1,先看个目录结构图
可以看到,我把要设置的配置文件都放在了config文件夹下面
2,Application.java是程序启动项,里面必须设置
3,application.properties是多数据源切换的配置文件
好,接下来开始进行多数据源的切换!!!
一、先看看application.properties文件吧,配置多数据源:dbType用的超高可用的com.zaxxer.hikari.HikariDataSource,这里比较关键
#springboot\u5355\u636E\u6E90\u914D\u7F6E
spring.datasource.url=jdbc:mysql://localhost:3306/fcoc-schedule?useUnicode=true&useSSL=false&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&autoReconnect=true&failOverReadOnly=false&allowMultiQueries=true
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.dbType=MYSQL
spring.datasource.validateQuery=select 1
customer.datasource.names=db1,db2,db3
#springboot\u591A\u6570\u636E\u6E90\u914D\u7F6E
#\u6570\u636E\u6E901
customer.datasource.db1.url=jdbc:sqlserver://123.6.21.123:2433;databaseName=ecology8
customer.datasource.db1.username=spbcd
customer.datasource.db1.password=spb116688
customer.datasource.db1.driver-class-name=com.microsoft.sqlserver.jdbc.SQLServerDriver
customer.datasource.db1.dbType=com.zaxxer.hikari.HikariDataSource
customer.datasource.db1.max-idle=10
customer.datasource.db1.max-wait=10000
customer.datasource.db1.min-idle=5
customer.datasource.db1.initial-size=5
#\u6570\u636E\u6E902
customer.datasource.db2.url=jdbc:mysql://localhost:3306/fcoc-control?useUnicode=true&useSSL=false&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&autoReconnect=true&failOverReadOnly=false&allowMultiQueries=true
customer.datasource.db2.username=root
customer.datasource.db2.password=123456
customer.datasource.db2.driver-class-name=com.mysql.jdbc.Driver
customer.datasource.db2.dbType=com.zaxxer.hikari.HikariDataSource
customer.datasource.db2.max-idle=10
customer.datasource.db2.max-wait=10000
customer.datasource.db2.min-idle=5
customer.datasource.db2.initial-size=5
customer.datasource.db3.url = jdbc:mysql://123.105.123.123:3306/iretail-web?useUnicode=true&characterEncoding=utf-8&zeroDateTimeBehavior=convertToNull&autoReconnect=true&failOverReadOnly=false
customer.datasource.db3.username = root
customer.datasource.db3.password = 123456
customer.datasource.db3.driver-class-name = com.mysql.jdbc.Driver
customer.datasource.db3.dbType=com.zaxxer.hikari.HikariDataSource
customer.datasource.db3.max-idle=10
customer.datasource.db3.max-wait=10000
customer.datasource.db3.min-idle=5
customer.datasource.db3.initial-size=5
#mybatis
mybatis.mapper-locations=classpath*:repo/*.xml
mybatis.type-aliases-package=com.dhc.fcoc
在applicationContext-dao.xml文件里面把默认的数据库配置给添加进去,根据自己项目的实际情况来添加。
sqlserver
TRUE
二、DynamicDataSourceRegister动态注册数据源的类,贴代码,仔细看里面的有些要根据自己项目来设置的项!别头铁去一顿瞎复制!!里面会有报错的,是因为所需要的其他类在下面要继续创建!!!别
package com.dhc.config;
import java.util.HashMap;
import java.util.Map;
import javax.sql.DataSource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.MutablePropertyValues;
import org.springframework.beans.PropertyValues;
import org.springframework.beans.factory.support.BeanDefinitionRegistry;
import org.springframework.beans.factory.support.GenericBeanDefinition;
import org.springframework.boot.autoconfigure.jdbc.DataSourceBuilder;
import org.springframework.boot.bind.RelaxedDataBinder;
import org.springframework.boot.bind.RelaxedPropertyResolver;
import org.springframework.context.EnvironmentAware;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.ImportBeanDefinitionRegistrar;
import org.springframework.core.convert.ConversionService;
import org.springframework.core.convert.support.DefaultConversionService;
import org.springframework.core.env.Environment;
import org.springframework.core.type.AnnotationMetadata;
/**
*
* @FileName DynamicDataSourceRegister.java
* @Author 肖高翔
* @At 2018年6月16日 上午10:08:31
* @Desc 动态数据源注册,启动动态数据源请在启动类中(Application.java中添加 @Import(DynamicDataSourceRegister.class))
