关于简单工厂应用的心得

qyhdt

简单工厂模式大家并不陌生了，但是实际应用还是比较少的，基本都是实现好的框架内部包含了简单工厂模式，去年在写一个监控平台时候用到了一个实例化系统对象的一个简单工厂，结合面向接口编程这样可以处理不同系统的不同命令，监控平台移植到任何一个系统都不用改代码直接选择相应接口，不多说了具体代码实现如下，只是一点个人心得，需要学习的人可以看看，很牛X的鼻祖就免啦。首先是一个系统接口package com.rose.common.frame.factory;/** * <p>Title: 运营监控插件 系统模块</p> * <p>Description: 系统信息</p> * <p>Copyright: Copyright (c) 2009</p> * @author qiuy * @version 1.0 */public interface SystemService {/** * <p>重启操作系统</p> */void restartSystem();/** * <p>关闭操作系统</p> */void shutdownSystem();/** * <p>重启应用系统</p> */void restartApplicationSystem();/** * <p>关闭应用系统</p> */void shutdownApplicationSystem();/** * <p>取消命令</p> */void rollbackCommand();/** * <p>输出最后100行日志</p> * @return StringBuffer 日志字符串 */public StringBuffer getLastIndex100Log(int index,String date);}
接下来是一个window系统的接口实现类
package com.rose.common.frame.factory;public class WindowsSystemServiceImpl implements SystemService {public void restartSystem() {}public void shutdownSystem() {}public void restartApplicationSystem() {}public void shutdownApplicationSystem() {}public void rollbackCommand() {}public StringBuffer getLastIndex100Log(int index,String date) {return null;}public static void main(String[] args) {}}
下面是linux系统的接口实现类
package com.rose.common.frame.factory;public class LinuxSystemServiceImpl implements SystemService {public void restartSystem() {}public void shutdownSystem() {}public void rollbackCommand() {}public void restartApplicationSystem() {}public void shutdownApplicationSystem() {}public StringBuffer getLastIndex100Log(int index,String date) {return null;}}
下面就是一个简单工厂获得系统实例package com.rose.common.frame.factory;import java.io.IOException;/** * @author qiuy */public class SystemInstanceFactory {private static SystemService systemService;public static SystemService getSystemService() {return systemService;}public static void setSystemService(SystemService systemService) {SystemInstanceFactory.systemService = systemService;}/** * <p>获取系统实例</p> * @return * @throws IOException */public static SystemService getSystemInstance() throws IOException{String strOSName = System.getProperty("os.name");if (systemService == null) {if(strOSName.toLowerCase().startsWith("windows")) {systemService = new WindowsSystemServiceImpl(); //创建windows系统实例}else if(strOSName.toLowerCase().startsWith("linux")) {systemService = new LinuxSystemServiceImpl();//创建linux系统实例}else {throw new IOException("unknown operating system: " + strOSName);}}        return systemService;}}
ok以上代码就是一个典型的简单工厂应用，个人认为这样写很实用，测试代码如下。package com.rose.common.frame.factory;import java.io.IOException;public class TestFactory {public static void main(String[] args) {SystemService systemService = null;try {systemService = SystemInstanceFactory.getSystemInstance();} catch (IOException e) {e.printStackTrace();}systemService.shutdownSystem();//关闭操作系统，不同操作系统调用不同命令。}}