小作坊，流水線，代工廠
簡單工廠
由一個工廠對象決定建立哪一種産品類的執行個體，适用于工廠類負責建立的對象較少場景，且用戶端隻需要傳入工廠類的參數，對于如何建立對象不需要關心。
public interface IVideo {
public void record();
}
public class TencentVideo implements IVideo {
@Override
public void record() {
log.info("使用騰訊視訊錄制！");
}
}
public class AlibabaVideo implements IVideo {
@Override
public void record() {
log.info("使用阿裡視訊錄制！");
}
}
public static void main(String[] args) {
IVideo video_1 = new TencentVideo();
video_1.record();
IVideo video_2 = new AlibabaVideo ();
video_2.record();
}
public class VideoFactory {
public IVideo create(String name) {
if ("Tencent".equals(name)) {
return new TencentVideo();
} else if ("Alibaba".equals(name)) {
return new AlibabaVideo()
} else {
return null;
}
}
}
public class VideoFactoryTest {
public static void main(String[] args) {
VideoFactory factory = new VideoFactory();
factory.creat("Tencent");
}
}
public class VideoFactory {
public IVideo create(String name) {
if (StringUtils.isNotEmpty()) {
return (IVideo)Class.forName(name).newInstance();
}
}
}
public static void main(String[] args) {
VideoFactory videoFactory = new VideoFactory();
IVideo video = factory.create("com.sfd.spring.TencentVideo");
video.record();
}
public IVideo create(Class<? extends IVideo> clazz) {
if (null != clazz) {
return clazz.newInstance();
}
return null;
}
public static void main(String[] args) {
VideoFactory videoFactory = new VideoFactory();
IVideo video = factory.create(TencentVideo.class);
video.record();
}
簡單工廠應用
JDK 源碼
例如 Calendar 類
// java.util.Calendar#createCalendar
private static Calendar createCalendar(TimeZone zone, Locale aLocale) {
CalendarProvider provider = LocaleProviderAdapter.getAdapter(CalendarProvider.class, aLocale).getCalendarProvider();
if (provider != null) {
return provider.getInstance(zone, aLocale);
}
Calendar cal = null;
if (aLocale.hasExtensions()) {
String caltype = aLocale.getUnicodeLocaleType("ca");
if (caltype != null) {
switch (caltype) {
case "buddhist":
cal = new BuddhistCalendar(zone, aLocale);
break;
case "japanese":
cal = new JapaneseImperialCalendar(zone, aLocale);
break;
case "gregory":
cal = new GregorianCalendar(zone, aLocale);
break;
}
}
}
if (cal == null) {
if (aLocale.getLanguage() == "th" && aLocale.getCountry() == "TH") {
cal = new BuddhistCalendar(zone, aLocale);
} else if (aLocale.getVariant() == "JP" && aLocale.getLanguage() == "ja"
&& aLocale.getCountry() == "JP") {
cal = new JapaneseImperialCalendar(zone, aLocale);
} else {
cal = new GregorianCalendar(zone, aLocale);
}
}
return cal;
}
工廠方法模式
工廠方法模式是指定義一個建立對象的接口，但讓視線這個接口的類來決定執行個體化哪個類，工廠方法模式讓類的執行個體化推遲到子類中進行。
public interface IVideoFactory {
IVideo create();
}
public class TencentVideoFactory implements IVideoFactory {
public IVideo create() {
return new TencentVideo();
}
}
public class AlibabaVideoFactory implements IVideoFactory {
public IVideo create() {
return new AlibabaVideo();
}
}
public static void main(String[] args) {
IVideoFactory factory = new AlibabaVideoFactory();
IVideo video = factory.create();
video.record();
factory = new TencentVideoFactory();
video = factory.create();
video.record();
}
抽象工廠模式
指提供一個建立一系列相關或互相依賴對象的接口，無須指定它們的具體類。用戶端不依賴于産品類執行個體如何被建立、如何被實作細節，強調的是一系列相關的産品對象（屬于同一産品族） 起使用建立對象需要大 重複的代碼需要提供一個産品類的庫，所有的産品以同樣的接口出現，進而使用戶端不依賴于具體實作。
public interface IVideo {
void record();
}
public interface IWord {
void word();
}
public interface IVideoFactory {
IWord createWord();
IVideo createVideo();
}
public class TencentVideo implements IVideo{
@Override
public void record() {
log.info("使用騰訊視訊錄制！");
}
}
public class TencentWord implements IWord{
@Override
public void word() {
log.info("使用騰訊話術！");
}
}
public class TencentFactory implements IVideoFactory {
public IWord createWord() {
return TencentWord();
}
public IWord createVideo() {
return TencentVideo();
}
}
public class AlibabaVideo implements IVideo{
@Override
public void record() {
log.info("使用阿裡視訊錄制！");
}
}
public class AlibabaWord implements IWord{
@Override
public void word() {
log.info("使用阿裡話術！");
}
}
public class AlibabaFactory implements IVideoFactory {
public IWord createWord() {
return AlibabaWord();
}
public IWord createVideo() {
return AlibabaVideo();
}
}
public static void main(String[] args) {
IVideoFactory factory = new TencentVideoFactory();
factory.createWord().word();
factory.createVideo().record();
}
應用
public interface IOcrService {
public Map<String, Map<String,String>> getBankCardInfo(String base64Image);
}
public abstract class ConfigedFactory<T> {
@Autowired
private SpringContext springContext;
protected T getBean() {
String config = PropertiesUtils.get(getConfigKey());
T bean = (T)springContext.getBean(getConfigMapping().get(config));
return bean;
}
protected abstract String getConfigKey();
protected abstract Map<String, Class> getConfigMapping();
}
public class SpringContext implements ApplicationContextAware {
private static ApplicationContext appContext = null;
@Override
public void setApplicationContext(ApplicationContext applicationContext){
appContext = applicationContext;
}
public static <T> T getBean(Class<T> clazz) {
return appContext.getBean(clazz);
}
}
@Service
public class OcrServiceFactory extends ConfigedFactory<IOcrService> implements IOcrService {
private Map<String, Class> configMapping;
public static final String CONFIG_KEY = "sfd.ocr.vendor";
@Override
protected String getConfigKey() {
return CONFIG_KEY;
}
@Override
protected Map<String, Class> getConfigMapping() {
if (configMapping == null) {
configMapping = new HashMap<String, Class>();
configMapping.put("YUNMAI", CloudOcrServiceImpl.class);
configMapping.put("EXOCR", ExOcrServiceImpl.class);
}
return configMapping;
}
@Override
public Map<String, Map<String,String>> getBankCardInfo(String base64Image) {
return getBean().getBankCardInfo(base64Image);
}
}
@Service("EXOCR")
public class ExOcrServiceImpl implements IOcrService {
@Override
public Map<String, Map<String,String>> getBankCardInfo(String base64Image) throws BizException {
Map<String,Map<String,String>> resultMap=new HashMap<>();
// 通路廠商服務
// ......
return resultMap;
}
}
@Service("YUNMAI")
public class CloudOcrServiceImpl implements IOcrService {
@Override
public Map<String, Map<String,String>> getBankCardInfo(String base64Image){
Map<String,Map<String,String>> resultMap=new HashMap<>();
// 通路廠商服務
// ......
return resultMap;
}
}
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