java常用工具类UploadHelper

/**
 * 上传文件类
 */
package com.gootrip.util;


/**
 * @author advance
 *
 */
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.FilenameFilter;
import java.io.PrintWriter;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;


import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;


public class UploadHelper {

public final static String separator = "/";
public final static String split = "_";

protected final Log log = LogFactory.getLog(getClass());


class FilenameFilterImpl implements FilenameFilter 
{
private String filter = ".";

public FilenameFilterImpl(String aFilter)
{
filter = aFilter;
}

    public boolean accept(File dir, String name) 
    {
        return name.startsWith(filter);
    }
};
/**
* 获得当前的文件路径（通过当前日期生成）
* @param basePath
* @return
*/
public static String getNowFilePath(String basePath){
SimpleDateFormat formater =new SimpleDateFormat("yyyy-MM-dd");
String pathName = formater.format(new Date());
File dir = new File(basePath + separator + pathName);
if(!dir.exists())
dir.mkdir();
return pathName;
}

public static String getNewFileName(String oldFileName){
oldFileName = oldFileName.replaceAll("'", "").replaceAll("\"", "");
Calendar date = Calendar.getInstance();
int hour = date.get(Calendar.HOUR_OF_DAY);
int minute = date.get(Calendar.MINUTE);
int second = date.get(Calendar.SECOND);
if(oldFileName.length()>30)
oldFileName = oldFileName.substring(oldFileName.length()-30);
return (new Integer(hour*3600 + minute*60 + second).toString()) 
+ split + oldFileName;
}

public static String getThumbFileName(String fileName){
int pos = fileName.lastIndexOf(".");
if(pos>=0)
return fileName.substring(0, pos) + "s" + fileName.substring(pos);
else
return fileName + "s";
}

    /**
    * This method checks if the given file exists on disk. If it does it's ignored because
    * that means that the file is allready cached on the server. If not we dump
    * the text on it.
    */
public void dumpAttributeToFile(String attributeValue, String fileName, String filePath) throws Exception
{
File outputFile = new File(filePath + separator + fileName);
PrintWriter pw = new PrintWriter(new FileWriter(outputFile));
        pw.println(attributeValue);    
        pw.close();
}

  /**
  * 保存文件
    * This method checks if the given file exists on disk. If it does it's ignored because
    * that means that the file is allready cached on the server. If not we take out the stream from the 
    * digitalAsset-object and dumps it.
    */
public void dumpAsset(File file, String fileName, String filePath) throws Exception
{
long timer = System.currentTimeMillis();

File outputFile = new File(filePath + separator + fileName);
if(outputFile.exists())
{
log.info("The file allready exists so we don't need to dump it again..");
return;
}

FileOutputStream fis = new FileOutputStream(outputFile);
BufferedOutputStream bos = new BufferedOutputStream(fis);

BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));

int character;
        while ((character = bis.read()) != -1)
        {
bos.write(character);
        }
bos.flush();

        bis.close();
fis.close();
bos.close();
log.info("Time for dumping file " + fileName + ":" + (System.currentTimeMillis() - timer));
}


/**
* 保存缩略图
* This method checks if the given file exists on disk. If it does it's ignored because
* that means that the file is allready cached on the server. If not we take out the stream from the 
* digitalAsset-object and dumps a thumbnail to it.
*/
   
public void dumpAssetThumbnail(File file, String fileName, String thumbnailFile, String filePath, int width, int height, int quality) throws Exception
{
long timer = System.currentTimeMillis();
log.info("fileName:" + fileName);
log.info("thumbnailFile:" + thumbnailFile);

File outputFile = new File(filePath + separator + thumbnailFile);
if(outputFile.exists())
{
log.info("The file allready exists so we don't need to dump it again..");
return;
}

ThumbnailGenerator tg = new ThumbnailGenerator();
tg.transform(filePath + separator + fileName, filePath + separator + thumbnailFile, width, height, quality);

log.info("Time for dumping file " + fileName + ":" + (System.currentTimeMillis() - timer));
}

/**
* This method removes all images in the digitalAsset directory which belongs to a certain digital asset.
*/
public void deleteDigitalAssets(String filePath, String filePrefix) throws Exception
{ 
try
{
File assetDirectory = new File(filePath);
File[] files = assetDirectory.listFiles(new FilenameFilterImpl(filePrefix));
for(int i=0; i<files.length; i++)
{
File file = files[i];
log.info("Deleting file " + file.getPath());
file.delete();
}
}
catch(Exception e)
{
log.error("Could not delete the assets for the digitalAsset " + filePrefix + ":" + e.getMessage(), e);
}
}


}