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SpringBoot快速上手——《二》:SpringBoot集成SSM,实现增删改查功能

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SpringBoot集成SSM,实现增删改查功能

github源码:https://github.com/xivinChen/SpringBoot

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

技术图片

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有时会需要点击 自动导入
技术图片

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。
技术图片

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。

![创建配置](https://img-blog.csdnimg.cn/2019121817494781.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTI1NDI1Mg==,size_16,color_FFFFFF,t_70)

![application.yml配置](https://img-blog.csdnimg.cn/20191218175010580.png)

> 细心的同学可以发现 resources 图标没有 黄色的横线

![小问题解决](https://img-blog.csdnimg.cn/20191218175031301.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTI1NDI1Mg==,size_16,color_FFFFFF,t_70)

> 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

![选定配置](https://img-blog.csdnimg.cn/20191218175059719.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTI1NDI1Mg==,size_16,color_FFFFFF,t_70)

![选择配置路径](https://img-blog.csdnimg.cn/20191218175130973.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTI1NDI1Mg==,size_16,color_FFFFFF,t_70)
![选择好了](https://img-blog.csdnimg.cn/20191218175156283.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTI1NDI1Mg==,size_16,color_FFFFFF,t_70)

> 同时可见 yml后缀的配置文件的图标也发生了改变
![完美选中](https://img-blog.csdnimg.cn/20191218175220371.png)

>  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。

![自动成功](https://img-blog.csdnimg.cn/20191218175248529.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTI1NDI1Mg==,size_16,color_FFFFFF,t_70)

## 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
![测试结果](https://img-blog.csdnimg.cn/20191218180946266.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTI1NDI1Mg==,size_16,color_FFFFFF,t_70)

## 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

SpringBoot快速上手——《二》:SpringBoot集成SSM,实现增删改查功能

标签:uil   输入   pool   created   name   进入   generate   chm   url   

原文地址:https://blog.51cto.com/12219995/2465140

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