tjw8803
Tian戊辰
2018-08-10 07:53

求助:springboot中接口和实现类不在同一个jar中,@Autowired失败

10
  • spring
  • autowired

1.demo

1-1.接口定义

  包名:com.example.demo
        接口:ITest
package 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;

@Component
public 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;

@Component
public 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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