1. pom.xml

<?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.gblfy</groupId><artifactId>spring-mybatisplus</artifactId><version>1.0-SNAPSHOT</version><packaging>war</packaging><name>spring-mybatisplus</name><url>http://www.gblfy.com</url><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><maven.compiler.source>1.7</maven.compiler.source><maven.compiler.target>1.7</maven.compiler.target></properties><dependencies><dependency><groupId>com.baomidou</groupId><artifactId>mybatis-plus</artifactId><version>3.3.1.tmp</version></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.11</version><scope>test</scope></dependency><!-- log4j --><dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>1.2.17</version></dependency><!-- c3p0 --><dependency><groupId>com.mchange</groupId><artifactId>c3p0</artifactId><version>0.9.5.2</version></dependency><!-- mysql --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.19</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.12</version><scope>provided</scope></dependency><!-- spring --><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>4.3.10.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-orm</artifactId><version>4.3.10.RELEASE</version></dependency></dependencies></project>

2. 实体类

package com.gblfy.entity;import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableName;
import com.baomidou.mybatisplus.extension.activerecord.Model;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;@Data
@AllArgsConstructor
@NoArgsConstructor
@Builder
@TableName("user")
public class User extends Model<User> {/*** 主键ID*/private Long id;/*** 姓名*/private String name;/*** 年龄*/private Integer age;/*** 邮箱*/private String email;//数据库没有此字段 只为了封装演示@TableField(exist = false)private String remark;
}

3. mapper接口

package com.gblfy.mapper;import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.gblfy.entity.User;public interface UserMapper extends BaseMapper<User> {
}

resources配置以下几个配置文件：

4. applicationContext.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:context="http://www.springframework.org/schema/context"xmlns:tx="http://www.springframework.org/schema/tx"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsdhttp://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.0.xsd"><!-- 数据源 --><context:property-placeholder location="classpath:db.properties"/><bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"><property name="driverClass" value="${jdbc.driver}"></property><property name="jdbcUrl" value="${jdbc.url}"></property><property name="user" value="${jdbc.username}"></property><property name="password" value="${jdbc.password}"></property></bean><!-- 事务管理器 --><bean id="dataSourceTransactionManager"class="org.springframework.jdbc.datasource.DataSourceTransactionManager"><property name="dataSource" ref="dataSource"></property></bean><!-- 基于注解的事务管理 --><tx:annotation-driven transaction-manager="dataSourceTransactionManager"/><bean id="sqlSessionFactoryBean" class="com.baomidou.mybatisplus.extension.spring.MybatisSqlSessionFactoryBean"><!-- 数据源 --><property name="dataSource" ref="dataSource"></property><property name="configLocation" value="classpath:mybatis-config.xml"></property></bean><!--配置mybatis 扫描mapper接口的路径--><bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"><property name="basePackage" value="com.gblfy.mapper"/></bean>
</beans>

5. db.properties

#数据库配置
jdbc.driver=com.mysql.cj.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/ssm?useSSL=false&serverTimezone=GMT%2B8
jdbc.username=root
jdbc.password=root

6. log4j.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"><log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/"><appender name="STDOUT" class="org.apache.log4j.ConsoleAppender"><param name="Encoding" value="UTF-8" /><layout class="org.apache.log4j.PatternLayout"><param name="ConversionPattern" value="%-5p %d{MM-dd HH:mm:ss,SSS} %m  (%F:%L) \n" /></layout></appender><logger name="java.sql"><level value="debug" /></logger><logger name="org.apache.ibatis"><level value="info" /></logger><root><level value="debug" /><appender-ref ref="STDOUT" /></root>
</log4j:configuration>

7. mybatis-config.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration></configuration>

8. 测试类

package com.gblfy.mapper;import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.gblfy.entity.User;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;import javax.sql.DataSource;
import java.sql.Connection;
import java.util.List;public class UserMapperTest {private ApplicationContext ioc =new ClassPathXmlApplicationContext("applicationContext.xml");/*** 从ioc容器中，获取employeeMapper具体的代理实现类对象*/private UserMapper userMapper =ioc.getBean("userMapper", UserMapper.class);/*** 通用 查询操作*/@Testpublic void testSelect() {List<User> userList = userMapper.selectList(new QueryWrapper<User>());System.out.println(userList);}/*** mybatis 和 sprng集成测试类*测试项目和数据库的连通性* @throws Exception*/@Testpublic void testDataSource() throws Exception {DataSource ds = ioc.getBean("dataSource", DataSource.class);System.out.println(ds);Connection conn = ds.getConnection();System.out.println(conn);}
}

9. 控制台输出

[User(id=1, name=Jone, age=18, email=test1@baomidou.com, remark=null), User(id=2, name=Jack, age=20, email=test2@baomidou.com, remark=null), User(id=3, name=Tom, age=28, email=test3@baomidou.com, remark=null), User(id=4, name=郭轩, age=26, email=test4@baomidou.com, remark=null), User(id=5, name=郭振, age=26, email=test5@baomidou.com, remark=null), User(id=1238735228017610754, name=郭雨昕, age=2, email=gblfy@qq.com, remark=null), User(id=1238735794525503489, name=郭雨泽, age=22, email=gblfy@qq.com, remark=null)]

10. 源码地址

https://gitee.com/gb_90/ssm-upgrade