• 08_springboot2.x自定义starter


    概述

    starter:启动器
    1、这个场景需要使用到的依赖是什么?
    2、如何编写自动配置

    规则:

    @Configuration //指定这个类是一个配置类
    @ConditionalOnXXX //在指定条件成立的情况下自动配置类生效
    @AutoConfigureAfter //指定自动配置类的顺序
    @Bean //给容器中添加组件
    @ConfigurationPropertie结合相关xxxProperties类来绑定相关的配置
    @EnableConfigurationProperties //让xxxProperties生效加入到容器中

    自动配置类要能加载
    将需要启动就加载的自动配置类,配置在META‐INF/spring.factories

    org.springframework.boot.autoconfigure.EnableAutoConfiguration=
    org.springframework.boot.autoconfigure.admin.SpringApplicationAdminJmxAutoConfiguration,
    org.springframework.boot.autoconfigure.aop.AopAutoConfiguration,

    模式
    启动器只用来做依赖导入;
    专门来写一个自动配置模块;
    启动器依赖自动配置;别人只需要引入启动器(starter)
    mybatis-spring-boot-starter;自定义启动器名-spring-boot-starter

    启动器(starter)
    –启动器模块是一个空JAR 文件,仅提供辅助性依赖管理,这些依赖可能用于自动装配或者其他类库

    命名规约:
    •推荐使用以下命名规约

    官方命名空间
    –前缀:“spring-boot-starter-”
    –模式:spring-boot-starter-模块名
    –举例:spring-boot-starter-web、spring-boot-starter-actuator、spring-boot-starter-jdbc

    自定义命名空间
    –后缀:“-spring-boot-starter”
    –模式:模块-spring-boot-starter
    –举例:mybatis-spring-boot-starter

    图解

    1、编写启动器XXX-starter

    2、自动配置模块

    pom.xml

    <?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.1.9.RELEASE</version>
            <relativePath/> <!-- lookup parent from repository -->
        </parent>
        <groupId>com.spboot</groupId>
        <artifactId>jatpeo-spring-boot-starter-autoconfigurer</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>jatpeo-spring-boot-starter-autoconfigurer</name>
        <description>Demo project for Spring Boot</description>
    
        <properties>
            <java.version>1.8</java.version>
        </properties>
    
        <dependencies>
            <!--所有starter的基本配置-->
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter</artifactId>
            </dependency>
        </dependencies>
    
    
    </project>
    

    应用举例:

    HelloProperties 配置文件
    package com.spboot.starter;
    
    import org.springframework.boot.context.properties.ConfigurationProperties;
    
    @ConfigurationProperties(prefix = "jatpeo.hello")
    public class HelloProperties {
    
        private String prefix;
        private String suffix;
    
        public String getPrefix() {
            return prefix;
        }
    
        public void setPrefix(String prefix) {
            this.prefix = prefix;
        }
    
        public String getSuffix() {
            return suffix;
        }
    
        public void setSuffix(String suffix) {
            this.suffix = suffix;
        }
    }
    
    HelloService
    package com.spboot.starter;
    
    public class HelloService {
    
        HelloProperties helloProperties;
    
    
        public String sayHello(String name){
    
        return helloProperties.getPrefix()+ name + helloProperties.getSuffix();
        }
    
        public HelloProperties getHelloProperties() {
            return helloProperties;
        }
    
        public void setHelloProperties(HelloProperties helloProperties) {
            this.helloProperties = helloProperties;
        }
    }
    

    自动配置类:

    HelloServiceAutoConfiguration
    package com.spboot.starter;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
    import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
    import org.springframework.boot.context.properties.EnableConfigurationProperties;
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    
    @Configuration
    @ConditionalOnWebApplication//web应用起效果
    @EnableConfigurationProperties(HelloProperties.class)
    public class HelloServiceAutoConfiguration {
    
        @Autowired
        HelloProperties helloProperties;
    
        @Bean
        public HelloService helloService(){
            HelloService helloService = new HelloService();
            helloService.setHelloProperties(helloProperties);
            return helloService;
        }
    }
    

    注意:这里让自动配置类生效得在META-INF/新建spring.factories

    org.springframework.boot.autoconfigure.EnableAutoConfiguration=
    com.spboot.starter.HelloServiceAutoConfiguration

    分别安装到maven仓库

    注意安装顺序

    测试:

    新建项目

    pom.xml

    注意:引用的是我们配置的启动器的

    application.properties

    controller:

    package com.spboot.springboot.controller;
    
    import com.spboot.starter.HelloService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class helloController {
    
        @Autowired
        HelloService helloService;
    
        @GetMapping("/hello")
        public String say(){
            return helloService.sayHello("dyn");
        }
    
    }
    

    浏览器测试:

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  • 原文地址:https://www.cnblogs.com/jatpeo/p/11767489.html
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