知识大全设计模

Posted 2022-07-18 文件

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　　近段要实现一个上传excel文件到服务器并把excel文件的数据导入到数据库表中的功能 excel文件有两种格式对应数据库两张表我先实现了其中一种excel格式式的上传和导入数据上传的功能是一样的没什么好说的不同的是两种excel文件格式不一样对应的数据库表的字段也不一样怎么办呢？开始的时候我先做了一个excel文件的功能做另一个很相似了运用c/p大法就搞定了:) 代码是这样的 action中: CityDayService cds = new CityDayServiceImpl(); ImpExcelData impExcelData = new ImpExcelData(filePath ); //这里从excel文件中取出数据 try List list = impExcelData getData(); //放进list中用的是jxl List<CityDay> sameList = cds sameList(list);//这里有不同

　　//boolean isOk = cds checkExcel(list); if (sameList size()> ) request setAttribute( sameList sameList); request setAttribute( echo 以下数据有重复是否覆蓋 ); return mapping findForward( upload ); else

　　cds add(list);//这里有不同 System out print( ); catch (Exception e) // TODO Auto generated catch block e printStackTrace();

　　另一种格式的excel文件对应的action是这样的

　　/* 导入表 */

　　 ZhbTCityDayForecastService cds = new ZhbTCityDayForecastServiceImpl();///////////////// ImpExcelData impExcelData = new ImpExcelData(filePath ); try List list = impExcelData getData(); List<ZhbTCityDayForecast> sameList = cds sameList(list);//////////////////// if (sameList size()> ) request setAttribute( sameList sameList); request setAttribute( echo 数据有重复是否覆蓋 ); return mapping findForward( upload ); else

　　cds add(list);/////////////////////////////// System out print( ); catch (Exception e) // TODO Auto generated catch block e printStackTrace();

业务层:

　　 public interface CityDayService public List findByCityAndDate(String city Date date); public void deleteSame(List excelDataList); public void add(List excelDatalist); public List sameList(List excelDatalist); 和 public interface ZhbTCityDayForecastService public List findByCityAndDate(String city Date date); public void deleteSame(List excelDataList); public void add(List excelDatalist); public List sameList(List excelDatalist);

　　业务层实现类:

　　 public class CityDayServiceImpl implements CityDayService

　　public List findByCityAndDate(String city Date date) CityDayDAO cdd = new CityDayDAOImpl(); return cdd findByCityAndDate(city date);

　　public void add(List excelDatalist) Session session = HibernateSessionFactory getSession(); Transaction tran = session beginTransaction(); List<CityDay> newList = new ArrayList(); for (int i = ; i < excelDatalist size(); i++) HashMap map = (HashMap) excelDatalist get(i); String strDate = map get( ) + ; Date date; try date = new SimpleDateFormat( yyyy MM dd ) parse(strDate); CityDayDAO cdd = new CityDayDAOImpl(); CityDay cd = new CityDay(); cd setDate(date); cd setCity(map get( ) + ); cd setPollutionIndeces(new Integer(map get( )+ )); cd setMainPollutant(map get( ) toString()); cd setGrade(map get( ) toString()); cd setStatus(map get( ) toString()); cdd saveOrUpdate(cd); catch (ParseException e) tran rollback(); e printStackTrace();

　　 mit();

　　public void deleteSame(List excelDataList)

　　CityDayDAO cdd = new CityDayDAOImpl(); boolean result = true; List<CityDay> list = new ArrayList<CityDay>(); for (int i = ; i < excelDataList size(); i++) HashMap map = (HashMap) excelDataList get(i); String city = map get( ) + ; String strDate = map get( ) + ; Date date; try date = new SimpleDateFormat( yyyy MM dd ) parse(strDate); List onelist = cdd findByCityAndDate(city date); for(int j= ;j<onelist size();j++) list add((CityDay)onelist get(j)); catch (ParseException e) // TODO Auto generated catch block e printStackTrace();

　　 for(int j= ;j<list size();j++) CityDay cd = (CityDay)list get(j); System out println( 要删除的数据有:\\n + city: +cd getCity()+ date: + cd getDate()); cdd delete(list);

　　public List<CityDay> sameList(List excelDatalist) CityDayDAO cdd = new CityDayDAOImpl(); boolean result = true; List<CityDay> list = new ArrayList<CityDay>(); for (int i = ; i < excelDatalist size(); i++) HashMap map = (HashMap) excelDatalist get(i); String city = map get( ) + ; String strDate = map get( ) + ; Date date; try date = new SimpleDateFormat( yyyy MM dd ) parse(strDate); List onelist = cdd findByCityAndDate(city date); for(int j= ;j<onelist size();j++) list add((CityDay)onelist get(j)); catch (ParseException e) // TODO Auto generated catch block e printStackTrace();

　　 for(int j= ;j<list size();j++) CityDay cd = (CityDay)list get(j); System out println( 重复的数据有:\\n + city: +cd getCity()+ date: + cd getDate()); return list;

