spring boot mybatis 整合教程

亦凉 2022-04-23 09:32 237阅读 0赞

### 一、java web开发环境搭建 ###

网上有很多教程，参考教程：[http://www.cnblogs.com/Leo\_wl/p/4752875.html][http_www.cnblogs.com_Leo_wl_p_4752875.html]

### 二、Spring boot搭建 ###

1、Intellij idea菜单栏File->new->project。

![1021293-20171103164802107-925906148.jpg][]

2、选择左侧栏中spring initializr，右侧选择jdk版本，以及默认的Service URL，点击next。

![1021293-20171103165225607-1988078846.jpg][]

3、然后填写项目的Group、Artifact等信息，helloworld阶段选默认就可以了，点击next。

![1021293-20171103165942920-732485372.jpg][]

4、左侧点击Web，中间一侧选择Web，然后左侧选择SQL，中间一侧选择JPA、Mybatis、MYSQL（LZ数据库用的是mysql，大家可以选择其他DB），点击next。

![1021293-20171103170435966-1914213735.jpg][]

5、填写Project name 等信息，然后点击Finish。

![1021293-20171103170712232-355474608.jpg][]

至此，一个maven web项目就创建好了，目录结构如下：

![1021293-20171103173658701-1682099995.jpg][]

这样，Spring boot就搭建好了，pom.xml里已经有了Spring boot的jar包，包括我们的mysql数据连接的jar包。Spring boot内置了类似tomcat这样的中间件，所以，只要运行DemoApplication中的main方法就可以启动项目了。我们测试一下。

在src/main/java下新建目录com/demo/entity/User。

package com.demo.entity;
    
    public class User {
        private String name;
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    }

相同目录下新建com/demo/controller/TestBootController。

package com.demo.controller;
    
    import com.demo.entity.User;
    import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    @EnableAutoConfiguration
    @RequestMapping("/testboot")
    public class TestBootController {
        @RequestMapping("getuser")
        public User getUser() {
            User user = new User();
            user.setName("test");
            return user;
        }
    }

spring boot启动DemoAplication是需要扫描它下面的Controller等类的，所以将DemoApplication移动到com/demo目录下。还有就是Spring boot启动默认是要加载数据源的，所以我们在src/main/resources下新建application.yml：

#默认使用配置
    spring:
      profiles:
        active: dev
    
    #公共配置与profiles选择无关
    mybatis:
      typeAliasesPackage: com.xdd.entity
      mapperLocations: classpath:mapper/*.xml
    
    
    ---
    
    #开发配置
    spring:
      profiles: dev
    
      datasource:
        url: jdbc:mysql://localhost:3306/test
        username: root
        password: root
        driver-class-name: com.mysql.jdbc.Driver

或者将pom.xml中加载数据源的jar包先注释掉也可以。

/*<dependency>
       <groupId>org.mybatis.spring.boot</groupId>
       <artifactId>mybatis-spring-boot-starter</artifactId>
       <version>1.3.0</version>
    </dependency>*/

最终的目录结构如下，

![1021293-20171103182546435-821594132.jpg][]

启动DemoApplication的main方法，访问http://localhost:8080/testboot/getuser即可。

![1021293-20171103181401685-796775716.jpg][]

### 三、整合Mybatis ###

1、集成druid，使用连接池。pom.xml中添加：

<dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>druid</artifactId>
        <version>1.1.0</version>
    </dependency>

最终的pom.xml文件：

<?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.arm</groupId>
        <artifactId>demo</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>1.5.8.RELEASE</version>
            <relativePath/> 
        </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-data-jpa</artifactId>
            </dependency>
            <dependency>
                <groupId>org.mybatis.spring.boot</groupId>
                <artifactId>mybatis-spring-boot-starter</artifactId>
                <version>1.3.1</version>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-web</artifactId>
            </dependency>
    
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <scope>runtime</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
    
    
            <dependency>
                <groupId>com.alibaba</groupId>
                <artifactId>druid</artifactId>
                <version>1.1.0</version>
            </dependency>
    