*
*/
@Configuration
public class DynamicDataSourceRegister implements ImportBeanDefinitionRegistrar, EnvironmentAware {
private static final Logger logger = LoggerFactory.getLogger(DynamicDataSourceRegister.class);
private ConversionService conversionService = new DefaultConversionService();
private PropertyValues dataSourcePropertyValues;
// 如配置文件中未指定数据源类型,使用该默认值
private static final Object DATASOURCE_TYPE_DEFAULT = "com.zaxxer.hikari.HikariDataSource";
// 数据源
private DataSource defaultDataSource;
private Map customDataSources = new HashMap<>();
@Override
public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) {
Map
三、DynamicDataSource动态数据源,这个切换全靠AbstractRoutingDataSource
package com.dhc.config;
import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;
/**
*
* @FileName DynamicDataSource.java
* @Author 肖高翔
* @At 2018年6月15日 上午10:41:17
* @Desc 动态数据源
*/
public class DynamicDataSource extends AbstractRoutingDataSource {
@Override
protected Object determineCurrentLookupKey() {
return DynamicDataSourceContextHolder.getDataSourceType();
}
}
四、DynamicDataSourceAspect 利用AOP切换数据源Advice
package com.dhc.config;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Component;
/**
*
* @FileName DynamicDataSourceAspect.java
* @Author 肖高翔
* @At 2018年6月15日 上午10:41:47
* @Desc AOP切换数据源Advice
*/
@Aspect
@Order(-1) // 保证该AOP在@Transactional之前执行
@Component
public class DynamicDataSourceAspect {
private static final Logger logger = LoggerFactory.getLogger(DynamicDataSourceAspect.class);
@Before("@annotation(ds)")
public void changeDataSource(JoinPoint point, TargetDataSource ds) throws Throwable {
String dsId = ds.name();
if (!DynamicDataSourceContextHolder.containsDataSource(dsId)) {
System.out.println("数据源【{}】不存在,使用默认数据源 > {} " + ds.name() + " " + point.getSignature());
logger.error("数据源[{}]不存在,使用默认数据源 > {}", ds.name(), point.getSignature());
} else {
System.out.println("Use DataSource : {} > {} " + ds.name() + " " + point.getSignature());
logger.debug("Use DataSource : {} > {}", ds.name(), point.getSignature());
DynamicDataSourceContextHolder.setDataSourceType(ds.name());
}
}
@After("@annotation(ds)")
public void restoreDataSource(JoinPoint point, TargetDataSource ds) {
System.out.println("Revert DataSource : {} > {} " + ds.name() + " " + point.getSignature());
logger.debug("Revert DataSource : {} > {}", ds.name(), point.getSignature());
DynamicDataSourceContextHolder.clearDataSourceType();
}
}
五、DynamicDataSourceContextHolder保存切换的数据源
package com.dhc.config;
import java.util.ArrayList;
import java.util.List;
/**
*
* @FileName DynamicDataSourceContextHolder.java
* @Author 肖高翔
* @At 2018年6月16日 上午10:06:30
* @Desc 保存切换的数据源
*/
public class DynamicDataSourceContextHolder {
private static final ThreadLocal contextHolder = new ThreadLocal();
public static List dataSourceIds = new ArrayList<>();
/**
* 设置数据源名
*
* @Title setDataSourceType
* @Author 肖高翔
* @param dataSourceType
* void
*/
public static void setDataSourceType(String dataSourceType) {
System.out.println("切换到 { " + dataSourceType + " } 数据源");
contextHolder.set(dataSourceType);
}
/**
* 获取数据源名
*
* @Title getDataSourceType
* @Author 肖高翔
* @return String
*/
public static String getDataSourceType() {
return contextHolder.get();
}
/**
* 清除数据源名
*
* @Title clearDataSourceType
* @Author 肖高翔 void
*/
public static void clearDataSourceType() {
contextHolder.remove();
}
/**
* 判断指定DataSrouce当前是否存在
*
* @Title containsDataSource
* @Author 肖高翔
* @param dataSourceId
* @return boolean
*/
public static boolean containsDataSource(String dataSourceId) {
return dataSourceIds.contains(dataSourceId);
}
}
六、TargetDataSource在方法上使用该注解,用于指定使用哪个数据源,这是个注释类,看清楚啊!
