最全面的springBoot集成mybatis+mysql项目搭建经验分享

最新推荐文章于 2024-05-21 23:25:55 发布

It_BeeCoder

最新推荐文章于 2024-05-21 23:25:55 发布

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大家都知道，现在Spring框架几乎无处不用，目前最新版本据说是Spring5，现在常用的基本还是Spring4.X，很多公司甚至用的还是Spring3.x，而Spring领域其中最好用的莫过于SpringBoot，这是从SpringMVC衍变出来的，本质还是SpringMVC，但是要比SpringMVC好用的多，因为很好用，所以笔者闲暇之际用SpringBoot从头至尾摸索着搭建了一个案例，分享出来，希望对感兴趣的朋友有所帮助。废话不说了，进入主题，直接分享案例搭建全流程。

本项目使用的环境：

开发工具：Intellij IDEA 2017.1.3
jdk：1.8.0_51
maven:3.5.2

额外功能

mybatis generator 自动生成代码插件

步骤：

1.创建一个springboot项目：
2.创建项目的文件结构以及jdk的版本
3.选择项目所需要的依赖
选择持久化框架的依赖
然后点击finish
5.项目结构如下：
6.查看文件pom.xml：
```
 
```
1. <?xml version="1.0" encoding="UTF-8"?>
2. <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
3. xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
4. <modelVersion>4.0.0</modelVersion>
6. <groupId>com.ocean</groupId>
7. <artifactId>springboot-mybatis-demo</artifactId>
8. <version>0.0.1-SNAPSHOT</version>
9. <packaging>jar</packaging>
11. <name>springboot-mybatis-demo</name>
12. <description>Demo project for Spring Boot</description>
14. <parent>
15. <groupId>org.springframework.boot</groupId>
16. <artifactId>spring-boot-starter-parent</artifactId>
17. <version>1.5.10.RELEASE</version>
18. <relativePath/> 
19. </parent>
21. <properties>
22. <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
23. <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
24. <java.version>1.8</java.version>
25. </properties>
27. <dependencies>
28. <dependency>
29. <groupId>org.springframework.boot</groupId>
30. <artifactId>spring-boot-starter-jdbc</artifactId>
31. </dependency>
32. <dependency>
33. <groupId>org.mybatis.spring.boot</groupId>
34. <artifactId>mybatis-spring-boot-starter</artifactId>
35. <version>1.3.1</version>
36. </dependency>
37. <dependency>
38. <groupId>org.springframework.boot</groupId>
39. <artifactId>spring-boot-starter-web</artifactId>
40. </dependency>
42. <dependency>
43. <groupId>mysql</groupId>
44. <artifactId>mysql-connector-java</artifactId>
45. <version>5.1.6</version>
46. </dependency>
47. <dependency>
48. <groupId>org.springframework.boot</groupId>
49. <artifactId>spring-boot-starter-test</artifactId>
50. <scope>test</scope>
51. </dependency>
52. </dependencies>
54. <build>
55. <plugins>
56. <plugin>
57. <groupId>org.springframework.boot</groupId>
58. <artifactId>spring-boot-maven-plugin</artifactId>
59. </plugin>
60. 
61. <plugin>
62. <groupId>org.mybatis.generator</groupId>
63. <artifactId>mybatis-generator-maven-plugin</artifactId>
64. <version>1.3.1</version>
65. <configuration>
66. <configurationFile>${basedir}/src/main/resources/generator/generatorConfig.xml</configurationFile>
67. <overwrite>true</overwrite>
68. <verbose>true</verbose>
69. </configuration>
70. </plugin>
71. </plugins>
72. </build>
73. </project>
7.本案例不使用application.properties文件而使用更加简洁的application.yml文件。将resource文件夹下原有的application.properties文件删除，创建application.yml配置文件（备注：其实SpringBoot底层会把application.yml文件解析为application.properties）， 文件的内容如下(此处只配置最基本的)：
```
 
