使用 IntelliJ IDEA创建Spring Boot + Mybatis，简单的数据插入、查询等，简单的demo步骤如下：
一、新建项目：
1.File -- New -- Project
2.选择 Spring Initializr ，点 Next
3.Group、Artifact、Name、Package自定义，点 Next
4.选择web、SQL 中的 spring web、MyBatis、MySql，点 Next
5. name自定义，点Finish
6.等待加载完（可能需要一段时间）后如图
7.增加包： bean controller mapper，如图
二、代码录入
1.新增表数据：
1 CREATE TABLE `test1` (
2 `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
3 `user` varchar(50) DEFAULT NULL,
4 `name` varchar(50) DEFAULT NULL,
5 PRIMARY KEY (`id`)
6
2.增加文件 ResultMessage（bean目录下）、UserBean（bean目录下）、MyController（controller目录下）、UserMapper（mapper目录下）
3.application.properties 增加端口配置、mysql数据库连接
1 #端口号
2 server.port = 8082
3
4 #连接数据库配置
5 spring.datasource.url =jdbc:mysql://127.0.0.1:3306/dbname?useUnicode=true&characterEncoding=utf-8&useSSL=false&serverTimezone=UTC
6 spring.datasource.username = username
7 spring.datasource.password = password
8 spring.datasource.driver-class-name = com.mysql.cj.jdbc.Driver
View Code
4.ResultMessage 文件：
1 package com.demo.springmybaits.demo.bean;
2
3 import java.io.Serializable;
4 import java.util.HashMap;
5 import java.util.Map;
6
7 public class ResultMessage implements Serializable {
8 private int code = 0;
9 private String message;
10 private Map<String, Object> attr = new HashMap();
11
12 private ResultMessage() {
13 }
14
15 public static ResultMessage create() {
16 return new ResultMessage();
17 }
18
19 public int getCode() {
20 return this.code;
21 }
22
23 public String getMessage() {
24 return this.message;
25 }
26
27 public void raise(int code, String message) {
28 this.code = code;
29 this.message = message;
30 }
31
32 public void put(String key, Object obj) {
33 this.attr.put(key, obj);
34 }
35
36 public Map<String, Object> getAttr() {
37 return this.attr;
38 }
39
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5.UserBean 文件：
1 package com.demo.springmybaits.demo.bean;
2
3 public class UserBean {
4
5 /** 唯一标识 */
6 private int id;
7
8 private String user;
9
10 private String name;
11
12 public int getId() {
13 return id;
14 }
15
16 public String getUser() {
17 return user;
18 }
19
20 public void setUser(String user) {
21 this.user = user;
22 }
23
24 public String getName() {
25 return name;
26 }
27
28 public void setName(String name) {
29 this.name = name;
30 }
31
32 @Override
33 public String toString() {
34 return "UserBean{" +
35 "id=" + id +
36 ", user='" + user + '\'' +
37 ", name='" + name + '\'' +
38 '}';
39 }
40
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6.MyController 文件：
1 package com.demo.springmybaits.demo.controller;
2
3 import org.springframework.beans.factory.annotation.Autowired;
4 import org.springframework.web.bind.annotation.*;
5 import com.demo.springmybaits.demo.bean.ResultMessage;
6 import com.demo.springmybaits.demo.mapper.UserMapper;
7 import com.demo.springmybaits.demo.bean.UserBean;
8
9
10 @RestController
11 public class MyController {
12
13 @RequestMapping(value = "/", method = RequestMethod.GET)
14 public String helloWorld() {
15 return "hello world";
16 }
17
18 @RequestMapping(value = "/", method = RequestMethod.POST)
19 public String postHttp() {
20 return "postHttp";
21 }
22
23
24 private boolean isNotNull(@RequestParam(value = "user", required = true) String user, @RequestParam(value = "name", required = true) String name, ResultMessage resultMessage) {
25 if (user == null || user.equals("")){
26 resultMessage.raise(-991,"user 不能为空");
27 return true;
28 }else if(name == null || name.equals("")){
29 resultMessage.raise(-992,"name 不能为空");
