SpringBoot实现自定义启动器的示例详解

虽然Spring官方给我们提供了很多的启动器供我们使用，但有时候我们也会遇到某些特殊场景，这些启动器满足不了。这个时候就需要自定义一个启动器供我们使用，本文为大家介绍了SpringBoot实现自定义启动器的方法，希望对大家有所帮助

开发步骤

1.创建启动器项目

添加启动器相关依赖
创建属性配置类
创建自动配置类
编写自动配置文件(spring.factories)
使用自定义的启动器

测试

创建个SpringBoot项目，导入依赖

 org.springframework.bootspring-boot-starter-parent2.2.2.RELEASE UTF-8UTF-81.8  org.springframework.bootspring-boot-starter com.alibabadruid1.1.12 c3p0c3p00.9.1.2 org.springframework.bootspring-boot-configuration-processortrue

创建属性配置类

@Component @ConfigurationProperties(prefix = "spring.jdbc.datasource") public class DataSourceProperties { private String driverClassName ; private String url; private String username; private String password; public String getDriverClassName() { return driverClassName; } public void setDriverClassName(String driverClassName) { this.driverClassName = driverClassName; } public String getUrl() { return url; } public void setUrl(String url) { this.url = url; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } @Override public String toString() { return "DataSourceProperties{" + "driverClassName='" + driverClassName + '\'' + ", url='" + url + '\'' + ", username='" + username + '\'' + ", password='" + password + '\'' + '}'; } }

创建自动配置类

@SpringBootConfiguration  //当前类是个配置类 @EnableConfigurationProperties(DataSourceProperties.class) public class DataSourceAutoConfiguration { @Autowired private DataSourceProperties dataSourceProperties; @Bean public DataSource createDataSource(){ DruidDataSource dataSource = new DruidDataSource(); dataSource.setDriverClassName(dataSourceProperties.getDriverClassName()); dataSource.setUrl(dataSourceProperties.getUrl()); dataSource.setUsername(dataSourceProperties.getUsername()); dataSource.setPassword(dataSourceProperties.getPassword()); return dataSource; } }

编写自动配置属性文件

在 resource 文件夹下面新建 META-INF/spring.factories

org.springframework.boot.autoconfigure.EnableAutoConfiguration=com.study.config.DataSourceAutoConfiguration

执行install , 安装项目

自定义启动器

重新创建个项目，引用SpringBoot_datasource的依赖

 com.studySpringBoot_datasource1.0-SNAPSHOT

配置连接池信息

server.port=8081 spring.jdbc.datasource.driverClassName=com.mysql.jdbc.Driver spring.jdbc.datasource.url=jdbc:mysql:///springboot_datasource spring.jdbc.datasource.username=root spring.jdbc.datasource.password=root spring.profiles.active=datasource

编写Controller类

@RestController public class HelloAutoController { @Autowired private DataSource dataSource; @RequestMapping("/dataSource") public String dataSource() { System.out.println(dataSource.getClass());//打印DruidDataSource数据源 return "Hello dataSource! ! ! " ; } }

使用自定义启动类进行测试

启动器支持多Druid和C3P0

添加创建druid和c3p0方法

@SpringBootConfiguration  //当前类是个配置类 @EnableConfigurationProperties(DataSourceProperties.class) public class DataSourceAutoConfiguration { @Autowired private DataSourceProperties dataSourceProperties; @Bean @ConditionalOnProperty(value = "spring.jdbc.datasource.type",havingValue = "druid") public DataSource createDataSource(){ DruidDataSource dataSource = new DruidDataSource(); dataSource.setDriverClassName(dataSourceProperties.getDriverClassName()); dataSource.setUrl(dataSourceProperties.getUrl()); dataSource.setUsername(dataSourceProperties.getUsername()); dataSource.setPassword(dataSourceProperties.getPassword()); return dataSource; } @Bean @ConditionalOnProperty(value = "spring.jdbc.datasource.type",havingValue = "c3p0") public DataSource createC3P0DataSource() throws Exception { ComboPooledDataSource dataSource = new ComboPooledDataSource(); dataSource.setDriverClass(dataSourceProperties.getDriverClassName()); dataSource.setJdbcUrl(dataSourceProperties.getUrl()); dataSource.setUser(dataSourceProperties.getUsername()); dataSource.setPassword(dataSourceProperties.getPassword()); return dataSource; } }

配置文件中配置了spring.jdbc.datasource.type=druid使用druid数据源

server.port=8081 spring.jdbc.datasource.driverClassName=com.mysql.jdbc.Driver spring.jdbc.datasource.url=jdbc:mysql:///springboot_datasource spring.jdbc.datasource.username=root spring.jdbc.datasource.password=root spring.jdbc.datasource.type=druid

重新安装，再次测试

配置了spring.jdbc.datasource.type=c3p0使用c3p0数据源

server.port=8081 spring.jdbc.datasource.driverClassName=com.mysql.jdbc.Driver spring.jdbc.datasource.url=jdbc:mysql:///springboot_datasource spring.jdbc.datasource.username=root spring.jdbc.datasource.password=root spring.jdbc.datasource.type=c3p0

重新安装，再次测试