Configure múltiples fuentes de datos y use anotaciones

¡Permítanme explicar primero! Soy diferente de muchas personas en Internet. Utilizo el método de anotación. Hay muchos bloggers en Internet. Hay una especie de base de datos y un paquete de mapeador. ¡Pon una pieza directamente, úsala según tu propio método! ¡No pises el pozo!

El primero es la configuración del archivo yum de configuración de mi fuente de datos: (tenga en cuenta el espacio en este archivo de configuración)

//mysql数据库
spring:
  datasource:
    type: com.alibaba.druid.pool.DruidDataSource
    druid:
      driver-class-name: com.mysql.jdbc.Driver
      url: jdbc:mysql://localhost:3306/db_mj?allowMultiQueries=true&useUnicode=true&characterEncoding=UTF-8&useSSL=true
      username: root
      password: toot
#sqlserver数据库配置
dynamic:
  datasource:
    slave1:
#      driver-class-name: com.microsoft.sqlserver.jdbc.SQLServerDriver
      url: jdbc:sqlserver://192.168.1.235;databasename=DB
      username: root
      password: root

Crear un paquete de fuente de datos

1. Cree un paquete de anotaciones, cree un archivo DataSource en este paquete

/**
 * @Author Simon
 * @Method 
 * @Version 1.0
 * @Return 
 * @Exception 多文件注解 
 * @Date 2019-08-23 0023 09:49:53
 */
 
@Target({ElementType.METHOD, ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
@Inherited
public @interface DataSource {
    String value() default "";
}

2. Cree un paquete de aspecto, que crea un archivo: DataSourceAspect

/**
 * @Author Simon
 * @Method
 * @Version 1.0
 * @Return
 * @Exception 多数据源，切面处理类
 * @Date 2019-08-23 0023 09:52:09
 */

@Aspect
@Component
@Order(Ordered.HIGHEST_PRECEDENCE)
public class DataSourceAspect {
    protected Logger logger = LoggerFactory.getLogger(getClass());

    @Pointcut("@annotation(com.mj.admin.datasource.annotation.DataSource) " +
            "|| @within(com.mj.admin.datasource.annotation.DataSource)")
    public void dataSourcePointCut() {

    }

    @Around("dataSourcePointCut()")
    public Object around(ProceedingJoinPoint point) throws Throwable {
        MethodSignature signature = (MethodSignature) point.getSignature();
        Class targetClass = point.getTarget().getClass();
        Method method = signature.getMethod();

        DataSource targetDataSource = (DataSource)targetClass.getAnnotation(DataSource.class);
        DataSource methodDataSource = method.getAnnotation(DataSource.class);
        if(targetDataSource != null || methodDataSource != null){
            String value;
            if(methodDataSource != null){
                value = methodDataSource.value();
            }else {
                value = targetDataSource.value();
            }

            DynamicContextHolder.push(value);
            logger.debug("set datasource is {}", value);
        }

        try {
            return point.proceed();
        } finally {
            DynamicContextHolder.poll();
            logger.debug("clean datasource");
        }
    }
}

3. Cree un paquete de configuración: cree archivos dentro: DynamicContextHolder, DynamicDataSource, DynamicDataSourceConfig, DynamicDataSourceFactory, cuatro archivos a continuación. He publicado el código por turno

/**
 * @Author Simon
 * @Method 
 * @Version 1.0
 * @Return 
 * @Exception 多数据源上下文
 * @Date 2019-08-23 0023 09:58:03
 */
 
public class DynamicContextHolder {
    @SuppressWarnings("unchecked")
    private static final ThreadLocal<Deque<String>> CONTEXT_HOLDER = new ThreadLocal() {
        @Override
        protected Object initialValue() {
            return new ArrayDeque();
        }
    };

    /**
     * 获得当前线程数据源
     *
     * @return 数据源名称
     */
    public static String peek() {
        System.out.println(CONTEXT_HOLDER.get().peek()+"数据源名称是");
        return CONTEXT_HOLDER.get().peek();
    }

    /**
     * 设置当前线程数据源
     *
     * @param dataSource 数据源名称
     */
    public static void push(String dataSource) {
        CONTEXT_HOLDER.get().push(dataSource);
    }

    /**
     * 清空当前线程数据源
     */
    public static void poll() {
        Deque<String> deque = CONTEXT_HOLDER.get();
        deque.poll();
        if (deque.isEmpty()) {
            CONTEXT_HOLDER.remove();
        }
    }

