Spring Boot 自定义 Starter

Spring Boot Starter 启动器自动装载 bean 。

把一个完整的项目（框架）自动组装到我们的项目中

1、自定义一个要装载的项目

2、创建属性读取类 ServiceProperties

package com.southwind.properties;

import lombok.Data;
import org.springframework.boot.context.properties.ConfigurationProperties;

@Data
@ConfigurationProperties(prefix = "southwind.service")
public class ServiceProperties {
    private String prefix;
    private String suffix;
}

3、创建 Service

package com.southwind.service;

public class Service {
    private String prefix;
    private String suffix;

    public Service(String prefix, String suffix) {
        this.prefix = prefix;
        this.suffix = suffix;
    }

    public String doService(String value){
        return this.prefix + value + this.prefix;
    }

}

4、创建自动配置类 AutoConfigration

package com.southwind.configuration;

import com.southwind.properties.ServiceProperties;
import com.southwind.service.Service;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

@Configuration
@ConditionalOnClass(Service.class)
@EnableConfigurationProperties(ServiceProperties.class)
public class AutoConfiguration {

    @Autowired
    private ServiceProperties serviceProperties;

    @Bean
    @ConditionalOnMissingBean
    @ConditionalOnProperty(
            prefix = "southwind.service",
            value = "enable",
            havingValue = "true"
    )
    public Service service(){
        return new Service(serviceProperties.getPrefix(),
                serviceProperties.getSuffix());
    }

}

5、创建 spring 工程文件

org.springframework.boot.autoconfigure.EnableAutoConfiguration=com.southwind.configuration.AutoConfiguration

6、将项目打成 jar 包

7、jar 打包到本地仓库

mvn install:install-file -DgroupId=com.southwind -DartifactId=mystarter002 -Dversion=1.0.0 -Dpackaging=jar -Dfile=D:\WorkSpace\IdeaProjects\mystarter002\out\artifacts\mystarter002_jar\mystarter002.jar

8、配置application.yml

southwind:
  service:
    prefix: 123
    suffix: abc
    enable: true