状态模式

Author: anxpp

src/com/anxpp/designpattern/state/ISaveData.java

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+packagecom.anxpp.designpattern.state;
+//抽象状态
+publicinterfaceISaveData{
+voidsave(Objectdata);
+}

src/com/anxpp/designpattern/state/SaveBigData.java

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+packagecom.anxpp.designpattern.state;
+//具体状态
+publicenumSaveBigDataimplementsISaveData{
+instance;
+@Override
+publicvoidsave(Objectdata){
+System.out.println("保存到文件:" + data);
+ }
+}

src/com/anxpp/designpattern/state/SaveDataController.java

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+packagecom.anxpp.designpattern.state;
+//环境（Context）
+publicclassSaveDataController{
+privateISaveDatasaveData;
+publicvoidsave(Stringdata){
+//为了演示，此处的大的数据其实也是很小的
+if(data.length()<1<<2)
+saveData = SaveSmallData.instance;
+elseif(data.length()<1<<4)
+saveData = SaveMiddleData.instance;
+else
+saveData = SaveBigData.instance;
+saveData.save(data);
+ }
+}

src/com/anxpp/designpattern/state/SaveMiddleData.java

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+packagecom.anxpp.designpattern.state;
+//具体状态
+publicenumSaveMiddleDataimplementsISaveData{
+instance;
+@Override
+publicvoidsave(Objectdata){
+System.out.println("保存到Mysql:" + data);
+ }
+}

src/com/anxpp/designpattern/state/SaveSmallData.java

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+packagecom.anxpp.designpattern.state;
+//具体状态
+publicenumSaveSmallDataimplementsISaveData{
+instance;
+@Override
+publicvoidsave(Objectdata){
+System.out.println("保存到Redis:" + data);
+ }
+}

src/com/anxpp/designpattern/state/TestUse.java

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+packagecom.anxpp.designpattern.state;
+publicclassTestUse{
+publicstaticvoidmain(Stringargs[]){
+StringsmallData = "小数据";
+StringmiddleData = "介于小数据和大数据之间的数据";
+StringbifgData = "这里就假定这是一个很大很大很大的数据";
+SaveDataControllersaveDataController = newSaveDataController();
+saveDataController.save(smallData);
+saveDataController.save(middleData);
+saveDataController.save(bifgData);
+ }
+}

src/com/anxpp/designpattern/state/package-info.java

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+/**
+ * @author Administrator
+ * 状态模式
+ */
+packagecom.anxpp.designpattern.state;