Java-UploadHelper工具类

/**
 * 上传文件类
 */
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);
        }
    }

}