根据文档，Spring boot 将自动检查在任何用 @Configuration 注释的类中创建的 bean 类对象，并将覆盖该类的默认 bean，并返回具有定义时注入的任何属性的对象。但是当我在 junit 中测试此应用程序时，它不会返回正在注入的任何值。我所有的类都定义在同一个包中 我的代码如下，
引擎类
package com.test.simpletest;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
@Component
public class Engine {
private String msg;
public Engine() {
System.out.println("Engine class is being called");
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
}
测试配置类
package com.test.simpletest;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class TestConfiguration{
@Bean
public Engine engine() {
Engine eng = new Engine();
eng.setMsg("Message is being called");
return eng;
}
}
//Spring 启动主应用程序
package com.test.simpletest;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class SimpleTestExampleApplication {
public static void main(String[] args) {
SpringApplication.run(SimpleTestExampleApplication.class, args);
}
}
//JUnit Test class
package com.test.simpletest;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.context.ApplicationContext;
import
org.springframework.context.annotation.AnnotationConfigApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.test.context.junit4.SpringRunner;
@RunWith(SpringRunner.class)
@SpringBootTest
public class SimpleTestExampleApplicationTests {
@Autowired
private Engine engine;
@Test
public void contextLoads() {
engine.getMsg();
//Both above and below approach does not work
// ApplicationContext apx = new
AnnotationConfigApplicationContext(TestConfiguration.class);
// Engine engine = (Engine)apx.getBean(Engine.class);
// engine.getMsg();
}
}
请帮助我找到上述问题的解决方案。
演示应用程序
@SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
发动机
public class Engine {
private String msg;
public Engine() {
System.out.println("Engine class is being called");
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
}
测试配置
@Configuration
public class TestConfiguration {
@Bean
public Engine getEngine() {
Engine eng = new Engine();
eng.setMsg("Message is being called");
return eng;
}
}
演示应用测试
@RunWith(SpringRunner.class)
@SpringBootTest
@Import(TestConfiguration.class)
public class DemoApplicationTests {
@Autowired
private Engine engine;
@Test
public void contextLoads() {
System.out.println("engine : " + engine.getMsg());
}
}
输出
Engine class is being called
engine : Message is being called
您能否从引擎类中删除@Component，然后重试。我想它应该可以正常工作。