主要的依赖包：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<!--实现web页面接口调用-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
application.yml用于连接jdbc数据库操作数据源配置，这里是最简化的配置：
spring:
datasource:
username: root
password: admin
#假如时区报错，增加时区配置serverTimezone=UTC，以及编码配置
url: jdbc:mysql://localhost:3306/mybatis02_0322?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
driver-class-name: com.mysql.cj.jdbc.Driver
实际开发过程中基本上会与Druid、C3P0整合，下面也给出了整合Druid数据源相关的配置，所以这里一并放上完整的application.yml配置：
spring:
datasource:
username: root
password: admin
#假如时区报错，增加时区配置serverTimezone=UTC
url: jdbc:mysql://localhost:3306/mybatis02_0322?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8
driver-class-name: com.mysql.cj.jdbc.Driver
type: com.alibaba.druid.pool.DruidDataSource
#springboot 默认是不注入这些属性值的，需要自己绑定
#druid 数据源专有配置
initialSize: 5
minIdle: 5
maxActive: 20
maxWait: 60000
timeBetweenEvictionRunsMillis: 60000
minEvictableIdleTimeMillis: 300000
validationQuery: SELECT 1 FROM DUAL
testWhileIdle: true
testOnBorrow: false
testOnReturn: false
poolPreparedStatements: true
#配置监控统计拦截的filters，stat：监控统计、log4j：日志记录、wall：防止sql注入
#如果允许时报错：java.lang.ClassNotFoundException:org.apache.log4j.Priority
#则导入 log4j 依赖即可，maven地址：https://mvnrepository.com/artifact/log4j/log4j
filters: stat,wall,log4j
maxPoolPreparedStatementPerConnectionSize: 20
useGlobalDataSourceStat: true
connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500
最后测试一下数据库连接访问是否成功：
@SpringBootTest
class SpringbootDataApplicationTests {
@Autowired
private DataSource dataSource;
@Test
void testConnection() throws SQLException {
System.out.println(dataSource.getClass());
Connection connection = dataSource.getConnection();
System.out.println(connection);
}
}
打印成功，显示获取到了数据源信息：
1.3.界面访问接口测试
@RestController
public class JDBCController {
@Autowired
private JdbcTemplate jdbcTemplate;
@RequestMapping("/queryList")
public List<Map<String, Object>> query() {
String sql = "select * from user";
List<Map<String, Object>> queryForList = jdbcTemplate.queryForList(sql);
return queryForList;
}
@RequestMapping("/addUser")
public String AddUser(){
String sql = "insert into mybatis02_0322.user(id, username, password) values(4, '李磊', '654321')";
int update = jdbcTemplate.update(sql);
return "AddUser Ok";
}
@RequestMapping("/update/{id}")
public String update(@PathVariable("id") Integer id){
String sql = "update mybatis02_0322.user set username = ?, password = ? where id = " + id;
Object[] objects = new Object[2];
objects[0] = "测试哈哈哈111";
objects[1] = "32321";
int update = jdbcTemplate.update(sql, objects);
return "updateUser Ok";
}
@RequestMapping("/delete/{id}")
public String delete(@PathVariable("id") Integer id){
String sql = "delete from mybatis02_0322.user where id = " + id;
int update = jdbcTemplate.update(sql);
return "delete Ok";
}
}
这里对应接口请求页面进行请求测试即可，后台数据库层面进行验证，比较简单，这里就不一一细说，对应可以去看我的源码。
Druid是阿里巴巴开源平台上一个数据库连接池实现，它结合了C3P0、DBCP、PROXOOL等DB池的优秀实践，同时加入了日志监控。
Druid可以很好地监控DB池连接和Sql的执行情况，是天生针对监控的DB连接池。
SpringBoot2.0以上默认使用Hikari数据源，可以说HiKari和Druid都是当前Java Web上开源的优秀数据源。
对应pom.xml文件：
<!--整合alibaba druid数据源-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.2.3</version>
</dependency>
<!--导入log4j日志包-->
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
2.3.配置Druid并使用监控页面
①编写DruidConfig类，启用后台监控功能Bean以及过滤器Bean：
@Configuration
public class DruidConfig {
@ConfigurationProperties(prefix = "spring.datasource")
@Bean
public DataSource druidDataSource(){
return new DruidDataSource();
}
//后台监控功能
@Bean
public ServletRegistrationBean statViewServlet(){
ServletRegistrationBean<StatViewServlet> bean = new ServletRegistrationBean<>(new StatViewServlet(), "/druid/*");
//后台需要有人登陆，账号密码配置
HashMap<String, String> initParameters = new HashMap<>();
initParameters.put("loginUsername", "admin"); //登陆key，是固定的 loginUsername loginPassword
initParameters.put("loginPassword", "123456");
//允许谁可以访问
initParameters.put("allow", "");
//禁止谁可以访问 initParameters.put("fengye", "192.168.1.10");
bean.setInitParameters(initParameters); //设置初始化参数
return bean;
}
//过滤器
@Bean
public FilterRegistrationBean webStatFilter(){
FilterRegistrationBean<Filter> bean = new FilterRegistrationBean<>();
bean.setFilter(new WebStatFilter());
HashMap<String, String> initParameters = new HashMap<>();
//这些不进行统计
initParameters.put("exclusions", "*.js,*.css,/druid/*");
bean.setInitParameters(initParameters);
return bean;
}
}
②启动页面访问Druid并测试请求访问sql：
本博客写作参考文档相关：
https://docs.spring.io/spring-boot/docs/current/reference/htmlsingle/#using-boot-starter
https://www.yuque.com/atguigu/springboot/aob431#wtNk1
Spring Boot 2 学习笔记（上）：https://blog.csdn.net/u011863024/article/details/113667634
Spring Boot 2 学习笔记（下）：
https://blog.csdn.net/u011863024/article/details/113667946
示例代码已上传至Github地址：
https://github.com/devyf/SpringBoot_Study
