Java spring boot使用spring jdbc连接多个数据库

application.properties里的配置如下，注意要使用jdbc-url，否则会出现jdbcUrl is required with driverClassName：

spring.datasource.primary.jdbc-url=jdbc:mysql://xxx1/xxx
spring.datasource.primary.username=xxx
spring.datasource.primary.password=xxx

spring.datasource.secondary.jdbc-url=jdbc:mysql://xxx.xxx.xxx.xxx:xxxx/xxx
spring.datasource.secondary.username = xxxx
spring.datasource.secondary.password = xxxx

DataSourceConfig，一般就找个config文件夹放着：

import javax.sql.DataSource;

import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.boot.jdbc.DataSourceBuilder;

@Configuration
public class DataSourceConfig {

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

    @Bean(name = "secondaryDataSource")
    @Qualifier("secondaryDataSource")
    @Primary
    @ConfigurationProperties(prefix="spring.datasource.secondary")
    public DataSource secondaryDataSource() {
        return DataSourceBuilder.create().build();      
    }


    @Bean(name="primaryJdbcTemplate")
    public JdbcTemplate primaryJdbcTemplate (@Qualifier("primaryDataSource")  DataSource dataSource ) {
        return new JdbcTemplate(dataSource);
    }

    @Bean(name="secondaryJdbcTemplate")
    public JdbcTemplate  secondaryJdbcTemplate(@Qualifier("secondaryDataSource") DataSource dataSource) {
        return new JdbcTemplate(dataSource);
    }

}

在dao层，也就是实际从数据库查询数据的那一层，这样使用，在Qualifier后写需要的连接配置：

@Autowired
@Qualifier("primaryJdbcTemplate")
public JdbcTemplate jdbcTemplate;

特别注意一不小心会报错 jdbcUrl is required with driverClassName 。