标签:pid lease 维护 map 特殊 开始 scan vat 需要
使用spring boot开发微服务后,工程的数量大大增加(一定要按照领域来切,不要一个中间件客户端包一个),让各个jar从开发和运行时自包含成了一个重要的内容之一。spring boot starter就可以用来解决该问题(没事启动时别依赖于applicationContext.getBean获取bean进行处理,依赖关系太折腾,有时候在复杂系统中解决此事比较麻烦,需要修改开源框架代码才能实现,反过来修改开源源码后,维护也是个麻烦事)。言归正传,说说自定义starter。首先请熟悉spring boot的核心理念,不然容易为了starter而starter,这种情况太多了。
<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>
@ConfigurationProperties(prefix = "com.xxx") public class HelloServiceProperties { private String name = "james"; private String hobby = "cc"; 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。
3.创建配置类
public class HelloService { 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; } }
@Configuration @EnableConfigurationProperties(HelloServiceProperties.class) @ConditionalOnClass(HelloServiceConfiguration.class) @ConditionalOnProperty(prefix = "com.xxx", value = "enabled", matchIfMissing = true)
@ComponentScan({"com.xxx"}) // 如果bean比较多,一般采用这种方式 public class HelloServiceAutoConfiguration { @Autowired private HelloServiceProperties helloServiceProperties; @Bean // bean比较少、且顺序和逻辑有特殊要求的模块,一般采用这种方式 @ConditionalOnMissingBean(HelloServiceConfiguration.class) public HelloServiceConfiguration helloServiceConfiguration() { HelloService helloService = new HelloService(); helloService.setName(helloServiceProperties.getName()); helloService.setHobby(helloServiceProperties.getHobby()); return helloService; } }
org.springframework.boot.autoconfigure.EnableAutoConfiguration=com.xxx.HelloServiceAutoConfiguration
@SpringBootApplication @RestController public class Springboot03Application { @Autowired private HelloService 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(); } }
相比原来要使用@Import注解导入一个@Configuration类,或者在一处集中维护ComponentScan的所有路径,使用autoconfigure starter可以让应用明显实现的更加自包含和解耦。
标签:pid lease 维护 map 特殊 开始 scan vat 需要
原文地址:https://www.cnblogs.com/zhjh256/p/12045636.html