package com.dhc.config;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
/**
*
* @FileName TargetDataSource.java
* @Author 肖高翔
* @At 2018年6月15日 上午10:44:41
* @Desc 在方法上使用该注解,用于指定使用哪个数据源
*/
@Target({ ElementType.METHOD, ElementType.TYPE })
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface TargetDataSource {
String name();
}
七、在Application.java启动程序里面添加@Import({ DynamicDataSourceRegister.class })
package com.dhc.fcoc;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.actuate.autoconfigure.CacheStatisticsAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration;
import org.springframework.boot.autoconfigure.data.redis.RedisRepositoriesAutoConfiguration;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;
import org.springframework.boot.autoconfigure.session.SessionAutoConfiguration;
import org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.feign.EnableFeignClients;
import org.springframework.context.annotation.Import;
import org.springframework.context.annotation.ImportResource;
import com.dhc.config.DynamicDataSourceRegister;
@ImportResource(locations = { "classpath*:/conf/applicationContext.xml", "classpath*:/conf/applicationContext-legacy.xml" })
@Import({ DynamicDataSourceRegister.class })
@EnableFeignClients
@EnableDiscoveryClient
@SpringBootApplication(exclude = { DataSourceAutoConfiguration.class, SessionAutoConfiguration.class, RedisAutoConfiguration.class,
RedisRepositoriesAutoConfiguration.class, CacheStatisticsAutoConfiguration.class, WebMvcAutoConfiguration.class })
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}
我是在项目的AS层(也就是service,我这里叫做AS层),方法头部用了注解方式,然后就实现了数据源的动态切换
package com.dhc.fcoc.job.chl.employee.as;
import java.io.IOException;
import java.util.List;
import org.apache.http.client.ClientProtocolException;
import org.springframework.stereotype.Service;
import com.dhc.config.HttpClientUtils;
import com.dhc.config.TargetDataSource;
import com.dhc.fcoc.common.message.ResultCodeEnum;
import com.dhc.fcoc.job.chl.employee.domain.ChlHrmresource;
import com.dhc.fcoc.job.chl.employee.repo.ChlHrmresourceRepo;
import com.dhc.fcoc.main.param.common.ParamFieldConstant;
import com.dhc.ilead.base.exception.BaseASException;
import com.dhc.ilead.base.exception.BaseRepoException;
import com.dhc.ilead.base.service.BaseService;
import net.sf.ezmorph.object.DateMorpher;
import net.sf.json.JSONArray;
import net.sf.json.util.JSONUtils;
@Service
public class ChlHrmresourceAS extends BaseService {
/**
* 查询OA系统中的人员信息, 并同步到erp系统中
*
* @Title batchInsert
* @Author 肖高翔
* @throws BaseASException
* void
* @throws IOException
* @throws ClientProtocolException
*/
@TargetDataSource(name = "db1") // 在这里使用注解,这个名字就是application.properties里面的names的数据源!自己根据项目自己定义
public void batchInsert() throws BaseASException, ClientProtocolException, IOException {
try {
// 查询人员信息
List chlHrmresourceList = getDefaultRepository().selectAllHrmresource();
// 封装成json
StringBuilder json = new StringBuilder();
String strJson = JSONArray.fromObject(chlHrmresourceList).toString();
// 这里必须加上日期转换的,否则查询出来的日期会自动转成long类型
JSONUtils.getMorpherRegistry().registerMorpher(new DateMorpher(new String[] { "yyyy-MM-dd HH:mm:ss", "yyyy-MM-dd" }));
json.append("{\"chlEmployeeDto\":");
json.append(strJson);
json.append("}");
// 调用httpclient封装好的方法即可
HttpClientUtils.httpClientMethod(ParamFieldConstant.EMPLOYEE_URL, json.toString());
} catch (BaseRepoException e) {
throw new BaseASException(ResultCodeEnum.DB_ERROR.getCode(), ResultCodeEnum.DB_ERROR.getMessage() + "," + "异常类:" + this.getClass().getName() + ","
+ "异常方法:" + Thread.currentThread().getStackTrace()[1].getMethodName(), e);
}
}
}
基本的pom.xml没有贴,用常规的配置就可以。
在这过程中发现的问题是:
1,spring boot ,前后端分离,然后服务都在中台服务中,如果直接在中台服务里面去设置这个多数据源切换,那么通过web端访问,他只能够切换成一个数据源,后面的就没用了。
2,可能的猜想是:在中台这端,事务就已经开启了。所以导致行不通。
3,当把切换数据源放在web端,放到事务未开始之前,就能够随意的进行切换,并且测试成功了。
有不明白spring boot中台的可以私信我。我来给你们解释一下这个概念。