Spring 整合

1.Spring 整合 Junit

1.1新建项目结构

1.2导入依赖

• 导入 junit 与 Spring 依赖

  <!--        添加 spring 依赖-->
  <dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>5.2.17.RELEASE</version>
  </dependency>
  <!--        添加 junit 依赖-->
  <dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version><scope>test</scope>
  </dependency><!--        添加 spring test 整合依赖-->
  <dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId><version>5.2.7.RELEASE</version>
  </dependency>
  

1.3正常的写 spring 代码

• 添加 mapper

  @Repository
  public class StudentMapperImpl implements StudentMapper {public void save() {System.out.println("保存操作");}
  }
  

• 添加配置类

  @Configuration
  @ComponentScan("cn.sycoder")
  public class SpringConfig {
  }
  

1.4通过测试类拿去mapper

• 先建立测试类

  @RunWith(SpringJUnit4ClassRunner.class)
  @ContextConfiguration(classes = {SpringConfig.class})
  public class StudentTest {@Autowiredprivate StudentMapper studentMapper;@Testpublic void testStudentMapper(){studentMapper.save();}}
  

1.5@Runwith

说明	@Runwith
位置	测试类上方
作用	测试类注解，设置 junit 运行器的
属性	使用测试运行的环境，SpringJUnit4ClassRunner.class

1.5@ContextConfiguration

说明	@ContextConfiguration
位置	测试类上方
作用	设置 junit 加载 spring 配置类
属性	classes：核心配置类，可以传入多个 locations：配置文件的文件路径名称

2.Spring整合JdbcTemplate

• 概述：jdbcTemplate 是 spring 对于学过的 jdbc 的封装，实现了方便操作数据库

2.1导入依赖

• 导入依赖

  <!--        添加 orm 依赖--><dependency><groupId>org.springframework</groupId><artifactId>spring-orm</artifactId><version>5.2.17.RELEASE</version></dependency><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>8.0.29</version></dependency><dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId><version>1.2.8</version></dependency><dependency><groupId>org.projectlombok</groupId><artifactId>lombok</artifactId><version>1.18.22</version></dependency>
  

2.2建立 jdbc.propreties

• 创建配置文件

  jdbc.username=root
  jdbc.password=123456
  jdbc.driverClassName=com.mysql.cj.jdbc.Driver
  jdbc.url=jdbc:mysql://localhost:3306/mybatis
  

2.3配置druid 连接池

• 配置类

  @Configuration
  @PropertySource("jdbc.properties")
  public class DruidConfig {@Value("${jdbc.username}")private String username;@Value("${jdbc.password}")private String password;@Value("${jdbc.url}")private String url;@Value("${jdbc.driverClassName}")private String driver;@Beanpublic DataSource dataSource(){final DruidDataSource source = new DruidDataSource();source.setUsername(username);source.setPassword(password);source.setDriverClassName(driver);source.setUrl(url);return source;}}
  

• 配置 jdbcTemplate 类

  @Configuration
  @PropertySource("jdbc.properties")
  public class DruidConfig {@Value("${jdbc.username}")private String username;@Value("${jdbc.password}")private String password;@Value("${jdbc.url}")private String url;@Value("${jdbc.driverClassName}")private String driver;@Beanpublic DataSource dataSource(){final DruidDataSource source = new DruidDataSource();source.setUsername(username);source.setPassword(password);source.setDriverClassName(driver);source.setUrl(url);return source;}@Beanpublic JdbcTemplate jdbcTemplate(DataSource dataSource){JdbcTemplate jdbcTemplate = new JdbcTemplate(dataSource);return jdbcTemplate;}}
  

2.4修改 mapper 实现类做保存和查询操作

• 修改保存

  @Repository
  public class StudentMapperImpl implements StudentMapper {@Autowiredprivate JdbcTemplate template;public void save() {String sql = "insert into student value(null,?,?)";template.update(sql,"sy",18);}public Student getById(Long id) {Object student = template.queryForObject("select * from student where id = ?",new BeanPropertyRowMapper(Student.class), id);return (Student) student;
  //        return null;}
  }