}

/**
 * @Author Simon
 * @Method
 * @Version 1.0
 * @Return
 * @Exception  多数据源
 * @Date 2019-08-23 0023 10:04:30
 */

public class DynamicDataSource extends AbstractRoutingDataSource {

    @Override
    protected Object determineCurrentLookupKey() {
        return DynamicContextHolder.peek();
    }

}

/**
 * @Author Simon
 * @Method 
 * @Version 1.0
 * @Return 
 * @Exception 配置多数据源
 * @Date 2019-08-23 0023 10:05:01
 */
 
@Configuration
@EnableConfigurationProperties(DynamicDataSourceProperties.class)
public class DynamicDataSourceConfig {
    @Autowired
    private DynamicDataSourceProperties properties;

    @Bean
    @ConfigurationProperties(prefix = "spring.datasource.druid")
    public DataSourceProperties dataSourceProperties() {
        return new DataSourceProperties();
    }

    @Bean
    public DynamicDataSource dynamicDataSource(DataSourceProperties dataSourceProperties) {
        DynamicDataSource dynamicDataSource = new DynamicDataSource();
        dynamicDataSource.setTargetDataSources(getDynamicDataSource());

        //默认数据源
        DruidDataSource defaultDataSource = DynamicDataSourceFactory.buildDruidDataSource(dataSourceProperties);
        dynamicDataSource.setDefaultTargetDataSource(defaultDataSource);

        return dynamicDataSource;
    }

    private Map<Object, Object> getDynamicDataSource(){
        Map<String, DataSourceProperties> dataSourcePropertiesMap = properties.getDatasource();
        Map<Object, Object> targetDataSources = new HashMap<>(dataSourcePropertiesMap.size());
        dataSourcePropertiesMap.forEach((k, v) -> {
            DruidDataSource druidDataSource = DynamicDataSourceFactory.buildDruidDataSource(v);
            targetDataSources.put(k, druidDataSource);
        });

        return targetDataSources;
    }

}

/**
 * @Author Simon
 * @Method 
 * @Version 1.0
 * @Return 
 * @Exception DruidDataSource
 * @Date 2019-08-23 0023 10:06:37
 */
 
public class DynamicDataSourceFactory {

    public static DruidDataSource buildDruidDataSource(DataSourceProperties properties) {
        DruidDataSource druidDataSource = new DruidDataSource();
        druidDataSource.setDriverClassName(properties.getDriverClassName());
        druidDataSource.setUrl(properties.getUrl());
        druidDataSource.setUsername(properties.getUsername());
        druidDataSource.setPassword(properties.getPassword());

        druidDataSource.setInitialSize(properties.getInitialSize());
        druidDataSource.setMaxActive(properties.getMaxActive());
        druidDataSource.setMinIdle(properties.getMinIdle());
        druidDataSource.setMaxWait(properties.getMaxWait());
        druidDataSource.setTimeBetweenEvictionRunsMillis(properties.getTimeBetweenEvictionRunsMillis());
        druidDataSource.setMinEvictableIdleTimeMillis(properties.getMinEvictableIdleTimeMillis());
        druidDataSource.setMaxEvictableIdleTimeMillis(properties.getMaxEvictableIdleTimeMillis());
        druidDataSource.setValidationQuery(properties.getValidationQuery());
        druidDataSource.setValidationQueryTimeout(properties.getValidationQueryTimeout());
        druidDataSource.setTestOnBorrow(properties.isTestOnBorrow());
        druidDataSource.setTestOnReturn(properties.isTestOnReturn());
        druidDataSource.setPoolPreparedStatements(properties.isPoolPreparedStatements());
        druidDataSource.setMaxOpenPreparedStatements(properties.getMaxOpenPreparedStatements());
        druidDataSource.setSharePreparedStatements(properties.isSharePreparedStatements());

        try {
            druidDataSource.setFilters(properties.getFilters());
            druidDataSource.init();
        } catch (SQLException e) {
            e.printStackTrace();
        }
        return druidDataSource;
    }
}

4. Cree un paquete de propiedades, cree el archivo DataSourceProperties y pegue el código en secuencia en DynamicDataSourceProperties

/**
 * @Author Simon
 * @Method 
 * @Version 1.0
 * @Return 
 * @Exception 多数据源属性
 * @Date 2019-08-23 0023 10:14:18
 */
 
public class DataSourceProperties {
    private String driverClassName;
    private String url;
    private String username;
    private String password;

