关于spring:手写一个Spring-Boot-Starter

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嗨~ 大家好，我是阿壮，一个后端程序员，明天和大家分享 Spring Boot 的主动拆卸原理，并手写一个 Starter 加深对 Spring Boot 的了解。

家喻户晓，Spring Boot 为了简化开发，省去了 Spring 中很多的 XML 文件。为了了解 Spring Boot 中主动拆卸的原理，明天咱们基于这个机制本人入手实现一个 Starter 组件。

新建一个名为：redis-spring-boot-starter的 Maven 我的项目

增加 Maven 依赖

<dependencies>
     <dependency>
         <groupId>org.springframework.boot</groupId>
         <artifactId>spring-boot-starter</artifactId>
     </dependency>
     <dependency>
         <groupId>org.redisson</groupId>
         <artifactId>redisson</artifactId>
         <version>3.11.1</version>
     </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-dependencies</artifactId>
             <version>2.3.2.RELEASE</version>
             <type>pom</type>
             <scope>import</scope>
         </dependency>
     </dependencies>
 </dependencyManagement>

定义属性，实现在 applications.properties 中的 Redis 的连贯参数。

@ConfigurationProperties(prefix = "gp.redisson")
public class RedissonProperties {
 private String host = "localhost";
 private String password;
 private int port = 6379;
 private int timeout;
 private boolean ssl;

 public String getHost() {return host;}

 public void setHost(String host) {this.host = host;}

 public String getPassword() {return password;}

 public void setPassword(String password) {this.password = password;}

 public int getPort() {return port;}

 public void setPort(int port) {this.port = port;}

 public int getTimeout() {return timeout;}

 public void setTimeout(int timeout) {this.timeout = timeout;}

 public boolean isSsl() {return ssl;}

 public void setSsl(boolean ssl) {this.ssl = ssl;}
}

定义须要主动拆卸的配置类

@Configuration
@ConditionalOnClass(Redisson.class)
@EnableConfigurationProperties(RedissonProperties.class)
public class RedissonAutoConfiguration {
 @Bean
 RedissonClient redissonClient(RedissonProperties redissonProperties) {Config config = new Config();
     String prefix = "redis://";
     if (redissonProperties.isSsl()) {prefix = "rediss://";}
     SingleServerConfig singleServerConfig = config.useSingleServer()
             .setAddress(prefix + redissonProperties.getHost() + ":" + redissonProperties.getPort())
             .setConnectTimeout(redissonProperties.getTimeout());
     if (!StringUtils.hasText(redissonProperties.getPassword())) {singleServerConfig.setPassword(redissonProperties.getPassword());
     }
     return Redisson.create(config);
 }
}

在 resource 文件夹下新建 META-INF/spring.fatories 文件，使 Spring Boot 程序能够扫描文件实现主动拆卸
```
org.springframework.boot.autoconfigure.EnableAutoConfiguration=com.jonssonyan.config.RedissonAutoConfiguration
```
打包成 jar 包

在其余我的项目引入当先依赖

     <dependency>
         <groupId>com.jonssonyan</groupId>
         <artifactId>redis-spring-boot-starter</artifactId>
         <version>1.0-SNAPSHOT</version>
     </dependency>