springboot结合mybatis多套druid数据源入门级音乐网站后台

   这几天研究springboot和mybatis，正好手里边有个原来做过的javaweb项目，就直接拿过来整合了起来。这里前台用vue.js实现的代码就不分享了，前后端分离么，不影响看后边。想看整套源码可以到文章末尾去拿。

自动忽略那几个字。。。实在是想不起什么歌名了。。。

首先pom.xml

<dependencies>
    <dependency>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-webartifactId>
    dependency>


    
    <dependency>
        <groupId>org.mybatis.spring.bootgroupId>
        <artifactId>mybatis-spring-boot-starterartifactId>
        <version>1.3.2version>
    dependency>

    
    <dependency>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-devtoolsartifactId>
        <scope>runtimescope>
    dependency>
    <dependency>
        <groupId>org.projectlombokgroupId>
        <artifactId>lombokartifactId>

    dependency>

    
    <dependency>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-testartifactId>
        <scope>testscope>
    dependency>

    <dependency>
        <groupId>mysqlgroupId>
        <artifactId>mysql-connector-javaartifactId>
    dependency>

    
    <dependency>
        <groupId>com.alibabagroupId>
        <artifactId>druidartifactId>
        <version>1.1.9version>
    dependency>

    <dependency>
        <groupId>com.alibabagroupId>
        <artifactId>fastjsonartifactId>
        <version>1.2.15version>
    dependency>
dependencies>

项目结构图

有两个配置文件，也可以放到一起，当时因为整两套数据源老出错，就把它们分开了

这个config目录下的配置

server.port=8088
server.servlet.context-path=/music
spring.devtools.restart.enabled=true
spring.devtools.restart.additional-paths=src/main/java
spring.devtools.restart.additional-exclude=static

这是classpath：下的

musicweb.datasource.url=jdbc:mysql://localhost:3306/musicweb?useSSL=false&characterEncoding=utf8
musicweb.datasource.username=root
musicweb.datasource.password=leishao
musicweb.datasource.driverClassName=com.mysql.jdbc.Driver

musictop.datasource.url=jdbc:mysql://localhost:3306/musictop?useSSL=false&characterEncoding=utf8
musictop.datasource.username=root
musictop.datasource.password=leishao
musictop.datasource.driverClassName=com.mysql.jdbc.Driver

关于DataSource和SqlSessionFactory在config目录下

下边是musictop数据源和它的SqlSessionFactory配置类

@Configuration
public class MusictopDataSource {

    @Value("${musictop.datasource.url}")
    private String url;

    @Value("${musictop.datasource.username}")
    private String user;

    @Value("${musictop.datasource.password}")
    private String password;

    @Value("${musictop.datasource.driverClassName}")
    private String driverClass;


    @Bean(name="musictop")
    @Qualifier("musictop")
    public DataSource dataSource(){
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName(driverClass);
        dataSource.setUrl(url);
        dataSource.setUsername(user);
        dataSource.setPassword(password);
        return dataSource;
    }
    @Bean(name = "musictopTransactionManager")
    public DataSourceTransactionManager musictopTransactionManager() {
        return new DataSourceTransactionManager(dataSource());
    }

}

@Configuration
@MapperScan(basePackages = MusictopSessionFactory.PACKAGE,sqlSessionFactoryRef = "musictopSqlSessionFactory")
@ToString
public class MusictopSessionFactory {

    // 精确到 musictop 目录，以便跟其他数据源隔离
    static final String PACKAGE = "com.lei.music.dao.musictop";
    static final String MAPPER_LOCATION = "classpath:mapper/musictop/*.xml";



    @Bean(name = "musictopSqlSessionFactory")
    public SqlSessionFactory clusterSqlSessionFactory(@Qualifier("musictop") DataSource musictopDataSource)
            throws Exception {
        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(musictopDataSource);
        sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver()
                .getResources(MusictopSessionFactory.MAPPER_LOCATION));
        return sessionFactory.getObject();
    }
}

下边是musicweb的DataSource和SqlSeessionFactory的配置

@Configuration
public class MusicwebDataSource {

    @Value("${musicweb.datasource.url}")
    private String url;

    @Value("${musicweb.datasource.username}")
    private String user;

    @Value("${musicweb.datasource.password}")
    private String password;

    @Value("${musicweb.datasource.driverClassName}")
    private String driverClass;


