SpringBoot快速上手——《二》：SpringBoot集成SSM，实现增删改查功能
Posted
tags:
篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了SpringBoot快速上手——《二》：SpringBoot集成SSM，实现增删改查功能相关的知识，希望对你有一定的参考价值。
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。
<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"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>2.2.2.RELEASE</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>xyz.java1024</groupId> <artifactId>springboot-ssm</artifactId> <version>1.0-SNAPSHOT</version>
<name>springboot-ssm</name>
<!-- FIXME change it to the project‘s website -->
<url>http://www.example.com</url>;
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</dependency></dependencies>
</project>
> 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<!-- mysql mybatis -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.13</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.1.18</version>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>1.3.2</version>
</dependency>
### 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<User> 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<?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="xyz.java1024.mapper.UserMapper">
<resultMap id="BaseResultMap" type="xyz.java1024.vo.User">br/><!--@mbg.generated-->
<id column="id" jdbcType="INTEGER" property="id" />
<result column="username" jdbcType="VARCHAR" property="username" />
<result column="tel" jdbcType="VARCHAR" property="tel" />
<result column="password" jdbcType="VARCHAR" property="password" />
<result column="status" jdbcType="TINYINT" property="status" />
<result column="created_at" jdbcType="TIMESTAMP" property="createdAt" />
<result column="updated_at" jdbcType="TIMESTAMP" property="updatedAt" />
</resultMap>
<sql id="Base_Column_List">br/><!--@mbg.generated-->
id, username, tel, password, status, created_at, updated_at
</sql>
<select id="selectByPrimaryKey" parameterType="java.lang.Integer" resultMap="BaseResultMap">br/><!--@mbg.generated-->
select
<include refid="Base_Column_List" />
from user
where id = #{id,jdbcType=INTEGER}
</select>
<delete id="deleteByPrimaryKey" parameterType="java.lang.Integer">br/><!--@mbg.generated-->
delete from user
where id = #{id,jdbcType=INTEGER}
</delete>
<insert id="insert" keyColumn="id" keyProperty="id" parameterType="xyz.java1024.vo.User" useGeneratedKeys="true">br/><!--@mbg.generated-->
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}
)
</insert>
<update id="updateByPrimaryKey" parameterType="xyz.java1024.vo.User">br/><!--@mbg.generated-->
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}
</update>
<select id="list" resultMap="BaseResultMap" >
select
<include refid="Base_Column_List" />
from user
</select>
### 5.扫描mapper接口，即在启动类加@MapperScan注解@SpringBootApplicationbr/>@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@RestControllerbr/>@RequestMapping("/user")
public class UserController {
@Autowired
private UserMapper userMapper;
@RequestMapping("/listByUser")
public List<User> listByUser() {
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文件以上是关于SpringBoot快速上手——《二》：SpringBoot集成SSM，实现增删改查功能的主要内容，如果未能解决你的问题，请参考以下文章
SpringBoot快速上手——《一》：初始SpringBoot，实现入门级程序
SpringBoot快速上手——《一》：初始SpringBoot，实现入门级程序