beancontroler.java

servlet上传下载

package shubin.sample.upload;

/**
 * Title: 类控制器
 *
 * Description: 主要作用是对FileUploadStatus进行管理，为客户端提供相应的
 * FileUploadStatus类对象。这是一个单例类。
 *
 */
import java.util.Vector;
public class BeanControler {
     private static BeanControler beanControler = new BeanControler();
     private Vector vector = new Vector();
     private BeanControler() {
     }
     public static BeanControler getInstance() {
         return beanControler;
     }
     /**
      * 取得相应FileUploadStatus类对象的存储位置
      */
     private int indexOf(String strID) {
         int nReturn = -1;
         for (int i = 0; i < vector.size(); i++) {
             FileUploadStatus status = (FileUploadStatus) vector.elementAt(i);
             if (status.getUploadAddr().equals(strID)) {
                 nReturn = i;
                 break;
             }
         }
         return nReturn;
     }
     /**
      * 取得相应FileUploadStatus类对象
      */
     public FileUploadStatus getUploadStatus(String strID) {
         return (FileUploadStatus) vector.elementAt(indexOf(strID));
     }
     /**
      * 存储FileUploadStatus类对象
      */
     public void setUploadStatus(FileUploadStatus status) {
         int nIndex = indexOf(status.getUploadAddr());
         if ( -1 == nIndex) {
             vector.add(status);
         } else {
             vector.insertElementAt(status, nIndex);
             vector.removeElementAt(nIndex + 1);
         }
     }
     /**
      * 删除FileUploadStatus类对象
      */
     public void removeUploadStatus(String strID){
         int nIndex = indexOf(strID);
         if(-1!=nIndex)
             vector.removeElementAt(nIndex);
     }
}