    /**
     * Druid默认参数
     */
    private int initialSize = 2;
    private int maxActive = 10;
    private int minIdle = -1;
    private long maxWait = 60 * 1000L;
    private long timeBetweenEvictionRunsMillis = 60 * 1000L;
    private long minEvictableIdleTimeMillis = 1000L * 60L * 30L;
    private long maxEvictableIdleTimeMillis = 1000L * 60L * 60L * 7;
    private String validationQuery = "select 1";
    private int validationQueryTimeout = -1;
    private boolean testOnBorrow = false;
    private boolean testOnReturn = false;
    private boolean testWhileIdle = true;
    private boolean poolPreparedStatements = false;
    private int maxOpenPreparedStatements = -1;
    private boolean sharePreparedStatements = false;
    private String filters = "stat,wall";

    public String getDriverClassName() {
        return driverClassName;
    }

    public void setDriverClassName(String driverClassName) {
        this.driverClassName = driverClassName;
    }

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public int getInitialSize() {
        return initialSize;
    }

    public void setInitialSize(int initialSize) {
        this.initialSize = initialSize;
    }

    public int getMaxActive() {
        return maxActive;
    }

    public void setMaxActive(int maxActive) {
        this.maxActive = maxActive;
    }

    public int getMinIdle() {
        return minIdle;
    }

    public void setMinIdle(int minIdle) {
        this.minIdle = minIdle;
    }

    public long getMaxWait() {
        return maxWait;
    }

    public void setMaxWait(long maxWait) {
        this.maxWait = maxWait;
    }

    public long getTimeBetweenEvictionRunsMillis() {
        return timeBetweenEvictionRunsMillis;
    }

    public void setTimeBetweenEvictionRunsMillis(long timeBetweenEvictionRunsMillis) {
        this.timeBetweenEvictionRunsMillis = timeBetweenEvictionRunsMillis;
    }

    public long getMinEvictableIdleTimeMillis() {
        return minEvictableIdleTimeMillis;
    }

    public void setMinEvictableIdleTimeMillis(long minEvictableIdleTimeMillis) {
        this.minEvictableIdleTimeMillis = minEvictableIdleTimeMillis;
    }

    public long getMaxEvictableIdleTimeMillis() {
        return maxEvictableIdleTimeMillis;
    }

    public void setMaxEvictableIdleTimeMillis(long maxEvictableIdleTimeMillis) {
        this.maxEvictableIdleTimeMillis = maxEvictableIdleTimeMillis;
    }

    public String getValidationQuery() {
        return validationQuery;
    }

    public void setValidationQuery(String validationQuery) {
        this.validationQuery = validationQuery;
    }

    public int getValidationQueryTimeout() {
        return validationQueryTimeout;
    }

    public void setValidationQueryTimeout(int validationQueryTimeout) {
        this.validationQueryTimeout = validationQueryTimeout;
    }

    public boolean isTestOnBorrow() {
        return testOnBorrow;
    }

    public void setTestOnBorrow(boolean testOnBorrow) {
        this.testOnBorrow = testOnBorrow;
    }

    public boolean isTestOnReturn() {
        return testOnReturn;
    }

    public void setTestOnReturn(boolean testOnReturn) {
        this.testOnReturn = testOnReturn;
    }

    public boolean isTestWhileIdle() {
        return testWhileIdle;
    }

    public void setTestWhileIdle(boolean testWhileIdle) {
        this.testWhileIdle = testWhileIdle;
    }

    public boolean isPoolPreparedStatements() {
        return poolPreparedStatements;
    }

    public void setPoolPreparedStatements(boolean poolPreparedStatements) {
        this.poolPreparedStatements = poolPreparedStatements;
    }

    public int getMaxOpenPreparedStatements() {
        return maxOpenPreparedStatements;
    }

    public void setMaxOpenPreparedStatements(int maxOpenPreparedStatements) {
        this.maxOpenPreparedStatements = maxOpenPreparedStatements;
    }

    public boolean isSharePreparedStatements() {
        return sharePreparedStatements;
    }

    public void setSharePreparedStatements(boolean sharePreparedStatements) {
        this.sharePreparedStatements = sharePreparedStatements;
    }

    public String getFilters() {
        return filters;
    }

    public void setFilters(String filters) {
        this.filters = filters;
    }
}

/**
 * @Author Simon
 * @Method 
 * @Version 1.0
 * @Return 
 * @Exception 多数据源属性
 * @Date 2019-08-23 0023 10:16:18
 */
 
