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1.demo1-1.接口定义 包名：com.example.demo 接口：ITestpackage com.example.demo;public interface ITest { void find();}1.2.接口使用@Autowired@Qualifier("myTest2") // ←自动注入不同的实现类private ITest itest;// 调用实现类的方法itest.find();1.3.同一jar中定义实现类package com.example.demo;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.stereotype.Component;@Componentpublic class MyTest2 implements ITest { private static final Logger LOGGER = LoggerFactory.getLogger(MyTest2.class); @Override public void find() { LOGGER.info("MyTest2#find"); }}2.demo01 在其他jar中定义实现类【**包名相同**】 package com.example.demo;import org.slf4j.Logger;import org.slf4j.LoggerFactory;import org.springframework.stereotype.Component;@Componentpublic class MyTest implements ITest { private static final Logger LOGGER = LoggerFactory.getLogger(MyTest.class); @Override public void find() { LOGGER.info("MyTest#find"); }}注）Springboot入口类： @SpringBootApplication(scanBasePackages = { "com.example" })public class DemoApplication { public static void main(String[] args) { SpringApplication.run(DemoApplication.class, args); }}然后修改上面【1.2.接口使用】中@Qualifier的实现类，运行后发现：
1.@Qualifier("myTest") -------> 运行失败，错误如下：
APPLICATION FAILED TO START
Description: Field itest in com.example.demo.MyRunner required a bean of type 'com.example.demo.ITest' that could not be found. Action: Consider defining a bean of type 'com.example.demo.ITest' in your configuration.
2.@Qualifier("myTest2") -------> 运行成功
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