Spring通过注解整合MyBatis的步骤，共五步
Spring整合MyBatis
先看图，项目包含什么类
共五步
一、导包（简单）
**注意，Mybatis包的版本不能错 !!! 这两个包的版本不要换 。 其他的包应该可以选其他版本 =_= **
MyBatis、Spring、Mysql、Junit 。
MyBatis的包
<dependency>
<groupId>org.mybatisgroupId>
<artifactId>mybatisartifactId>
<version>3.5.6version>
dependency>
<dependency>
<groupId>org.mybatisgroupId>
<artifactId>mybatis-springartifactId>
<version>1.3.0version>
dependency>
Spring的包
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-contextartifactId>
<version>5.2.10.RELEASEversion>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-jdbcartifactId>
<version>5.2.10.RELEASEversion>
dependency>
<dependency>
<groupId>org.springframeworkgroupId>
<artifactId>spring-testartifactId>
<version>5.2.10.RELEASEversion>
dependency>
数据库相关的包
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
<version>5.1.47version>
dependency>
<dependency>
<groupId>com.alibabagroupId>
<artifactId>druidartifactId>
<version>1.1.16version>
dependency>
Junit的包
<dependency>
<groupId>junitgroupId>
<artifactId>junitartifactId>
<version>4.12version>
<scope>testscope>
dependency>
第一部分完
二、注解配置类（中等）
1. 三个配置类
2. 属性文件
jdbc.driver=com.mysql.jdbc.Driver
jdbc.url=jdbc:mysql://localhost:3306/userdb?characterEncoding=utf8&useSSL=false&serverTimezone=UTC&rewriteBatchedStatements=true
jdbc.username=root
jdbc.password=123456
SpringConfig类 - 主配置
这个注解是给JdbcConfig类用的：@PropertySource(“jdbc.properties”)
package com.zrh.config;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.PropertySource;
import org.springframework.context.annotation.Import;
@Configuration
@ComponentScan("com.zrh")
@PropertySource("jdbc.properties") // 引用属性文件
@Import({JdbcConfig.class,MybatisConfig.class})
public class SpringConfig {
}
JdbcConfig类
类的属性上用到了注解：@Value(“${jdbc.driver}”)，意思是引用了属性文件中的值
package com.zrh.config;
import com.alibaba.druid.pool.DruidDataSource;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import javax.sql.DataSource;
public class JdbcConfig {
@Value("${jdbc.driver}")
private String driver;
@Value("${jdbc.url}")
private String url;
@Value("${jdbc.username}")
private String username;
@Value("${jdbc.password}")
private String password;
@Bean
public DataSource dataSource() {
DruidDataSource dataSource = new DruidDataSource();
dataSource.setDriverClassName(driver);
dataSource.setUrl(url);
dataSource.setUsername(username);
dataSource.setPassword(password);
return dataSource;
}
}
MybatisConfig类
package com.zrh.config;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.mapper.MapperScannerConfigurer;
import org.springframework.context.annotation.Bean;
import javax.sql.DataSource;
public class MybatisConfig {
@Bean
public SqlSessionFactoryBean sqlSessionFactory(DataSource dataSource) {
SqlSessionFactoryBean ssfb = new SqlSessionFactoryBean();
ssfb.setTypeAliasesPackage("com.zrh.domain");
ssfb.setDataSource(dataSource);
return ssfb; // 注意不要写成 return null;
}
@Bean
public MapperScannerConfigurer mapperScannerConfigurer() {
MapperScannerConfigurer msc = new MapperScannerConfigurer();
msc.setBasePackage("com.zrh.dao");
return msc;
}
}
第二部分完
三、创建表和实体类（简单）
创建表 - 图
在MySQL中创建表，并写上一两个记录。
表结构
表记录
创建实体类 - 图文
实体类属性要对应表的每个字段
package com.zrh.domain;
public class Account {
Integer id;
String name;
Integer money;
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getMoney() {
return money;
}
public void setMoney(Integer money) {
this.money = money;
}
public Account(Integer id, String name, Integer money) {
this.id = id;
this.name = name;
this.money = money;
}
@Override
public String toString() {
return "Account{" +
"id=" + id +
", name='" + name + '\'' +
", money=" + money +
'}';
}
}
第三部分完
四、数据层和业务层（中等）
数据层
Dao层只需要一个接口，它的五个方法，通过注解实现
package com.zrh.dao;
import com.zrh.domain.Account;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
import java.util.List;
public interface AccountDao {
@Insert("insert into table_account(name,money)values(#{name},#{money})")
void save(Account account);
@Delete("delete from table_account where id = #{id}")
void delete(Integer id);
@Update("update table_account set name = #{name}, money = #{money} where id = #{id}")
void update(Account account);
@Select("select * from table_account")
List<Account> findAll();
@Select("select * from table_account where id = #{id}")
Account findById(Integer id);
}
业务层
接口
package com.zrh.service;
import com.zrh.domain.Account;
import java.util.List;
public interface AccountService {
void save(Account account);
void delete(Integer id);
void update(Account account);
List<Account> findAll();
Account findById(Integer id);
}
接口实现类
package com.zrh.service.impl;
import com.zrh.dao.AccountDao;
import com.zrh.domain.Account;
import com.zrh.service.AccountService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service("accountService") //写不写Bean的名字无所谓
public class AccountServiceImpl implements AccountService {
@Autowired
private AccountDao accountDao;
@Override
public void save(Account account) {
accountDao.save(account);
}
@Override
public void delete(Integer id) {
accountDao.delete(id);
}
@Override
public void update(Account account) {
accountDao.update(account);
}
@Override
public List<Account> findAll() {
return accountDao.findAll();
}
@Override
public Account findById(Integer id) {
return accountDao.findById(id);
}
}
第四部分完
五、APP程序类（简单）
写完这个可以运行了。
import com.zrh.config.SpringConfig;
import com.zrh.domain.Account;
import com.zrh.service.AccountService;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class App2 {
public static void main(String[] args) {
ApplicationContext ctx = new AnnotationConfigApplicationContext(SpringConfig.class);
AccountService accountService = ctx.getBean(AccountService.class);
Account ac = accountService.findById(2);
System.out.println(ac);
}
}
Spring注解整合MyBatis的全部步骤，完成
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拓展
测试类（简单）
用来测试业务层方法
package com.zrh.service;
import com.zrh.config.SpringConfig;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.ContextConfiguration;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(classes = SpringConfig.class)
public class AccountServiceTest {
@Autowired
private AccountService accountService;
@Test
public void testFindById() {
System.out.println(accountService.findById(1));
}
@Test
public void testFindAll() {
System.out.println(accountService.findAll());
}
}