30 return true;
31 }
32 return false;
33 }
34
35 @Autowired
36 private UserMapper userMapper;
37
38 /**
39 * 数据插入、查询
40 */
41 @RequestMapping(value = "/createUserByPost", method = RequestMethod.POST)
42 public Object registerAccountByPost(@RequestParam(value = "user", required = true) String user,
43 @RequestParam(value = "name", required = true) String name) {
44 System.out.println("user:"+user+"，name:"+name);
45
46 ResultMessage resultMessage = ResultMessage.create();
47
48 /*判断user name空值*/
49 if (isNotNull(user, name, resultMessage)) return resultMessage;
50
51 UserBean userBean = this.userMapper.getByUser(user);
52 if (userBean != null){
53 resultMessage.raise(-994, "user 已存在");
54 return resultMessage;
55 }else{
56 resultMessage.put("user",user);
57 resultMessage.put("name",name);
58 resultMessage.raise(1,"success");
59
60 userBean = new UserBean();
61 userBean.setUser(user);
62 userBean.setName(name);
63 int createUser = this.userMapper.create(userBean);
64 System.out.println("新增成功："+createUser);
65 return resultMessage;
66 }
67 }
68
69 /**
70 * 通过user查询信息
71 */
72 @RequestMapping(value = "/getInfoByUser/{user}", method = RequestMethod.GET)
73 public Object getInfo(@PathVariable String user) {
74 UserBean userBean = this.userMapper.getByUser(user);
75
76 ResultMessage resultMessage = ResultMessage.create();
77
78 if (userBean == null){
79 resultMessage.raise(-1,"user不存在");
80 return resultMessage;
81 }
82
83 resultMessage.put("user",userBean.getUser());
84 resultMessage.put("name",userBean.getName());
85 resultMessage.put("massage",userBean.toString());
86 resultMessage.raise(1,"成功");
87
88 System.out.println("user: "+user);
89 System.out.println("userBean："+userBean.toString());
90 return resultMessage;
91 }
92
93 /**
94 * 通过id查询信息
95 */
96 @RequestMapping(value = "/getInfoById/{id}", method = RequestMethod.GET)
97 public Object getID(@PathVariable int id) {
98 UserBean userBean = this.userMapper.getById(id);
99
100 ResultMessage resultMessage = ResultMessage.create();
101
102 if (userBean == null){
103 resultMessage.raise(-1,"id不存在");
104 return resultMessage;
105 }
106
107 resultMessage.put("user",userBean.getUser());
108 resultMessage.put("name",userBean.getName());
109 resultMessage.put("massage",userBean.toString());
110 resultMessage.raise(1,"成功");
111
112 return resultMessage;
113 }
114
115
116
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7.UserMapper 文件：
1 package com.demo.springmybaits.demo.mapper;
2
3 import com.demo.springmybaits.demo.bean.UserBean;
4 import org.apache.ibatis.annotations.Insert;
5 import org.apache.ibatis.annotations.Mapper;
6 import org.apache.ibatis.annotations.Param;
7 import org.apache.ibatis.annotations.Select;
8
9 @Mapper
10 public interface UserMapper {
11 /**通过id查询*/
12 @Select("SELECT * FROM test1 WHERE id = #{id}")
13 UserBean getById(@Param("id") int id);
14
15 /**通过user查询*/
16 @Select("SELECT * FROM test1 WHERE user = #{user}")
17 UserBean getByUser(@Param("user") String user);
18
19 /**插入表记录*/
20 @Insert("INSERT INTO test1(user,name) VALUES(#{user},#{name})")
21 int create(UserBean userBean);
22
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至此，数据准备完毕
完整文件：https://gitee.com/caiwhy/springMybatisDemo
三、调试
1. get接口 http://127.0.0.1:8082/ 如图：
2.post接口 http://127.0.0.1:8082/ 如图：
3.post 接口，新增数据， http://127.0.0.1:8082/createUserByPost 如图：
4..get 接口，通过id获取信息， http://127.0.0.1:8082/getInfoById/2 如图：
5..get 接口，通过user获取信息， http://127.0.0.1:8082/getInfoByUser/张三user如图：
调试完成！
