小白入门之 Springboot整合SSM

Posted 2021-07-21 cgblpx

文章目录

• • 1.1 创建SSM模块
  • • 1.1.1 系统架构图
    • 1.1.2 项目结构
    • 1.1.3 需求
    • 1.1.4 准备表，数据
    • 1.1.5 pom.xml
    • 1.1.6 Car.java
    • 1.1.7 CarDao接口
    • 1.1.8 CarMapper.xml
    • 1.1.9 CarService接口
    • 1.1.10 CarServiceImpl.java
    • 1.1.11 CarController.java
    • 1.1.12 application.yml
    • 1.1.13 RunApp.java
    • 1.1.14 测试
    • 新增需求:

1.1 创建SSM模块

1.1.1 系统架构图

1.1.2 项目结构

1.1.3 需求

访问:http://localhost:8080/car/get
返回:{"name":"BMW","color":"red","price":9.9}

1.1.4 准备表，数据

CREATE TABLE `car` (
  `id` int(11) NOT NULL auto_increment,
  `name` varchar(10) default NULL,
  `color` varchar(10) default NULL,
  `price` double default NULL,
  PRIMARY KEY  (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

1.1.5 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>springbootcgb2103</artifactId>
        <groupId>cn.tedu</groupId>
        <version>0.0.1-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>testSSM</artifactId>

    <dependencies>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.4</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.48</version>
            <scope>runtime</scope>
        </dependency>
    </dependencies>

</project>

1.1.6 Car.java

package cn.tedu.pojo;

import org.springframework.stereotype.Component;

@Component
public class Car {
    private int id;
    private String name;
    private String color;
    private double price;

    public int getId() {
        return id;
    }

    @Override
    public String toString() {
        return "Car{" +
                "id=" + id +
                ", name='" + name + '\\'' +
                ", color='" + color + '\\'' +
                ", price=" + price +
                '}';
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getColor() {
        return color;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

}

1.1.7 CarDao接口

package cn.tedu.dao;

import cn.tedu.pojo.Car;
import org.springframework.stereotype.Repository;

public interface CarDao {
    Car get();
}

1.1.8 CarMapper.xml

<?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="cn.tedu.dao.CarDao">
    <select id="get" resultType="cn.tedu.pojo.Car">
        select * from car where price=9.9
    </select>
</mapper>

1.1.9 CarService接口

package cn.tedu.service;

import cn.tedu.pojo.Car;

public interface CarService {
    Car get() ;
}

1.1.10 CarServiceImpl.java

package cn.tedu.service;

import cn.tedu.dao.CarDao;
import cn.tedu.pojo.Car;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CarServiceImpl implements CarService{

    @Autowired
    private CarDao carDao;

    @Override
    public Car get() {
        return carDao.get();
    }
}

1.1.11 CarController.java

package cn.tedu.controller;

import cn.tedu.pojo.Car;
import cn.tedu.service.CarService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/car/")
public class CarController {

    @Autowired
    private CarService carService;

    @RequestMapping("get")
    public Car get(){
        return carService.get();
    }
}

1.1.12 application.yml

#SpringBoot配置mysql信息
spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url: jdbc:mysql:///mybatisdb?useUnicode=true&characterEncoding=utf8&useSSL=false
    username: root
    password: root
#SpringBoot整合Mybatis配置
mybatis:
  #指定UserMapper.xml文件的位置
  mapper-locations: classpath:*.xml
  #开启驼峰映射
  configuration:
    map-underscore-to-camel-case: true

1.1.13 RunApp.java

package cn.tedu;

import org.mybatis.spring.annotation.MapperScan;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
@MapperScan("cn.tedu.dao")//扫描DAO接口文件所在的包
public class Runapp {
    public static void main(String[] args) {
        SpringApplication.run(Runapp.class);
    }
}

1.1.14 测试

访问:http://localhost:8080/car/get
返回:{"name":"BMW","color":"red","price":9.9}

新增需求:

访问:http://localhost:8080/car/getById?id=2
返回: {"id":2,"name":"Audi","color":"black","price":0.3}