java if在内存中_java如何将对象暂存到内存中？
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form表單提交文件，建議用62616964757a686964616fe59b9ee7ad9431333264623862smartupload上傳，暫存在web服務器目錄下，然后稍微一下下面的代碼，ftp上傳后，刪除暫存文件，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 服務類，對Apache的commons.net.ftp進行了包裝
* 依賴庫文件：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 服務器地址
*/
private String ftpServerAddress = null;
/**
* FTP 服務端口
*/
private int port = 21;
/**
* FTP 用戶名
*/
private String user = null;
/**
* FTP 密碼
*/
private String password = null;
/**
* FTP 數據傳輸超時時間
*/
private int timeout = 0;
/**
* 異常：登錄失敗
*/
private final I2HFException EXCEPTION_LOGIN = new I2HFException("COR101",
"FTP服務器登錄失敗");
/**
* 異常：文件傳輸失敗
*/
private final I2HFException EXCEPTION_FILE_TRANSFER = new I2HFException(
"COR010", "FTP文件傳輸失敗");
/**
* 異常：IO異常
*/
private final I2HFException EXCEPTION_GENERAL = new I2HFException("COR010",
"FTP IO 異常");
private static final Logger logger = Logger.getLogger(FtpService.class);
/**
* 初始化FTP連接，并進行用戶登錄
*
* @return FTPClient
* @throws I2HFException
*/
public FTPClient initConnection() throws I2HFException {
FTPClient ftp = new FTPClient();
try {
// 連接到FTP
ftp.connect(ftpServerAddress, port);
int reply = ftp.getReplyCode();
if (!FTPReply.isPositiveCompletion(reply)) {
ftp.disconnect();
throw new I2HFException("COR010", "FTP服務器連接失敗");
}
// 登錄
if (!ftp.login(user, password)) {
throw EXCEPTION_LOGIN;
}
// 傳輸模式使用passive
ftp.enterLocalPassiveMode();
// 設置數據傳輸超時時間
ftp.setDataTimeout(timeout);
logger.info("FTP服務器[" + ftpServerAddress + " : " + port + "]登錄成功");
} catch (I2HFException te) {
logger.info(te.errorMessage, te);
throw te;
} catch (IOException ioe) {
logger.info(ioe.getMessage(), ioe);
throw EXCEPTION_LOGIN;
}
return ftp;
}
/**
* 設置傳輸方式
*
* @param ftp
* @param binaryFile
* true:二進制/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文件傳輸方式為：二進制");
} else {
ftp.setFileType(FTP.ASCII_FILE_TYPE);
logger.info("FTP文件傳輸方式為：ASCII");
}
} catch (IOException ex) {
logger.info(ex.getMessage(), ex);
throw EXCEPTION_GENERAL;
}
}
/**
* 在當前工作目錄下建立多級目錄結構
*
* @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;
}
}
/**
* 更改服務器當前路徑
*
* @param ftp
* @param dir
* @throws I2HFException
*/
public void changeWorkingDirectory(FTPClient ftp, String dir)
throws I2HFException {
try {
if (!ftp.changeWorkingDirectory(dir)) {
throw new I2HFException("COR010", "目錄[ " + dir + "]進入失敗");
}
} catch (I2HFException tfe) {
logger.info(tfe.errorMessage, tfe);
throw tfe;
} catch (IOException ioe) {
logger.info(ioe.getMessage(), ioe);
throw EXCEPTION_GENERAL;
}
}
/**
* 上傳文件到FTP服務器
*
* @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) {
// 文件上傳失敗
throw EXCEPTION_FILE_TRANSFER;
}
logger.info("文件成功上傳到FTP服務器");
} 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對象關閉異常", ex);
}
}
}
/**
* 下載文件到本地
*
* @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) {
// 如果是文件不存在將異常拋出
throw new I2HFException("COR011", "文件不存在");
}
logger.info("文件成功從FTP服務器下載");
} 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對象關閉異常", 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) {
// 默認超時時間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) {
// 默認端口21
this.port = 21;
}
}
}
=====================================
jsp上傳部分
===================================
| 上傳本地文件： |
============================================
上傳的servlet用的是smartupload
，部分代碼可以參考一下：
==========================================
SmartUpload su = new SmartUpload();
su.setCharset("UTF-8");
su.initialize(getServletConfig(), request, response);
su.setMaxFileSize(10240000);
su.setTotalMaxFileSize(102400000);
su.setAllowedFilesList("xls");
su.upload();
===========================================
代碼里面有一些客戶的信息，不能全部給你哈
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