JdbcTemplate 配置链接多个数据源的方法

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.4.4</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>zhang</groupId>
    <artifactId>DataConvertion</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>DataConvertion</name>
    <description>DataConvertion</description>
    <properties>
        <java.version>21</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.33</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

spring.application.name=DataConvertion
spring.datasource.db1.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.db1.jdbc-url=jdbc:mysql://localhost:3306/xqr?useUnicode=true&characterEncoding=utf8
spring.datasource.db1.username=root
spring.datasource.db1.password=root
spring.datasource.db2.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.db2.jdbc-url=jdbc:mysql://localhost:3306/mcms?useUnicode=true&characterEncoding=utf8
spring.datasource.db2.username=root
spring.datasource.db2.password=root

package zhang.dataconvertion.config;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import javax.sql.DataSource;
@Configuration//表名此类是是配置工具类，让springboot框架将此类当成配置文件加载
public class DatasourceConfig {
    //创建第一个数据源（数据库）
    @Bean//bean注解用来创建数据源,Bean注解几乎是方法专用。
    @Primary//表示该数据源为首选数据源.主要用于分清主次数据源
    @ConfigurationProperties(prefix ="spring.datasource.db1" )//ConfigurationProperties用来连接创建谁的数据源对象.读取配置文件的信息。
    public DataSource dbOne(){
        return DataSourceBuilder.create().build();
    }
    //创建第二个数据源（数据库）
    @Bean  //方法名就是对象名
    @ConfigurationProperties(prefix ="spring.datasource.db2")
    public DataSource dbTwo(){
        return DataSourceBuilder.create().build();
    }
}

package zhang.dataconvertion.config;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.jdbc.core.JdbcTemplate;
import javax.sql.DataSource;
//数据源具体怎么使用就依赖于这个类
//该类作用：给jdbcTemplate注入不同的数据源
@Configuration
public class JdbcTemplateConfig {
        @Bean
        public JdbcTemplate oneTemplate(@Qualifier("dbOne") DataSource dataSource){//@Qualifier("dbOne")指定第一个数据源。dbOne为数据源对应的方法名。不指定数据源，由于有两个，因此会报错
            return new JdbcTemplate(dataSource);
        }
        @Bean
        public JdbcTemplate twoTemplate(@Qualifier("dbTwo") DataSource dataSource){//@Qualifier("dbTwo")指定第二个数据源。dbTwo为数据源对应的方法名
            return new JdbcTemplate(dataSource);
        }
}

package zhang.dataconvertion;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.jdbc.core.BatchPreparedStatementSetter;
import org.springframework.jdbc.core.JdbcTemplate;
import java.sql.PreparedStatement;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;
@SpringBootApplication
public class DataConvertionApplication implements CommandLineRunner {
    @Autowired
    @Qualifier("oneTemplate")
    private JdbcTemplate oneTemplate;
    @Autowired
    @Qualifier("twoTemplate")
    private JdbcTemplate twoTemplate;
    public static void main(String[] args){
        SpringApplication.run(DataConvertionApplication.class, args);
    }
    @Override
    public void run(String... args) throws Exception {
        List<Map<String, Object>> maps1 = oneTemplate.queryForList("select * from story");
        for (Map<String, Object> map : maps1) {
            System.out.println(map);
        }
        List<Map<String, Object>> maps2 = twoTemplate.queryForList("select * from mdiy_dict");
        for (Map<String, Object> map : maps2) {
            System.out.println(map);
        }
    }
}