SpringCloud+JPA实现增删查改（附源码）

引言：

        本文主要分享了SpringCloud微服务的环境下使用JPA实现增删查改，用到了Eureka、feign、zuul还有JPA的相关知识；主要实现了JPA创建数据库，实现增删查改，模拟服务网关进行拦截；

1. 目录结构总览

1.1 eurekaserver

1.2 producer_jpa

1.3 consumer_feign

1.4 Zuul

2. 创建Eurekaserver

创建SpringBoot项目(springcloud_eurekaserver)，只导入EurekaServer；

• 在启动文件中加入@EnableEurekaServer注解用于开启Eureka服务注册功能

2.1 配置application.yml

server:
  port: 8761
eureka:
  instance:
    hostname: 127.0.0.1
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/
    register-with-eureka: false
    fetch-registry: false

3. 创建producer_jpa

创建SpringBoot项目(springcloud_producer_jpa)，选择以下依赖；

• 在启动文件中加入@EnableEurekaClient用于启动Eureka客户端注册功能

3.1 配置application.yml

server:
  port: 9091
spring:
  application:
    name: producer-service-jpa
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/db0711?serverTimezone=UTC
    username: root
    password: root
  jpa:
    hibernate:
      #ddl-auto: create
      ddl-auto: update
    show-sql: true
eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/

3.2 Student实体类

创建Student.java，完成创建表、设置自增、设置数据库字段等等；

• 在导Id的包时应导入：import javax.persistence.*;
• 注意使用@Entity声明为实体类

/**
 * Created by Kak on 2020/9/25.
 */
@Data
@NoArgsConstructor
@AllArgsConstructor
@Entity //声明为实体类
@Table(name = "TB_STUDENT")
public class Student implements Serializable{
    @Id
    //创建自增
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    //数据库字段
    @Column(name = "ss_id")
    private Integer ssId;
    @Column(name = "ss_name")
    private String ssname;
    //默认数据库字段与该字段一致
    private String sex;
    private String age;
}

3.3 创建StudentRepository

/**
 * dao接口
 * Repository   顶级接口  空
 * CrudRepository  派生  默认实现了CRUD
 * PagingAndSortingRepository 继续派生 增加了分页和排序功能
 * JpaRepository  继续派生 增加了批量处理功能
 * Created by Kak on 2020/9/25.
 */

@Repository
public interface StudentRepository extends JpaRepository<Student,Integer>{

}

3.4 server层的实现

3.4.1 StudentService接口

/**
 * Created by Kak on 2020/9/25.
 */
public interface StudentService {
    /**
     * 查询全部学生信息
     * @return  学生信息
     */
    public List<Student> findAllStudent();

    /**
     * 通过id查询学生信息
     * @param sid 传入的id
     * @return 学生对象
     */
    public Student findStuById(Integer sid);

    /**
     * 添加记录到数据表
     * @param student   无主键
     * @return student  有主键
     */
    public Student addStudent(Student student);

    /**
     *
     * @param student   修改的对象信息（必须有主键）
     * @return  student对象   返回指定修改主键的对象所有信息
     */
    public Student updateStudent(Student student);

    /**
     * 删除学生信息
     * @param sid 传入的id
     * @return 是否删除成功
     */
    public boolean deleteStudentById(Integer sid);
}

3.4.2 StudentServiceImpl实现类

@Resource 注解注入：默认先按照类型搜索

• 如设置了type属性，只按照type搜索，搜不到抛异常
• 设置name属性，只按照name搜索，搜不到，抛异常

@Autowried 默认按照类型搜索，搜不到抛null

• 按照名称搜索与@Qualifer配合

/**
 * Created by Kak on 2020/9/25.
 */
@Service
@Slf4j
public class StudentServiceImpl implements StudentService{
    @Resource
    private StudentRepository studentRepository;
    @Override
    public List<Student> findAllStudent() {
        List<Student> all = studentRepository.findAll();

        return all;
    }

    @Override
    public Student findStuById(Integer sid) {
        Optional<Student> byId = studentRepository.findById(sid);
        return byId.get();
    }

    @Override
    public Student addStudent(Student student) {
        Student save = studentRepository.save(student);
        return save;
    }

    @Override
    public Student updateStudent(Student student) {
        Student student1 = studentRepository.saveAndFlush(student);
        return student1;
    }

    @Override
    public boolean deleteStudentById(Integer sid) {
        try{
            studentRepository.deleteById(sid);
            return true;
        }catch (Exception ex){
           log.info(ex.getMessage());
        }
        return false;
    }
}

3.5 StudentController的实现

用于提供服务信息

/**
 * Created by Kak on 2020/9/25.
 */
@RestController
public class StudentController {
    @Autowired(required = false)
    private StudentService studentService;

    @RequestMapping(value = "/students",method = RequestMethod.GET)
    public List<Student> findAll(){
        List<Student> allStudent = studentService.findAllStudent();
        return allStudent;
    }

    @RequestMapping(value = "/student/{id}",method = RequestMethod.GET)
    public Student findOneStudent(@PathVariable(value = "id") int sid){
        Student stuById = studentService.findStuById(sid);
        return stuById;
    }

    @RequestMapping(value = "/student",method = RequestMethod.POST)
    public Student addStudent(@RequestBody Student student){
        Student student1 = studentService.addStudent(student);
        return student1;
    }

    @RequestMapping(value = "/student",method = RequestMethod.PUT)
    public Student updateStudent(@RequestBody Student student){
        Student student1 = studentService.updateStudent(student);
        return student1;
    }

