idea 社区版+spring boot+ssm+swagger创建rest api

新手上路，出了好多错，记录一下

1.创建数据库：springBootSsmTest

2.打开IDEA创建 Spring boot项目：File——New——Project——Spring Assistant，下一步，填好包名等信息，下一步

Develop Tool选Lombok

Web选Spring Web

SQL选Jpa，Mysql，Mybatis

3.把java文件夹标识 为Source Root（右键，Mark as Directory As —— Source Root）

4.在com.my.demo下创建package命名为model，然后在这里创建 Java 类

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@NoArgsConstructor
@AllArgsConstructor
@Data
@Entity
@Table(name = "tb_user")
public class User {
    @Id

@GeneratedValue(strategy = GenerationType.IDENTITY)

    private Integer id;
    private String userName;
    private String password;
    private String email;
}

5.在resources下创建文件application.yml，删除原先的application.properties，粘帖如下代码：

spring:
  datasource:
    driver-class-name: com.mysql.jdbc.Driver
    url:  jdbc:mysql://127.0.0.1:3306/springbootssmtest?serverTimezone=UTC
    username:  root
    password:  123456

  jpa:
    hibernate:
      ddl-auto: update
    show-sql: true
6.运行程序，会自动生成数据表。
7.创建package命名为mapper，添加一个java类，命名为UserMapper

import java.util.List;
public interface UserMapper {
    User getUser(Integer id);//根据id获取信息
    boolean addUser(User user);//新增
    boolean modifyUser(User user);//修改
    boolean deleteUser(Integer id);//根据id删除
    List<User> getAll();//获取所有
}
8.创建package命名为service，添加一个java类，命名为UserService

@Service
public class UserService {
    @Autowired
    private UserMapper userMapper;

    public User getUser(Integer id){
        return userMapper.getUser(id);
    }

    public boolean addUser(User user){
        return userMapper.addUser(user);
    }

    public boolean modifyUser(User user){
        return userMapper.modifyUser(user);
    }

    public boolean deleteUser(Integer id){
        return userMapper.deleteUser(id);
    }

    public List<User> getAll(){
        return userMapper.getAll();
    }
}
9.创建package命名为controller，创建Java类命名为UserController

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


    /**
     * 获取默认的数据源信息
     * @return
     * @throws SQLException
     */
    
    /**
     * 根据id获取信息
     * @param id
     * @return
     * @throws SQLException
     */
    @ResponseBody
    @GetMapping("/user/get/{id}")
    public User getUser(@PathVariable("id") Integer id){
        return userService.getUser(id);
    }

    /**
     * 获取所有信息
     * @return
     */
    @ResponseBody
    @GetMapping("/user/list")
    public List<User> getAll(){
        return userService.getAll();
    }

    /**
     * 新增信息
     * @param user
     * @return
     */
    @ResponseBody
    @PostMapping("/user/add")
    public boolean addUser(@RequestBody User user){
        return userService.addUser(user);
    }

    /**
     * 修改信息
     * @param user
     * @return
     */
    @ResponseBody
    @PutMapping("/user/put")
    public boolean modifyUser(@RequestBody User user){
        return userService.modifyUser(user);
    }

    /**
     * 删除信息
     * @param id
     * @return
     */
    @ResponseBody
    @DeleteMapping("/user/delete/{id}")
    public boolean deleteUser(@PathVariable("id") Integer id){
        return userService.deleteUser(id);
    }
}
10.添加依赖，Import Change

<!-- 整合Swagger依赖方便 REST测试  -->
<dependency>
   <groupId>io.springfox</groupId>
   <artifactId>springfox-swagger2</artifactId>
   <version>2.9.2</version>
</dependency>
<dependency>
   <groupId>io.springfox</groupId>
   <artifactId>springfox-swagger-ui</artifactId>
   <version>2.7.0</version>
</dependency>

11.打开主类，添加注解，记得改包名

@MapperScan("com.my.demo.mapper")//自动扫描的Mapper包，如果这里不指定，则需要在每个Mapper接口中添加@Mapper主键(这两种方法二选一)
@EnableSwagger2 //开启Swagger2功能，方便测试RestApi
12.在resources下创建目录mapper，添加一个文件UserMapper，记得修改文件中两处包名。

<?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.my.demo.mapper.UserMapper">
<resultMap id="BaseResultMap" type="com.my.demo.model.User">
<id column="id" jdbcType="INTEGER" property="id"/>
<result column="user_name" jdbcType="VARCHAR" property="userName"/>
<result column="password" jdbcType="VARCHAR" property="password"/>
<result column="email" jdbcType="VARCHAR" property="email"/>
</resultMap>
<!-- 根据id获取信息 -->
<select id="getUser" parameterType="java.lang.Integer" resultMap="BaseResultMap">
select * from tb_user t where t.id = #{id}
</select>
<!-- 获取所有信息 -->
<select id="getAll" resultMap="BaseResultMap">
select * from tb_user t
</select>
<!-- 新增 -->
<insert id="addUser" parameterType="user">
insert into tb_user values(default,#{userName},#{password},#{email})
</insert>
<!-- 修改 -->
<update id="modifyUser" parameterType="user">
update tb_user set user_name=#{userName},password=#{password},email=#{email} where id = #{id}
</update>
<!-- 删除 -->
<delete id="deleteUser" parameterType="java.lang.Integer">
delete from tb_user where id = #{id}
</delete>
</mapper>
13.在application.yml中添加，记得改包名，顶格，和spring同一层次。

# Mybatis相关配置
mybatis:
# 对象别名包
type-aliases-package: com.my.demo.model
# Mybatis mapper.xml映射文件配置
mapper-locations:
- classpath:mappers/*.xml

14.运行程序吧。