SpringBoot集成SSM,实现增删改查功能
一.先介绍创建模块的另一种方式
1.点击Maven -> 勾选Create from archetype -> 选择 maven-archetype-quickstart
有时会需要点击 自动导入
2.工程目录
可以看到,这样创建的模块是相对干净的,需要我们手动的编写程序启动入口类、需要配置时还得创建配置文件。下一步见证。
3.完善模块
添加依赖,这种脚架添加模块不会自动引入相关依赖。这里主要引入父级版本号和spring-boot-starter依赖。
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
修改启动类,添加注解和修改main启动方法
@SpringBootApplication
public class App
{
public static void main( String[] args )
{
SpringApplication.run(App.class,args);
}
}
添加配置文件,先添加resouces文件夹,在创建application.yml配置文件。
细心的同学可以发现 resources 图标没有 黄色的横线
点击上图,进入如图,选择Modules -> 选中模块, 接着选中resources再点击Mark as 中 带黄色横线的Resources即可,点击ok
同时可见 yml后缀的配置文件的图标也发生了改变
下面我们开始配置文件,yml 提供更加简洁的编程方式,可读性也极高。如下,配置端口号 和 应用名称。
server:
port: 8090
spring:
application:
name: springboot-ssm
4 改造完成,启动入口类查看效果。
二.SpringBoot 集成SSM
1.引入依赖 connector,druid,mybatis
2.创建数据库 表
CREATE TABLE user(
id int (11) NOT NULL AUTO_INCREMENT,
username varchar(64) NOT NULL,
tel VARCHAR(16) NOT NULL,
password VARCHAR(250) NOT NULL,
status TINYINT NOT NULL default 1,
created_at timestamp not null default CURRENT_TIMESTAMP ,
updated_at timestamp not null default CURRENT_TIMESTAMP ,
PRIMARY KEY (id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
package xyz.java1024.vo;
import java.io.Serializable;
import java.sql.Timestamp;
public class User implements Serializable {
private int id;
private String username;
private String tel;
private String password;
private int status;
private Timestamp createdAt;
private Timestamp updatedAt;
//get set省略
3.配置
server:
port: 8090
# 扫描mapper.xml文件
mybatis:
mapper-locations:
- classpath:mapping/*.xml
spring:
application:
name: springboot-ssm
datasource:
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://127.0.0.1:3306/springboot?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf-8&useSSL=false
username: root
password: 123zxc
3.mapper接口,在mapper包下创建UserMapper接口
package xyz.java1024.mapper;
import xyz.java1024.vo.User;
import java.util.List;
public interface UserMapper {
int deleteByPrimaryKey(Integer id);
int insert(User record);
User selectByPrimaryKey(Integer id);
User selectByUsername(String username);
int updateByPrimaryKey(User record);
List
}
4.在resources文件夹下创建mapping目录用来存放mapper.xml文件,创建UserMapper.xml文件
id, username, tel, `password`, `status`, created_at, updated_at
select
from user
where id = #{id,jdbcType=INTEGER}
delete from user
where id = #{id,jdbcType=INTEGER}
insert into user (username, tel, `password`,
`status`, created_at, updated_at
)
values (#{username,jdbcType=VARCHAR}, #{tel,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR},
#{status,jdbcType=TINYINT}, #{createdAt,jdbcType=TIMESTAMP}, #{updatedAt,jdbcType=TIMESTAMP}
)
update user
set username = #{username,jdbcType=VARCHAR},
tel = #{tel,jdbcType=VARCHAR},
`password` = #{password,jdbcType=VARCHAR},
`status` = #{status,jdbcType=TINYINT},
created_at = #{createdAt,jdbcType=TIMESTAMP},
updated_at = #{updatedAt,jdbcType=TIMESTAMP}
where id = #{id,jdbcType=INTEGER}
select
from user
5.扫描mapper接口,即在启动类加@MapperScan注解
@SpringBootApplication
@MapperScan("xyz.java1024.mapper")
public class App
{
public static void main( String[] args )
{
SpringApplication.run(App.class,args);
}
}
6.编写UserController,省略service
@RestController
@RequestMapping("/user")
public class UserController {
@Autowired
private UserMapper userMapper;
@RequestMapping("/listByUser")
public List
return userMapper.list();
}
@RequestMapping("/getOneUser")
public User getOneUser(int id) {
return userMapper.selectByPrimaryKey(id);
}
@RequestMapping("/addUser")
public int addUser(User user) {
return userMapper.insert(user);
}
@RequestMapping("/deleteUser")
public int deleteUser(int id) {
return userMapper.deleteByPrimaryKey(id);
}
}
7.启动工程测试,浏览器输入localhost:8090/user/getOneUser?id=1
四.总结
体验完SpringBoot 的SSM后,比Spring下的SSM的确是方便的太多,不仅省去了复杂的各种依赖,在配置方面也极大的得到简化,这也是SpringBoot精妙之处。
注意:@MapperScan("")是扫描mapper接口,而
mybatis:
mapper-locations:
- classpath:mapping/*.xml
是配置mapper.xml文件