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    
    </project>

在application.yml中添加数据源、Mybatis的实体和配置文件位置。

#默认使用配置
    spring:
      profiles:
        active: dev
    
    #公共配置与profiles选择无关 mapperLocations指的路径是src/main/resources
    mybatis:
      typeAliasesPackage: com.xdd.entity
      mapperLocations: classpath:mapper/*.xml
    
    
    ---
    
    #开发配置
    spring:
      profiles: dev
    
      datasource:
        url: jdbc:mysql://localhost:3306/test
        username: root
        password: root
        driver-class-name: com.mysql.jdbc.Driver
        # 使用druid数据源
        type: com.alibaba.druid.pool.DruidDataSource

就这样就整合完成了！我们测试一下。

用MyBatis Generator自动生成代码，参考博文：[http://blog.csdn.net/zhshulin/article/details/23912615][http_blog.csdn.net_zhshulin_article_details_23912615] 这里列一下自动生成的代码。

import com.xdd.entity.User;
    import org.springframework.stereotype.Component;
    
    public interface UserDao {
        int deleteByPrimaryKey(Integer id);
    
        int insert(User record);
    
        int insertSelective(User record);
    
        User selectByPrimaryKey(Integer id);
    
        int updateByPrimaryKeySelective(User record);
    
        int updateByPrimaryKey(User record);
    }

UserMapper.xml

<?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.xdd.dao.UserDao" >
        <resultMap id="BaseResultMap" type="com.xdd.entity.User" >
            <id column="id" property="id" jdbcType="INTEGER" />
            <result column="user_name" property="userName" jdbcType="VARCHAR" />
            <result column="password" property="password" jdbcType="VARCHAR" />
            <result column="age" property="age" jdbcType="INTEGER" />
        </resultMap>
        <sql id="Base_Column_List" >
            id, user_name, password, age
        </sql>
        <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer" >
            select
            <include refid="Base_Column_List" />
            from user_t
            where id = #{id,jdbcType=INTEGER}
        </select>
        <delete id="deleteByPrimaryKey" parameterType="java.lang.Integer" >
            delete from user_t
            where id = #{id,jdbcType=INTEGER}
        </delete>
        <insert id="insert" parameterType="com.xdd.entity.User" >
            insert into user_t (id, user_name, password,
            age)
            values (#{id,jdbcType=INTEGER}, #{userName,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR},
            #{age,jdbcType=INTEGER})
        </insert>
        <insert id="insertSelective" parameterType="com.xdd.entity.User" >
            insert into user_t
            <trim prefix="(" suffix=")" suffixOverrides="," >
                <if test="id != null" >
                    id,
                </if>
                <if test="userName != null" >
                    user_name,
                </if>
                <if test="password != null" >
                    password,
                </if>
                <if test="age != null" >
                    age,
                </if>
            </trim>
            <trim prefix="values (" suffix=")" suffixOverrides="," >
                <if test="id != null" >
                    #{id,jdbcType=INTEGER},
                </if>
                <if test="userName != null" >
                    #{userName,jdbcType=VARCHAR},
                </if>
                <if test="password != null" >
                    #{password,jdbcType=VARCHAR},
                </if>
                <if test="age != null" >
                    #{age,jdbcType=INTEGER},
                </if>
            </trim>
        </insert>
        <update id="updateByPrimaryKeySelective" parameterType="com.xdd.entity.User" >
            update user_t
            <set >
                <if test="userName != null" >
                    user_name = #{userName,jdbcType=VARCHAR},
                </if>
                <if test="password != null" >
                    password = #{password,jdbcType=VARCHAR},
                </if>
                <if test="age != null" >
                    age = #{age,jdbcType=INTEGER},
                </if>
            </set>
            where id = #{id,jdbcType=INTEGER}
        </update>
        <update id="updateByPrimaryKey" parameterType="com.xdd.entity.User" >
            update user_t
            set user_name = #{userName,jdbcType=VARCHAR},
            password = #{password,jdbcType=VARCHAR},
            age = #{age,jdbcType=INTEGER}
            where id = #{id,jdbcType=INTEGER}
        </update>
    </mapper>

