这里我用的springboot项目,配置文件yml文件配置,gradle配置jar包依赖。
找了一天资料,终于整好了多数据源,步骤如下:
application.yml:
1 spring: 2 datasource: 3 driver-class-name: com.mysql.jdbc.Driver 4 url: jdbc:mysql://localhost:3306/base?characterEncoding=utf8&useSSL=false #5.5.45+, 5.6.26+ and 5.7.6+版本的mysql需要设置useSSL=false 5 username: root 6 password: 123456 7 maximum-pool-size: 100 #datasource公共配置start 8 max-idle: 10 9 max-wait: 10000 10 min-idle: 5 11 initial-size: 5 12 validation-query: SELECT 1 13 test-on-borrow: false 14 test-while-idle: true 15 time-between-eviction-runs-millis: 18800 #datasource公共配置end 16 jpa: 17 database: MYSQL 18 show-sql: true 19 hibernate: 20 ddl-auto: update #validate | update | create | create-drop 21 naming: 22 strategy: org.hibernate.cfg.DefaultNamingStrategy 23 properties: 24 hibernate: 25 dialect: org.hibernate.dialect.MySQL5Dialect #Hibernate方言 26 freemarker: 27 allow-request-override: false 28 allow-session-override: false 29 cache: false 30 charset: UTF-8 31 check-template-location: true 32 content-type: text/html 33 enabled: true 34 expose-request-attributes: false 35 expose-session-attributes: false 36 expose-spring-macro-helpers: true 37 prefer-file-system-access: true 38 suffix: .html #html静态页面 39 template-loader-path: classpath:/templates/ #模板路径 40 settings: 41 template_update_delay: 0 42 default_encoding: UTF-8 43 classic_compatible: true 44 date_format: yyyy-MM-dd 45 time_format: HH:mm:ss 46 datetime_format: yyyy-MM-dd HH:mm:ss 47 custom: 48 datasource: 49 names: ds1 #若需要添加其他数据源,可以直接在此处添加,用逗号隔开例如:(ds2,ds3),相应的下面的数据库配置只需要添加一个配置就可以了 50 ds1: 51 driver-class-name: com.mysql.jdbc.Driver 52 url: jdbc:mysql://localhost:3306/test1?characterEncoding=utf8&useSSL=false #5.5.45+, 5.6.26+ and 5.7.6+版本的mysql需要设置useSSL=false 53 username: root 54 password: 123456
build.gradle添加相关依赖:
1 // mysql依赖 2 compile(‘mysql:mysql-connector-java‘) 3 // druid依赖 4 compile(‘com.alibaba:druid:1.0.15‘) 5 // jpa依赖 6 compile(‘org.springframework.boot:spring-boot-starter-data-jpa‘) 7
下面是数据源的配置:
1 import org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource; 2 3 /** 4 * 动态数据源 5 */ 6 public class DynamicDataSource extends AbstractRoutingDataSource{ 7 8 /* 9 * 代码中的determineCurrentLookupKey方法取得一个字符串, 10 * 该字符串将与配置文件中的相应字符串进行匹配以定位数据源,配置文件,即applicationContext.xml文件中需要要如下代码:(non-Javadoc) 11 */ 12 @Override 13 protected Object determineCurrentLookupKey() { 14 return DynamicDataSourceContextHolder.getDataSourceType(); 15 } 16 }
1 import org.aspectj.lang.JoinPoint; 2 import org.aspectj.lang.annotation.After; 3 import org.aspectj.lang.annotation.Aspect; 4 import org.aspectj.lang.annotation.Before; 5 import org.springframework.core.annotation.Order; 6 import org.springframework.stereotype.Component; 7 8 /** 9 * 切换数据源Advice 10 */ 11 @Aspect 12 @Order(-10)//保证该AOP在@Transactional之前执行 13 @Component 14 public class DynamicDataSourceAspect { 15 16 17 /* 18 * @Before("@annotation(ds)") 19 * 的意思是: 20 * 21 * @Before:在方法执行之前进行执行: 22 * @annotation(targetDataSource): 23 * 会拦截注解targetDataSource的方法,否则不拦截; 24 */ 25 @Before("@annotation(targetDataSource)") 26 public void changeDataSource(JoinPoint point, TargetDataSource targetDataSource) throws Throwable { 27 //获取当前的指定的数据源; 28 String dsId = targetDataSource.value(); 29 //如果不在我们注入的所有的数据源范围之内,那么输出警告信息,系统自动使用默认的数据源。 30 if (!DynamicDataSourceContextHolder.containsDataSource(dsId)) { 31 System.err.println("数据源[{}]不存在,使用默认数据源 > {}"+targetDataSource.value()+point.getSignature()); 32 } else { 33 System.out.println("Use DataSource : {} > {}"+targetDataSource.value()+point.getSignature()); 34 //找到的话,那么设置到动态数据源上下文中。 35 DynamicDataSourceContextHolder.setDataSourceType(targetDataSource.value()); 36 } 37 } 38 39 @After("@annotation(targetDataSource)") 40 public void restoreDataSource(JoinPoint point, TargetDataSource targetDataSource) { 41 System.out.println("Revert DataSource : {} > {}"+targetDataSource.value()+point.getSignature()); 42 //方法执行完毕之后,销毁当前数据源信息,进行垃圾回收。 43 DynamicDataSourceContextHolder.clearDataSourceType(); 44 } 45 46 47 }
