SpringBoot整合 Mybatis+druid连接池，监控+多数据源配置+tkmybatis
1.tk.mybatis 通用Mapper 很好用的 mybatis 插件。
2.druid，阿里巴巴出品的sql连接池，监控，很强大的一个应用。
3.项目中有时候不止一个数据源，可能会有多个，那就需要自己配置了
A.SpringBoot 整合 Mybatis
1.配置pom坐标
org.mybatis.spring.boot
mybatis-spring-boot-starter
1.3.2
mysql
mysql-connector-java
加入 mybatis-spring-boot-starter 和 mysql-connector-java
2.配置 application.yml 文件：
spring:
datasource:
base:
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/zhangzq?useUnicode=true&characterEncoding=utf-8&useSSL=false&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC&zeroDateTimeBehavior=convertToNull
username: root
password: root这样配置是为了更好的配置多数据源。但数据源的时候也可以这样配置，如果想不自己配置 DataSource 则 直接配 spring.datasource.url 这样...
3.配置DataSource
import org.apache.ibatis.session.SqlSessionFactory;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.jdbc.datasource.DataSourceTransactionManager;
import tk.mybatis.spring.annotation.MapperScan;
import com.alibaba.druid.pool.DruidDataSource;
import javax.sql.DataSource;
import java.sql.SQLException;
@Configuration
@MapperScan(
// 此处的mapper 可以有多个
basePackages = { BaseDataSourceConfig.MAPPER_PACKAGE },
sqlSessionFactoryRef = "baseSqlSessionTemplate"
)
public class BaseDataSourceConfig {
// mapper 的xml存放路径
protected final static String MAPPER_XML_AREA = "classpath:com/zzq/zhangzq/mapper/*.xml";
// mapper.java 存放路径，被@MapperScan扫描的，注入 sqlsession的
protected final static String MAPPER_PACKAGE = "com.zzq.zhangzq.mapper";
@Value("${spring.datasource.base.url}")
private String url;
@Value("${spring.datasource.base.username}")
private String user;
@Value("${spring.datasource.base.password}")
private String password;
@Value("${spring.datasource.base.driver-class-name}")
private String driverClass;
/**
* 注入 datasource
* @return
*/
@Bean(name = "baseDataSource")
@ConfigurationProperties( prefix = "spring.datasource.base")
@Primary
public DataSource setDataSource() {
// 使用druid 则这样注入 dataSource，不需要则直接 DataSourceBuilder.create().build()
DruidDataSource dataSource = new DruidDataSource();
dataSource.setDriverClassName(driverClass);
dataSource.setUrl(url);
dataSource.setUsername(user);
dataSource.setPassword(password);
try {
// 如果想使用 Druid 的sql监控则，此处需要写 stat
dataSource.setFilters("stat");
} catch (SQLException e) {
e.printStackTrace();
}
return dataSource;
}
/**
* 注入 事务，在 serviceImpl 的时候使用
* @return
*/
@Bean(name = "baseTransationManager")
@Primary
public DataSourceTransactionManager setTransactionManager(){
// 传入 dataSource
return new DataSourceTransactionManager( setDataSource() );
}
/**
* 注入 sqlSession
* @return
* @throws Exception
*/
@Bean(name = "baseSqlSessionTemplate")
@Primary
public SqlSessionFactory setSqlSessionFactory() throws Exception {
final SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(setDataSource());
// 设置mapper.xml 扫描路径
bean.setMapperLocations( new PathMatchingResourcePatternResolver().getResources(BaseDataSourceConfig.MAPPER_XML_AREA) );
return bean.getObject();
}
}注意：如果使用的是 tkmybatis , 注解中的 MapperScan 是 tk.mybatis.spring.annotation.MapperScan 包下的。如果用成 mybatis包i下的了则会报错。里面的注释可以看看
4.tk.mybatis
tk.mybatis
mapper-spring-boot-starter
1.2.4
tkmybatis ,基本上不需要怎么配置，很好用，Mapper的继承就ok了，下面我会给出代码的。
B.druid
1.pom.xml
com.alibaba
druid-spring-boot-starter
1.1.10
2.配置：
import com.alibaba.druid.support.http.StatViewFilter;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import java.util.HashMap;
import java.util.Map;
/**
* druid 配置.
