声明：本文转载自https://my.oschina.net/u/2245781/blog/1559046，转载目的在于传递更多信息，仅供学习交流之用。如有侵权行为，请联系我，我会及时删除。
一、项目目录结构
二、新建MVN项目
创建过程需要填写groupId和artifactId，这里都是springboottest。
三、pom.xml把依赖的库都填进去。内容如下：
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>springboottest</groupId> <artifactId>springboottest</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>springboot-mybatis</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.8.RELEASE</version> <relativePath /> <!-- lookup parent from repository --> </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> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>1.3.0</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
四、创建数据库表user及配置：
见Spring Mybatis实例SqlSessionDaoSupport混用xml配置和注解。为了演示多数据源，分别在yiibai和test2中建user表，插入的数据内容不一样（随便写、只要两个不也一样就行）。
-- Database: `yiibai` INSERT INTO `user` (`id`, `name`, `dept`, `website`, `phone`, `birthday`) VALUES (1, 'yiibai1', 'Tech', 'http://www.yiibai.com', '13800009911', '1973-11-05'), (2, '依依2', 'Tech', 'http://www.zjptcc.com', '13800009922', '1973-11-05'), (3, 'yiibai3', 'Tech', 'http://www.zjptcc.com', '13800009900', '1973-11-05'), (4, 'yiibai4', 'Tech', 'http://www.zjuni.com', '13800009900', '1973-11-05'); -- -- Database: `test2` -- INSERT INTO `user` (`id`, `name`, `dept`, `website`, `phone`, `birthday`) VALUES (1, 'yiibai1', 'Tech', 'http://www.yiibai.com', '13800009911', '1973-11-05'), (2, '依蓓2', 'Tech', 'http://www.zjptcc.com', '13800009900', '1973-11-05'), (3, '依蓓3', 'Tech', 'http://www.zjptcc.com', '13800009900', '1973-11-05'), (4, '依依4', 'Tech', 'http://www.zjuni.com', '13800009900', '1973-11-05'); 数据源的配置在MVN项目的application.yml中
spring: datasource: url : jdbc:mysql://localhost:3306/yiibai?useSSL=false username : your-user password : your-passwd driver-class-name : com.mysql.jdbc.Driver test2ds: url : jdbc:mysql://localhost:3306/test2?useSSL=false username : your-user password : your-passwd driver-class-name : com.mysql.jdbc.Driver 修改username和password以适应你的数据库环境
五、DAO层接口和实体类
和Spring Mybatis实例SqlSessionDaoSupport混用xml配置和注解中的例子类似。其中IUser加@Mapper
注释并去掉public User oneByID(int id);方法。修改后内容如下：
package com.yiibai.mybatis.dao; import java.util.List; import org.apache.ibatis.annotations.Delete; import org.apache.ibatis.annotations.Insert; import org.apache.ibatis.annotations.Mapper; import org.apache.ibatis.annotations.Select; import org.apache.ibatis.annotations.Update; import com.yiibai.mybatis.models.User; @Mapper public interface IUser { @Select("select * from user where id= #{id}") public User getUserByID(int id); @Insert("insert into user(id,name, dept,phone,website,birthday) values(#{id},#{name}, #{dept},#{phone}, #{website}, #{birthday})") public int insertUser(User user); @Delete("delete from user where id=#{id}") public int deleteUserById(int id); @Update("update user set name=#{name},dept=#{dept},phone=#{phone},website=#{website},birthday=#{birthday} where id=#{id}") public int updateUser(User user); @Select("select * from user") public List<User> getAllUser(); }User类内容不变。加一个UserRowMapper类JdbcTemplate函数中使用，具体作用见Spring 的持久化实例中的三第2点中有详细说明。内容如下：
package com.yiibai.mybatis.models; import java.sql.ResultSet; import java.sql.SQLException; import org.springframework.jdbc.core.RowMapper; public class UserRowMapper implements RowMapper<User> { public User mapRow(ResultSet rs, int arg1) throws SQLException { // TODO 自动生成的方法存根 return new User(rs.getInt("id"),rs.getString("name"),rs.getString("dept") ,rs.getString("phone"),rs.getString("website"),rs.getDate("birthday")); } } 六、Server类
package com.yiibai.mybatis.service; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import com.yiibai.mybatis.dao.IUser; import com.yiibai.mybatis.models.User; @Service(value="userService") public class UserService { @Autowired private IUser iUser; public List<User> getAllUser() { // TODO 自动生成的方法存根 return iUser.getAllUser(); } public User getUserByID(int id) { // TODO 自动生成的方法存根 return iUser.getUserByID(id); } public int deleteUserById(int id) { // TODO 自动生成的方法存根 return iUser.deleteUserById(id); } public int updateUser(User user) { // TODO 自动生成的方法存根 return iUser.updateUser(user); } } 七、多数据源配置