1 import java.util.ArrayList; 2 import java.util.List; 3 4 /** 5 * 动态数据源上下文 6 */ 7 public class DynamicDataSourceContextHolder { 8 /* 9 * 当使用ThreadLocal维护变量时,ThreadLocal为每个使用该变量的线程提供独立的变量副本, 10 * 所以每一个线程都可以独立地改变自己的副本,而不会影响其它线程所对应的副本。 11 */ 12 private static final ThreadLocal<String> contextHolder = new ThreadLocal<>(); 13 14 /* 15 * 管理所有的数据源id; 16 * 主要是为了判断数据源是否存在; 17 */ 18 public static List<String> dataSourceIds = new ArrayList<>(); 19 20 21 /** 22 * 使用setDataSourceType设置当前的 23 */ 24 public static void setDataSourceType(String dataSourceType){ 25 contextHolder.set(dataSourceType); 26 } 27 28 29 /** 30 * 获取当前线程中的数据源 31 */ 32 public static String getDataSourceType(){ 33 return contextHolder.get(); 34 } 35 36 /** 37 * 删除当前线程池中的数据源 38 */ 39 public static void clearDataSourceType(){ 40 contextHolder.remove(); 41 } 42 43 public static boolean containsDataSource(String dataSourceId){ 44 return dataSourceIds.contains(dataSourceId); 45 } 46 47 }
import java.util.HashMap; import java.util.Map; import javax.sql.DataSource; 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.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; /** * 动态数据源注册 */ public class DynamicDataSourceRegister implements ImportBeanDefinitionRegistrar, EnvironmentAware { //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 = "org.apache.tomcat.jdbc.pool.DataSource"; private ConversionService conversionService = new DefaultConversionService(); private PropertyValues dataSourcePropertyValues; // 默认数据源 private DataSource defaultDataSource; private Map<String, DataSource> customDataSources = new HashMap<String, DataSource>(); /** * 加载多数据源配置 */ @Override public void setEnvironment(Environment environment) { System.out.println("DynamicDataSourceRegister.setEnvironment()"); initDefaultDataSource(environment); initCustomDataSources(environment); } /** * 加载主数据源配置. */ private void initDefaultDataSource(Environment env) { // 读取主数据源 RelaxedPropertyResolver propertyResolver = new RelaxedPropertyResolver(env, "spring.datasource."); Map<String, Object> dsMap = new HashMap<String, Object>(); dsMap.put("type", propertyResolver.getProperty("type")); dsMap.put("driverClassName", propertyResolver.getProperty("driverClassName")); dsMap.put("url", propertyResolver.getProperty("url")); dsMap.put("username", propertyResolver.getProperty("username")); dsMap.put("password", propertyResolver.getProperty("password")); //创建数据源; defaultDataSource = buildDataSource(dsMap); dataBinder(defaultDataSource, env); } /** * 初始化更多数据源 */ private void initCustomDataSources(Environment env) { // 读取配置文件获取更多数据源,也可以通过defaultDataSource读取数据库获取更多数据源 RelaxedPropertyResolver propertyResolver = new RelaxedPropertyResolver(env, "custom.datasource."); String dsPrefixs = propertyResolver.getProperty("names"); for (String dsPrefix : dsPrefixs.split(",")) {// 多个数据源 Map<String, Object> dsMap = propertyResolver.getSubProperties(dsPrefix + "."); DataSource ds = buildDataSource(dsMap); customDataSources.put(dsPrefix, ds); dataBinder(ds, env); } } /** * 创建datasource. */ @SuppressWarnings("unchecked") public DataSource buildDataSource(Map<String, Object> dsMap) { Object type = dsMap.get("type"); if (type == null) { type = DATASOURCE_TYPE_DEFAULT;// 默认DataSource } Class<? extends DataSource> dataSourceType; try { dataSourceType = (Class<? extends DataSource>) Class.forName((String) type); String driverClassName = dsMap.get("driverClassName").toString(); String url = dsMap.get("url").toString(); String username = dsMap.get("username").toString(); String password = dsMap.get("password").toString(); DataSourceBuilder factory = DataSourceBuilder.create().driverClassName(driverClassName).url(url).username(username).password(password).type(dataSourceType); return factory.build(); } catch (ClassNotFoundException e) { e.printStackTrace(); } return null; } /** * 