springboot 2.0 集成 mybatis-plus

首先说一个要点,由于 springboot 自带了 jackson 包,所以 pom 文件里不能导入任何 jackson 包,

否则会重复导入,导致 ClassNotFountException 

项目结构 springboot 2.0  mysql 5.7 druid 1.0.18 

导入mybatis-plus的jar包

<?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>cn.sifangyuan</groupId>
    <artifactId>infosystem</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>war</packaging>

    <name>infosystem</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </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-redis</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>1.3.2</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-tomcat</artifactId>
            <scope>provided</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-logging</artifactId>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.0.18</version>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
            <!-- 表示开发的时候引入，发布的时候不会加载此包 -->
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus</artifactId>
            <version>2.3</version>
        </dependency>
        <!-- 模板引擎 -->
        <dependency>
            <groupId>org.apache.velocity</groupId>
            <artifactId>velocity-engine-core</artifactId>
            <version>2.0</version>
        </dependency>

        <!-- 格式化对象，方便输出日志 -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.1.41</version>
        </dependency>

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-api</artifactId>
            <version>1.7.7</version>
        </dependency>

        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.7</version>
        </dependency>
        <!-- log end -->
        <!-- pinyin4j -->
        <dependency>
            <groupId>com.belerweb</groupId>
            <artifactId>pinyin4j</artifactId>
            <version>2.5.0</version>
        </dependency>

        <!-- 上传组件包 -->
        <dependency>
            <groupId>commons-fileupload</groupId>
            <artifactId>commons-fileupload</artifactId>
            <version>1.3.1</version>
        </dependency>
        <dependency>
            <groupId>commons-io</groupId>
            <artifactId>commons-io</artifactId>
            <version>2.4</version>
        </dependency>
        <dependency>
            <groupId>commons-codec</groupId>
            <artifactId>commons-codec</artifactId>
            <version>1.9</version>
        </dependency>
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-core</artifactId>
            <version>2.1.6</version>
        </dependency>
        <!-- 必须放在最下面 -->
        <dependency>
            <groupId>com.baomidou</groupId>
            <artifactId>mybatis-plus-boot-starter</artifactId>
            <version>2.3</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <!--该插件的主要功能是进行项目的打包发布处理-->
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

application.yml

#服务端口
server:
  port: 8090
#项目contextPath
  servlet:
    context-path: /******

#tomcat最大线程数，默认为200
  tomcat:
    max-threads: 100
#tomcat的URI编码
    uri-encoding: UTF-8
##数据库连接信息
spring:
  datasource:
    url: jdbc:mysql://*******:3306/********?useUnicode=true&characterEncoding=UTF-8
    username: ******
    password: ******
    driver-class-name: com.mysql.jdbc.Driver
    platform: mysql
###################以下为druid增加的配置###########################
    type: com.alibaba.druid.pool.DruidDataSource
# 下面为连接池的补充设置，应用到上面所有数据源中
# 初始化大小，最小，最大\
    initialSize: 5
    minIdle: 5
    maxActive: 20
# 配置获取连接等待超时的时间
    maxWait: 60000
# 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
    timeBetweenEvictionRunsMillis: 60000
# 配置一个连接在池中最小生存的时间，单位是毫秒
    minEvictableIdleTimeMillis: 300000
    validationQuery: SELECT 1 FROM DUAL
    testWhileIdle: true
    testOnBorrow: false
    testOnReturn: false
# 打开PSCache，并且指定每个连接上PSCache的大小
    poolPreparedStatements: true
    maxPoolPreparedStatementPerConnectionSize: 20
# 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
    filters: stat,wall,log4j
# 通过connectProperties属性来打开mergeSql功能；慢SQL记录
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
# 合并多个DruidDataSource的监控数据
#spring.datasource.useGlobalDataSourceStat=true
###############以上为配置druid添加的配置########################################

# 如果是放在src/main/java目录下 classpath:/com/yourpackage/*/mapper/*Mapper.xml
# 如果是放在resource目录 classpath:/mapper/*Mapper.xml
mybatis-plus:
  mapper-locations: classpath:/mappers/*Mapper.xml
#实体扫描，多个package用逗号或者分号分隔
  typeAliasesPackage: ***.*****.entity

#主键类型  0:"数据库ID自增", 1:"用户输入ID",2:"全局唯一ID (数字类型唯一ID)", 3:"全局唯一ID UUID";
  global-config:
      id-type: 0
      #字段策略 0:"忽略判断",1:"非 NULL 判断"),2:"非空判断"
      field-strategy: 2
      #驼峰下划线转换
      db-column-underline: false
      #刷新mapper 调试神器
      refresh-mapper: true
      #数据库大写下划线转换
      #capital-mode: true
      #逻辑删除配置（下面3个配置）
      sql-injector: com.baomidou.mybatisplus.mapper.LogicSqlInjector
      logic-delete-value: 1
      logic-not-delete-value: 0
  configuration:
    #配置返回数据库(column下划线命名&&返回java实体是驼峰命名)，自动匹配无需as（没开启这个，SQL需要写as： select user_id as userId）
    map-underscore-to-camel-case: false
    cache-enabled: false

mybatis-plus配置类 MybatisPlusConfig.java

@Configuration
@MapperScan("***.******.mapper*")
public class MybatisPlusConfig {

    /*
     * 分页插件，自动识别数据库类型
     * 多租户，请参考官网【插件扩展】
     */
    @Bean
    public PaginationInterceptor paginationInterceptor() {
        PaginationInterceptor page = new PaginationInterceptor();
        page.setDialectType("mysql");
        return page;
    }
    /**
     * SQL执行效率插件
     */
    @Bean
    public PerformanceInterceptor performanceInterceptor() {
        return new PerformanceInterceptor();
    }

}

连接池droid配置 DataSourceConfig.java

/**
 * 数据源配置
 */
@Configuration
public class DataSourceConfig {

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

    // 配置事物管理器
    @Bean(name="transactionManager")
    public DataSourceTransactionManager transactionManager(){
        return new DataSourceTransactionManager(dataSource());
    }

}

启动类 Application.java

@EnableTransactionManagement
@SpringBootApplication
@ComponentScan(basePackages = {
        "**.***.conf",
        "**.***.web",
        "**.***.service"})
public class InfosystemApplication {

    public static void main(String[] args) {
        SpringApplication.run(InfosystemApplication.class, args);
        System.out.println("=================启动成功==================");
    }
}