springboot框架搭建
1)访问springboot官网，填好相关信息后，点击左下角generate,生成springboot项目文件,然后直接用idea直接打开该项目，构建好springboot框架就搭建好了。
2)在pom.xml文件里添加Mybatis的起步依赖、数据库驱动坐标
<!-- mybatis依赖-->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>2.2.0</version>
</dependency>
<!-- 数据库驱动坐标-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.20</version>
</dependency>
3)在application.properties中添加数据库连接信息
server.server.port=8085
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test?userUnicode=true&characterEncoding=utf8&serverTimezone=GMT%2B8
spring.datasource.username=root
spring.datasource.password=123456
4)在mysql数据库创建user表
CREATE TABLE testuser (id int(11) NOT NULL COMMENT ‘id‘,name varchar(255) DEFAULT NULL COMMENT ‘姓名‘,age int(11) DEFAULT NULL COMMENT ‘年龄‘,password varchar(255) NOT NULL COMMENT ‘密码‘,
PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
创建实体Bean
package com.test.demo.bean;
import lombok.Data;
@Data
public class User {
private int id;
private String name;
private int age;
private String password;
}
5)编写Mapper
注意：@Mapper标记该类是一个mybatis的mapper接口，可以被spring boot自动扫描到spring上下文中
//注意：@Mapper标记该类是一个mybatis的mapper接口，可以被spring boot自动扫描到spring上下文中
@Mapper
public interface UserMapper {
public List<User> queryUserList();
}
6)配置Mapper映射文件
<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
<mapper namespace="com.test.demo.mapper.UserMapper">
<select id="queryUserList" resultType="com.test.demo.bean.User">
select * from user
</select>
</mapper>
7)在application.properties中添加mybatis的信息
#添加mybatis的信息**
mybatis.type-aliases-package=com.test.demo.bean
mybatis.mapper-locations=classpath:mapper/*.xml
8)编写测试Controller
注解需要在pom.xml里安装依赖
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.8</version>
<type>jar</type>
<scope>compile</scope>
</dependency>
package com.test.demo.controller;
import com.test.demo.bean.User;
import com.test.demo.mapper.UserMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import java.util.List;
//@RestController相当于 Controller+ResponseBody
@RestController
public class UserController {
@Autowired
private UserMapper userMapper;
//在本地服务器*问方法 http://localhost:8080/queryUser
@RequestMapping("/queryUser")
public List<User> queryUser(){
List<User> userList = userMapper.queryUserList();
return userList;
}
}
9)测试：启动spring boot
访问：http://localhost:8080/queryUser
转载：https://cloud.tencent.com/developer/article/1647670?from=article.detail.1647624