搭建springboot web系统

一、集成spring-data-jpa

我在实际项目中使用mybaties居多，但是个人喜欢spring-data-jpa，在

1. 添加依赖

<!-- 数据源依赖 -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid-spring-boot-starter</artifactId>
    <version>1.1.10</version>
</dependency>
<!-- 添加 springboot jpa依赖 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
    <version>2.1.10.RELEASE</version>
</dependency>
<!-- 添加mysql驱动 -->
<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>5.1.28</version>
</dependency>

2. 添加配置

配置文件使用yaml格式，个人喜好

spring:
  datasource:
    username: root
    password: 12345
    url: jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&useSSL=false
    driver-class-name: com.mysql.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource
    # 下面为连接池的补充设置，应用到上面所有数据源中
    # 初始化大小，最小，最大
    initial-size: 5
    min-idle: 5
    max-active: 20
    # 配置获取连接等待超时的时间
    max-wait: 60000
    # 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒
    time-between-eviction-runs-millis: 60000
    # 配置一个连接在池中最小生存的时间，单位是毫秒
    min-evictable-idle-time-millis: 300000
    validation-query: SELECT 1 FROM DUAL
    test-while-idle: true
    test-on-borrow: false
    test-on-return: false
    # 打开PSCache，并且指定每个连接上PSCache的大小
    pool-prepared-statements: true
    #   配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙
    max-pool-prepared-statement-per-connection-size: 20
    filters: stat,wall
    use-global-data-source-stat: true
    # 通过connectProperties属性来打开mergeSql功能；慢SQL记录
    connect-properties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000
  jpa:
      properties:
        hibernate:
          dialect: org.hibernate.dialect.MySQL5InnoDBDialect
          format_sql: true
      show-sql: false

3.上代码

3.1 model

@Entity
@Table(name = "t_user")
public class User implements Serializable {
    private String id;
    private String state;
    private String nickName;

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    @Column(name = "id")
    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }

    @Column(name = "state")
    public String getState() {
        return state;
    }
    public void setState(String state) {
        this.state = state;
    }

    @Column(name = "nickname")
    public String getNickName() {
        return nickName;
    }
    public void setNickName(String nickName) {
        this.nickName = nickName;
    }
}

3.2 repostory

@Repository
public interface UserRepository extends PagingAndSortingRepository<User, String>, JpaSpecificationExecutor {

    List<User> findByState(String state);

}

3.3 controller

@RequestMapping("/user")
@RestController
public class UserController {

    @Autowired
    private UserService userService;

    @GetMapping("/findByState")
    public List<User> findByState(String state){
        return userService.findByState(state);
    }
}

3.4 service

@Service
public class UserService {

    @Autowired
    private UserRepository userRepository;

    public List<User> findByState(String state){
        return userRepository.findByState(state);
    }

}

4.起服务做验证