创建一个新的maven项目
新建Properties类(相当于调用的项目传入start的参数)
其中需要@ConfigurationProperties注解
prefix = "login" 的意思是调用的spring boot项目 application.properties中配置的参数
调用时传入的为
1. login.className = com.mysql.jdbc.Driver 2. login.url=jdbc:mysql://localhost:3306/humanresource?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC 3. login.user=root 4. login.password=root
1. @ConfigurationProperties(prefix = "login") 2. public class LoginCheckProperties { 3. 4. private String className; 5. private String url; 6. private String user; 7. private String password; 8. 9. public String getClassName() { 10. return className; 11. } 12. 13. public void setClassName(String className) { 14. this.className = className; 15. } 16. 17. public String getUrl() { 18. return url; 19. } 20. 21. public void setUrl(String url) { 22. this.url = url; 23. } 24. 25. public String getUser() { 26. return user; 27. } 28. 29. public void setUser(String user) { 30. this.user = user; 31. } 32. 33. public String getPassword() { 34. return password; 35. } 36. 37. public void setPassword(String password) { 38. this.password = password; 39. } 40. }
Config类
其中@EnableConfigurationProperties(LoginCheckProperties.class) 注解为固定写法 意义是实现自动配置 ，类为上文中的Properties类
1. @Configuration 2. @EnableConfigurationProperties(LoginCheckProperties.class) 3. @MapperScan(basePackages = MasterDataSourceConfig.PACKAGE, sqlSessionFactoryRef = "masterSqlSessionFactory") 4. public class MasterDataSourceConfig { 5. 6. // 精确到 master 目录，以便跟其他数据源隔离 7. static final String PACKAGE = "com.airboot.bootdemo.dao.master"; 8. static final String MAPPER_LOCATION = "classpath*:mapper/master/*.xml"; 9. 10. private String className; 11. private String url; 12. private String user; 13. private String password; 14. 15. public MasterDataSourceConfig(LoginCheckProperties loginCheckProperties) { 16. this.className = loginCheckProperties.getClassName(); 17. this.url = loginCheckProperties.getUrl(); 18. this.user = loginCheckProperties.getUser(); 19. this.password = loginCheckProperties.getPassword(); 20. } 21. 22. @Bean(name = "masterDataSource") 23. public DataSource masterDataSource() { 24. DruidDataSource dataSource = new DruidDataSource(); 25. dataSource.setDriverClassName(className); 26. dataSource.setUrl(url); 27. dataSource.setUsername(user); 28. dataSource.setPassword(password); 29. //dataSource.setDriverClassName("com.mysql.jdbc.Driver"); 30. //dataSource.setUrl("jdbc:mysql://localhost:3306/humanresource?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC"); 31. //dataSource.setUsername("root"); 32. //dataSource.setPassword("root"); 33. return dataSource; 34. } 35. 36. @Bean(name = "masterTransactionManager") 37. 38. public DataSourceTransactionManager masterTransactionManager() { 39. return new DataSourceTransactionManager(masterDataSource()); 40. } 41. 42. @Bean(name = "masterSqlSessionFactory") 43. public SqlSessionFactory masterSqlSessionFactory(@Qualifier("masterDataSource") DataSource masterDataSource) 44. throws Exception { 45. final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean(); 46. sessionFactory.setDataSource(masterDataSource); 47. sessionFactory.setMapperLocations( 48. new PathMatchingResourcePatternResolver().getResources(MasterDataSourceConfig.MAPPER_LOCATION)); 49. return sessionFactory.getObject(); 50. } 51. 52. 53. }
META-INF/spring.factories
最后在resources中新建文件夹META-INF，在其中建立文件spring.factories.路径为上文Config中的路径
org.springframework.boot.autoconfigure.EnableAutoConfiguration=logincheckspringbootstarter.config.ds.MasterDataSourceConfig
如果要暴露多个使用以下代码
1. org.springframework.boot.autoconfigure.EnableAutoConfiguration=\ 2. com.*.*.*.*Util,\ 3. com.*.*.*.*Util,\ 4. com.*.*.*.*Util,\ 5. com.*.*.*.*Util,\ 6. com.*.*.*.*Util
如果想要在jar中加入注释 则需要在pom文件中修改以下代码 这样会生成一个 *.jar 和一个*:source.jar 需要将这两个jar包都加入项目中。
1. <build> 2. <plugins> 3. <plugin> 4. <groupId>org.apache.maven.plugins</groupId> 5. <artifactId>maven-source-plugin</artifactId> 6. <version>2.4</version> 7. <configuration> 8. <aggregate>true</aggregate> 9. </configuration> 10. <executions> 11. <execution> 12. <id>attach-javadocs</id> 13. <goals> 14. <goal>jar</goal> 15. </goals> 16. <configuration> 17. <additionalparam>-Xdoclint:none</additionalparam> 18. </configuration> 19. </execution> 20. </executions> 21. </plugin> 22. </plugins> 23. </build>
打包
使用命令mvn install
引入jar包
其中groupId 公司名称 我这里是cn.baocl
artifactId为项目名
这些在start项目的pom文件中配置
上一下pom文件
1. <?xml version="1.0" encoding="UTF-8"?> 2. <project xmlns="http://maven.apache.org/POM/4.0.0" 3. xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 4. xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> 5. <modelVersion>4.0.0</modelVersion> 6. 7. <groupId>cn.baocl</groupId> 8. <artifactId>check-spring-boot-starter</artifactId> 9. <version>1.1-SNAPSHOT</version> 10. 11. <dependencies> 12. <dependency> 13. <groupId>org.springframework.boot</groupId> 14. <artifactId>spring-boot-starter-web</artifactId> 15. <version>2.2.1.RELEASE</version> 16. </dependency> 17. 18. <dependency> 19. <groupId>org.mybatis.spring.boot</groupId> 20. <artifactId>mybatis-spring-boot-starter</artifactId> 21. <version>1.3.2</version> 22. </dependency> 23. <!-- Druid 数据连接池依赖 --> 24. <dependency> 25. <groupId>com.alibaba</groupId> 26. <artifactId>druid</artifactId> 27. <version>1.1.17</version> 28. </dependency> 29. 30. <dependency> 31. <groupId>org.springframework.boot</groupId> 32. <artifactId>spring-boot-devtools</artifactId> 33. <scope>runtime</scope> 34. <version>2.2.1.RELEASE</version> 35. </dependency> 36. 37. <dependency> 38. <groupId>mysql</groupId> 39. <artifactId>mysql-connector-java</artifactId> 40. <scope>runtime</scope> 41. <version>8.0.16</version> 42. </dependency> 43. 44. <dependency> 45. <groupId>org.springframework.boot</groupId> 46. <artifactId>spring-boot-configuration-processor</artifactId> 47. <optional>true</optional> 48. <version>2.2.1.RELEASE</version> 49. </dependency> 50. </dependencies> 51. 52. </project>
1. <dependency> 2. <groupId>cn.baocl</groupId> 3. <artifactId>check-spring-boot-starter</artifactId> 4. <version>1.1-SNAPSHOT</version> 5. </dependency>
使用
然后就可以使用了 本文实现的为主项目定义一个从数据源。所以在主项目中
com.airboot.bootdemo.dao.master，classpath*:mapper/master/*.xml
这两个路径文件使用的就是start中的配置的数据源
阿里多数据源配置的博客请参考:
项目结构
