Spring Boot系列-- 如何自定义Starter！
Spring Boot系列-- 如何自定义Starter！
创建一个maven项目，在pom文件中添加如下依赖：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.wisdom</groupId>
<artifactId>spring-boot-starter-hello</artifactId>
<version>1.0-REALEASE</version>
<packaging>jar</packaging>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-autoconfigure</artifactId>
<version>2.0.0.RELEASE</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>spring-boot-autoconfigure此jar包中包含大量核心注解，包含条件注解等。创建properties属性类，用于读取属性。
@ConfigurationProperties(prefix = "com.wisdom")
public class HelloServiceProperties {
private String name = "wisdom";
private String hobby = "basketball";
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getHobby() {
return hobby;
}
public void setHobby(String hobby) {
this.hobby = hobby;
}
}@ConfigurationProperties配置此注解可以自动导入application.properties配置文件中的属性，前提需要指定属性前缀prefix。如果application.properties文件中未指定相应属性，便使用默认的，如上
name=“wisdom”,hobby=“basketball”.创建配置类
public class HelloServiceConfiguration {
private String name;
private String hobby;
public String getName() {
return "name is " + name;
}
public String getHobby() {
return "hobby is " + hobby;
}
public void setName(String name) {
this.name = name;
}
public void setHobby(String hobby) {
this.hobby = hobby;
}
}创建自动配置类：
@Configuration
@EnableConfigurationProperties(HelloServiceProperties.class)
@ConditionalOnClass(HelloServiceConfiguration.class)
@ConditionalOnProperty(prefix = "com.wisdom", value = "enabled", matchIfMissing = true)
public class HelloServiceAutoConfiguration {
@Autowired
private HelloServiceProperties helloServiceProperties;
@Bean
@ConditionalOnMissingBean(HelloServiceConfiguration.class)
public HelloServiceConfiguration helloServiceConfiguration() {
HelloServiceConfiguration helloService = new HelloServiceConfiguration();
helloService.setName(helloServiceProperties.getName());
helloService.setHobby(helloServiceProperties.getHobby());
return helloService;
}
}@Configuration：表明此类是一个配置类，将变为一个bean被spring进行管理。@EnableConfigurationProperties：启用属性配置，将读取HelloServiceProperties里面的属性。@ConditionalOnClass：当类路径下面有HelloServiceConfiguration此类时，自动配置。@ConditionalOnProperty：判断指定的属性是否具备指定的值。@ConditionalOnMissingBean：当容器中没有指定bean是，创建此bean。在resources文件夹下面新建一个META-INF文件，并在下面创建spring.factories文件，将4中的配置类进行注册。
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
com.wisdom.HelloServiceAutoConfiguration至此，自定义的spring-boot-starter-hello编写完毕，当然springboot官方建议对于非官方的starter命名方式为xxx-spring-boot-starter。执行
mvn clean install将项目打成一个jar包。
新建一个springboot项目，在pom文件中添加刚刚打包的jar的坐标。
<dependency>
<groupId>com.wisdom</groupId>
<artifactId>spring-boot-starter-hello</artifactId>
<version>1.0-REALEASE</version>
</dependency>在启动类上编写访问接口
@SpringBootApplication
@RestController
public class Springboot03Application {
@Autowired
private HelloServiceConfiguration helloService;
public static void main(String[] args) {
SpringApplication.run(Springboot03Application.class, args);
}
@RequestMapping("/name")
public String getName() {
return helloService.getName();
}
@RequestMapping("/hobby")
public String getHobby() {
return helloService.getHobby();
}
}启动此springboot项目，依次访问 localhost:8080/name
localhost:8080/hobby
由于没有在application.properties中添加指定属性，所以会使用默认的属性。
接下来在application.properties添加我们自己的属性
com.wisdom.hobby=football
com.wisdom.name=messi重启springboot项目，继续访问
blog.csdn.net/qq_21150865/article/details/83504780