Spring框架基于注解怎么开发CRUD

1. Maven坐标

<!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc --><dependency>    <groupId>org.springframework</groupId>    <artifactId>spring-webmvc</artifactId>    <version>5.2.0.RELEASE</version></dependency><!-- SpringJDBC jar包 --><dependency>    <groupId>org.springframework</groupId>    <artifactId>spring-jdbc</artifactId>    <version>5.2.0.RELEASE</version></dependency><!-- spring整合junit jar包 --><dependency>    <groupId>org.springframework</groupId>    <artifactId>spring-test</artifactId>    <version>5.2.0.RELEASE</version>    <scope>test</scope></dependency><!--  Lombok jar包 --><dependency>    <scope>compile</scope>    <groupId>org.projectlombok</groupId>    <artifactId>lombok</artifactId>    <version>1.18.16</version></dependency><!--单元测试jar包--><dependency>    <groupId>junit</groupId>    <artifactId>junit</artifactId>    <version>4.12</version></dependency><!-- mysql数据库jar包 --><dependency>    <groupId>mysql</groupId>    <artifactId>mysql-connector-java</artifactId>    <version>5.1.6</version>    <scope>runtime</scope></dependency>

2. 实体类

@Data@Component//等价于 <bean id="user" class="org.westos.pojo.User"/>public class User {    private Integer id;    private String username;    private Date birthday;    private String sex;    private String address;}

3. Spring配置类

用于代替原来的SpringIOC

@Configuration@ComponentScan(value = "org.westos")@PropertySource("classpath:jdbcConfig.properties")public class MyConfig {    @Value("${jdbc.driver}")    private String driver;    @Value("${jdbc.url}")    private String url;    @Value("${jdbc.username}")    private String username;    @Value("${jdbc.password}")    private String password;    //注入数据源    @Bean("dataSource")    public DataSource createDataSource() {        DruidDataSource ds = new DruidDataSource();        ds.setDriverClassName(driver);        ds.setUrl(url);        ds.setUsername(username);        ds.setPassword(password);        return ds;    }    @Bean("jdbcTemplate")    //注入JDBCtemplate模板    public JdbcTemplate createJdbcTemplate(DataSource dataSource){        return new JdbcTemplate(dataSource);    }}

4. 业务层代码

接口

public interface UserService {    //查询所有用户    List<User> findAll();    //根据id查询用户    User findUserById(Integer uid);    //保存用户    void save(User user);    //更新用户    void update(User user);    //删除用户    void delete(Integer uid);}

实现类

@Service("userService")public class UserServiceImpl implements UserService {    @Autowired    private UserDao userDao;    //查询所有用户    public List<User> findAll() {        List<User> list = userDao.findAll();        return list;    }    //根据id查询用户    public User findUserById(Integer uid) {        User user = userDao.findUserById(uid);        return user;    }    //保存用户    public void save(User user) {        userDao.save(user);    }    //更新用户    public void update(User user) {        userDao.update(user);    }    //删除用户    public void delete(Integer uid) {        userDao.delete(uid);    }}

5. 持久层代码

接口

public interface UserDao {    //查询所有    List<User> findAll();    //根据id查询    User findUserById(Integer uid);    //保存    void save(User user);    //更新    void update(User user);    //删除    void delete(Integer uid);}

实现类

@Repository("userDao")public class UserDaoImpl implements UserDao {    @Autowired    private JdbcTemplate jdbcTemplate;    //查询所有    public List<User> findAll() {        return jdbcTemplate.query("select * from user", new BeanPropertyRowMapper<User>(User.class));    }    //根据id查询    public User findUserById(Integer uid) {        return jdbcTemplate.queryForObject("select * from user where id=?", new BeanPropertyRowMapper<User>(User.class), uid);    }    //保存    public void save(User user) {        jdbcTemplate.update("insert into user(username,birthday,sex,address) values (?,?,?,?)", user.getUsername(), user.getBirthday(), user.getSex(), user.getAddress());    }    //更新    public void update(User user) {        jdbcTemplate.update("update user set username=?,birthday=?,sex=?,address=? where id = ?", user.getUsername(), user.getBirthday(), user.getSex(), user.getAddress(), user.getId());    }    //删除    public void delete(Integer uid) {        jdbcTemplate.update("delete from user where id=?", uid);    }}

6. jdbc配置文件

jdbc.driver=com.mysql.jdbc.Driverjdbc.url=jdbc:mysql://localhost:3306/mybatis_testjdbc.username=rootjdbc.password=123

7. 测试类代码

@RunWith(SpringJUnit4ClassRunner.class)@ContextConfiguration(classes = MyConfig.class)public class MyTest {    @Autowired    private UserService userService;    @Autowired    private User user;    @Test    public void findAllTest(){        List<User> list = userService.findAll();        for (User user : list) {            System.out.println(user);        }    }    @Test    public void findUserByIdTest(){        User user = userService.findUserById(74);        System.out.println(user);    }    @Test    public void saveUserTest(){        user.setUsername("张三");        user.setBirthday(new Date());        user.setSex("女");        user.setAddress("西安市长安区");        userService.save(user);    }    @Test    public void updateUserTest(){        user.setId(75);        user.setUsername("李四");        user.setBirthday(new Date());        user.setSex("女");        user.setAddress("西安市雁塔");        userService.update(user);    }    @Test    public void deleteUserTest(){        user.setId(75);        userService.delete(user.getId());    }}

8. 工程目录

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