SpringBoot学习3-SpringBoot与整合其他技术

发表于
字数统计 1.3k | 阅读时长 6

1. SpringBoot整合Mybatis

1.1 添加Mybatis的起步依赖

1
2
3
4
5
6
<!--mybatis起步依赖-->
<dependency>
    <groupId>org.mybatis.spring.boot</groupId>
    <artifactId>mybatis-spring-boot-starter</artifactId>
    <version>1.1.1</version>
</dependency>

1.2 添加数据库驱动坐标

1
2
3
4
5
<!-- MySQL连接驱动 -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>

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

1
2
3
4
5
#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

1.4 创建user表

在test数据库中创建user表

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
-- ----------------------------
-- 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');

1.5 创建实体Bean

1
2
3
4
5
6
7
8
9
10
11
12
13
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 .. ..
    
}

1.6 编写Mapper

1
2
3
4
@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

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”

1
2
3
4
5
6
7
<?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.itheima.mapper.UserMapper">
    <select id="queryUserList" resultType="user">
        select * from user
    </select>
</mapper>

1.8 在application.properties中添加mybatis的信息

1
2
3
4
5
#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

1.9 编写测试Controller

1
2
3
4
5
6
7
8
9
10
11
12
13
14
@Controller
public class MapperController {

    @Autowired
    private UserMapper userMapper;

    @RequestMapping("/queryUser")
    @ResponseBody
    public List<User> queryUser(){
        List<User> users = userMapper.queryUserList();
        return users;
    }

}

1.10 测试

2 .SpringBoot整合Junit

2.1 添加Junit的起步依赖

1
2
3
4
5
6
<!--测试的起步依赖-->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-test</artifactId>
    <scope>test</scope>
</dependency>

2.2 编写测试类

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
package com.gsynf;

import com.gsynf.domain.User;
import com.gsynf.mapper.UserMapper;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit.jupiter.SpringExtension;

import java.util.List;


/**
 * @ClassName: MybatisTest
 * @Description: 测试mybatis
 */
@ExtendWith(SpringExtension.class)
@SpringBootTest(classes = Springboot03mybatisApplication.class)
public class MybatisTest {

    @Autowired
    private UserMapper userMapper;
    @Test
    public void test() {
        List<User> users = userMapper.queryUserList();
        System.out.println(users);
    }
}

其中，@SpringBootTest的属性指定的是引导类的字节码对象

2.3 控制台打印信息

3. SpringBoot整合Spring Data JPA

3.1 添加Spring Data JPA的起步依赖

1
2
3
4
5
<!-- springBoot JPA的起步依赖 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>

3.2 添加数据库驱动依赖

1
2
3
4
5
<!-- MySQL连接驱动 -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>

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

1
2
3
4
5
6
7
8
9
10
11
12
#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

3.4 创建实体配置实体

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
@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... ...
}

3.5 编写UserRepository

1
2
3
public interface UserRepository extends JpaRepository<User,Long>{
    public List<User> findAll();
}

3.6 编写测试类

1
2
3
4
5
6
7
8
9
10
11
12
13
14
@ExtendWith(SpringExtension.class)
@SpringBootTest(classes = Springboot04jpaApplication.class)
public class JpaTest {

    @Autowired
    private UserRepository userRepository;

    @Test
    public void test(){
        List<User> all = userRepository.findAll();
        System.out.println(all);

    }
}

3.7 控制台打印信息

注意：如果是jdk9，执行报错如下：

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：

1
2
3
4
5
6
<!--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>

这里JDK11测试不需要再导入。

4. SpringBoot整合Redis

4.1 添加redis的起步依赖

1
2
3
4
5
<!-- 配置使用redis启动器 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>

4.2 配置redis的连接信息

1
2
3
#Redis
spring.redis.host=127.0.0.1
spring.redis.port=6379

4.3 注入RedisTemplate测试redis操作

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
@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);

    }

}

注：转载文章请注明出处，谢谢~