```
1. server:
2. port: 8080
4. spring:
5. datasource:
6. name: test
7. url: jdbc:mysql://127.0.0.1:3306/chenyun01
8. username: root
9. password: root
10. driver-class-name: com.mysql.jdbc.Driver
11. mybatis:
12. mapper-locations: classpath:mapping/*Mapper.xml
13. type-aliases-package: com.ocean.pojo
8.创建数据库：
在mysql（此处用SQLyog客户端）下创建数据库chenyun01，新建数据表userInfo，插入2条数据，结构如下
9.配置mybatis generator 自动生成代码插件
配置pom.xml中generator 插件所对应的配置文件 ${basedir}/src/main/resources/generator/generatorConfig.xml
```
 
```
1. <?xml version="1.0" encoding="UTF-8"?>
2. <!DOCTYPE generatorConfiguration
3. PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
4. "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
5. <generatorConfiguration>
6. 
7. <classPathEntry location="D:\dataSourceDriver\mysql-connector-java-5.1.6-bin.jar"/>
8. <context id="DB2Tables" targetRuntime="MyBatis3">
9. <commentGenerator>
10. <property name="suppressDate" value="true"/>
11. 
12. <property name="suppressAllComments" value="false"/>
13. </commentGenerator>
14. 
15. <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://127.0.0.1/chenyun01" userId="root" password="root">
16. </jdbcConnection>
17. <javaTypeResolver>
18. <property name="forceBigDecimals" value="false"/>
19. </javaTypeResolver>
20. 
21. <javaModelGenerator targetPackage="com.ocean.pojo" targetProject="src">
22. <property name="enableSubPackages" value="true"/>
23. <property name="trimStrings" value="true"/>
24. </javaModelGenerator>
25. 
26. <sqlMapGenerator targetPackage="resources.mapping" targetProject="src">
27. <property name="enableSubPackages" value="true"/>
28. </sqlMapGenerator>
29. 
30. <javaClientGenerator type="XMLMAPPER" targetPackage="com.ocean.dao" targetProject="src">
31. <property name="enableSubPackages" value="true"/>
32. </javaClientGenerator>
33. 
34. <table tableName="userInfo" domainObjectName="UserInfo" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>
35. </context>
36. </generatorConfiguration>
- 自动生成代码：点击run----> Edit Configurations
- 添加配置
- 运行
- 最后生成的项目结构：
- 10.我们还需要修改有点东西，因为生成的类中的路径写了全路径，所以我们要把前面多余的（main.java.）删掉：
- 生成的接口文件UserMapper.java
```
 
```
  1. package com.ocean.dao;
  2. import com.ocean.pojo.UserInfo;
  4. import java.util.List;
  6. public interface UserInfoMapper {
  7. /**
  8. * This method was generated by MyBatis Generator.
  9. * This method corresponds to the database table userinfo
  10. *
  11. * @mbggenerated
  12. */
  13. int insert(UserInfo record);
  15. /**
  16. * This method was generated by MyBatis Generator.
  17. * This method corresponds to the database table userInfo
  18. *
  19. * @mbggenerated
  20. */
  21. int insertSelective(com.ocean.pojo.UserInfo record);
  22. //这个方式我自己单独加的方法
  23. List findAllUser();
  24. }
- 模型(POJO)UserInfo.java
- ```
 
