一个接口多个实现类
一、以静态变量保存Spring ApplicationContext, 可在任何代码任何地方任何时候取出ApplicaitonContext。适用于根据数据库的配置取出对应定时任务的实现类
package com.wy.SpringBean; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.DisposableBean; import org.springframework.context.ApplicationContext; import org.springframework.context.ApplicationContextAware; import org.springframework.stereotype.Component; import org.springframework.util.Assert; /** * @description:以静态变量保存Spring ApplicationContext, 可在任何代码任何地方任何时候取出ApplicaitonContext, * 适用于根据数据库的配置取出对应定时任务的实现类 **/ @Component public class SpringContextHolder implements ApplicationContextAware, DisposableBean { private static ApplicationContext applicationContext = null; private static Logger logger = LoggerFactory.getLogger(SpringContextHolder.class); /** * 取得存储在静态变量中的ApplicationContext. */ public static ApplicationContext getApplicationContext() { assertContextInjected(); return applicationContext; } /** * 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型. */ @SuppressWarnings("unchecked") public static <T> T getBean(String name) { assertContextInjected(); return (T) applicationContext.getBean(name); } /** * 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型. */ public static <T> T getBean(Class<T> requiredType) { assertContextInjected(); return applicationContext.getBean(requiredType); } /** * 清除SpringContextHolder中的ApplicationContext为Null. */ public static void clearHolder() { logger.debug("清除SpringContextHolder中的ApplicationContext:" + applicationContext); applicationContext = null; } /** * 实现ApplicationContextAware接口, 注入Context到静态变量中. */ @Override public void setApplicationContext(ApplicationContext applicationContext) { logger.debug("注入ApplicationContext到SpringContextHolder:" + applicationContext); if (SpringContextHolder.applicationContext != null) { logger.warn("SpringContextHolder中的ApplicationContext被覆盖, 原有ApplicationContext为:" + SpringContextHolder.applicationContext); } SpringContextHolder.applicationContext = applicationContext; } /** * 实现DisposableBean接口, 在Context关闭时清理静态变量. */ @Override public void destroy() throws Exception { SpringContextHolder.clearHolder(); } /** * 检查ApplicationContext不为空. */ private static void assertContextInjected() { Assert.state(applicationContext != null, "applicaitonContext属性未注入, 请在applicationContext.xml中定义SpringContextHolder."); } }
二、定义接口
public interface TestInterface { void testInter(String str); }
三、定义两个个实现类
@Service("testImp01") public class testImp01 implements TestInterface{ @Override public void testInter(String str) { System.out.println("testImp01:"+str); } }
@Service("testImp02") public class testImp02 implements TestInterface{ @Override public void testInter(String str) { System.out.println("testImp02:"+str); } }
四、定义controller
@RestController public class TestController { @RequestMapping("test01") public void test01() { TestInterface testInterface = SpringContextHolder.getBean("testImp01"); testInterface.testInter("01"); } @RequestMapping("test02") public void test02() { TestInterface testInterface = SpringContextHolder.getBean("testImp02"); testInterface.testInter("02"); } }
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