springboot学习-1

最终目录结构：

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 https://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>2.7.13</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com</groupId>
    <artifactId>study</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>study</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>

        <!--mysql 连接驱动-->
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.17</version>
        </dependency>

        <!-- 德鲁伊数据源 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.6</version>
        </dependency>

        <!--mybatis-->
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.1</version>
        </dependency>

        <!-- mybatis-generator-->
        <dependency>
            <groupId>org.mybatis.generator</groupId>
            <artifactId>mybatis-generator-core</artifactId>
            <version>1.4.0</version>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>

            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.4.0</version>

                <dependencies>
                    <dependency>
                        <groupId>mysql</groupId>
                        <artifactId>mysql-connector-java</artifactId>
                        <version>8.0.17</version>
                    </dependency>
                </dependencies>
                
                <configuration>
                    <verbose>true</verbose>
                    <overwrite>true</overwrite>
                    <!-- mybatis-generator.xml 路径 -->
                    <configurationFile>${basedir}/src/main/resources/mybatis-generator.xml</configurationFile>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

主启动类

package com.study;

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

@SpringBootApplication
@MapperScan("com.study.dao") // 自动注册 dao 类
public class StudyApplication {

    public static void main(String[] args) {
        SpringApplication.run(StudyApplication.class, args);
    }

}

RequestMapping 与请求参数接收

get 请求用 @RequestParam， post 请求用 @RequestBody

package com.study.controller;

import java.util.Map;

import com.study.dao.RecordCatalogDOMapper;
import com.study.pojo.RecordCatalogDO;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import com.study.utils.JsonResult;

import lombok.extern.slf4j.Slf4j;

@RestController
@RequestMapping("stu")
@Slf4j
public class StuController {

    @Autowired // 自动装配
    private RecordCatalogDOMapper recordCatalogDOMapper;

    @GetMapping("{stuId}/get")
    /*
     * @RequestParam 当前后端参数一致可以省略
     * api: http://localhost:8081/stu/54/get?name=wang
     */
    public JsonResult getStu(@PathVariable("stuId") String id,
                             @RequestParam String name) {
        log.info("stuId=" + id); // stuId=54
        log.info("name=" + name); // name=wang

        RecordCatalogDO recordCatalogDO = recordCatalogDOMapper.selectByPrimaryKey(1L);
        return JsonResult.ok(recordCatalogDO);
    }

    @PostMapping("create")
    public JsonResult createStu(@RequestBody Map<String, Object> map) {
        log.info("map=" + map.toString()); // map={catalog=吃饭, name=wang}
        return JsonResult.ok(map);
    }
}

yml 配置

server:
  port: 8081

spring:
  datasource:
    name: backend
    url: jdbc:mysql://127.0.0.1:3306/backend # 数据库
    username: root
    password: 12345678
    type: com.alibaba.druid.pool.DruidDataSource # 连接池
    driverClassName: com.mysql.cj.jdbc.Driver

mybatis:
  mapperLocations: classpath:mapping/* # map 映射文件，位于resources的哪个位置

mybatis-generator.xml

提前建好文件夹

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">

<generatorConfiguration>

    <!-- context 是逆向工程的主要配置信息 -->
    <!-- id：起个名字 -->
    <!-- targetRuntime：设置生成的文件适用于那个 mybatis 版本 -->
    <context id="default" targetRuntime="MyBatis3">


        <!--jdbc的数据库连接-->
        <!--jdbc:mysql://localhost:3306/数据库名?useUnicode=true&characterEncoding=UTF-8&serverTimezone=UTC-->
        <jdbcConnection driverClass="com.mysql.cj.jdbc.Driver"
                        connectionURL="jdbc:mysql://127.0.0.1:3306/backend?serverTimezone=UTC"
                        userId="root"
                        password="12345678">
        </jdbcConnection>

        <!-- targetPackage：生成的实体类所在的包路径 -->
        <!-- targetProject：生成的实体类所在的硬盘位置 -->
        <!-- DataObject 类存放位置 -->
        <javaModelGenerator targetPackage="com.study.pojo"
                            targetProject="src/main/java">
            <!-- 是否允许子包 -->
            <property name="enableSubPackages" value="false"/>
            <!-- 是否对modal添加构造函数 -->
            <property name="constructorBased" value="true"/>
            <!-- 是否清理从数据库中查询出的字符串左右两边的空白字符 -->
            <property name="trimStrings" value="true"/>
            <!-- 建立modal对象是否不可改变 即生成的modal对象不会有setter方法，只有构造方法 -->
            <property name="immutable" value="false"/>
        </javaModelGenerator>

        <!-- targetPackage 和 targetProject：生成的 mapper 文件的包和位置 -->
        <sqlMapGenerator targetPackage="mapping"
                         targetProject="src/main/resources">
            <!-- 针对数据库的一个配置，是否把 schema 作为字包名 -->
            <property name="enableSubPackages" value="false"/>
        </sqlMapGenerator>

        <!-- targetPackage 和 targetProject：生成的 interface 文件的包和位置 -->
        <javaClientGenerator type="XMLMAPPER"
                             targetPackage="com.study.dao" targetProject="src/main/java">
            <!-- 针对 oracle 数据库的一个配置，是否把 schema 作为字包名 -->
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>

        <!--生成对应表及类名-->
        <table tableName="record_catalog" domainObjectName="RecordCatalogDO">
        </table>
    </context>
</generatorConfiguration>