```
  1. package com.ocean.pojo;
  3. public class UserInfo {
  4. /**
  5. * This field was generated by MyBatis Generator.
  6. * This field corresponds to the database column userinfo.userId
  7. *
  8. * @mbggenerated
  9. */
  10. private Integer userid;
  12. /**
  13. * This field was generated by MyBatis Generator.
  14. * This field corresponds to the database column userinfo.userName
  15. *
  16. * @mbggenerated
  17. */
  18. private String username;
  20. /**
  21. * This field was generated by MyBatis Generator.
  22. * This field corresponds to the database column userinfo.phone
  23. *
  24. * @mbggenerated
  25. */
  26. private String phone;
  28. /**
  29. * This field was generated by MyBatis Generator.
  30. * This field corresponds to the database column userinfo.sex
  31. *
  32. * @mbggenerated
  33. */
  34. private String sex;
  36. /**
  37. * This method was generated by MyBatis Generator.
  38. * This method returns the value of the database column userinfo.userId
  39. *
  40. * @return the value of userinfo.userId
  41. *
  42. * @mbggenerated
  43. */
  44. public Integer getUserid() {
  45. return userid;
  46. }
  48. /**
  49. * This method was generated by MyBatis Generator.
  50. * This method sets the value of the database column userinfo.userId
  51. *
  52. * @param userid the value for userinfo.userId
  53. *
  54. * @mbggenerated
  55. */
  56. public void setUserid(Integer userid) {
  57. this.userid = userid;
  58. }
  60. /**
  61. * This method was generated by MyBatis Generator.
  62. * This method returns the value of the database column userinfo.userName
  63. *
  64. * @return the value of userinfo.userName
  65. *
  66. * @mbggenerated
  67. */
  68. public String getUsername() {
  69. return username;
  70. }
  72. /**
  73. * This method was generated by MyBatis Generator.
  74. * This method sets the value of the database column userinfo.userName
  75. *
  76. * @param username the value for userinfo.userName
  77. *
  78. * @mbggenerated
  79. */
  80. public void setUsername(String username) {
  81. this.username = username == null ? null : username.trim();
  82. }
  84. /**
  85. * This method was generated by MyBatis Generator.
  86. * This method returns the value of the database column userinfo.phone
  87. *
  88. * @return the value of userinfo.phone
  89. *
  90. * @mbggenerated
  91. */
  92. public String getPhone() {
  93. return phone;
  94. }
  96. /**
  97. * This method was generated by MyBatis Generator.
  98. * This method sets the value of the database column userinfo.phone
  99. *
  100. * @param phone the value for userinfo.phone
  101. *
  102. * @mbggenerated
  103. */
  104. public void setPhone(String phone) {
  105. this.phone = phone == null ? null : phone.trim();
  106. }
  108. /**
  109. * This method was generated by MyBatis Generator.
  110. * This method returns the value of the database column userinfo.sex
  111. *
  112. * @return the value of userinfo.sex
  113. *
  114. * @mbggenerated
  115. */
  116. public String getSex() {
  117. return sex;
  118. }
  120. /**
  121. * This method was generated by MyBatis Generator.
  122. * This method sets the value of the database column userinfo.sex
  123. *
  124. * @param sex the value for userinfo.sex
  125. *
  126. * @mbggenerated
  127. */
  128. public void setSex(String sex) {
  129. this.sex = sex == null ? null : sex.trim();
  130. }
  131. }
  对于映射文件UserInfoMapper.xml,删除多余的“main.java.”字符，配置xml的namespace
- 如果有的人的xml里的sql语句有黄色的背景，真心看不下去时（解决方案按照下图）：
- UserMapper.xml
```
 
```
  1. <?xml version="1.0" encoding="UTF-8"?>
  2. <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
  3. <mapper namespace="com.ocean.dao.UserInfoMapper">
  4. <resultMap id="BaseResultMap" type="com.ocean.pojo.UserInfo">
  5. 
  9. <result column="userId" jdbcType="INTEGER" property="userid" />
  10. <result column="userName" jdbcType="VARCHAR" property="username" />
  11. <result column="phone" jdbcType="VARCHAR" property="phone" />
  12. <result column="sex" jdbcType="VARCHAR" property="sex" />
  13. </resultMap>
  14. <insert id="insert" parameterType="com.ocean.pojo.UserInfo">
  15. 
  19. insert into userinfo (userId, userName, phone,
  20. sex)
  21. values (#{userid,jdbcType=INTEGER}, #{username,jdbcType=VARCHAR}, #{phone,jdbcType=VARCHAR},
  22. #{sex,jdbcType=VARCHAR})
  23. </insert>
  24. <insert id="insertSelective" parameterType="com.ocean.pojo.UserInfo">
  25. 
  29. insert into userinfo
  30. <trim prefix="(" suffix=")" suffixOverrides=",">
  31. <if test="userid != null">
  32. userId,
  33. </if>
  34. <if test="username != null">
  35. userName,
  36. </if>
  37. <if test="phone != null">
  38. phone,
  39. </if>
  40. <if test="sex != null">
  41. sex,
  42. </if>
  43. </trim>
  44. <trim prefix="values (" suffix=")" suffixOverrides=",">
  45. <if test="userid != null">
  46. #{userid,jdbcType=INTEGER},
  47. </if>
  48. <if test="username != null">
  49. #{username,jdbcType=VARCHAR},
  50. </if>
  51. <if test="phone != null">
  52. #{phone,jdbcType=VARCHAR},
  53. </if>
  54. <if test="sex != null">
  55. #{sex,jdbcType=VARCHAR},
  56. </if>
  57. </trim>
  58. </insert>
  59. 
  60. <select id="findAllUser" resultType="com.ocean.pojo.UserInfo">
  61. select * from USERINFO
  62. </select>
  63. </mapper>
  11.打开类SpringbootMybatisDemoApplication.java，这个是springboot的启动类。我们需要添加点东西：
- ```
 
