import java.io.File;
import java.io.UnsupportedEncodingException;
import javax.servlet.http.HttpServletRequest;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import java.util.*;

public class UploadTool {
  private int buffersize = 4096;
  private int SizeMax = 1024 * 1024;// 1Mbyte最大檔案大小
  private File tempfile = null;
  private String def_upload_dir = null;

  // 用來存parameter
  private Map map = null;
  private Map uploadlist = null;

  // 處始化時把給request把所有的值取出,存入map
  public UploadTool(HttpServletRequest request)
throws FileUploadException,
      UnsupportedEncodingException {

    map = new HashMap();
    uploadlist = new HashMap();

    // 建立一個以disk-base的檔案物件
    DiskFileItemFactory factory = new DiskFileItemFactory();

    // 初始化內容
    // 傳送所用的buffer空間
    factory.setSizeThreshold(buffersize);
    // The directory in which temporary files will be located.

    factory.setRepository(tempfile);

    // 建立一個檔案上傳的物件
    ServletFileUpload upload = new ServletFileUpload(factory);

    // 最大檔案大小
    upload.setSizeMax(SizeMax * 10);

    // 每一個Fileitem代表一個form上傳的物件內容ex input type="text"
    List items = null; // 會產生 FileUploadException
    // 把資料從request取出
    items = upload.parseRequest(request); // Parse the request

    Iterator iter = items.iterator();

    while (iter.hasNext()) {// 先把所有參數取得而不先write to file
      FileItem item = (FileItem) iter.next();
      // 一般文字欄位
      if (item.isFormField()) {
        map.put(item.getFieldName(), item.getString("Big5"));
        System.out.println("上傳檔案的其它參數:"
+ item.getFieldName() + "="
            + item.getString("Big5"));
      } else {// 上傳檔案欄位
        // or it's a file upload request

        if (item.getSize() > 0) {
          uploadlist.put(item.getFieldName(), item);
          System.out.println("上傳檔案:" + item.getFieldName());
        }
      }
    }
  }

  // 設定檔案上傳後存放的地方
  public void setUploadDir(String upload_dir) {
    this.def_upload_dir = upload_dir;
  }

  // 取得所有欄位,包含一般欄位及上傳的欄位
  public Map getAllParameter() {
    Map rvalue = new HashMap();
    rvalue.putAll(map);
    rvalue.putAll(uploadlist);
    return rvalue;
  }

  // 取得某一欄位的值,一般欄位
  public String getParameter(String FieldName) {
    if (map.containsKey(FieldName))
      return String.valueOf(map.get(FieldName));
    else
      return null;
  }

  // 取得某一欄位的值,上傳欄位
  public FileItem getUploadParameter(String FieldName) {
    if (uploadlist.containsKey(FieldName))
      return (FileItem) uploadlist.get(FieldName);
    else
      return null;
  }

  // 檢查上傳資料是否正確
  public String checkUpload() {
    Iterator iter = uploadlist.keySet().iterator();
    while (iter.hasNext()) {
      Object Name = iter.next();
      FileItem item = (FileItem) uploadlist.get(Name);
      String itename = item.getName();
      System.out.println("上傳的檔案為:" + itename);
      if (item.getSize() > SizeMax)
        return "檔案太大!";
    }
    return "";
  }

  // 開始上傳
  public String doUpload(FileItem item, String fileName) {
    String str = "";
    long sizeInBytes = item.getSize();
    // 碓認上傳資料是否有誤
    if (sizeInBytes > SizeMax)
      return "檔案太大!";

    if (sizeInBytes > 0) {

      int index = -1;
      String itename = null;
      if ((index = item.getName().lastIndexOf("\\")) != -1)
        itename = item.getName().substring(index,
            item.getName().length());
      else
        itename = item.getName();
      // 副檔名
      String formatName = itename.substring(
itename.length() - 4,
itename
          .length());

      fileName = (fileName + formatName).toLowerCase();

      System.out.println("上傳檔案檔案名稱:" + fileName);

      File uploadedFile = new File(def_upload_dir + fileName);
      // 會產生 Exception
      try {
        item.write(uploadedFile);

      } catch (Exception e) {
        System.out.println("上傳失敗!" + e.toString());
        str = "上傳失敗!";
      }
      // 會產生 Exception

    }
    return str;
  }

  // 是否存在此上傳欄位資料

 
  if(msg.length()>0)
    out.println(msg);
  else
    out.println("上傳成功"+"<br/>");
 
}
%>