无设计模式

publicclassOrderHandle {/**   * 无设计模式   */publicvoidgenerateOrder(StringorderType) {if ("ordinary".equals(orderType)) {System.out.println("生成普通订单");    }elseif ("group".equals(orderType)) {System.out.println("生成团购订单");    }elseif ("promotion".equals(orderType)) {System.out.println("暂不支持促销订单");    }  }}// 使用StringorderType ="group";OrderHandleorderHandle =newOrderHandle();orderHandle.generateOrder(orderType);

静态工厂策略模式

publicclassStaticStrategyFactory {staticMap<String,AbstractOrderHandle>strategyMap =newHashMap<>();publicstaticAbstractOrderHandlegetStrategy(Stringtype) {returnstrategyMap.get(type);  }publicstaticvoidregister(Stringtype,AbstractOrderHandlehandle) {strategyMap.put(type,handle);  }}

publicabstractclassAbstractOrderHandleimplementsInitializingBean {publicvoidgenerateOrder() {thrownewUnsupportedOperationException("暂不支持生成该类型订单");  }}

@ComponentpublicclassGroupOrderHandleextendsAbstractOrderHandle {publicvoidgenerateOrder() {System.out.println("生成团购订单");  }@OverridepublicvoidafterPropertiesSet()throwsException {StaticStrategyFactory.register(OrderEnum.GROUP.getCode(),this);  }}

@TestvoidtestOrdinaryOrder() {StaticStrategyFactory.getStrategy(OrderEnum.ORDINARY.getCode()).generateOrder();}

自动装配工厂策略模式

@ComponentpublicclassAutoInjectStrategyFactory {@ResourcepublicList<AbstractPlatformStrategy>platformStrategyList;privatefinalMap<String,AbstractPlatformStrategy>strategyMap =newHashMap<>();@PostConstructpublicvoidregistered() {platformStrategyList.forEach(strategy ->strategyMap.put(strategy.getPlatform(),strategy));  }publicAbstractPlatformStrategygetStrategy(Stringplatform) {returnstrategyMap.get(platform);  }}

publicabstractclassAbstractPlatformStrategyimplementsIPlatform {publicvoidhandlePlatform() {thrownewUnsupportedOperationException("暂不支持处理该平台");  }}publicinterfaceIPlatform {StringgetPlatform();}

@ServicepublicclassJDPlatformStrategyextendsAbstractPlatformStrategy {@OverridepublicvoidhandlePlatform() {System.out.println("处理京东平台");  }@OverridepublicStringgetPlatform() {returnPlatformEnum.JD.getPlatform();  }}

@TestvoidtestJDPlatform() {autoInjectStrategyFactory.getStrategy(PlatformEnum.JD.getPlatform()).handlePlatform();}

枚举工厂策略模式

publicenumWorkOrderEnumFactory {CONSTRUCTION("construction","施工工单",ConstructionStrategy.class),MAINTENANCE("maintenance","维修工单",MaintenanceStrategy.class);privateStringcode;privateStringdesc;privateClass<?>strategyClass;WorkOrderEnumFactory(Stringcode,Stringdesc,Class<?>strategyClass) {this.code =code;this.desc =desc;this.strategyClass =strategyClass;  }publicStringgetCode() {returncode;  }publicStringgetDesc() {returndesc;  }publicClass<?>getStrategyClass() {returnstrategyClass;  }publicstaticIWorkOrderStrategygetStrategy(Stringcode) {for (WorkOrderEnumFactoryworkOrderEnumFactory :WorkOrderEnumFactory.values()) {if (Objects.equals(workOrderEnumFactory.getCode(),code)) {return (IWorkOrderStrategy)SpringContextUtils.getBean(workOrderEnumFactory.getStrategyClass());      }    }thrownewRuntimeException();  }}

@ServicepublicclassConstructionStrategyimplementsIWorkOrderStrategy {publicvoidgenerateWorkOrder() {System.out.println("生成施工工单");  }}

@TestvoidtestConstructionWorkOrder() {WorkOrderEnumFactory.getStrategy(WorkOrderEnumFactory.CONSTRUCTION.getCode()).generateWorkOrder();}