SpringBoot实现自定义启动器的示例详解
不会压弯的小飞侠 人气:0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
<parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.2.2.RELEASE</version> </parent> <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding> <java.version>1.8</java.version> </properties> <dependencies> <!--引入spring‐boot‐starter;所有starter的基本配置--> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter</artifactId> </dependency> <!--自动配置连接池--> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid</artifactId> <version>1.1.12</version> </dependency> <dependency> <groupId>c3p0</groupId> <artifactId>c3p0</artifactId> <version>0.9.1.2</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-configuration-processor</artifactId> <optional>true</optional> </dependency> </dependencies>
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
<!--依赖自定义启动器--> <dependency> <groupId>com.study</groupId> <artifactId>SpringBoot_datasource</artifactId> <version>1.0-SNAPSHOT</version> </dependency>
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
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