将List集合中的map对象转为List形式--封装类

 import java.util.ArrayList;

    import java.util.HashMap;

    import java.util.Iterator;

    import java.util.List;

    import java.util.Map;

 

    import org.apache.commons.beanutils.ConvertUtils;

    import org.apache.commons.beanutils.PropertyUtils;

 

    public class EntityBean {

 

    /**

    * 此方法实现JDBCTemplate

    * 返回的Map集合对数据的自动

    * 封装功能

    * List集合存储着一系列的MAP

    * 对象，obj为一个javaBean

    * @param listMap集合

    * @param objjavaBean对象

    * @return

    */

        public List parse(List list,Class obj){

               //生成集合

               ArrayList ary = new ArrayList();

               //遍历集合中的所有数据

               for(int i = 0; i

                try {

                 生成对象实历 将MAP中的所有参数封装到对象中

                 Object o = this.addProperty( (Map)list.get(i),

                                        obj.newInstance() );

                 //把对象加入到集合中

                 ary.add(o);

                } catch (InstantiationException e) {

                 // TODO Auto-generated catch block

                 e.printStackTrace();

                } catch (IllegalAccessException e) {

                 // TODO Auto-generated catch block

                 e.printStackTrace();

                }

               }

               //返回封装好的集合

               return list;

            }

 

 

 

    /**Map对象中的值为 name=aaa,value=bbb

    调用方法 

    addProperty(map,user);

    *将自动将map中的值赋给user类

    *此方法结合Spring框架的jdbcTemplete将非

    *常有用 

    * @param map存储着名称和值集合

    * @param obj要封装的对象

    * @return封装好的对象

    */

    public Object addProperty(Map map,Object obj){

       //遍历所有名称

       Iterator it = map.keySet().iterator();

       while(it.hasNext()){

        //取得名称

        String name = it.next().toString();

        //取得值

        String value = map.get(name).toString();

 

        try{

         //取得值的类形

         Class type = PropertyUtils.getPropertyType(obj, name);

 

         if(type!=null){

          //设置参数

          PropertyUtils.setProperty(obj, name,ConvertUtils.convert(value, type));

 

         }

        }catch(Exception ex){

         ex.printStackTrace();

        }

 

       }

       return obj;

 

    }

 

    }

 

//使用方法

List stuGroupList2=new ArrayList();

EntityBean entbean=new EntityBean();

for (DynaBean stubean : stuGroupList) {

if (stubean.get("GROUP_ID") != null&& stubean.get("GROUP_ID").equals(group_id)) {

LinkedHashMap map=new LinkedHashMap();

map.put("choose_id", stubean.get("CHOOSE_ID"));

map.put("group_user_typecode", stubean.get("GROUP_USER_TYPECODE"));

map.put("group_id", stubean.get("GROUP_ID"));

map.put("realname", stubean.get("REALNAME"));

stuGroupList2.add(map);

}

}

stuGroupList2=entbean.parse(stuGroupList2, stuGroup.class);