1、依赖pom.xml

<dependencies><!-- web --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><!-- test --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><!--启动时启动内置tomcat --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-tomcat</artifactId><scope>provided</scope></dependency><!--对Jsp支持 --><dependency><groupId>org.apache.tomcat.embed</groupId><artifactId>tomcat-embed-jasper</artifactId></dependency><!-- 支持jstl --><dependency><groupId>javax.servlet</groupId><artifactId>jstl</artifactId></dependency><!-- fastjson --><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>1.2.46</version></dependency><!-- MyBatis --><dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId><version>1.1.1</version></dependency><!-- MySql驱动 --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.16.22</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.0.6</version></dependency>
</dependencies>

2、配置数据库连接信息application.properties

#datasource:user
spring.datasource.user.url=jdbc:mysql://localhost:3306/licy?useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true
spring.datasource.user.username=root
spring.datasource.user.password=root
spring.datasource.user.driver=com.mysql.jdbc.Driver#datasource:task
spring.datasource.task.url=jdbc:mysql://localhost:3306/qding_hk_user?useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&allowMultiQueries=true
spring.datasource.task.username=root
spring.datasource.task.password=root
spring.datasource.task.driver=com.mysql.jdbc.Driver

3、创建实体src/main/java/pom/domain/Task.java、src/main/java/pom/domain/User.java

@Data
@NoArgsConstructor
@AllArgsConstructor
public class Task {private int id;private String name;private String cron;private String className;private String methodName;private String isDeleted;}

@Data
@NoArgsConstructor
@AllArgsConstructor
public class User {private int id;private String name;
}

4、创建dao类src/main/java/pom/dao/task/TaskDao.java、src/main/java/pom/dao/user/UserDao.java

public interface TaskDao {Task getTaskById(Task task);
}

public interface UserDao {User getUserById(User user);
}　

5、创建数据库文件src/main/resources/mapper/task/TaskMapper.xml、resources/mapper/user/UserMapper.xml

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE mapper PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN" "http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd">
<mapper namespace="pom.dao.task.TaskDao"><select id="getTaskById" resultType="pom.domain.Task"> SELECT * FROM task WHERE deleted = 0 and ID = #{id}</select>
</mapper>

<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE mapper PUBLIC "-//ibatis.apache.org//DTD Mapper 3.0//EN" "http://ibatis.apache.org/dtd/ibatis-3-mapper.dtd">
<mapper namespace="pom.dao.user.UserDao"><select id="getUserById" parameterType="pom.domain.User"resultType="pom.domain.User"> SELECT * FROM user WHERE ID = #{id}</select>
</mapper>

6、创建配置文件src/main/java/pom/config/TaskMapperConfig.java、src/main/java/pom/config/UserMapperConfig.java

@Configuration
@MapperScan(basePackages = { "pom.dao.task" }, sqlSessionFactoryRef = "taskSqlSessionFactory")
public class TaskMapperConfig {@Value("${spring.datasource.task.url}")private String url;@Value("${spring.datasource.task.username}")private String user;@Value("${spring.datasource.task.password}")private String password;@Value("${spring.datasource.task.driver}")private String driverClass;@Bean(name = "taskDataSource")@Primarypublic DataSource masterDataSource() {DruidDataSource dataSource = new DruidDataSource();dataSource.setDriverClassName(driverClass);dataSource.setUrl(url);dataSource.setUsername(user);dataSource.setPassword(password);return dataSource;}@Bean(name = "taskTransactionManager")@Primarypublic DataSourceTransactionManager masterTransactionManager() {return new DataSourceTransactionManager(masterDataSource());}@Bean(name = "taskSqlSessionFactory")@Primarypublic SqlSessionFactory masterSqlSessionFactory(@Qualifier("taskDataSource") DataSource masterDataSource)throws Exception {final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();sessionFactory.setDataSource(masterDataSource);sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/task/TaskMapper.xml"));return sessionFactory.getObject();}
}

@Configuration
@MapperScan(basePackages = { "pom.dao.user" }, sqlSessionFactoryRef = "userSqlSessionFactory")
public class UserMapperConfig {@Value("${spring.datasource.user.url}")private String url;@Value("${spring.datasource.user.username}")private String user;@Value("${spring.datasource.user.password}")private String password;@Value("${spring.datasource.user.driver}")private String driverClass;@Bean(name = "userDataSource")public DataSource master2DataSource() {DruidDataSource dataSource = new DruidDataSource();dataSource.setDriverClassName(driverClass);dataSource.setUrl(url);dataSource.setUsername(user);dataSource.setPassword(password);return dataSource;}@Bean(name = "userTransactionManager")public DataSourceTransactionManager master2TransactionManager() {return new DataSourceTransactionManager(master2DataSource());}@Bean(name = "userSqlSessionFactory")public SqlSessionFactory clusterSqlSessionFactory(@Qualifier("userDataSource") DataSource master2DataSource)throws Exception {final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();sessionFactory.setDataSource(master2DataSource);sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver().getResources("classpath:mapper/user/UserMapper.xml"));return sessionFactory.getObject();}}