1、使用IDEA新建一個空的maven專案

2、整個工程目錄如下圖所示：

3、其中DemoApplocation.java為系統啟動類，具體程式碼如下：

package com.cjs.example

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

@SpringBootApplication
@MapperScan("com.cjs.example.dao"
 
)
public class DemoApplication {
    public static void main(String[] args){
        SpringApplication.run(DemoApplication.class, args);
    }
}

4、HelloController.java程式碼如下：

package com.cjs.example.controller

import com.cjs.example.dto.UserDto;
import com.cjs.example.service.UserService;
import org.springframework
 
.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import java.util.List;

@RestController
public class HelloController {
    @Autowired
    private UserService userService;
 

    @RequestMapping(value="/hello", method=RequestMethod.GET)
    public String hello(){return "hello world!";}
    @RequestMapping(value="/alluser", method=RequestMethod.GET)
    public List<UserDto> getAllUser(){return userService.selectAllUser();}
}

5、UserService以及UserServiceImpl程式碼如下：

package com.cjs.example.service
import com.cjs.example.dto.UserDto;
import java.util.List;

public interface UserService{
    List<UserDto> selectAllUser();
}

package com.cjs.example.service.impl;

import com.cjs.example.dao.UserDao;
import com.cjs.example.dto.UserDto;
import com.cjs.example.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;

@Service
public class UserServiceImpl implements UserService{
    @Autowired
    private UserDao userDao;
    @Override
    public List<UserDto> selectAllUser(){
        return userDao.selectAlluser();
    }
}

6、UserDao程式碼如下：

package com.cjs.example.dao;

import com.cjs.example.dto.UserDto;
import org.springframework.stereotype.Repositort;
import java.util.List;

@Repository
public interface UserDao{
    List<UserDto> selectAllUser();
}

7、UserMapper.xml程式碼如下：

<?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="com.cjs.example.dao.UserDao">
    <resulrMap id="userList" type="com.cjs.example.dto.UserDto">
        <result property="userId" column="userId"/>
        <result property="name" column="name"/>
    </resultMap>
    <select id="selectAllUser" resultMap="userList">
        select user_id as userId,name as name from tbl_user;
    </select>
</mapper>

8、整個工程配置在application.properties中，配置如下

server.port:9999
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/systemdb?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true
spring.datasource.username=root
spring.datasource.password=root
mybatis.mapper-locations=classpath:mapper/*.xml
management.security.enabled=false

9、以及pom.xml配置相關如下：

<?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">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.cjs</groupId>
    <artifactId>springboottest1</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

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

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <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>1.3.2</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>5.1.25</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-complier-plugin</artifactId>
                <configuration>
                    <source>1.8</source>
                    <target>1.8</target>
                    <encoding>UTF-8</encoding>
                    <fork>false</fork>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <mainClass>com.cjs.example.DemoApplication</mainClass>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>repackage</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>


</project>

10、備註：actuator為監控與管理工具，存在以下連結可以訪問：

應用配置類：
1、應用自動化配置報告：/autoconfig
2、上下文中建立的bean：/beans
3、應用中配置的屬性資訊報告：/configprops
4、應用所有可用的環境屬性報告：/env
5、所有spring mvc的控制器對映關係報告：/mappings
6、返回應用自定義的資訊：/info
度量指標類：
1、返回當前應用的各類重要度量指標，比如記憶體資訊、執行緒資訊、垃圾回收資訊：/metrics