springboot简单集成mybatis和druid数据源

1. 千篇一律，首先导入jar包

<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
       <dependency>
            <groupId>log4j</groupId>
            <artifactId>log4j</artifactId>
            <version>1.2.17</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.10</version>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.1.1</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>

2.写配置

• 准备application.yml配置

spring:
  datasource:
    username: root
    password: 123456
    url: jdbc:mysql://127.0.0.1:3306/lenos?useUnicode=true&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=UTC
    driver-class-name: com.mysql.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource


#    #Spring Boot 默认是不注入这些属性值的，需要自己绑定
#    #druid 数据源专有配置
    initialSize: 5
    minIdle: 5
    maxActive: 20
    maxWait: 60000
    timeBetweenEvictionRunsMillis: 60000
    minEvictableIdleTimeMillis: 300000
    validationQuery: SELECT 1 FROM DUAL
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
    poolPreparedStatements: true

    #配置监控统计拦截的filters，stat:监控统计、log4j：日志记录、wall：防御sql注入
    #如果允许时报错  java.lang.ClassNotFoundException: org.apache.log4j.Priority
    #则导入 log4j 依赖即可，Maven 地址： https://mvnrepository.com/artifact/log4j/log4j
    filters: stat,wall,log4j
    maxPoolPreparedStatementPerConnectionSize: 20
    useGlobalDataSourceStat: true
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500

#配置mybatis
#指定myBatis的核心配置文件与Mapper映射文件
mybatis:
  mapper-locations: classpath:mapper/*.xml
  ## 注意：对应实体类的路径
  type-aliases-package: com.example.demo.pojo

• 准备Druid配置类

package com.example.demo.config;

import com.alibaba.druid.pool.DruidDataSource;
import com.alibaba.druid.support.http.StatViewServlet;
import com.alibaba.druid.support.http.WebStatFilter;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import javax.sql.DataSource;
import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

@Configuration
public class DruidConfig {


    @ConfigurationProperties(prefix = "spring.datasource")
    @Bean
    public DataSource druidDataSource(){
        return  new DruidDataSource();
    }


    //后台监控
    @Bean
    public ServletRegistrationBean statViewServlet(){
        ServletRegistrationBean<StatViewServlet> bean =  new ServletRegistrationBean<>(new StatViewServlet(),"/druid/*");

        //后台需要人登陆，配置账号和密码
        Map<String, String> initParameters = new HashMap<String, String>();
        //增加配置
        initParameters.put("loginUsername","admin");
        //登陆的key 固定为 loginUsername/loginPassword
        initParameters.put("loginPassword","123456");
        //允许谁可以访问
        initParameters.put("allow","");
		//不允许访问的格式
		// initParameters.put("zy","192.1.168.1");
        bean.setInitParameters(initParameters);
        return bean;
    }

    @Bean
    public FilterRegistrationBean webStatFilter() {
        FilterRegistrationBean bean = new FilterRegistrationBean();
        bean.setFilter(new WebStatFilter());

        //exclusions：设置哪些请求进行过滤排除掉，从而不进行统计
        Map<String, String> initParams = new HashMap<>();
        initParams.put("exclusions", "*.js,*.css,/druid/*");
        bean.setInitParameters(initParams);
        //"/*" 表示过滤所有请求
        bean.setUrlPatterns(Arrays.asList("/*"));
        return bean;
    }
}

• 准备mybatis配置，我这边为了方便就没有写三层了

package com.example.demo.mapper;

import com.example.demo.pojo.Person;
import org.apache.ibatis.annotations.Mapper;
import org.springframework.stereotype.Repository;

import java.util.List;

@Mapper
@Repository
public interface UserMapper {
    //查询全部用户
    List<Person> selectAllPerson();
    //根据id查询用户
    Person selectPersonById(int id);
    //添加一个用户
    int addPerson(Person person);
    //修改一个用户
    int updatePerson(Person person);
    //根据id删除用户
    int deletePerson(int id);
}

接口配置完毕，接着就是sql语句。

<?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.example.demo.mapper.UserMapper">

    <select id="selectAllPerson" resultType="Person">
        select * from test
    </select>

    <select id="selectPersonById" resultType="Person">
        select * from test where id = #{id}
    </select>

    <insert id="addPerson" parameterType="Person">
        insert into test (name,age) values (#{name},#{age})
    </insert>

    <update id="updatePerson" parameterType="Person">
        update test set name=#{name},age=#{age} where id = #{id}
    </update>

    <delete id="deletePerson" parameterType="int">
        delete from test where id = #{id}
    </delete>
</mapper>

注意：application里面的配置要与实际的xml存放路径一致，否则会报错。

实体类在这边就不体现了，到此准备完毕，开始测试。
首先访问druid的监控后台页面访问：ip/端口/druid/index.html

接着登录即可。mybatis的测试简单，只要写个cotroller调用接口就可以了。
一个简单的集成就好了。