@ConfigurationProperties(prefix = "dynamic")
public class DynamicDataSourceProperties {
    private Map<String, DataSourceProperties> datasource = new LinkedHashMap<>();

    public Map<String, DataSourceProperties> getDatasource() {
        return datasource;
    }

    public void setDatasource(Map<String, DataSourceProperties> datasource) {
        this.datasource = datasource;
    }
}

aop

public class DynamicDataSourceAnnotationAdvisor extends AbstractPointcutAdvisor implements BeanFactoryAware {
    private Advice advice;

    private Pointcut pointcut;

    public DynamicDataSourceAnnotationAdvisor(DynamicDataSourceAnnotationInterceptor dynamicDataSourceAnnotationInterceptor) {
        this.advice = dynamicDataSourceAnnotationInterceptor;
        this.pointcut = buildPointcut();
    }

    @Override
    public Pointcut getPointcut() {
        return this.pointcut;
    }

    @Override
    public Advice getAdvice() {
        return this.advice;
    }

    @Override
    public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
        if (this.advice instanceof BeanFactoryAware) {
            ((BeanFactoryAware) this.advice).setBeanFactory(beanFactory);
        }
    }

    private Pointcut buildPointcut() {
        Pointcut cpc = (Pointcut) new AnnotationMatchingPointcut(DataSource.class, true);
        // 类注解
        Pointcut clpc = (Pointcut) AnnotationMatchingPointcut.forClassAnnotation(DataSource.class);
        // 方法注解
        Pointcut mpc = (Pointcut) AnnotationMatchingPointcut.forMethodAnnotation(DataSource.class);
        return new ComposablePointcut(cpc).union(clpc).union(mpc);
    }
}

public class DynamicDataSourceAnnotationInterceptor implements MethodInterceptor{
    private static final Logger logger = LoggerFactory.getLogger(DynamicDataSourceAnnotationInterceptor.class);


    /**
     * 缓存方法注解值
     */
    private static final Map<Method, String> METHOD_CACHE = new HashMap<>();

    @Override
    public Object invoke(MethodInvocation invocation) throws Throwable {
        try {
            String datasource = determineDatasource(invocation);
            if (! DynamicDataSourceContextHolder.containsDataSource(datasource)) {
                logger.info("数据源[{}]不存在，使用默认数据源 >", datasource);
            }
            DynamicDataSourceContextHolder.setDataSourceRouterKey(datasource);
            return invocation.proceed();
        } finally {
            DynamicDataSourceContextHolder.removeDataSourceRouterKey();
        }
    }
    private String determineDatasource(MethodInvocation invocation) {
        Method method = invocation.getMethod();
        if (METHOD_CACHE.containsKey(method)) {
            return METHOD_CACHE.get(method);
        } else {
            DataSource ds = method.isAnnotationPresent(DataSource.class) ? method.getAnnotation(DataSource.class)
                    : AnnotationUtils.findAnnotation(method.getDeclaringClass(), DataSource.class);
            METHOD_CACHE.put(method, ds.value());
            return ds.value();
        }
    }
}

/**
 * 通过aop拦截，获取注解上面的value的值key，然后取判断我们注册的keys集合中是否有这个key,如果没有，则使用默认数据源，如果有，则设置上下文中当前数据源的key为注解的value
 */
//@Aspect
//@Component
public class DynamicDataSourceAspect {
    private static final Logger logger = LoggerFactory.getLogger(DynamicDataSourceAspect.class);




    @Before("@annotation(ds)")//就这个地方
    public void changeDataSource(JoinPoint point, DataSource ds) throws Throwable {
        String dsId = ds.value();
        if (DynamicDataSourceContextHolder.dataSourceIds.contains(dsId)) {
            logger.debug("Use DataSource :{} >", dsId, point.getSignature());
        } else {
            logger.info("数据源[{}]不存在，使用默认数据源 >{}", dsId, point.getSignature());
            DynamicDataSourceContextHolder.setDataSourceRouterKey(dsId);
        }
    }

    @After("@annotation(ds)")
    public void restoreDataSource(JoinPoint point, DataSource ds) {
        logger.debug("Revert DataSource : " + ds.value() + " > " + point.getSignature());
        DynamicDataSourceContextHolder.removeDataSourceRouterKey();

    }
}

Hasta ahora, si desea saber cómo usarlo, consulte la publicación de blog anterior de Simon