IDEA新建一个简单的springboot项目（选择maven版）

1.先对pom.xml进行编写
引入springboot的父类依赖（这样spring的web组件将可以少写很多，maven有继承依赖机制）

<parent>
   <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.3.3.RELEASE</version>
</parent>

添加依赖

 <!-- springboot-web组件 springmvc+spring+mybatis -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <!-- 引入freeMarker的依赖包. -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-freemarker</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

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

注意：如果报错Cannot determine embedded database driver class for database type NONE.请删除

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>

2.新添加一个类（里面有注释，启动类和控制器写一起了）

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.HashMap;
import java.util.Map;

/*
*自动装载外部项目@Configuration配置类
*/
@EnableAutoConfiguration
/*
 *接口返回JSON的注解
 */
@RestController
public class TestController {

    @RequestMapping("/index")
    public String index(){
        return "success";
    }

    @RequestMapping("/getMap")
    public Map<String,Object> getMap(){
        Map<String,Object> map = new HashMap<>();
        map.put("errorCode","666");
        map.put("errorMessage","错误消息");
        return map;
    }

    public static void main(String[] args) {
        //主函数运行springboot
        SpringApplication.run(TestController.class,args);
    }

}

3.先maven的clear，install然后在运行程序
在浏览器输入http://localhost:8080/getMap，得到：

本文地址：https://blog.csdn.net/GodGump/article/details/110195082