java上传ftp时500

java上传和下载的文件大小不同

1、不算。。windows系统的文件判断和java中文件大小判断不一样。。windows中文件大小不足1kb有可能会显示为1kb但是java中如果是int类型很可能只会显示0KB0字节不代表没有该文件，比如空文件这个就很正常了。

2、在后台action中判断，把上传的文件流用字节读出来，判断这个文件的字节流大小。

3、publicvoidwrite(byte[]b)throwsIOException向输入流里写入一个字节数组b。

1、在后台action中判断，把上传的文件流用字节读出来，判断这个文件的字节流大小。

2、实现方法参考：上传文件io传输时必然有循环，在循环中设置监听变量，每次循环前都判断下该变量是否为true，若不是return/结束程序。当提交取消功能时设置监听变量为false，其间可能会设计到多线程问题，要好好考虑。

3、创建缓冲区BufferedReader，设置缓存大小为1M，读满了后就写到文件夹，然后判断数据写完没有，没写完创建新的文件路径，循环写入。

Ⅱ java上传FTP为什么总是返回false

java上传FTP为什么总是返回false
: ftpClient.setControlEncoding("GBK"); 这个改成下面试试 ftpClient.setControlEncoding("UTF-8");

Ⅲ 公司要求做一个java和jsp怎么实现ftp上传的功能模块，我没有做过，谁有讲得细一点的文章或网站。

form表单提交文件，建议用smartupload上传，暂存在web服务器目录下，然后稍微一下下面的代码，ftp上传后，删除暂存文件，ok
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.util.StringTokenizer;

import org.apache.commons.net.ftp.FTP;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.ftp.FTPReply;
import org.apache.log4j.Logger;

/**
* Ftp 服务类，对Apache的commons.net.ftp进行了包装<br>
* 依赖库文件：commons-net-1.4.1.jar
*
* @version 1.0 2008-02-18
* @author huchao@jbsoft
*/
public class FtpService {

public FtpService(String serverAddr, String lsenport, String userName,
String pswd) {
this.ftpServerAddress = serverAddr;
this.port = Integer.parseInt(lsenport);
this.user = userName;
this.password = pswd;
}

/**
* FTP 服务器地址
*/
private String ftpServerAddress = null;
/**
* FTP 服务端口
*/
private int port = 21;
/**
* FTP 用户名
*/
private String user = null;
/**
* FTP 密码
*/
private String password = null;
/**
* FTP 数据传输超时时间
*/
private int timeout = 0;
/**
* 异常：登录失败
*/
private final I2HFException EXCEPTION_LOGIN = new I2HFException("COR101",
"FTP服务器登录失败");
/**
* 异常：文件传输失败
*/
private final I2HFException EXCEPTION_FILE_TRANSFER = new I2HFException(
"COR010", "FTP文件传输失败");
/**
* 异常：IO异常
*/
private final I2HFException EXCEPTION_GENERAL = new I2HFException("COR010",
"FTP IO 异常");
private static final Logger logger = Logger.getLogger(FtpService.class);

/**
* 初始化FTP连接，并进行用户登录
*
* @return FTPClient
* @throws I2HFException
*/
public FTPClient initConnection() throws I2HFException {
FTPClient ftp = new FTPClient();
try {
// 连接到FTP
ftp.connect(ftpServerAddress, port);
int reply = ftp.getReplyCode();
if (!FTPReply.isPositiveCompletion(reply)) {
ftp.disconnect();
throw new I2HFException("COR010", "FTP服务器连接失败");
}
// 登录
if (!ftp.login(user, password)) {
throw EXCEPTION_LOGIN;
}
// 传输模式使用passive
ftp.enterLocalPassiveMode();
// 设置数据传输超时时间
ftp.setDataTimeout(timeout);
logger.info("FTP服务器[" + ftpServerAddress + " : " + port + "]登录成功");
} catch (I2HFException te) {
logger.info(te.errorMessage, te);
throw te;
} catch (IOException ioe) {
logger.info(ioe.getMessage(), ioe);
throw EXCEPTION_LOGIN;
}
return ftp;
}

/**
* 设置传输方式
*
* @param ftp
* @param binaryFile
* true:二进制/false:ASCII
* @throws I2HFException
*/
public void setTransferMode(FTPClient ftp, boolean binaryFile)
throws I2HFException {
try {
if (binaryFile) {
ftp.setFileType(FTP.BINARY_FILE_TYPE);
logger.info("FTP文件传输方式为：二进制");
} else {
ftp.setFileType(FTP.ASCII_FILE_TYPE);
logger.info("FTP文件传输方式为：ASCII");
}
} catch (IOException ex) {
logger.info(ex.getMessage(), ex);
throw EXCEPTION_GENERAL;
}
}

/**
* 在当前工作目录下建立多级目录结构
*
* @param ftp
* @param dir
* @throws I2HFException
*/
public void makeMultiDirectory(FTPClient ftp, String dir)
throws I2HFException {
try {
StringBuffer fullDirectory = new StringBuffer();
StringTokenizer toke = new StringTokenizer(dir, "/");
while (toke.hasMoreElements()) {
String currentDirectory = (String) toke.nextElement();
fullDirectory.append(currentDirectory);
ftp.makeDirectory(fullDirectory.toString());
if (toke.hasMoreElements()) {
fullDirectory.append('/');
}
}
} catch (IOException ex) {
logger.info(ex.getMessage(), ex);
throw EXCEPTION_GENERAL;
}
}

