Idea建立SpringBoot項目(集成MyBatis + MySQL)

時間 2021-08-13

標籤 java mysql web spring sql 數據庫 apache segmentfault 瀏覽器服務器欄目 Eclipse 简体版

原文原文鏈接

新建工程

1.1 Create New Project

1.2 選擇 Spring Initializr 建立器和選擇SDK版本

1.3 填寫組織、項目名稱和Java版本信息等

1.4 選擇須要的依賴

1.5 填寫項目、選擇存儲路徑，而後點擊finish

至此，項目已建立好。java

配置訪問接口

2.1 新建 controller.HelloController 控制器文件mysql

@RestController
public class HelloController {

    @RequestMapping(value = "/hi", method = RequestMethod.GET)
    public String sayHello() {
        return "Hi buddy, How're you today ? ";
    }
}

2.2 修改應用主入口文件MessageSystemApplication，註解添加(exclude = DataSourceAutoConfiguration.class)使其不須要配置數據庫。最後以下web

@SpringBootApplication(exclude = DataSourceAutoConfiguration.class)
public class MessageSystemApplication {

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

}

2.3 啓動應用，而後在瀏覽器訪問：http://127.0.0.1:8080/hi，服務器相應並返回字符串，以下圖：
spring

配置阿里雲依賴庫地址

<repositories>
        <repository>
            <id>alimaven</id>
            <name>Maven Aliyun Mirror</name>
            <url>https://maven.aliyun.com/repository/public</url>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>

配置 MyBatis 應用

4.1 pom.xml 添加依賴和配置sql

<?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>2.2.5.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>cn.longmaster</groupId>
    <artifactId>message-system</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>message-system</name>
    <description>MessageSystemproject for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    </properties>

    <dependencies>

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

        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.1</version>
        </dependency>


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

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

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jdbc</artifactId>
        </dependency>


        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

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

        <resources>
            <resource>
                <directory>src/main/resources</directory>
            </resource>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>cn/longmaster/messagesystem/mapper/xml/*.xml</include>
                </includes>
            </resource>
        </resources>
    </build>

<!--    配置阿里倉庫-->
    <repositories>
        <repository>
            <id>alimaven</id>
            <name>Maven Aliyun Mirror</name>
            <url>https://maven.aliyun.com/repository/public</url>
            <releases>
                <enabled>true</enabled>
            </releases>
            <snapshots>
                <enabled>false</enabled>
            </snapshots>
        </repository>
    </repositories>

    <pluginRepositories>
        <pluginRepository>
            <id>spring-milestones</id>
            <name>Spring Milestones</name>
            <url>https://repo.spring.io/milestone</url>
        </pluginRepository>
    </pluginRepositories>

</project>

4.2 配置數據庫鏈接
在resources目錄下新建 application.yml 配置文件，並進行數據庫配置以下數據庫

spring:
  datasource:
    url: jdbc:mysql://127.0.0.1:3306/db_ms?useUnicode=true&amp&characterEncoding=utf-8&serverTimezone=UTC #注意設置編碼格式 #url
    username: root #用戶名
    password: longmaster #密碼
    driver-class-name: com.mysql.cj.jdbc.Driver #數據庫連接驅動

mybatis:
  mapper-locations: classpath:cn/longmaster/messagesystem/mapper/xml/*.xml # 注意:必定要對應mapper映射xml文件的所在路徑
  type-aliases-package: cn.longmaster.messagesystem.entity  # 注意:對應實體類的路徑

4.3 新建實體類 entity.Userapache

@Data
public class User {
    private int user_id;
    private String job_number;
    private String name;
    private String password;
    private Date birthday;
    private int use_state;
}

4.4 新建 mapper.UserMappersegmentfault

@Repository
public interface UserMapper {
    /**
     * 新增職工信息
     * @param user
     * @return
     */
    int addUser(@Param("user") User user);
}

4.5 新建 xml， mapper.xml.UserMapper.xml瀏覽器

<?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.longmaster.messagesystem.mapper.UserMapper">

    <insert id="addUser" >
        INSERT INTO t_user(job_number, name, password, birthday, use_state) VALUES
        (#{user.job_number}, #{user.name}, #{user.password}, #{user.birthday}, 1)
    </insert>

</mapper>

4.6 新建服務類 service.UserService服務器

@Service
public class UserService {
    @Autowired
    UserMapper userMapper;

    public String addUser(User user) {
        if (userMapper.addUser(user) > 0) {
            return "Add Success";
        } else {
            return "Add Fail";
        }
    }
}

4.7 控制器添加新增方法addUser:

@RestController
public class HelloController {

    @Autowired
    UserService userService;

    @RequestMapping(value = "/hi", method = RequestMethod.GET)
    public String sayHello() {
        return "Hi buddy, How're you today ? ";
    }

    @RequestMapping(value = "/addUser", method = RequestMethod.POST)
    public String addUser(@RequestBody User user) {
        return userService.addUser(user);
    }
}

4.8 應用入口類添加Mapper

@SpringBootApplication
@MapperScan("cn.longmaster.messagesystem.mapper")
public class MessageSystemApplication {

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

}

至此，全部的配置完成。啓動程序，經過POST發送添加請求，添加成功。以下圖

數據庫