java中sharding配置好后加入连接池怎么做

1. 首先需要引入ShardingSphere的数据源代理模块和连接池模块的依赖：

<dependency>
    <groupId>org.apache.shardingsphere</groupId>
    <artifactId>sharding-jdbc-core</artifactId>
    <version>${sharding-sphere.version}</version>
</dependency>
<dependency>
    <groupId>org.apache.shardingsphere</groupId>
    <artifactId>sharding-jdbc-core-spring-boot-starter</artifactId>
    <version>${sharding-sphere.version}</version>
</dependency>
<dependency>
    <groupId>org.apache.shardingsphere</groupId>
    <artifactId>sharding-jdbc-core-elasticjob-lite-spring-boot-starter</artifactId>
    <version>${sharding-sphere.version}</version>
</dependency>
<dependency>
    <groupId>org.apache.shardingsphere</groupId>
    <artifactId>sharding-jdbc-core-orchestration-spring-boot-starter</artifactId>
    <version>${sharding-sphere.version}</version>
</dependency>

2. 在application.yml文件中配置数据源及连接池：

spring:
  datasource:
    # 主库配置
    master:
      url: jdbc:mysql://localhost:3306/master_db?useSSL=false&characterEncoding=utf8&serverTimezone=UTC
      username: root
      password: root
      driver-class-name: com.mysql.cj.jdbc.Driver
      type: com.alibaba.druid.pool.DruidDataSource
      # 连接池配置
      initial-size: 5
      min-idle: 5
      max-active: 20
      max-wait: 60000
      validation-query: SELECT 1 FROM DUAL
      test-while-idle: true
      test-on-borrow: false
      test-on-return: false
      filters: stat,wall,log4j
    # 从库配置
    slave:
      url: jdbc:mysql://localhost:3306/slave_db?useSSL=false&characterEncoding=utf8&serverTimezone=UTC
      username: root
      password: root
      driver-class-name: com.mysql.cj.jdbc.Driver
      type: com.alibaba.druid.pool.DruidDataSource
      # 连接池配置
      initial-size: 5
      min-idle: 5
      max-active: 20
      max-wait: 60000
      validation-query: SELECT 1 FROM DUAL
      test-while-idle: true
      test-on-borrow: false
      test-on-return: false
      filters: stat,wall,log4j

3. 在Java代码中使用ShardingDataSource作为数据源：

@Autowired
private DataSource dataSource;

@Bean
public DataSource shardingDataSource() throws SQLException {
    return ShardingDataSourceFactory.createDataSource(dataSource);
}

使用以上配置后，就可以在Java代码中通过注入shardingDataSource来操作数据库了。