datasummary.java

MVC结构开发简单例子 非常实用的..有学习MVC的可以看看.

package com.mvc.bean.summary;

import java.util.List;
import java.util.ArrayList;

import javax.servlet.http.HttpSession;
import java.io.IOException;
import java.util.HashMap;
import java.util.Set;
import java.util.Iterator;
import com.mvc.bean.Charge;
import com.mvc.constant.Constant;

public class DataSummary {
  public DataSummary(){}

  public List getSummaryList( HttpSession session )
    throws IOException{
    List summaryList = new ArrayList();

    HashMap map = ( HashMap )session.getAttribute(Constant.HASHMAPKEY);

    if( map != null ){
      Set keysSet = map.keySet();
      Iterator keys = keysSet.iterator();

      while( keys.hasNext() ){
        String key = ( String )keys.next();
        summaryList.add( ( Charge )map.get( key ) );
      }
    }else{
      throw new IOException("All Input Data Lost");
    }

    return summaryList;
  }
}