waysun一路陽光

1.ExcelManagerFactory
package com.factory;

public class ExcelManagerFactory {
   private static String key = "key";
   private ExcelManagerFactory() {
   }
  
   private static ExcelManagerIf instance = null;
   public static ExcelManagerIf getInstance(){
    if(instance == null){
             synchronized(key){
                 if(instance == null){
                     instance = new ExcelManagerImpl();
                 }
             }
         }
         return instance;
   }
}

2.聲明一個接口

package com.factory;

import java.io.InputStream;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;

import javax.servlet.http.HttpServletResponse;

import com.gpdi.orm.object.ScoreRecordDetail;

public interface ExcelManagerIf {
 
 public boolean export(HttpServletResponse response, List<ScoreRecordDetail> list,LinkedHashMap hashMap);
 /********************************************************************************************************/
 public boolean export1(HttpServletResponse response,List list,LinkedHashMap hashMap);
 /********************************************************************************************************/

}
3.實現接口的類

package com.factory;

import java.io.IOException;

public class ExcelManagerImpl implements ExcelManagerIf
{
         public boolean export1(HttpServletResponse response, List list,LinkedHashMap hashMap)
         {
                    //實現具體功能的代碼實現
         }
}
4.調用
  HttpServletResponse response=null;
  LinkedHashMap hm = new LinkedHashMap();
  List list = Object.getList();
   ExcelManagerIf eem = ExcelManagerFactory.getInstance();
   /******************************************************************/
   eem.export(response, list,hm);