今天给大家分享纯注解版spring与mybatis的整合
mybatis包下：有这几个，上面图片没有展开
配置Bean：MyBatisAutoConfiguration
User
UserDAO
MybatisProperties
MyBatisAutoConfiguration：
package com.baizhiedu.mybatis;
import com.alibaba.druid.pool.DruidDataSource;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;
import javax.sql.DataSource;
import java.io.IOException;
@Configuration
@ComponentScan(basePackages = "com.baizhiedu.mybatis")
@MapperScan(basePackages = "com.baizhiedu.mybatis") //扫描dao接口对象
public class MyBatisAutoConfiguration {
//连接池对象
@Bean
public DataSource dataSource(){
DruidDataSource dataSource=new DruidDataSource();
dataSource.setDriverClassName("com.mysql.jdbc.Driver");
dataSource.setUrl("jdbc:mysql://localhost:3306/mybatis?useUnicode=true&charaterEcoding=utf-8");
dataSource.setUsername("root");
dataSource.setPassword("123456");
return dataSource;
}
//工厂对象
@Bean
public SqlSessionFactoryBean sqlSessionFactoryBean(DataSource dataSource){
SqlSessionFactoryBean sqlSessionFactoryBean=new SqlSessionFactoryBean();
sqlSessionFactoryBean.setDataSource(dataSource);
sqlSessionFactoryBean.setTypeAliasesPackage("com.baizhiedu.mybatis");
//设置Mapper文件的路径，这个只会 扫描一个Mapper文件，如果需要扫描多个文件，则需要让他扫描包
sqlSessionFactoryBean.setMapperLocations(new ClassPathResource("UserDAOMapper.xml"));
//通配写法让他扫描包下的所有Mapper文件资源
try {
ResourcePatternResolver resolver=new PathMatchingResourcePatternResolver();
Resource[] resources=resolver.getResources("com.baizhiedu.mapper/*Mapper.xml");
sqlSessionFactoryBean.setMapperLocations(resources);
} catch (IOException e) {
e.printStackTrace();
}
return sqlSessionFactoryBean;
}
}
User：
package com.baizhiedu.mybatis;
public class User {
private Integer id;
private String name;
private String password;
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 String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
UserDAO：
package com.baizhiedu.mybatis;
public interface UserDAO {
public void save(User user);
}
UserDAOMapper.xml：
insert into tb_users (name,password) values (#{name},#{password})
TestMyBatis：
package com.baizhiedu;
import com.baizhiedu.mybatis.MyBatisAutoConfiguration;
import com.baizhiedu.mybatis.User;
import com.baizhiedu.mybatis.UserDAO;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
public class TestMyBatis {
//用于测试Spring+Mybatis注解的整合
@Test
public void test1(){
ApplicationContext ctx=new AnnotationConfigApplicationContext(MyBatisAutoConfiguration.class);
UserDAO userDAO=(UserDAO)ctx.getBean("userDAO");
User user=new User();
user.setName("annotation1");
user.setPassword("123456");
userDAO.save(user);
}
}
上面配置Bean：MyBatisAutoConfiguration：存在数据耦合，可以通过配置文件来解耦合：
mybatis.properties：
mybatis.driverClassName=com.mysql.jdbc.Driver mybatis.url=jdbc:mysql://localhost:3306/mybatis?useUnicode=true&charaterEcoding=utf-8 mybatis.username=root mybatis.password=123456 mybatis.typeAliasesPackages=com.baizhiedu.mybatis mybatis.mapperLocations=com.baizhiedu.mapper/*Mapper.xml
定义类来封装配置文件中的配置信息:MybatisProperties:
package com.baizhiedu.mybatis;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.PropertySource;
import org.springframework.stereotype.Component;
@Component
@PropertySource("classpath:mybatis.properties") //读取配置文件
public class MybatisProperties {
@Value("${mybatis.driverClassName}")
private String driverClassName;
@Value("${mybatis.url}")
private String url;
@Value("${mybatis.username}")
private String username;
@Value("${mybatis.password}")
private String password;
@Value("${mybatis.typeAliasesPackages}")
private String typeAliasesPackages;
@Value("${mybatis.mapperLocations}")
private String mapperLocations;
public String getDriverClassName() {
return driverClassName;
}
public void setDriverClassName(String driverClassName) {
this.driverClassName = driverClassName;
}
public String getUrl() {
return url;
}
public void setUrl(String url) {
this.url = url;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getTypeAliasesPackages() {
return typeAliasesPackages;
}
public void setTypeAliasesPackages(String typeAliasesPackages) {
this.typeAliasesPackages = typeAliasesPackages;
}
public String getMapperLocations() {
return mapperLocations;
}
public void setMapperLocations(String mapperLocations) {
this.mapperLocations = mapperLocations;
}
}
更改配置MyBatisAutoConfiguration:
package com.baizhiedu.mybatis;
import com.alibaba.druid.pool.DruidDataSource;
import org.mybatis.spring.SqlSessionFactoryBean;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.ClassPathResource;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;
import javax.sql.DataSource;
import java.io.IOException;
@Configuration
@ComponentScan(basePackages = "com.baizhiedu.mybatis")
@MapperScan(basePackages = "com.baizhiedu.mybatis") //扫描dao接口对象
public class MyBatisAutoConfiguration {
@Autowired //注解 自定义类型注入，用来解耦合
private MybatisProperties mybatisProperties;
//连接池对象
@Bean
public DataSource dataSource(){
DruidDataSource dataSource=new DruidDataSource();
dataSource.setDriverClassName(mybatisProperties.getDriverClassName());
dataSource.setUrl(mybatisProperties.getUrl());
dataSource.setUsername(mybatisProperties.getUsername());
dataSource.setPassword(mybatisProperties.getPassword());
return dataSource;
}
//工厂对象
@Bean
public SqlSessionFactoryBean sqlSessionFactoryBean(DataSource dataSource){
SqlSessionFactoryBean sqlSessionFactoryBean=new SqlSessionFactoryBean();
sqlSessionFactoryBean.setDataSource(dataSource);
sqlSessionFactoryBean.setTypeAliasesPackage(mybatisProperties.getTypeAliasesPackages());
//设置Mapper文件的路径，这个只会 扫描一个Mapper文件，如果需要扫描多个文件，则需要让他扫描包
sqlSessionFactoryBean.setMapperLocations(new ClassPathResource("UserDAOMapper.xml"));
//通配写法让他扫描包下的所有Mapper文件资源
try {
ResourcePatternResolver resolver=new PathMatchingResourcePatternResolver();
Resource[] resources=resolver.getResources(mybatisProperties.getMapperLocations());
sqlSessionFactoryBean.setMapperLocations(resources);
} catch (IOException e) {
e.printStackTrace();
}
return sqlSessionFactoryBean;
}
}
TestMyBatis：test：
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