SprngBoot之所以现在这吗火热，是因为spring starter模式使我们日常模块化开发独立化, 模块之间依赖关系更加松散，更加的方便集成
如何实现
首先建立一个普通maven工程，修改pom配置文件
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-autoconfigure</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-configuration-processor</artifactId>
<optional>true</optional>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.6.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
然后定义一个配置文件属性的类，为后续再其它项目中配置属性时使用。以spring.test-starter为开头，后面配置时间添加相应的属性即可
@ConfigurationProperties(prefix = "spring.test-starter")
public class TestProperties {
private String name;
private int age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
t添加一个测试的service。其它模块集成这个starter时可以直接调用
public class TestService {
private TestProperties properties;
public TestService() {
}
public TestService(TestProperties properties) {
this.properties = properties;
}
public String sayHello(){
return "自定义starter->读取配置文件,name="+properties.getName()+"age="+properties.getAge();
}
}
创建自动配置。用于读取自定义的配置属性和自动注入TestService的 bean。每个starter都至少会有一个自动配置类
@Configuration
@EnableConfigurationProperties(TestProperties.class)
@ConditionalOnClass(TestService.class)
@ConditionalOnProperty(prefix = "spring.test-starter", value = "enabled", matchIfMissing = true)
public class TestServiceAutoConfiguration {
@Autowired
private TestProperties properties;
/**
*
* 容器中没有指定Bean时会自动配置PestService
* @return
*/
@Bean
@ConditionalOnMissingBean(TestService.class)
public TestService testService(){
TestService testService = new TestService(properties);
return testService;
}
在resources目录下创建META-INF文件夹并添加spring.factories文件。在该文件中配置自己的自动配置类。如果去debug springboot源码会发现SpringApplication.run中就执行了读取spring.factories文件的操作去进行自动配置
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
com.example.TestServiceAutoConfiguration
这样自定义一个starter 就完成了。接下来就可以到其它模块中使用了。首先在其他模块中引入
<dependency>
<groupId>com.example</groupId>
<artifactId>test-springboot-starter</artifactId>
<version>1.0</version>
</dependency>
application.properties中添加配置属性
spring.test-starter.name=qxwxww
spring.test-starter.age=25
测试
@RunWith(SpringRunner.class)
@SpringBootTest
public class TestSpringbootApplicationTests {
@Autowired
TestService testService;
@Test
public void contextLoads() {
System.err.println(testService.sayHello());
}
}
输出如下提示，表示成功
image
