springboot2.0+mybatis整合 demo

springboot2.0+大家应该都了解过吧，2.0+的配置跟1.5的配置其实差不多，有一些略微的不同。面对SSM的复杂配置，springboot+mybatis的整合是真的非常方便，接下来我会展示一些springboot2.0+mybatis的整合过程，也会提供2个已经实现并且直接使用的demo地址。还有2个报错注意点。

csdn下载地址:https://download.csdn.net/download/sneakyrogue/10939274

github下载地址：https://github.com/luxin763323387/springboot_mybatis_demo

1首先创建一个springboot项目

点击next

group 是你的包名

artifack是你的项目名

->next

勾一个Web吧，其实也无所谓后面直接pom 复制粘贴一波就有了。

->finish

OK,接下来我们就来一波CV操作

对pom.xml进行一波复制粘贴，吧dependencys 和 build里面替换一下

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.8.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.cn.lx</groupId>
    <artifactId>demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>demo</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </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>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.4</version>
        </dependency>


        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-databind</artifactId>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.datatype</groupId>
            <artifactId>jackson-datatype-joda</artifactId>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.module</groupId>
            <artifactId>jackson-module-parameter-names</artifactId>
        </dependency>
        <!-- 分页插件 -->
        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper-spring-boot-starter</artifactId>
            <version>1.2.5</version>
        </dependency>
        <!-- alibaba的druid数据库连接池 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.1.9</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <plugin>
                <groupId>org.mybatis.generator</groupId>
                <artifactId>mybatis-generator-maven-plugin</artifactId>
                <version>1.3.6</version>
                <dependencies>
                    <dependency>
                        <groupId> mysql</groupId>
                        <artifactId> mysql-connector-java</artifactId>
                        <version> 5.1.47</version>
                    </dependency>
                    <dependency>
                        <groupId>org.mybatis.generator</groupId>
                        <artifactId>mybatis-generator-core</artifactId>
                        <version>1.3.6</version>
                    </dependency>
                </dependencies>
                <executions>
                    <execution>
                        <id>Generate MyBatis Artifacts</id>
                        <phase>package</phase>
                        <goals>
                            <goal>generate</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <!--允许移动生成的文件 -->
                    <verbose>true</verbose>
                    <!-- 是否覆盖 -->
                    <overwrite>true</overwrite>
                    <!-- 自动生成的配置 -->
                    <configurationFile>
                        src/main/resources/mybatis-generator.xml
                    </configurationFile>
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

OK，替换好后在idea的右下方会提示更新插件，更新。

我吗再去创建一个application文件，我一般喜欢用yml的格式 (复制粘贴的时候注意空格)

没用的文件夹我喜欢先删除，

server:
  port: 8080 #端口号


spring:
  datasource:
    name: mysql_test
    type: com.alibaba.druid.pool.DruidDataSource
    druid:
      filters: stat
      driver-class-name: com.mysql.jdbc.Driver
      url: jdbc:mysql://127.0.0.1:3306/test?useUnicode=true&characterEncoding=UTF-8&allowMultiQueries=true&serverTimezone=UTC #你的数据库
      username: root #你的账户
      password: root #你的密码
      initial-size: 1
      min-idle: 1
      max-active: 20
      max-wait: 60000
      time-between-eviction-runs-millis: 60000
      min-evictable-idle-time-millis: 300000
      validation-query: SELECT 'x'
      test-while-idle: true
      test-on-borrow: false
      test-on-return: false
      pool-prepared-statements: false
      max-pool-prepared-statement-per-connection-size: 20

mybatis:
  mapper-locations: classpath:mapping/*.xml #你的mybatis生成的xml文件
  type-aliases-package: com.cn.lx.entity #你的实体类


pagehelper:
  helperDialect: mysql
  reasonable: true
  supportMethodsArguments: true
  params: count=countSql
  returnPageInfo: check

在pom.xml中有个generator的生成我们去创建一下。

CV一波

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE generatorConfiguration
        PUBLIC "-//mybatis.org//DTD MyBatis Generator Configuration 1.0//EN"
        "http://mybatis.org/dtd/mybatis-generator-config_1_0.dtd">
<generatorConfiguration>

    <context id="DB2Tables"    targetRuntime="MyBatis3">
        <commentGenerator>
            <property name="suppressDate" value="true"/>
            <property name="suppressAllComments" value="true"/>
        </commentGenerator>
        <!--数据库链接地址账号密码-->
        <!--##需要修改-->
        <jdbcConnection driverClass="com.mysql.jdbc.Driver" connectionURL="jdbc:mysql://127.0.0.1:3306/test" userId="root" password="root">
        </jdbcConnection>
        <javaTypeResolver>
            <property name="forceBigDecimals" value="false"/>
        </javaTypeResolver>
        <!--生成Model类存放位置-->
        <javaModelGenerator targetPackage="com.cn.lx.entity" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
            <property name="trimStrings" value="true"/>
        </javaModelGenerator>
        <!--生成映射文件存放位置-->
        <sqlMapGenerator targetPackage="mapping" targetProject="src/main/resources">
            <property name="enableSubPackages" value="true"/>
        </sqlMapGenerator>
        <!--生成Dao类存放位置-->
        <!-- 客户端代码，生成易于使用的针对Model对象和XML配置文件 的代码
                type="ANNOTATEDMAPPER",生成Java Model 和基于注解的Mapper对象
                type="MIXEDMAPPER",生成基于注解的Java Model 和相应的Mapper对象
                type="XMLMAPPER",生成SQLMap XML文件和独立的Mapper接口
        -->
        <javaClientGenerator type="XMLMAPPER" targetPackage="com.cn.lx.dao" targetProject="src/main/java">
            <property name="enableSubPackages" value="true"/>
        </javaClientGenerator>
        <!--生成对应表及类名-->
        <table tableName="t_user" domainObjectName="User" enableCountByExample="false" enableUpdateByExample="false" enableDeleteByExample="false" enableSelectByExample="false" selectByExampleQueryId="false"></table>


    </context>
</generatorConfiguration>

我会在demo中放一个.sql的文件，到时候直接导入一下就OK了

使用generator自动生成。

OK生成成功。

接下来我们写一下service和controller 简单的测试一下。

创建好后再来一波cv

package com.cn.lx.service;

import com.cn.lx.entity.User;

public interface UserService {
     int add(User user);

     User queryById(Integer id);
}

package com.cn.lx.service.Impl;

import com.cn.lx.dao.UserMapper;
import com.cn.lx.entity.User;
import com.cn.lx.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service(value = "userService")
public class DefaultUserServiceImpl implements UserService {

    @Autowired
    private UserMapper userMapper;

    @Override
    public int add(User user) {
        return userMapper.insert(user);
    }

    @Override
    public User queryById(Integer id) {
        return userMapper.selectByPrimaryKey(id);
    }
}

package com.cn.lx.controller;

import com.cn.lx.entity.User;
import com.cn.lx.service.UserService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping(value = "/test/")
public class UserCotroller {

    @Autowired
    private UserService userService;

    @RequestMapping(value = "add",method = RequestMethod.POST)
    public int add(User user){
        return userService.add(user);
    }

    @RequestMapping(value = "queryUserInfo",method = RequestMethod.GET)
    public User queryUserInfo(@RequestParam(name = "id")Integer id){
        return userService.queryById(id);
    }
}