*/
@Configuration
public class DruidConfiguration {
/*
* 注册过滤器
* @return
*/
@Bean
public FilterRegistrationBean setDruidFilter(){
FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();
filterRegistrationBean.addUrlPatterns("/*");
filterRegistrationBean.setFilter( new WebStatFilter());
Map initParameters = new HashMap<>();
initParameters.put("exclusions", "*.js,*.html,*.gif,*.jpg,*.png,*.css,*.ico,*.jsp,/druid/*,/download/*");
filterRegistrationBean.setInitParameters( initParameters );
return filterRegistrationBean;
}
/**
* 注册一个StatViewServlet
* @return
*/
@Bean
public ServletRegistrationBean setDruidServlet(){
ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean();
servletRegistrationBean.setServlet( new StatViewServlet() );
servletRegistrationBean.addUrlMappings("/druid/*");
Map initParameters = new HashMap<>();
initParameters.put("resetEnable", "false"); //禁用HTML页面上的“Rest All”功能
initParameters.put("allow", ""); //ip白名单（没有配置或者为空，则允许所有访问）
initParameters.put("loginUsername", "maxwell"); //++监控页面登录用户名
initParameters.put("loginPassword", "pkusoft"); //++监控页面登录用户密码
initParameters.put("deny", ""); //ip黑名单
//如果某个ip同时存在，deny优先于allow
servletRegistrationBean.setInitParameters(initParameters);
return servletRegistrationBean;
}
} 注意此处的类不要写错了。写错了会出问题的。比如说访问 /druid/ 的时候重定向过多，filter 不执行
C.多数据源配置
1.application.yml 配置
刚才配置的时候，就没有按照官方默认的方式写，就是为了好配多数据源，
spring:
datasource:
base:
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/zhangzq?useUnicode=true&characterEncoding=utf-8&useSSL=false&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC&zeroDateTimeBehavior=convertToNull
username: root
password: root
licm:
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/licm?useUnicode=true&characterEncoding=utf-8&useSSL=false&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC&zeroDateTimeBehavior=convertToNull
username: root
password: root2.配置从数据源
配置从数据源和配置主数据源差不多，类似，配置主数据源一定要加上 @Primary,从数据源则不需要。
@Configuration
@MapperScan(
basePackages = {"com.zzq.licm.mapper"},
sqlSessionFactoryRef = "licmSqlSession"
)
public class LicmDataSourceConfig {
@Value("${spring.datasource.licm.url}")
private String url;
@Value("${spring.datasource.licm.username}")
private String user;
@Value("${spring.datasource.licm.password}")
private String password;
@Value("${spring.datasource.licm.driver-class-name}")
private String driverClass;
@Bean(name = "licmDataSource")
public DataSource setDataSource(){
DruidDataSource dataSource = new DruidDataSource();
try {
dataSource.setFilters("stat");
} catch (SQLException e) {
e.printStackTrace();
}
dataSource.setUrl(url);
dataSource.setUsername(user);
dataSource.setPassword(password);
return dataSource;
}
@Bean(name = "licmTransation")
public DataSourceTransactionManager setTransationManager(){
return new DataSourceTransactionManager(setDataSource());
}
@Bean(name = "licmSqlSession")
public SqlSessionFactory setSqlSession() throws Exception {
SqlSessionFactoryBean bean = new SqlSessionFactoryBean();
bean.setDataSource(setDataSource());
bean.setMapperLocations( new PathMatchingResourcePatternResolver().getResources("classpath:com/zzq/licm/mapper/*.xml"));
return bean.getObject();
}
}3.配置启动器，mapper 之类的，先不放了，等下直接把源码放出来
@SpringBootApplication
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class , args);
}
}D.项目结构
请大家结合源码看该文章，省略部分为 mapper,service,impl.controller
使用 tk.mybatis 所有的Mapper 都要继承 tkmybatis 的Mapper
源码地址：https://github.com/winterme/pkusoft