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SpringBoot自定义启动器
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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