1.添加依赖pom

        <dependency>
            <groupId>org.apache.shardingsphere</groupId>
            <artifactId>sharding-jdbc-spring-boot-starter</artifactId>
            <version>4.0.1</version>
        </dependency>

2.User实体类

@Setter
@Getter
@AllArgsConstructor
@NoArgsConstructor
@ToString
public class User {
    private String id;
    private String name;
    private Integer age;
}

3.建表语句，两张表分别为user_0,user_1

CREATE TABLE `user_0` (
  `id` varchar(100) NOT NULL DEFAULT '',
  `name` varchar(100) DEFAULT NULL,
  `age` tinyint(3) unsigned DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8

CREATE TABLE `user_1` (
  `id` varchar(100) NOT NULL DEFAULT '',
  `name` varchar(100) DEFAULT NULL,
  `age` tinyint(3) unsigned DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8

 4.userMapper

@Mapper
public interface UserMapper {
    @Select("select * from user")
    List<User> selectAll();
    @Delete("delete from user where id = #{id}")
    int deleteById(String id);
    @Insert("insert into user(name,age) values(#{user.name},#{user.age})")
    int insert(@Param("user") User user);
}

5.userController

@Controller
@RequestMapping("/user")
@RequiredArgsConstructor

public class UserController {
    private static  User user = new User();

    private final UserMapper userMapper;

    @PostMapping("/insert")
    @ResponseBody
    public int insert(@RequestBody User user) {
        return userMapper.insert(user);
    }

}

6.配置文件application.properties

#配置数据源名称ds1,ds2
spring.shardingsphere.datasource.names=ds1,ds2
spring.shardingsphere.datasource.ds1.type=com.zaxxer.hikari.HikariDataSource
spring.shardingsphere.datasource.ds1.driver-class-name=com.mysql.jdbc.Driver
spring.shardingsphere.datasource.ds1.jdbc-url=jdbc:mysql://127.0.0.1:3306/sharding
spring.shardingsphere.datasource.ds1.username=root
spring.shardingsphere.datasource.ds1.password=root

spring.shardingsphere.datasource.ds2.type=com.zaxxer.hikari.HikariDataSource
spring.shardingsphere.datasource.ds2.driver-class-name=com.mysql.jdbc.Driver
spring.shardingsphere.datasource.ds2.jdbc-url=jdbc:mysql://127.0.0.1:3306/sharding2
spring.shardingsphere.datasource.ds2.username=root
spring.shardingsphere.datasource.ds2.password=root

spring.shardingsphere.sharding.tables.user.actual-data-nodes=ds1.user_$->{0..1}
#指定表中主键生成策略 SNOWFLAKE
spring.shardingsphere.sharding.tables.user.key-generator.column=id
spring.shardingsphere.sharding.tables.user.key-generator.type=SNOWFLAKE
#指定分片策略 约定id 偶数添加到user_0表 奇数添加到user_1表
spring.shardingsphere.sharding.tables.user.table-strategy.inline.sharding-column=id
spring.shardingsphere.sharding.tables.user.table-strategy.inline.algorithm-expression=user_$->{id % 2}

# 打开 sql 输出日志
spring.shardingsphere.props.sql.show=true
#一个实体类对应两张表，覆盖
#spring.main.allow-bean-definition-overriding=true


# 写库数据源名称
spring.shardingsphere.rules.readwrite-splitting.data-sources.readwrite_ds.static-strategy.write-data-source-name=ds1
# 读库数据源列表，多个从数据源用逗号分隔
spring.shardingsphere.rules.readwrite-splitting.data-sources.readwrite_ds.static-strategy.read-data-source-names=ds2
# 负载均衡算法名称
spring.shardingsphere.rules.readwrite-splitting.data-sources.readwrite_ds.load-balancer-name=round_robin

# 负载均衡算法配置
spring.shardingsphere.rules.readwrite-splitting.load-balancers.round_robin.type=ROUND_ROBIN

7.启动程序，调用插入接口会发现偶数id添加到user_0表，奇数id添加到user_1表