**5.1 SpringBoot****整合****Mybatis**
**5.1.1** **添加****Mybatis****的起步依赖**
**5.1.2** **添加数据库驱动坐标**
**5.1.3** **添加数据库连接信息**
在application.properties中添加数据量的连接信息
**5.1.4** **创建****user****表**
\<!--mybatis起步依赖--\>
\<dependency\>
\<groupId\>org.mybatis.spring.boot\</groupId\>
\<artifactId\>mybatis-spring-boot-starter\</artifactId\>
\<version\>1.1.1\</version\>
\</dependency\>
\<!-- MySQL连接驱动 --\>
\<dependency\>
\<groupId\>mysql\</groupId\>
\<artifactId\>mysql-connector-java\</artifactId\>
\</dependency\>
#DB Configuration:
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test?
useUnicode=true&characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=root

在test数据库中创建user表
**5.1.5** **创建实体****Bean**
**5.1.6** **编写****Mapper**
注意：@Mapper标记该类是一个mybatis的mapper接口，可以被spring boot自动扫描到spring上下文中
**5.1.7** **配置****Mapper****映射文件**
在src\main\resources\mapper路径下加入UserMapper.xml配置文件"
-- ----------------------------
-- Table structure for `user`
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(50) DEFAULT NULL,
`password` varchar(50) DEFAULT NULL,
`name` varchar(50) DEFAULT NULL,
PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=10 DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES ('1', 'zhangsan', '123', '张三');
INSERT INTO `user` VALUES ('2', 'lisi', '123', '李四');
public class User {
// 主键
private Long id;
// 用户名
private String username;
// 密码
private String password;
// 姓名
private String name;
//此处省略getter和setter方法 .. ..
}
@Mapper
public interface UserMapper {
public List\<User\> queryUserList();
}

**5.1.8** **在****application.properties****中添加****mybatis****的信息**
**5.1.9** **编写测试****Controller**
**5.1.10** **测试**
**5.2 SpringBoot****整合****Junit**
**5.2.1** **添加****Junit****的起步依赖**
\<?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](http://mybatis.org/dtd/mybatis-3-mapper.dtd)" \>
\<mapper namespace="com.itheima.mapper.UserMapper"\>
\<select id="queryUserList" resultType="user"\>
select * from user
\</select\>
\</mapper\>
#spring集成Mybatis环境
#pojo别名扫描包
mybatis.type-aliases-package=com.itheima.domain
#加载Mybatis映射文件
mybatis.mapper-locations=classpath:mapper/*Mapper.xml
@Controller
public class MapperController {
@Autowired
private UserMapper userMapper;
@RequestMapping("/queryUser")
@ResponseBody
public List\<User\> queryUser(){
List\<User\> users = userMapper.queryUserList();
return users;
}
}
**5.2.2** **编写测试类**
其中，
SpringRunner继承自SpringJUnit4ClassRunner，使用哪一个Spring提供的测试测试引擎都可以
@SpringBootTest的属性指定的是引导类的字节码对象
**5.2.3** **控制台打印信息**
\<!--测试的起步依赖--\>
\<dependency\>
\<groupId\>org.springframework.boot\</groupId\>
\<artifactId\>spring-boot-starter-test\</artifactId\>
\<scope\>test\</scope\>
\</dependency\>
package com.itheima.test;
import com.itheima.MySpringBootApplication;
import com.itheima.domain.User;
import com.itheima.mapper.UserMapper;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
import java.util.List;
@RunWith(SpringRunner.class)
@SpringBootTest(classes = MySpringBootApplication.class)
public class MapperTest {
@Autowired
private UserMapper userMapper;
@Test
public void test() {
List\<User\> users = userMapper.queryUserList();
System.out.println(users);
}
}
public final class SpringRunner extends SpringJUnit4ClassRunner
**5.3 SpringBoot****整合****Spring Data JPA**
**5.3.1** **添加****Spring Data JPA****的起步依赖**
**5.3.2** **添加数据库驱动依赖**
**5.3.3** **在****application.properties****中配置数据库和****jpa****的相关属性**
**5.3.4** **创建实体配置实体**
\<!-- springBoot JPA的起步依赖 --\>
\<dependency\>
\<groupId\>org.springframework.boot\</groupId\>
\<artifactId\>spring-boot-starter-data-jpa\</artifactId\>
\</dependency\>
\<!-- MySQL连接驱动 --\>
\<dependency\>
\<groupId\>mysql\</groupId\>
\<artifactId\>mysql-connector-java\</artifactId\>
\</dependency\>
#DB Configuration:
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/test?
useUnicode=true&characterEncoding=utf8
spring.datasource.username=root
spring.datasource.password=root
#JPA Configuration:
spring.jpa.database=MySQL
spring.jpa.show-sql=true
spring.jpa.generate-ddl=true
spring.jpa.hibernate.ddl-auto=update
spring.jpa.hibernate.naming_strategy=org.hibernate.cfg.ImprovedNamingStrategy
@Entity
**5.3.5** **编写****UserRepository**
**5.3.6** **编写测试类**
**5.3.7** **控制台打印信息**
注意：如果是jdk9，执行报错如下：
public class User {
// 主键
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
// 用户名
private String username;
// 密码
private String password;
// 姓名
private String name;
//此处省略setter和getter方法... ...
}
public interface UserRepository extends JpaRepository\<User,Long\>{
public List\<User\> findAll();
}
@RunWith(SpringRunner.class)
@SpringBootTest(classes=MySpringBootApplication.class)
public class JpaTest {
@Autowired
private UserRepository userRepository;
@Test
public void test(){
List\<User\> users = userRepository.findAll();
System.out.println(users);
}
}
原因：jdk缺少相应的jar
解决方案：手动导入对应的maven坐标，如下：
**5.4 SpringBoot****整合****Redis**
**5.4.1** **添加****redis****的起步依赖**
**5.4.2** **配置****redis****的连接信息**
**5.4.3** **注入****RedisTemplate****测试****redis****操作**
\<!--jdk9需要导入如下坐标--\>
\<dependency\>
\<groupId\>javax.xml.bind\</groupId\>
\<artifactId\>jaxb-api\</artifactId\>
\<version\>2.3.0\</version\>
\</dependency\>
\<!-- 配置使用redis启动器 --\>
\<dependency\>
\<groupId\>org.springframework.boot\</groupId\>
\<artifactId\>spring-boot-starter-data-redis\</artifactId\>
\</dependency\>
#Redis
spring.redis.host=127.0.0.1
spring.redis.port=6379
@RunWith(SpringRunner.class)
@SpringBootTest(classes = SpringbootJpaApplication.class)
public class RedisTest {
@Autowired
private UserRepository userRepository;
@Autowired
private RedisTemplate\<String, String\> redisTemplate;
@Test
public void test() throws JsonProcessingException {
//从redis缓存中获得指定的数据
String userListData = redisTemplate.boundValueOps("user.findAll").get();
//如果redis中没有数据的话
if(null==userListData){
//查询数据库获得数据
List\<User\> all = userRepository.findAll();
//转换成json格式字符串
ObjectMapper om = new ObjectMapper();
userListData = om.writeValueAsString(all);
//将数据存储到redis中，下次在查询直接从redis中获得数据，不用在查询数据库
redisTemplate.boundValueOps("user.findAll").set(userListData);
System.out.println("===============从数据库获得数据===============");
}else{
System.out.println("===============从redis缓存中获得数据===============");
}
System.out.println(userListData);
}
}