　　和

　　public class ZhbTCityDayForecastServiceImpl implements ZhbTCityDayForecastService

　　public List findByCityAndDate(String city Date date) ZhbTCityDayForecastDAO cdd = new ZhbTCityDayForecastDAOImpl(); return cdd findByCityAndDate(city date);

　　public void add(List excelDatalist) Session session = HibernateSessionFactory getSession(); Transaction tran = session beginTransaction(); List<CityDay> newList = new ArrayList(); for (int i = ; i < excelDatalist size(); i++) HashMap map = (HashMap) excelDatalist get(i); String strDate = map get( )+ +map get( )+ +map get( ) + ; Date date; try date = new SimpleDateFormat( yyyy MM dd ) parse(strDate); ZhbTCityDayForecastDAO cdd = new ZhbTCityDayForecastDAOImpl(); ZhbTCityDayForecast cd = new ZhbTCityDayForecast(); cd setCity(map get( ) + ); cd setDate(date); cd setPollutionMin(new Integer(map get( )+ )); cd setPollutionMax(new Integer(map get( )+ )); cd setMainPollutant(map get( )+ ); cd setGrade(map get( ) toString()); cd setStatus(map get( ) toString()); cdd saveOrUpdate(cd); catch (ParseException e) tran rollback(); e printStackTrace();

　　 mit(); public void deleteSame(List excelDataList)

　　ZhbTCityDayForecastDAO cdd = new ZhbTCityDayForecastDAOImpl(); boolean result = true; List<ZhbTCityDayForecast> list = new ArrayList<ZhbTCityDayForecast>(); for (int i = ; i < excelDataList size(); i++) HashMap map = (HashMap) excelDataList get(i); String city = map get( ) + ; String strDate = map get( )+ +map get( )+ +map get( ) + ; Date date; try date = new SimpleDateFormat( yyyy MM dd ) parse(strDate); List<ZhbTCityDayForecast> onelist = cdd findByCityAndDate(city date); for(int j= ;j<onelist size();j++) list add((ZhbTCityDayForecast)onelist get(j)); catch (ParseException e) // TODO Auto generated catch block e printStackTrace();

　　 cdd delete(list);

　　public List<ZhbTCityDayForecast> sameList(List excelDatalist) // TODO Auto generated method stub ZhbTCityDayForecastDAO cdd = new ZhbTCityDayForecastDAOImpl(); List<ZhbTCityDayForecast> list = new ArrayList<ZhbTCityDayForecast>(); for (int i = ; i < excelDatalist size(); i++) HashMap map = (HashMap) excelDatalist get(i); String city = map get( ) + ; String strDate = map get( )+ +map get( )+ +map get( ) + ; Date date; try date = new SimpleDateFormat( yyyy MM dd ) parse(strDate); List onelist = cdd findByCityAndDate(city date); for(int j= ;j<onelist size();j++) list add((ZhbTCityDayForecast)onelist get(j)); catch (ParseException e) // TODO Auto generated catch block e printStackTrace(); return list;

　　这样做完后自己感觉很不满意因为两个相似的功能写了两遍代码:两个action service 还有两个页面很笨如果以后需求增加再写其它的excel格式岂不是很惨又要用cp大法了初步的思路是只一个action和一个页面经过思索发现只有service层的 public void add(List excelDatalist); public List sameList(List excelDatalist); public void deleteSame(List excelDataList); 三个方法是不同的

　　那么在action中可以根据参数生成不同的service 执行不同的service中的service方法可以用工厂方法生产出不同的service 思路有了开干

　　首先把这三个方法提到一个接口里来 public interface CommonUploadService public void add(List excelDatalist); public List sameList(List excelDatalist); public void deleteSame(List excelDataList);

　　原为的service就变成这样 public interface CityDayService extends CommonUploadService public List findByCityAndDate(String city Date date);

　　public interface ZhbTCityDayForecastService extends CommonUploadService public List findByCityAndDate(String city Date date);

　　实现类不用变

　　工厂方法 public class UploadServiceFactory

　　private static CommonUploadService cus;

　　private static final String cityDayService = xxx datacenter upload service CityDayServiceImpl ;

　　private static final String foreCastService = xxx datacenter upload forecast service CityDayServiceImpl ;

　　private UploadServiceFactory()

　　public static CommonUploadService getInstance(String type) try if ( daily equals(type)) Class cls = Class forName(cityDayService); cus = (CommonUploadService) cls newInstance(); if ( forecast equals(type)) Class cls = Class forName(foreCastService); cus = (CommonUploadService) cls newInstance(); catch (Exception e) e printStackTrace(); return cus;

　　改造后的action /* 导入表 */ // CityDayService cds = new CityDayServiceImpl();//这里有不同可以用工厂方法根据参数type不同构造出 String type = request getParameter( type ); CommonUploadService cds = UploadServiceFactory getInstance(type); ImpExcelData impExcelData = new ImpExcelData(filePath ); try List list = impExcelData getData(); List<CityDay> sameList = cds sameList(list);//这里有不同

　　cds add(list);//这里有不同 System out print( ); catch (Exception e) // TODO Auto generated catch block e printStackTrace();

　　这样一个action就可以搞定了如果以为要增加新格式的excel文件只实现CommonUploadService方法改造一下工厂类就ok了

cha138/Article/program/Java/gj/201311/27596

知识大全 设计模

知识大全设计模