Spring Boot 入门集成小实例 无web

第一步 新建MySQL数据库

第二步 新建springBoot项目

第三步 配置pom.xml

<dependencies>
        <!-- JpaRepository -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!-- QuerydslPredicateExecutor -->
        <dependency>
            <groupId>com.querydsl</groupId>
            <artifactId>querydsl-apt</artifactId>
            <version>${querydsl.version}</version>
            <scope>provided</scope>
        </dependency>

        <dependency>
            <groupId>com.querydsl</groupId>
            <artifactId>querydsl-jpa</artifactId>
            <version>${querydsl.version}</version>
        </dependency>

        <!-- getter setter -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <!-- 用以映射实体类 自动生成表 -->
        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-validator</artifactId>
            <version>5.3.5.Final</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
            <!-- 用以生成Quser的插件  -->
            <plugin>
                <groupId>com.mysema.maven</groupId>
                <artifactId>apt-maven-plugin</artifactId>
                <version>1.1.3</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>process</goal>
                        </goals>
                        <configuration>
                            <outputDirectory>target/generated-sources/java</outputDirectory>
                            <processor>com.querydsl.apt.jpa.JPAAnnotationProcessor</processor>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>

第四步 新建包类接口 文件目录如下

第五步 配置application.properties

第六步 开始写代码了

SuperEntity

@MappedSuperclass
@Getter
@Setter
public class SuperEntity implements Serializable{
    @Id
    @GeneratedValue(generator = "uuid")
    @GenericGenerator(name = "uuid",strategy = "uuid")
    @Column(length = 64)
    private String id;
    @Column(nullable = true)
    private Date createTime;
    @Version
    private Date version;
}

User

@Entity
@Setter
@Getter
public class User extends SuperEntity{
    private String name;
    private int age;
}

BaseRepository

@NoRepositoryBean
public interface BaseRepository<T> extends JpaRepository<T,String>,QuerydslPredicateExecutor<T> {
}

UserRepository

public interface UserRepository extends BaseRepository<User> {
    List<User> findByAgeIn(String[] ageArr);
}

BaseService

public class BaseService<T> {
    @Autowired
    protected BaseRepository<T> baseRepository;

    public Iterable<T> findAll(Predicate predicate){
        return baseRepository.findAll(predicate);
    }

    public Page<T> findAll(Predicate predicate, Pageable pageable){
        return baseRepository.findAll(predicate, pageable);
    }

    public List<T> findAll(){
        return baseRepository.findAll();
    }

    public <S extends T> S save(S entity){
        return baseRepository.save(entity);
    }

    public boolean exists(Predicate predicate){
        return baseRepository.exists(predicate);
    }
}

UserService

@Service
@Transactional
public class UserService extends BaseService<User>{

}

ViewDataPage

@Getter
@Setter
@NoArgsConstructor
@AllArgsConstructor
public class ViewDataPage {
    private Object rows;
    private long records;
    private int page;
    private int total;

    public static ViewDataPage of(Page page){
        return new ViewDataPage(page.getContent(),page.getTotalElements(),page.getNumber()+1,page.getTotalPages());
    }
}

UserController

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

    @Autowired
    private UserService userService;

    @RequestMapping("/list")
    public Object findAllList(@QuerydslPredicate(root = User.class)Predicate predicate, String s, Pageable
            pageable){
        return ViewDataPage.of(userService.findAll(predicate, pageable));
    }
}

注意事项

若是lombok报错 则要安装该插件

最后一定要记得运行前在该项目命令行下 执行mvn clean compile 在target下生成Quser文件 项目才能成功运行

项目最后结果

记得自己在数据库中添加数据 在刷新网页下就好了
Navicat Premium 12 这个是真的好用 推荐一下

以上，是不是很简单，Spring Boot真是太强大了，谁用谁喜欢。