Spring学习-07 Spring+SpringMVC+Druid+jdbcTemplate(注解方式)

Spring学习-07 Spring+SpringMVC+Druid+jdbcTemplate(注解方式)

注意: 是在05(Spring+SpringMVC)完成后的的基础上操作,

07.01 导入依赖(pom.xml)

• mysql数据库依赖
• jdbctTemplate依赖
• druid依赖

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-jdbc</artifactId>
</dependency>
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
</dependency>

07.02 增加数据库配置文件(jdbc.properties)

# JDBC
# MySQL 8.x: com.mysql.cj.jdbc.Driver
jdbc.driverClass=com.mysql.jdbc.Driver
jdbc.connectionURL=jdbc:mysql://127.0.0.1:3306/2019springtest?useUnicode=true&characterEncoding=utf-8&useSSL=false
jdbc.username=root
jdbc.password=root

# JDBC Pool
jdbc.pool.init=1
jdbc.pool.minIdle=3
jdbc.pool.maxActive=20

# JDBC Test
jdbc.testSql=SELECT 'x' FROM DUAL

07.03 druid配置文件(DruidDatasourceConfig.java)

• 配置datasource
  • 数据源配置com.alibaba.druid.pool.DruidDataSource
  • 配置监控统计拦截的filters,不写的话无法监控sql执行
• 配置jdbcTemplate

@Configuration  //表示配置文件类
@PropertySource(value = {"classpath:jdbc.properties",},ignoreResourceNotFound=true)  //添加配置文件
public class DruidDatasourceConfig {
    // 参考链接 https://github.com/alibaba/druid/wiki/DruidDataSource%E9%85%8D%E7%BD%AE
    @Value("${jdbc.driverClass}")
    private String jdbc_driverClassName ;
    @Value("${jdbc.connectionURL}")
    private String jdbc_url ;
    @Value("${jdbc.username}")
    private String jdbc_username ;
    @Value("${jdbc.password}")
    private String jdbc_password ;
    @Value("${jdbc.pool.init}")
    private Integer jdbc_initialSize ;
    @Value("${jdbc.pool.minIdle}")
    private Integer jdbc_minIdle ;
    @Value("${jdbc.pool.maxWait}")
    private Integer jdbc_maxWait ;
    @Value("${jdbc.pool.maxActive}")
    private Integer jdbc_maxActive ;

    @Autowired
    private DataSource dataSource;

    @Bean(destroyMethod="close",initMethod="init")
    public DataSource dataSource() throws SQLException {
        DruidDataSource dataSource = new DruidDataSource();
        dataSource.setUrl(jdbc_url);
        dataSource.setDriverClassName(jdbc_driverClassName);
        dataSource.setPassword(jdbc_password);
        dataSource.setUsername(jdbc_username);
        dataSource.setInitialSize(jdbc_initialSize);
        dataSource.setMinIdle(jdbc_minIdle);
        dataSource.setMaxWait(jdbc_maxWait);
        dataSource.setMaxActive(jdbc_maxActive);
        dataSource.setValidationQuery("select 1 from dual");
        dataSource.setFilters("stat");  //配置以后监控中心才会分析执行的sql
        return dataSource;
    }

    @Bean
    public JdbcTemplate jdbcTemplate(){
        return new JdbcTemplate(dataSource);
    }

}

07.04 druid配置文件(DruidStatFilter.java)

• 配置Filter ,忽略资源等

  
@WebFilter(
        filterName="druidWebStatFilter",urlPatterns="/*",
        initParams={
                /** 忽略资源 */
                @WebInitParam(name="exclusions", value="*.js,*.gif,*.jpg,*.bmp,*.png,*.css,*.ico,/druid/*,/static/*"),
                @WebInitParam(name="profileEnable",value="true"),
                /** 监控当前COOKIE的用户 */
                @WebInitParam(name="principalCookieName",value="USER_COOKIE"),
                /** 监控当前SESSION的用户 */
                @WebInitParam(name="principalSessionName",value="USER_SESSION"),
                /** 监控单个url访问数据库情况 */
                @WebInitParam(name = "profileEnable",value = "true")
        }
)
public class DruidStatFilter extends WebStatFilter {
}

07.05 druid配置文件(DruidStatViewServlet.java)

• 监控配置

  
@WebServlet(urlPatterns="/druid/*",
        initParams={
                /** 白名单，如果不配置或value为空，则允许所有 */
                @WebInitParam(name="allow",value=""),
                /** 黑名单，与白名单存在相同IP时，优先于白名单 */
                @WebInitParam(name="deny",value=""),
                /** 用户名 */
                @WebInitParam(name="loginUsername",value="admin"),
                /** 密码 */
                @WebInitParam(name="loginPassword",value="admin"),
                /** 禁用HTML页面上的“Reset All”功能   */
                @WebInitParam(name="resetEnable",value="false")
        })
public class DruidStatViewServlet extends StatViewServlet {
}

07.06 测试用Entity(User.java)

• 使用的lombok支持

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private Integer id;
    private String username;
    private String password;
    private String avatar;
    private Date created;
    private Date updated;
}

07.07 测试用DAO(UserDao.java)

• 创建方法finaAll取得所有的User数据
• 需要实现一个UserRowMapper,用来做映射数据

@Repository
public class UserDao {
    @Autowired
    JdbcTemplate jdbcTemplate;
    
    public List<User> findAll() {
        return jdbcTemplate.query("select * from user", new UserRowMapper());

    }
    class UserRowMapper implements RowMapper<User> {
        @Override
        public User mapRow(ResultSet rs, int i) throws SQLException {
            User user = new User();
            user.setId(rs.getInt("id"));
            user.setUsername(rs.getString("username"));
            user.setPassword(rs.getString("password"));
            user.setAvatar(rs.getString("avatar"));
            user.setCreated(rs.getDate("created"));
            user.setUpdated(rs.getDate("updated"));
            return user;
        }
    }
}

07.08 测试用Controller(UserController.java)

• 注入UserDao
• 创建接口/user/list,返回前台JSON数据

@Controller
public class UserController {

    @Autowired
    private UserDao userDao;

    @RequestMapping("/user/list")
    @ResponseBody
    public List<User> findall() {
        return userDao.findAll();
    }
}