package com.yiibai.mybatis.datasource; import javax.sql.DataSource; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder; import org.springframework.boot.context.properties.ConfigurationProperties; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.Primary; import org.springframework.jdbc.core.JdbcTemplate; @Configuration public class DataSourceConfig { @Bean(name = "primaryDataSource") @Qualifier("primaryDataSource") @ConfigurationProperties(prefix="spring.datasource") public DataSource primaryDataSource() { return DataSourceBuilder.create().build(); } @Bean(name = "secondaryDataSource") @Qualifier("secondaryDataSource") @Primary @ConfigurationProperties(prefix="spring.test2ds") public DataSource secondaryDataSource() { return DataSourceBuilder.create().build(); } @Bean(name = "primaryJdbcTemplate") public JdbcTemplate primaryJdbcTemplate( @Qualifier("primaryDataSource") DataSource dataSource) { return new JdbcTemplate(dataSource); } @Bean(name = "secondaryJdbcTemplate") public JdbcTemplate secondaryJdbcTemplate( @Qualifier("secondaryDataSource") DataSource dataSource) { return new JdbcTemplate(dataSource); } } 七、web控制类
这里实现了两个controller类，UserController注入了Service类实例、Ucontroller注入了JdbcTemplate类实例。代码如下：
package com.yiibai.mybatis.web; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RestController; import com.yiibai.mybatis.models.User; import com.yiibai.mybatis.service.UserService; @RestController @RequestMapping("/user") public class UserController { @Autowired @Qualifier("userService") // @Resource(name = "userService") private UserService userService; @RequestMapping(value = "/list", method = RequestMethod.GET) public List<User> getUsers() { return userService.getAllUser(); } @RequestMapping(value = "/{id}", method = RequestMethod.GET) public User getUserByID(@PathVariable("id") int id) { return userService.getUserByID(id); } }其中 userService会使用默认数据源，也就是在DataSourceConfig中有@Primary注释的那个DataSource
也就是在application.yml中spring.test2ds（数据库test2）那个。
package com.yiibai.mybatis.web; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.beans.factory.annotation.Qualifier; import org.springframework.jdbc.core.JdbcTemplate; import org.springframework.web.bind.annotation.PathVariable; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RestController; import com.yiibai.mybatis.models.User; import com.yiibai.mybatis.models.UserRowMapper; @RestController @RequestMapping("/u") public class Ucontroller { @Autowired @Qualifier("primaryJdbcTemplate") protected JdbcTemplate primaryJdbcTemplate; @Autowired @Qualifier("secondaryJdbcTemplate") protected JdbcTemplate secondaryJdbcTemplate; @RequestMapping(value = "/list", method = RequestMethod.GET) public List<User> getUsers() { String sql = "SELECT * FROM user"; return primaryJdbcTemplate.query(sql, new UserRowMapper()); } @RequestMapping(value = "/{id}", method = RequestMethod.GET) public User getUserByID(@PathVariable("id") int id) { String sql= "SELECT * FROM user WHERE id = '"+id+"' "; return secondaryJdbcTemplate.queryForObject(sql,new UserRowMapper()); } }八、主类：
package com.yiibai.mybatis; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.boot.context.embedded.ConfigurableEmbeddedServletContainer; import org.springframework.boot.context.embedded.EmbeddedServletContainerCustomizer; import org.springframework.web.bind.annotation.RestController; @SpringBootApplication @RestController public class SpringbootMutiDsApp implements EmbeddedServletContainerCustomizer{ public static void main(String[] args) { SpringApplication.run(SpringbootMutiDsApp.class, args); } public void customize(ConfigurableEmbeddedServletContainer container) { // TODO 自动生成的方法存根 container.setPort(8080); } } 九、运行：
