Spring Boot对jdbc支持的示例分析

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项目结构

pom.xml

pom.xml：

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">     <parent>         <artifactId>spring-boot-02</artifactId>         <groupId>com.keafmd</groupId>         <version>1.0-SNAPSHOT</version>     </parent>     <modelVersion>4.0.0</modelVersion>     <artifactId>spring-boot-08</artifactId>     <dependencies>         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-web</artifactId>         </dependency>         <!-- 解析jsp类库  -->         <dependency>             <groupId>org.apache.tomcat.embed</groupId>             <artifactId>tomcat-embed-jasper</artifactId>         </dependency>         <dependency>             <groupId>jstl</groupId>             <artifactId>jstl</artifactId>             <version>1.2</version>         </dependency>         <!-- JDBC-启动器, 默认的数据源 HikariCP -->         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-jdbc</artifactId>         </dependency>         <!-- JDBC-启动器, 默认的数据源 HikariCP -->         <dependency>             <groupId>mysql</groupId>             <artifactId>mysql-connector-java</artifactId>             <version>5.1.46</version>         </dependency>         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-starter-test</artifactId>         </dependency>         <dependency>             <groupId>org.springframework.boot</groupId>             <artifactId>spring-boot-devtools</artifactId>         </dependency>     </dependencies> </project>

application.yml

server:   port: 80 spring:   datasource:     url: jdbc:mysql://127.0.0.1:3306/ssm-java1?useSSL=false     driver-class-name: com.mysql.jdbc.Driver     username: root     password: 18044229

启动类

package com.keafmd;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;/** * Keafmd * * @ClassName: App08 * @Description: * @author: 牛哄哄的柯南 * @Date: 2021-04-08 11:48 * @Blog: https://keafmd.blog.csdn.net/ */@SpringBootApplicationpublic class App08 {    public static void main(String[] args) {        SpringApplication.run(App08.class, args);    }}

Dao层

UserDao：

package com.keafmd; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; /**  * Keafmd  *  * @ClassName: App08  * @Description:  * @author: 牛哄哄的柯南  * @Date: 2021-04-08 11:48  * @Blog: https://keafmd.blog.csdn.net/  */ @SpringBootApplication public class App08 {     public static void main(String[] args) {         SpringApplication.run(App08.class, args);     } }

Service层

IUserService ：

package com.keafmd.service; import java.util.List; /**  * Keafmd  *  * @ClassName: IUserService  * @Description:  * @author: 牛哄哄的柯南  * @Date: 2021-04-08 11:59  * @Blog: https://keafmd.blog.csdn.net/  */ public interface IUserService {     List list(); }

UserServiceImpl：

package com.keafmd.service.impl; import com.keafmd.dao.UserDao; import com.keafmd.service.IUserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import java.util.List; /**  * Keafmd  *  * @ClassName: UserServiceImpl  * @Description:  * @author: 牛哄哄的柯南  * @Date: 2021-04-08 12:00  * @Blog: https://keafmd.blog.csdn.net/  */ @Service public class UserServiceImpl implements IUserService {     @Autowired     UserDao userDao;     @Override     public List list() {         return userDao.userList();     } }

Controller层

UserController：

package com.keafmd.controller; import com.keafmd.service.IUserService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import java.util.List; /**  * Keafmd  *  * @ClassName: UserController  * @Description:  * @author: 牛哄哄的柯南  * @Date: 2021-04-08 18:04  * @Blog: https://keafmd.blog.csdn.net/  */ @RestController public class UserController {     @Autowired     IUserService userService;     /**      * http://127.0.0.1/userlist      * @return      */     @RequestMapping("userlist")     List UserList(){         return userService.list();     } }

测试类测试

UserDaoTest：

package com.keafmd.dao; import com.keafmd.App08; import org.junit.jupiter.api.Test; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest; import java.util.List; import static org.junit.jupiter.api.Assertions.*; @SpringBootTest(classes = App08.class) class UserDaoTest {     @Autowired     UserDao userDao;     @Test     public void test(){         List userlist = userDao.userList();         for (Object o : userlist) {             System.out.println(o);         }     } }

运行test方法的效果：

运行启动类，测试效果

运行启动类，访问：http://127.0.0.1/userlist

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