public class User {
        private Integer id;
    
        private String userName;
    
        private String password;
    
        private Integer age;
    
        public Integer getId() {
            return id;
        }
    
        public void setId(Integer id) {
            this.id = id;
        }
    
        public String getUserName() {
            return userName;
        }
    
        public void setUserName(String userName) {
            this.userName = userName == null ? null : userName.trim();
        }
    
        public String getPassword() {
            return password;
        }
    
        public void setPassword(String password) {
            this.password = password == null ? null : password.trim();
        }
    
        public Integer getAge() {
            return age;
        }
    
        public void setAge(Integer age) {
            this.age = age;
        }
    }

最后将DemoApplication.java修改一下，让其扫描dao层接口。

import org.mybatis.spring.annotation.MapperScan;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.web.support.SpringBootServletInitializer;
    
    @SpringBootApplication
    @MapperScan("com.xdd.dao")
    public class DemoApplication extends SpringBootServletInitializer{
        public static void main(String[] args) {
            SpringApplication.run(DemoApplication.class,args);
        }
    }

自己添加controller和service

import java.util.List;
    import java.util.Map;
    
    public interface UserService {
        public User getUserById(int userId);
    
        boolean addUser(User record);
    
    }

import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    
    import javax.annotation.Resource;
    import java.util.List;
    import java.util.Map;
    
    @Service("userService")
    public class UserServiceImpl implements UserService {
    
        @Resource
        private UserDao userDao;
    
    
        public User getUserById(int userId) {
            return userDao.selectByPrimaryKey(userId);
        }
    
        public boolean addUser(User record){
            boolean result = false;
            try {
                userDao.insertSelective(record);
                result = true;
            } catch (Exception e) {
                e.printStackTrace();
            }
    
            return result;
        }
    
    }

@Controller
    @RequestMapping("/user")
    public class UserController {
        @Resource
        private UserService userService;
    
        @RequestMapping("/showUser")
        @ResponseBody
        public User toIndex(HttpServletRequest request, Model model){
            int userId = Integer.parseInt(request.getParameter("id"));
            User user = this.userService.getUserById(userId);
            return user;
        }
    
    }

浏览器访问http://localhost:8080/user/showUser?id=1

![1021293-20171103184740795-997988746.jpg][]

以前找别人的教程的时候总是嫌弃人家写的不详细，真的自己写的时候发现很多细节我也详细介绍不到，比如yml文件使用，比如数据库，看来还是要求别人容易，要求自己难。

[http_www.cnblogs.com_Leo_wl_p_4752875.html]: http://www.cnblogs.com/Leo_wl/p/4752875.html
[1021293-20171103164802107-925906148.jpg]: /images/20220321/e0e781844e61461bbb1b0fdfd63739cf.png
[1021293-20171103165225607-1988078846.jpg]: /images/20220321/9e1f9b0a25354141b1607ba0967041ae.png
[1021293-20171103165942920-732485372.jpg]: /images/20220321/72a9d80056c34fcb93b3169fd9970cc3.png
[1021293-20171103170435966-1914213735.jpg]: /images/20220321/cffd44632464481baaa625c3155e619c.png
[1021293-20171103170712232-355474608.jpg]: /images/20220321/00a674ba3395456e9bc410f89b970135.png
[1021293-20171103173658701-1682099995.jpg]: /images/20220321/ed3e65041c824196a3b2dfce4cd72d9a.png
[1021293-20171103182546435-821594132.jpg]: /images/20220321/ad72c9bfab0a4195a4c89dc85d3090a2.png
[1021293-20171103181401685-796775716.jpg]: /images/20220321/297378a725dd4a679c3d50ad64bd970b.png
[http_blog.csdn.net_zhshulin_article_details_23912615]: http://blog.csdn.net/zhshulin/article/details/23912615
[1021293-20171103184740795-997988746.jpg]: /images/20220321/5d462e1371744ef1895aabd759f6be66.png