/**
* 更改服务器当前路径
*
* @param ftp
* @param dir
* @throws I2HFException
*/
public void changeWorkingDirectory(FTPClient ftp, String dir)
throws I2HFException {
try {
if (!ftp.changeWorkingDirectory(dir)) {
throw new I2HFException("COR010", "目录[ " + dir + "]进入失败");
}
} catch (I2HFException tfe) {
logger.info(tfe.errorMessage, tfe);
throw tfe;
} catch (IOException ioe) {
logger.info(ioe.getMessage(), ioe);
throw EXCEPTION_GENERAL;
}
}

/**
* 上传文件到FTP服务器
*
* @param ftp
* @param localFilePathName
* @param remoteFilePathName
* @throws I2HFException
*/
public void uploadFile(FTPClient ftp, String localFilePathName,
String remoteFilePathName) throws I2HFException {
InputStream input = null;
try {
input = new FileInputStream(localFilePathName);
boolean result = ftp.storeFile(remoteFilePathName, input);
if (!result) {
// 文件上传失败
throw EXCEPTION_FILE_TRANSFER;
}
logger.info("文件成功上传到FTP服务器");
} catch (I2HFException tfe) {
logger.info(tfe.getMessage(), tfe);
throw tfe;
} catch (IOException ioe) {
logger.info(ioe.getMessage(), ioe);
throw EXCEPTION_FILE_TRANSFER;
} finally {
try {
if (input != null) {
input.close();
}
} catch (IOException ex) {
logger.info("FTP对象关闭异常", ex);
}
}
}

/**
* 下载文件到本地
*
* @param ftp
* @param remoteFilePathName
* @param localFilePathName
* @throws I2HFException
*/
public void downloadFile(FTPClient ftp, String remoteFilePathName,
String localFilePathName) throws I2HFException {
boolean downloadResult = false;
OutputStream output = null;
try {
output = new FileOutputStream(localFilePathName);
downloadResult = ftp.retrieveFile(remoteFilePathName, output);
if (!downloadResult) {
// 如果是文件不存在将异常抛出
throw new I2HFException("COR011", "文件不存在");
}
logger.info("文件成功从FTP服务器下载");
} catch (I2HFException tfe) {
logger.error(tfe.getMessage(), tfe);
throw tfe;
} catch (IOException ex) {
logger.error(ex.getMessage(), ex);
throw EXCEPTION_FILE_TRANSFER;
} finally {
try {
if (output != null) {
output.close();
}
if (!downloadResult) {
new File(localFilePathName).delete();
}
} catch (IOException ex) {
logger.error("FTP对象关闭异常", ex);
}
}
}

/**
* Method setFtpServerAddress.
*
* @param ftpServerAddress
* String
*/
public void setFtpServerAddress(String ftpServerAddress) {
this.ftpServerAddress = ftpServerAddress;
}

/**
* Method setUser.
*
* @param user
* String
*/
public void setUser(String user) {
this.user = user;
}

/**
* Method setPassword.
*
* @param password
* String
*/
public void setPassword(String password) {
this.password = password;
}

/**
* Method setTimeout.
*
* @param timeout
* String
*/
public void setTimeout(String timeout) {
try {
this.timeout = Integer.parseInt(timeout);
} catch (NumberFormatException ex) {
// 默认超时时间500毫秒
this.timeout = 500;
}
}

/**
* Method setPort.
*
* @param port
* String
*/
public void setPort(String port) {
try {
this.port = Integer.parseInt(port);
} catch (NumberFormatException ex) {
// 默认端口21
this.port = 21;
}
}
}
=====================================
jsp上传部分
===================================
<form method="post" name="uploadform" id="uploadform" action="upload" ENCTYPE="multipart/form-data">

<input type="hidden" name="service" value="com.jbsoft.i2hf.corpor.services.CstBatchBizServices.exclUpload"/>
<table cellspacing="0" cellpadding="0">
<tr>
<td width="20%" align="right">上传本地文件：</td>
<td width="80%"><input class="" style="width:300px" type="file" width="300px" name="exclname" id="exclname"/></td>
</tr>
</table>
</form>
============================================
上传的servlet用的是smartupload
，部分代码可以参考一下：
==========================================
SmartUpload su = new SmartUpload();
su.setCharset("UTF-8");
su.initialize(getServletConfig(), request, response);
su.setMaxFileSize(10240000);
su.setTotalMaxFileSize(102400000);
su.setAllowedFilesList("xls");
su.upload();
===========================================
代码里面有一些客户的信息，不能全部给你哈

Ⅳ java ftp上传时断网，文件损坏

以二进制流上传，然后实现断点续传。

/**
* 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{
FTPClient ftpClient = new FTPClient();
//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);
UploadStatus 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 {
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;
}
}
}
}

//检查远程是否存在文件
FTPFile[] files = ftpClient.listFiles(remoteFileName);
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
InputStream is = new FileInputStream(f);
if(is.skip(remoteSize)==remoteSize){
ftpClient.setRestartOffset(remoteSize);
if(ftpClient.storeFile(remote, is)){
return UploadStatus.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 UploadStatus.Delete_Remote_Faild;
}
is = new FileInputStream(f);
if(ftpClient.storeFile(remote, is)){
result = UploadStatus.Upload_New_File_Success;
}else{
result = UploadStatus.Upload_New_File_Failed;
}
is.close();
}else {
InputStream is = new FileInputStream(local);
if(ftpClient.storeFile(remoteFileName, is)){
result = UploadStatus.Upload_New_File_Success;
}else{
result = UploadStatus.Upload_New_File_Failed;
}
is.close();
}
return result;
}

Ⅳ java程序在linux系统下运行上传文件到ftp服务器出错代码 “451 参数错误”

请检查磁盘空间
451 上传不能继续，使用的硬盘空间已经达到用户的硬盘配额上限