```
  1. package com.ocean.springbootmybatisdemo;
  3. import org.mybatis.spring.annotation.MapperScan;
  4. import org.springframework.boot.SpringApplication;
  5. import org.springframework.boot.autoconfigure.SpringBootApplication;
  6. import org.springframework.boot.context.embedded.EmbeddedServletContainerCustomizer;
  7. import org.springframework.boot.web.servlet.ErrorPage;
  8. import org.springframework.context.annotation.Bean;
  9. import org.springframework.context.annotation.ComponentScan;
  10. import org.springframework.http.HttpStatus;
  12. @SpringBootApplication
  13. @MapperScan("com.ocean.dao")
  14. @ComponentScan(basePackages = {"com.ocean.*"})
  15. public class SpringbootMybatisDemoApplication {
  17. public static void main(String[] args) {
  18. SpringApplication.run(SpringbootMybatisDemoApplication.class, args);
  19. }
  20. }
  12.到这里本案例的搭建工作都完成了，接下来就是直接在浏览器上测试：
  首先看一下完成之后的文件的结构：
- 现在把controller，service层的代码都写好(因做演示，此处控制器只写了一个方法)：UserController.java
- ```
 
```
  1. package com.ocean.controller;
  3. import com.ocean.service.IUserService;
  4. import org.springframework.beans.factory.annotation.Autowired;
  5. import org.springframework.web.bind.annotation.RequestMapping;
  6. import org.springframework.web.bind.annotation.RequestMethod;
  7. import org.springframework.web.bind.annotation.RestController;
  9. import java.util.List;
  11. @RestController
  12. @RequestMapping(value = {"/user"})
  13. public class UserController {
  15. @Autowired
  16. private IUserService userService;
  18. @RequestMapping(value = {"/findAll"},produces = {"application/json;charset=UTF-8"},method = RequestMethod.GET)
  19. public List getAllUsers(){
  20. List list = userService.findAllUser();
  21. return list;
  22. }
  23. }
  IUserService.java
- ```
 
```
  1. package com.ocean.service;
  3. import java.util.List;
  5. public interface IUserService {
  6. List findAllUser();
  7. }
  UserServiceImpl.java
- ```
 
```
  1. package com.ocean.service.impl;
  3. import com.ocean.dao.UserInfoMapper;
  4. import com.ocean.service.IUserService;
  5. import org.springframework.beans.factory.annotation.Autowired;
  6. import org.springframework.stereotype.Service;
  8. import java.util.List;
  10. @Service(value = "userService")
  11. public class UserServiceImpl implements IUserService {
  13. @Autowired
  14. private UserInfoMapper userDao;//这里可能会报错，但是并不会影响
  16. @Override
  17. public List findAllUser(){
  18. return userDao.findAllUser();
  19. }
  20. }
  如果强迫症看不下去上面那个报错：（解决方法）
- 直接在浏览器访问，返回的数据确实是表里插入的2条数据，说明项目已经搭建成功了！！
- 源码地址：https://github.com/guobinhui/javaWeb-project/tree/master/springboot-mybatis-demo