    @RequestMapping(value = "/student/{id}",method = RequestMethod.DELETE)
    public Boolean deleteStudent(@PathVariable(value = "id") int sid){
        boolean b = studentService.deleteStudentById(sid);
        return b;
    }
}

4. 创建consumer_feign

创建SpringBoot项目(springcloud_consumer_feign)，选择以下依赖；（数据源可以不加）

4.1 修改SpringcloudConsumerFeignApplication启动文件

在启动文件中加入：

• @EnableEurekaClient用于启动Eureka客户端注册功能；
• @EnableFeignClients用于开启feign客户端

4.2 配置application.yml

server:
  port: 9093
eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/
spring:
  application:
    name: feign-client

4.3 Student实体类的实现

/**
 * Created by Kak on 2020/9/25.
 */
@Data
@NoArgsConstructor
@AllArgsConstructor
public class Student implements Serializable{
    private Integer ssId;
    private String ssname;
    private String sex;
    private String age;
}

4.4 ActionResult的实现

/**
 * Created by Kak on 2020/9/25.
 */
@Data
@AllArgsConstructor
@NoArgsConstructor
public class ActionResult {
    private Integer statueCode;
    private String msg;
    private Object data;
}

4.5 编写RemoteFeignServer接口

/**
 * Created by Kak on 2020/9/25.
 */
@FeignClient(value = "producer-service-jpa")
public interface RemoteFeignService {
    @RequestMapping(value = "/students",method = RequestMethod.GET)
    public List<Object> findStudent();

    @RequestMapping(value = "/student/{id}",method = RequestMethod.GET)
    public Student findOneStudent(@PathVariable(value = "id") int sid);

    @RequestMapping(value = "/student",method = RequestMethod.POST)
    public Student addStudent(@RequestBody Student student);

    @RequestMapping(value = "/student",method = RequestMethod.PUT)
    public Student updateStudent(@RequestBody Student student);

    @RequestMapping(value = "/student/{id}",method = RequestMethod.DELETE)
    public Boolean deleteStudent(@PathVariable(value = "id") int sid);

}

4.6 StuController的实现

全部使用了get请求，可以分别使用，用postman测试；

/**
 * Created by Kak on 2020/9/25.
 */
@RestController
public class StudentController {
    @Autowired(required = false)
    private RemoteFeignService remoteFeignService;
    @RequestMapping("/students")
    public ActionResult findAllStu() {
        List<Object> student = remoteFeignService.findStudent();
        ActionResult actionResult = new ActionResult(200, "find all success", student);
        return actionResult;
    }

    @RequestMapping("/student/{id}")
    public ActionResult findOneStu(@PathVariable(value = "id") int sid){
        Student oneStudent = remoteFeignService.findOneStudent(sid);
        ActionResult actionResult = new ActionResult(200, "find one success", oneStudent);
        return actionResult;
    }

    @RequestMapping("/addstudent")
    public ActionResult addStu(Student student){
        Student student1 = remoteFeignService.addStudent(student);
        ActionResult actionResult = new ActionResult(200, "add student success", student1);
        return actionResult;
    }

    @RequestMapping("/updateStudent")
    public ActionResult updateStu(Student student){
        Student student1 = remoteFeignService.updateStudent(student);
        ActionResult actionResult = new ActionResult(200, "update student success", student1);
        return actionResult;
    }

    @RequestMapping("/deleteStudent/{id}")
    public ActionResult deleteStu(@PathVariable(value = "id")Integer sid){
        Boolean aBoolean = remoteFeignService.deleteStudent(sid);
        ActionResult actionResult = new ActionResult(200, "delete student success", aBoolean);
        return actionResult;
    }
}

5. 创建zuul

创建SpringBoot项目(springcloud_zuul)，选择以下依赖；

5.1 修改启动文件

在启动文件中加入以下注解：

1. @EnableDiscoveryClient：用于启动Eureka客户端注册功能
2. @EnableZuulProxy：用于开启zuul路由代理服务

5.2 配置application.yml

server:
  port: 9098
spring:
  application:
    name: consumer-server-zuul
eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka
#自定义路由
zuul:
  routes:
    stu:
      path: /stu/**
      serviceId: feign-client

5.3 配置AuthenFilter

设置过滤文件，模拟token当token=200时可以访问，否则拦截；

/**
 * Created by Kak on 2020/9/25.
 */
@Component
public class AuthenFilter extends ZuulFilter {
    //定义过滤器的类型
    @Override
    public String filterType() {
        return FilterConstants.PRE_TYPE;
    }

    //定义过滤器的执行顺序。数字越小，优先执行默认5
    @Override
    public int filterOrder() {
        return FilterConstants.PRE_DECORATION_FILTER_ORDER - 2;
    }

    //设定过滤器是否生效 true生效
    @Override
    public boolean shouldFilter() {
        return true;
    }

    //过滤器的逻辑
    @Override
    public Object run() throws ZuulException {
        RequestContext currentContext = RequestContext.getCurrentContext();
        HttpServletRequest request = currentContext.getRequest();
        //从参数中获取token
        String token = request.getParameter("token");
        //从请求头部获取认证令牌信息
        request.getHeader("Authentication");
        //令牌无效或不合法
        if (token == null || !"200".equalsIgnoreCase(token)) {
            currentContext.setSendZuulResponse(false);//阻止请求继续发送到微服务
            currentContext.setResponseStatusCode(HttpStatus.UNAUTHORIZED.value());
            currentContext.setResponseBody("no permission......");
        }
        return null;
    }
}

6. 结果展示