java各类文件上传总结_JAVA_编程开发_程序员俱乐部

/**
?* 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);
??}
?}

}