java各类文件上传总结

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

/**
 * @author advance
 * http://www.jq-school.com
 */
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;
//Download by http://www.codefans.net
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);
  }
 }

}