. ____ _ __ _ _ /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \ \\/ ___)| |_)| | | | | || (_| | ) ) ) ) ' |____| .__|_| |_|_| |_\__, | / / / / =========|_|==============|___/=/_/_/_/ :: Spring Boot :: (v1.5.8.RELEASE) 2017-11-01 09:02:22.233 INFO 5972 --- [ main] com.yiibai.mybatis.SpringbootMutiDsApp : Starting SpringbootMutiDsApp on mymotif-Vostro-14-5480 with PID 5972 (/home/mymotif/workspace/SpringBootTest/target/classes started by mymotif in /home/mymotif/workspace/SpringBootTest) 2017-11-01 09:02:22.314 INFO 5972 --- [ main] com.yiibai.mybatis.SpringbootMutiDsApp : No active profile set, falling back to default profiles: default 2017-11-01 09:02:22.458 INFO 5972 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@56de5251: startup date [Wed Nov 01 09:02:22 CST 2017]; root of context hierarchy 2017-11-01 09:02:26.092 INFO 5972 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http) 2017-11-01 09:02:26.140 INFO 5972 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat] 2017-11-01 09:02:26.141 INFO 5972 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.23 2017-11-01 09:02:26.341 INFO 5972 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext 2017-11-01 09:02:26.341 INFO 5972 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 3895 ms 2017-11-01 09:02:26.509 INFO 5972 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/] 2017-11-01 09:02:26.514 INFO 5972 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*] 2017-11-01 09:02:26.514 INFO 5972 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*] 2017-11-01 09:02:26.515 INFO 5972 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*] 2017-11-01 09:02:26.515 INFO 5972 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*] 2017-11-01 09:02:27.587 INFO 5972 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@56de5251: startup date [Wed Nov 01 09:02:22 CST 2017]; root of context hierarchy 2017-11-01 09:02:27.676 INFO 5972 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/u/{id}],methods=[GET]}" onto public com.yiibai.mybatis.models.User com.yiibai.mybatis.web.Ucontroller.getUserByID(int) 2017-11-01 09:02:27.678 INFO 5972 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/u/list],methods=[GET]}" onto public java.util.List<com.yiibai.mybatis.models.User> com.yiibai.mybatis.web.Ucontroller.getUsers() 2017-11-01 09:02:27.679 INFO 5972 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/user/{id}],methods=[GET]}" onto public com.yiibai.mybatis.models.User com.yiibai.mybatis.web.UserController.getUserByID(int) 2017-11-01 09:02:27.680 INFO 5972 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/user/list],methods=[GET]}" onto public java.util.List<com.yiibai.mybatis.models.User> com.yiibai.mybatis.web.UserController.getUsers() 2017-11-01 09:02:27.685 INFO 5972 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse) 2017-11-01 09:02:27.685 INFO 5972 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest) 2017-11-01 09:02:27.718 INFO 5972 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 2017-11-01 09:02:27.719 INFO 5972 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 2017-11-01 09:02:27.759 INFO 5972 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 2017-11-01 09:02:28.045 INFO 5972 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup 2017-11-01 09:02:28.230 INFO 5972 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http) 2017-11-01 09:02:28.235 INFO 5972 --- [ main] com.yiibai.mybatis.SpringbootMutiDsApp : Started SpringbootMutiDsApp in 7.301 seconds (JVM running for 9.627) http://localhost:8080/user/list
http://localhost:8080/u/list
这里可以看出http://localhost:8080/user/list获得的是test2库中的user表数据
而http://localhost:8080/u/list获得的是yiibai库中（通过primaryJdbcTemplate）的user表数据
参考：
SpringBoot多数据源的配置(SpringBoot+MyBatis)
Spring Mybatis实例SqlSessionDaoSupport混用xml配置和注解
本文发表于2017年11月01日 12:34
(c)注：本文转载自https://my.oschina.net/u/2245781/blog/1559046，转载目的在于传递更多信息，并不代表本网赞同其观点和对其真实性负责。如有侵权行为，请联系我们，我们会及时删除.
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