文件上传和文件下载代码,Java代码库,德仔网

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【Java】文件上传和文件下载
作者:WallenHeng / 发布于2014/1/6/ 449
package com.nbcedu.function.ehdNotice.util;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
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.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;

import javax.servlet.http.HttpServletResponse;

/**
* 扩展FileUtils
* @author WallenHeng
* @date 2013-12-20 上午11:16:46
*/

public class FileUtils extends org.apache.commons.io.FileUtils{
 
 private static final Random JVM_RANDOM=new Random();
 private static final Map<String, DateFormat> DFS = new HashMap<String, DateFormat>();
 private static DateFormat getFormat(String pattern) {
  DateFormat format = DFS.get(pattern);
  if (format == null) {
   format = new SimpleDateFormat(pattern);
   DFS.put(pattern, format);
  }
  return format;
 }
 private static Date getNow(){
  return Calendar.getInstance().getTime();
 }
 /**
  * 是否存在
  * @param file
  * @return
  */
 public static boolean isExists(File file){
  return file!=null&&file.exists();
 }
 /**
  * 获取文件扩展名
  * @param fileName
  * @return
  */
 public static String getFileExtension(String fileName){
  int position = fileName.lastIndexOf(".");
  return fileName.substring(position);
 }
 /**
  * 获取日期结构的目录，如：2013-02/03
  * @param rootPath
  * @return
  * @throws IOException
  */
 public static String forceMkdirOfDate(String rootPath) throws IOException{
  String path=getFormat("yyyyMM"+File.separator+"dd").format(getNow());
  forceMkdir(new File(rootPath+File.separator+path));
  return path;
 }
 /**
  * @return
  */
 public static String getFileName(){
  
  return String.valueOf(System.currentTimeMillis())+Math.abs(JVM_RANDOM.nextInt());
 }
 /**
  * 保存文件到某文件夹
  * @param file
  * @param savePath 绝对路径
  * @param srcFileName 原文件名
  * @return 新文件名
  * @throws IOException
  */
 public static String saveFile(File file,String savePath,String srcFileName) throws IOException{
  String fileName=getFileName()+getFileExtension(srcFileName);
  InputStream is= new BufferedInputStream(new FileInputStream(file));
  OutputStream os= new BufferedOutputStream(new FileOutputStream(new File(savePath+File.separator+fileName)));
  try {
   int len = 0;
   byte[] buffer = new byte[500];
   while (-1 != (len = is.read(buffer))) {
    os.write(buffer, 0, len);
   }
   os.flush();
  } catch (IOException e) {
   throw e;
  }finally{
   close(is, os);
  }
  return fileName;
 }
 
 
 
 /**
  * 输出文件
  * @param file
  * @throws IOException
  */
 public static void outputFile(File file,OutputStream stream) throws IOException{
  BufferedInputStream bis = null;
  BufferedOutputStream bos = null;
  int bytesRead = 0;
  byte[] buffer = new byte[8192];
  try {
   bis = new BufferedInputStream(new FileInputStream(file));
   bos = new BufferedOutputStream(stream);
   while ((bytesRead = bis.read(buffer, 0, 8192)) != -1) {
    bos.write(buffer, 0, bytesRead);
   }
   bos.flush();
  } finally {
   bis.close();
   bos.close();
  }
 }
 /**
  *
  * @param file
  * @param fileName
  * @throws IOException
  */
 public static void downloadFile(File file,String fileName) throws IOException{
  HttpServletResponse response=Struts2Utils.getResponse();
  // 弹出下载对话框(以附件形式打开文件流)
  response.setContentType("APPLICATION/OCTET-STREAM; charset=UTF-8");
  response.setHeader("Content-disposition", "attachment;filename="+ fileName);
  OutputStream stream=response.getOutputStream();
  outputFile(file, stream);
 }
 
 public static void close(InputStream is,OutputStream os){
  if(is!=null){
   try {
    is.close();
   } catch (IOException e) {
   }
  }
  if(os!=null){
   try {
    os.close();
   } catch (IOException e) {
   }
  }
 }
 
}
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