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创建程序引入依赖启动类配置文件编写编写 Controller启动测试问题解决
4.1 创建程序
4.2 引入依赖
?xml version1.0 encodingUTF-8?
project xmlnshttp://maven.apache.org/POM/4.0.0xmlns:xsihttp://ww…本章概要
创建程序引入依赖启动类配置文件编写编写 Controller启动测试问题解决
4.1 创建程序
4.2 引入依赖
?xml version1.0 encodingUTF-8?
project xmlnshttp://maven.apache.org/POM/4.0.0xmlns:xsihttp://www.w3.org/2001/XMLSchema-instancexsi:schemaLocationhttp://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsdmodelVersion4.0.0/modelVersionparentgroupIdorg.springframework.boot/groupIdartifactIdspring-boot-starter-parent/artifactIdversion3.0.5/version/parentgroupIdcom.atguigu/groupIdartifactIdspringboot-starter-druid-04/artifactIdversion1.0-SNAPSHOT/versionpropertiesmaven.compiler.source17/maven.compiler.sourcemaven.compiler.target17/maven.compiler.targetproject.build.sourceEncodingUTF-8/project.build.sourceEncoding/propertiesdependencies!-- web开发的场景启动器 --dependencygroupIdorg.springframework.boot/groupIdartifactIdspring-boot-starter-web/artifactId/dependency!-- 数据库相关配置启动器 jdbctemplate 事务相关--dependencygroupIdorg.springframework.boot/groupIdartifactIdspring-boot-starter-jdbc/artifactId/dependency!-- druid启动器的依赖 --dependencygroupIdcom.alibaba/groupIdartifactIddruid-spring-boot-3-starter/artifactIdversion1.2.18/version/dependency!-- 驱动类--dependencygroupIdmysql/groupIdartifactIdmysql-connector-java/artifactIdversion8.0.28/version/dependencydependencygroupIdorg.projectlombok/groupIdartifactIdlombok/artifactIdversion1.18.28/version/dependency/dependencies!-- SpringBoot应用打包插件--buildpluginsplugingroupIdorg.springframework.boot/groupIdartifactIdspring-boot-maven-plugin/artifactId/plugin/plugins/build/project4.3 启动类
SpringBootApplication
public class MainApplication {public static void main(String[] args) {SpringApplication.run(MainApplication.class,args);}
}4.4 配置文件编写 添加druid连接池的基本配置 spring:datasource:# 连接池类型 type: com.alibaba.druid.pool.DruidDataSource# Druid的其他属性配置 springboot3整合情况下,数据库连接信息必须在Druid属性下!druid:url: jdbc:mysql://localhost:3306/day01username: rootpassword: rootdriver-class-name: com.mysql.cj.jdbc.Driver# 初始化时建立物理连接的个数initial-size: 5# 连接池的最小空闲数量min-idle: 5# 连接池最大连接数量max-active: 20# 获取连接时最大等待时间单位毫秒max-wait: 60000# 申请连接的时候检测如果空闲时间大于timeBetweenEvictionRunsMillis执行validationQuery检测连接是否有效。test-while-idle: true# 既作为检测的间隔时间又作为testWhileIdel执行的依据time-between-eviction-runs-millis: 60000# 销毁线程时检测当前连接的最后活动时间和当前时间差大于该值时关闭当前连接(配置连接在池中的最小生存时间)min-evictable-idle-time-millis: 30000# 用来检测数据库连接是否有效的sql 必须是一个查询语句(oracle中为 select 1 from dual)validation-query: select 1# 申请连接时会执行validationQuery检测连接是否有效,开启会降低性能,默认为truetest-on-borrow: false# 归还连接时会执行validationQuery检测连接是否有效,开启会降低性能,默认为truetest-on-return: false# 是否缓存preparedStatement, 也就是PSCache,PSCache对支持游标的数据库性能提升巨大比如说oracle,在mysql下建议关闭。pool-prepared-statements: false# 要启用PSCache必须配置大于0当大于0时poolPreparedStatements自动触发修改为true。在Druid中不会存在Oracle下PSCache占用内存过多的问题可以把这个数值配置大一些比如说100max-pool-prepared-statement-per-connection-size: -1# 合并多个DruidDataSource的监控数据use-global-data-source-stat: truelogging:level:root: debug4.5 编写 Controller
Slf4j
Controller
RequestMapping(/user)
public class UserController {Autowiredprivate JdbcTemplate jdbcTemplate;GetMapping(/getUser)ResponseBodypublic User getUser(){String sql select * from users where id ? ; ;User user jdbcTemplate.queryForObject(sql, new BeanPropertyRowMapper(User.class), 1);log.info(查询的user数据为:{},user.toString());return user;}}4.6 启动测试
4.7 问题解决 通过源码分析druid-spring-boot-3-starter版本是1.2.18虽然适配了SpringBoot3但缺少自动装配的配置文件需要手动在resources目录下创建META-INF/spring/org.springframework.boot.autoconfigure.AutoConfiguration.imports文件内容如下 com.alibaba.druid.spring.boot3.autoconfigure.DruidDataSourceAutoConfigure
