprintln(SystemgetProperty("userdir"));//userdir指定了当前的路径

2、使用File提供的函数获取当前路径:

File directory = new File("");//设定为当前文件夹

try{

Systemoutprintln(directorygetCanonicalPath());//获取标准的路径

Systemoutprintln(directorygetAbsolutePath());//获取绝对路径

}catch(Exceptin e){}

FilegetCanonicalPath()和FilegetAbsolutePath()大约只是对于new File("")和new File("")两种路径有所区别。

# 对于getCanonicalPath()函数,“"就表示当前的文件夹,而”“则表示当前文件夹的上一级文件夹

# 对于getAbsolutePath()函数,则不管””、“”,返回当前的路径加上你在new File()时设定的路径

# 至于getPath()函数,得到的只是你在new File()时设定的路径

一个例子,如果有一个Test文件夹里面有testjava和hellotxt如果你想用testjava *** 作hellotxt

只要在testjava中这样写File file=new File("hellotxt");//这样就是相对路径。如果文件结构是

Test文件夹

|------testjava

|------hellotxt

|------source文件夹

|---------worldtxt

如果想在testjava中 *** 作worldtxt。只要这样写File file=new File("source/worldtxt");

另外,在web开发中/代表项目文件夹根目录,当然也有可能代替webapps,区分方法是:如果/开头的uri是给浏览器解析则/代表webapps,如果是给服务器后台解析,则代表项目文件

以上就是关于java获取ftp文件路径怎么写全部的内容,包括:java获取ftp文件路径怎么写、关于web工程中java类如何获取webapp路径下的文件、java html file 获得file文件本地路径 要简单点的方法等相关内容解答,如果想了解更多相关内容,可以关注我们,你们的支持是我们更新的动力!

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