files.java

初学者学习用的文件上传代码

//***********************************************
 //Copyright 2002 by BHH丂All Rights Reverved.
 //
 //僔僗僥儉柤          :BestProject
 //僒僽僔僗僥儉柤      :忈奞娗棟
 //
 //===============================================
 //version   曄峏擔         曄峏幰           曄峏撪梕
 //-----------------------------------------------
 //01-00     2002.1.21    丂棝埞愇          峏怴嶌惉
 package bestproject.upload;

import java.io.*;
import java.util.*;

public class Files {

  Files() {
    m_files = new Hashtable();
    m_counter = 0;
  }

  /**
   *僼傽僀儖儕僗僩偵僼傽僀儖傪揧晅偡傞
   *@param  newFile  File
   *@since 01-00
   */
  protected void addFile(File newFile) {
    if (newFile == null) {
      throw new IllegalArgumentException("newFile cannot be null.");
    }
    else {
      m_files.put(new Integer(m_counter), newFile);
      m_counter++;
      return;
    }
  }

  /**
   *僼傽僀儖儕僗僩偵僼傽僀儖傪庢傞
   *@param  index  int
   *@return File
   *@since 01-00
   */
  public File getFile(int index) {
    if (index < 0) {
      throw new IllegalArgumentException(
          "File's index cannot be a negative value (1210).");
    }
    File retval = (File) m_files.get(new Integer(index));
    if (retval == null) {
      throw new IllegalArgumentException(
          "Files' name is invalid or does not exist (1205).");
    }
    else {
      return retval;
    }
  }

  /**
   *僼傽僀儖儕僗僩偵僼傽僀儖偺悢傪庢傞
   *@return int
   *@since 01-00
   */
  public int getCount() {
    return m_counter;
  }

  /**
   *僼傽僀儖儕僗僩偵僼傽僀儖挿偝傪庢傞
   *@return long
   *@since 01-00
   *@throws IOException
   */
  public long getSize() throws IOException {
    long tmp = 0L;
    for (int i = 0; i < m_counter; i++) {
      tmp += getFile(i).getSize();

    }
    return tmp;
  }

  /**
   *僼傽僀儖儕僗僩偵僼傽僀儖廤傪庢傞
   *@return Collection
   *@since 01-00
   */
  public Collection getCollection() {
    return m_files.values();
  }

  /**
   *僼傽僀儖儕僗僩偵僼傽僀儖尦傪庢傞
   *@return Enumeration
   *@since 01-00
   */
  public Enumeration getEnumeration() {
    return m_files.elements();
  }

  private FileUpload m_parent;
  private Hashtable m_files;
  private int m_counter;
}