首先整合Mybatis

* 添加mybatis的起步依赖

<!--mybatis起步依赖-->
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>1.1.1</version>
</dependency>

* 添加数据库驱动坐标 

<!-- MySQL连接驱动 -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>

* 添加数据库连接信息

<!-- MySQL连接驱动 -->
#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=ok

* 创建实体Bean

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 .. ..
}

* 编写Mapper

@Mapper
public interface UserMapper {
public List<User> queryUserList();
}

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

*  配置Mapper映射文件
*  在src\main\resources\mapper路径下加入UserMapper.xml配置文件"

<?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" >
<mapper namespace="com.zb.mapper..UserMapper"
<select id="queryUserList" resultType="user">
select * from user
</select>
</mapper>

* 在application.properties中添加mybatis的信息

#spring集成Mybatis环境
#pojo别名扫描包
mybatis.type-aliases-package=com.zb.domain
#加载Mybatis映射文件
mybatis.mapper-locations=classpath:mapper/*Mapper.xml

* 编写测试Controller

@Controller
public class MapperController {
@Autowired
private UserMapper userMapper;
@RequestMapping("/queryUser")
@ResponseBody
public List<User> queryUser(){
List<User> users = userMapper.queryUserList();
return users;
}
}

* 测试

到此整合 Mybatis 完成

SpringBoot整合Junit

* 添加Junit的起步依赖

<!--测试的起步依赖-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>

* 编写测试类

package com.zb.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;
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);
}
}

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

public final class SpringRunner extends SpringJUnit4ClassRunner

控制台打印信息

到此整合 Mybatis 完成

SpringBoot整合Spring Data JPA

* 添加Spring Data JPA的起步依赖

<!-- springBoot JPA的起步依赖 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

* 在application.properties中配置数据库和jpa的相关属性

#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

* 创建实体配置实体

@Entity
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... ...
}

* 编写UserRepository

@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);
    }

}

*  控制台打印信息

注意：如果是jdk9，执行报错如下：

<!--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>

到此整合 JPA 完成

SpringBoot整合Redis

* 添加redis的起步依赖

<!-- 配置使用redis启动器 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

* 配置redis的连接信息

#Redis
spring.redis.host=127.0.0.1
spring.redis.port=6379

*  注入RedisTemplate测试redis操作

@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);

    }

}

记录一下