SpringBoot与整合其他技术
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SpringBoot
文章目录
5.1 SpringBoot整合Mybatis
5.1.1 添加Mybatis的起步依赖
<dependency>
<groupId>org.mybatis.spring.bootgroupId>
<artifactId>mybatis-spring-boot-starterartifactId>
<version>1.1.1version>
dependency>
5.1.2 添加数据库驱动坐标
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
dependency>
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
#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
5.1.4 创建user表
在test数据库中创建user表
-- ----------------------------
-- 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');
5.1.5 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 .. ..
}
5.1.6 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
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"
version="1.0" encoding="utf-8" ?>
<mapper namespace="com.itheima.mapper.UserMapper">
<select id="queryUserList" resultType="user">
select * from user
select>
mapper>
5.1.8 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.itheima.domain
#加载Mybatis映射文件
mybatis.mapper-locations=classpath:mapper/*Mapper.xml
5.1.9 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;
}
}
5.1.10 测试
5.2 SpringBoot整合Junit
5.2.1 添加Junit的起步依赖
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-testartifactId>
<scope>testscope>
dependency>
5.2.2 编写测试类
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);
}
}
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
@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
5.3 SpringBoot整合Spring Data JPA
5.3.1 添加Spring Data JPA的起步依赖
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-data-jpaartifactId>
dependency>
5.3.2 添加数据库驱动依赖
<dependency>
<groupId>mysqlgroupId>
<artifactId>mysql-connector-javaartifactId>
dependency>
5.3.3 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
5.3.4 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... ...
}
5.3.5 编写UserRepository
public interface UserRepository extends JpaRepository<User,Long>{
public List<User> findAll();
}
5.3.6 编写测试类
@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);
}
}
5.3.7 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：
<dependency>
<groupId>javax.xml.bindgroupId>
<artifactId>jaxb-apiartifactId>
<version>2.3.0version>
dependency>
5.4 SpringBoot整合Redis
5.4.1 添加redis的起步依赖
<dependency>
<groupId>org.springframework.bootgroupId>
<artifactId>spring-boot-starter-data-redisartifactId>
dependency>
5.4.2 配置redis的连接信息
#Redis
spring.redis.host=127.0.0.1
spring.redis.port=6379
5.4.3 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);
}
}