为DataSource绑定更多数据 */ private void dataBinder(DataSource dataSource, Environment env) { RelaxedDataBinder dataBinder = new RelaxedDataBinder(dataSource); dataBinder.setConversionService(conversionService); dataBinder.setIgnoreNestedProperties(false);//false dataBinder.setIgnoreInvalidFields(false);//false dataBinder.setIgnoreUnknownFields(true);//true if (dataSourcePropertyValues == null) { Map<String, Object> rpr = new RelaxedPropertyResolver(env, "spring.datasource").getSubProperties("."); Map<String, Object> values = new HashMap<>(rpr); // 排除已经设置的属性 values.remove("type"); values.remove("driverClassName"); values.remove("url"); values.remove("username"); values.remove("password"); dataSourcePropertyValues = new MutablePropertyValues(values); } dataBinder.bind(dataSourcePropertyValues); } @Override public void registerBeanDefinitions(AnnotationMetadata importingClassMetadata, BeanDefinitionRegistry registry) { System.out.println("DynamicDataSourceRegister.registerBeanDefinitions()"); Map<Object, Object> targetDataSources = new HashMap<Object, Object>(); // 将主数据源添加到更多数据源中 targetDataSources.put("dataSource", defaultDataSource); DynamicDataSourceContextHolder.dataSourceIds.add("dataSource"); // 添加更多数据源 targetDataSources.putAll(customDataSources); for (String key : customDataSources.keySet()) { DynamicDataSourceContextHolder.dataSourceIds.add(key); } // 创建DynamicDataSource GenericBeanDefinition beanDefinition = new GenericBeanDefinition(); beanDefinition.setBeanClass(DynamicDataSource.class); beanDefinition.setSynthetic(true); MutablePropertyValues mpv = beanDefinition.getPropertyValues(); //添加属性:AbstractRoutingDataSource.defaultTargetDataSource mpv.addPropertyValue("defaultTargetDataSource", defaultDataSource); mpv.addPropertyValue("targetDataSources", targetDataSources); registry.registerBeanDefinition("dataSource", beanDefinition); } }
1 import java.lang.annotation.Documented; 2 import java.lang.annotation.ElementType; 3 import java.lang.annotation.Retention; 4 import java.lang.annotation.RetentionPolicy; 5 import java.lang.annotation.Target; 6 7 /** 8 * 在方法上使用,用于指定使用哪个数据源 9 */ 10 @Target({ElementType.METHOD,ElementType.TYPE}) 11 @Retention(RetentionPolicy.RUNTIME) 12 @Documented 13 public @interface TargetDataSource { 14 String value(); 15 }
测试:
在Controller里:
1 @Resource 2 private TestService testService;
1 @Service 2 public class TestService { 3 4 @Resource 5 private TestDao testDao; 6 7 8 /** 9 * 不指定数据源使用默认数据源 10 * @return 11 */ 12 public List<User> getList(){ 13 return testDao.getList(); 14 } 15 16 /** 17 * 指定数据源 18 * @return 19 */ 20 @TargetDataSource("ds1") 21 public List<User> getListByDs1(){ 22 //return testDao.getListByDs1(); 23 } 24 25 }
import java.sql.ResultSet; import java.sql.SQLException; import java.util.List; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.jdbc.core.JdbcTemplate; import org.springframework.jdbc.core.RowMapper; import org.springframework.stereotype.Component; @Component public class TestDao { @Autowired private JdbcTemplate jdbcTemplate; /** * 不指定数据源使用默认数据源 * @return */ public List<User> getList(){ String sql = "select * from user"; return (List<User>) jdbcTemplate.query(sql, new RowMapper<User>(){ @Override public User mapRow(ResultSet rs, int rowNum) throws SQLException { User user = new User(); user.setId(rs.getLong("id")); user.setName(rs.getString("name"));; return user; } }); } /** * 指定数据源 * 在对应的service进行指定; * @return * @author SHANHY * @create 2016年1月24日 */ public List<User> getListByDs1(){ /* * 这张表示复制的主库到ds1的,在ds中并没有此表. * 需要自己自己进行复制,不然会报错:Table ‘test1.User1‘ doesn‘t exist */ String sql = "select * from user"; return (List<User>) jdbcTemplate.query(sql, new RowMapper<User>(){ @Override public User mapRow(ResultSet rs, int rowNum) throws SQLException { User user = new User(); user.setId(rs.getLong("id")); user.setName(rs.getString("name"));; return user; } }); } }
至于user表和user对应的实体类,自己创建一个就好。