如何使用Spring连接到两个不同的数据库，一个用于在同一应用程序中读取，另一个用于写入？

# 数据源1配置
spring.datasource.read.url=jdbc:mysql://localhost:3306/read_db
spring.datasource.read.username=username
spring.datasource.read.password=password
spring.datasource.read.driver-class-name=com.mysql.jdbc.Driver

# 数据源2配置
spring.datasource.write.url=jdbc:mysql://localhost:3306/write_db
spring.datasource.write.username=username
spring.datasource.write.password=password
spring.datasource.write.driver-class-name=com.mysql.jdbc.Driver

@Configuration
public class DataSourceConfig {

    @Bean(name = "readDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.read")
    public DataSource readDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "writeDataSource")
    @ConfigurationProperties(prefix = "spring.datasource.write")
    public DataSource writeDataSource() {
        return DataSourceBuilder.create().build();
    }

    @Bean(name = "readTransactionManager")
    public PlatformTransactionManager readTransactionManager(@Qualifier("readDataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }

    @Bean(name = "writeTransactionManager")
    public PlatformTransactionManager writeTransactionManager(@Qualifier("writeDataSource") DataSource dataSource) {
        return new DataSourceTransactionManager(dataSource);
    }
}

@Repository
public class UserDao {

    private final JdbcTemplate readJdbcTemplate;
    private final JdbcTemplate writeJdbcTemplate;

    @Autowired
    public UserDao(@Qualifier("readDataSource") DataSource readDataSource,
                   @Qualifier("writeDataSource") DataSource writeDataSource) {
        this.readJdbcTemplate = new JdbcTemplate(readDataSource);
        this.writeJdbcTemplate = new JdbcTemplate(writeDataSource);
    }

    public List<User> getUsers() {
        String sql = "SELECT * FROM users";
        return readJdbcTemplate.query(sql, new BeanPropertyRowMapper<>(User.class));
    }

    public void saveUser(User user) {
        String sql = "INSERT INTO users (name, email) VALUES (?, ?)";
        writeJdbcTemplate.update(sql, user.getName(), user.getEmail());
    }
}