    @Bean(name="musicweb")
    @Primary
    @Qualifier("musicweb")
    public DataSource dataSource(){
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setDriverClassName(driverClass);
        dataSource.setUrl(url);
        dataSource.setUsername(user);
        dataSource.setPassword(password);
        return dataSource;

    }
    @Bean(name = "musicwebTransactionManager")
    @Primary
    public DataSourceTransactionManager musictwebTransactionManager() {
        return new DataSourceTransactionManager(dataSource());
    }

}

@Configuration
//扫描Mapper接口并容器管理
@MapperScan(basePackages = MusicwebSessionFactory.PACKAGE,sqlSessionFactoryRef = "musicwebSqlSessionFactory")
@ToString
public class MusicwebSessionFactory {


    static final String PACKAGE = "com.lei.music.dao.musicweb";
    static final String MAPPER_LOCATION = "classpath:mapper/musicweb/*.xml";



    @Bean(name = "musicwebSqlSessionFactory")
    @Primary
    public SqlSessionFactory clusterSqlSessionFactory(@Qualifier("musicweb") DataSource musicwebDataSource)
            throws Exception {
        final SqlSessionFactoryBean sessionFactory = new SqlSessionFactoryBean();
        sessionFactory.setDataSource(musicwebDataSource);
        sessionFactory.setMapperLocations(new PathMatchingResourcePatternResolver()
                .getResources(MusicwebSessionFactory.MAPPER_LOCATION));
        return sessionFactory.getObject();
    }
}

接下来就是设置跨域请求

@Configuration
public class WebMvcConfig implements WebMvcConfigurer {


    //跨域请求

    @Override
    public void addCorsMappings(CorsRegistry registry) {
        //设置允许跨域的路径
        registry.addMapping("/**")
                //设置允许跨域请求的域名
                .allowedOrigins("*")
                //是否允许证书 不再默认开启
                .allowCredentials(true)
                //设置允许的方法
                .allowedMethods("GET", "POST", "DELETE", "PUT")
                //跨域允许的时间
                .maxAge(3600);
    }
}

到了这一步，基本的配置就完毕了。其实之后的代码基本就是，完成一个，复制粘贴，没什么难度。我这里就展示一下其中的一个实现。

首先。entity下有两个目录，分别对应两个数据库中的表。简单点先看看musicweb下的member类

@Data
public class memBer {
    private Integer id;
    private String username;
    private String name;
    private String pwd;
    private String email;
    private String tel;
    private String date;


}

之后到DAO的musicweb目录下看与member对应的UserDao

public interface UserDao {
    List queryMembers();
    int saveMember(memBer member);
    int updateMember(memBer member);
    int removeMember(Integer id);
}

完后再resource的mapper目录下建立与UserDao对应的UserMapper文件

xml version="1.0" encoding="UTF-8" ?>
 mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.lei.music.dao.musicweb.UserDao">
    <resultMap id="BaseResultMap" type="com.lei.music.entity.musicweb.memBer">
        <id column="id" property="id" jdbcType="BIGINT"/>
        <result column="username" property="username" jdbcType="VARCHAR"/>
        <result column="name" property="name" jdbcType="VARCHAR"/>
        <result column="pwd" property="pwd" jdbcType="VARCHAR"/>
        <result column="email" property="email" jdbcType="VARCHAR"/>
        <result column="tel" property="tel" jdbcType="VARCHAR"/>
        <result column="date" property="date" jdbcType="VARCHAR"/>
    resultMap>
    <sql id="Base_Column_List">
        id,username,name,pwd,email,tel,date
    sql>
    <select id="queryMembers" resultMap="BaseResultMap">
        select <include refid="Base_Column_List"/> from member
    select>

    <insert id="saveMember" useGeneratedKeys="true" keyProperty="id" keyColumn="id" parameterType="com.lei.music.entity.musicweb.memBer">
        insert  into member(username,name,pwd,email,tel,date) values (#{username},#{name},#{pwd},#{email},#{tel},#{date})
    insert>

    <delete id="removeMember" parameterType="Integer">
        delete from member where id=#{id}
    delete>

    <update id="updateMember" parameterType="com.lei.music.entity.musicweb.memBer">
        update member set username=#{username},name=#{name},pwd=#{pwd},email=#{email},tel=#{tel},date=#{date} where id=#{id}
    update>


mapper>

到这流程就差不多了。

源码地址：https://download.csdn.net/download/weixin_41228362/10503975