Feign+mybatisplus搭建项目遇到的坑如何解决

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出现的错误

Failed to bind properties under ‘spring.datasource’ to javax.sql.DataSource:

@org.springframework.beans.factory.annotation.Autowired(required=true)等

原因（简洁说明）

使用代码生成器的service层需要继承extends IService，这是一个坑，它不可以在接口工程中使用，实体类可以

如果想要使用mp的功能，就需要：

—— > 1.接口工程中创建无extends IService的接口 A

—— > 2.provider工程中放入代码生成的service层 接口B

—— > 3.provider工程的实现类需要 implements A,B

代码

接口工程

import com.study.seckill.entity.User;import org.springframework.cloud.openfeign.FeignClient;import org.springframework.stereotype.Service;import org.springframework.WEB.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import java.util.List;@Service@FeignClient(value = "seckill-provider-localhost")public interface IUserService  {    @RequestMapping(value = "/users",method = RequestMethod.GET)    public List<User> quallAll();}

接口工程依赖

<dependencies>    <dependency>      <groupId>org.springframework.cloud</groupId>      <artifactId>spring-cloud-starter-openfeign</artifactId>    </dependency>    <dependency>      <groupId>com.baomidou</groupId>      <artifactId>mybatis-plus-generate</artifactId>      <version>2.2.0</version>    </dependency>    <dependency>      <groupId>com.baomidou</groupId>      <artifactId>mybatis-plus-extension</artifactId>      <version>3.1.1</version>    </dependency>    <dependency>      <groupId>org.projectlombok</groupId>      <artifactId>lombok</artifactId>      <optional>true</optional>    </dependency>  </dependencies>

–注意不要有druid数据源依赖，可能会报sqlSession等异常–

consumer工程代码

controller

@RestControllerpublic class UserConsumerController {    @Autowired    private IUserService iUserService;    @GetMapping(value = "/users")    public  String queryByName(){        List<User> users = iUserService.quallAll();        return users.toString();    }    }

启动类

@EnableFeignClients(basePackages = {"com.study.seckill"})@SpringBootApplication@EnableEurekaClientpublic class Seckill_Consumer_8080 {    public static void main(String[] args) {        SpringApplication.run(Seckill_Consumer_8080.class, args);    }}

consumer依赖

 <dependencies>    <dependency>      <groupId>com.study</groupId>      <artifactId>seckill-api</artifactId>      <version>0.0.1-SNAPSHOT</version>    </dependency>    <dependency>      <groupId>org.springframework.boot</groupId>      <artifactId>spring-boot-starter-web</artifactId>    </dependency>        <dependency>      <groupId>org.springframework.cloud</groupId>      <artifactId>spring-cloud-starter-ribbon</artifactId>      <version>1.4.6.RELEASE</version>    </dependency>    <dependency>      <groupId>org.springframework.cloud</groupId>      <artifactId>spring-cloud-starter-eureka</artifactId>      <version>1.4.6.RELEASE</version>    </dependency>    <dependency>      <groupId>org.springframework.cloud</groupId>      <artifactId>spring-cloud-starter-openfeign</artifactId>    </dependency>    <dependency>      <groupId>org.springframework.cloud</groupId>      <artifactId>spring-cloud-starter-hystrix</artifactId>    </dependency>    <dependency>      <groupId>org.springframework.cloud</groupId>      <artifactId>spring-cloud-starter-hystrix-dashboard</artifactId>    </dependency>  </dependencies>

consumer的application.yml

server:  port: 8080#配置eurekaeureka:  client:    reGISter-with-eureka: true    service-url:      defaultZone: Http://localhost:7001/eureka/  instance:    instance-id: seckill-consumer-8080    prefer-ip-address: truespring:  application:    name: seckill-consumer-8080#开启降级feign:#  hystrix:#    enabled: true#feign客户端负载均衡策略#seckill-provider-localhost:#  ribbon:###   NFLoadBalancerRuleClassName: com.netflix.loadbalancer.RandomRule #配置规则 随机#    NFLoadBalancerRuleClassName: com.netflix.loadbalancer.RoundRobinRule #配置规则 轮询##   NFLoadBalancerRuleClassName: com.netflix.loadbalancer.RetryRule #配置规则 重试##   NFLoadBalancerRuleClassName: com.netflix.loadbalancer.WeightedResponseTimeRule #配置规则 响应时间权重##   NFLoadBalancerRuleClassName: com.netflix.loadbalancer.BestAvailableRule #配置规则 最空闲连接策略#    ConnectTimeout: 5000 #请求连接超时时间#    ReadTimeout: 10000 #请求处理的超时时间#    OkToRetryOnAllOperations: true #对所有请求都进行重试#    MaxAutoRetriesNextServer: 2 #切换实例的重试次数#    MaxAutoRetries: 2 #对当前实例的重试次数

prodvider工程

如图：UserServiceImpl 需要实现这个UserService和IUserService

import com.baomidou.mybatisplus.extension.service.IService;import com.study.seckill.entity.User;public interface UserService  extends IService<User> {}

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;import com.study.seckill.entity.User;import com.study.seckill.mapper.UserMapper;import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;import com.study.seckill.service.IUserService;import com.study.seckill.service.UserService;import org.springframework.stereotype.Service;import java.util.List;@Servicepublic class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService, UserService {    @Override    public List<User> quallAll() {        QueryWrapper<User> userQueryWrapper = new QueryWrapper<>();        return baseMapper.selectList(null);    }}

provider的application.properties

mybatis-plus.type-aliases-package=com.study.seckill.entitymybatis-plus.global.config.refresh-mapper=truemybatis-plus.mapper-locations=classpath:/mapper*.xml

provider依赖

<dependencies>    <dependency>      <groupId>com.study</groupId>      <artifactId>seckill-api</artifactId>      <version>0.0.1-SNAPSHOT</version>    </dependency>    <dependency>      <groupId>org.springframework.boot</groupId>      <artifactId>spring-boot-starter-jdbc</artifactId>    </dependency>    <dependency>      <groupId>org.springframework.boot</groupId>      <artifactId>spring-boot-starter-web</artifactId>    </dependency>    <dependency>      <groupId>org.springframework.cloud</groupId>      <artifactId>spring-cloud-starter-eureka</artifactId>    </dependency>    <dependency>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-starter-actuator</artifactId>    </dependency>    <dependency>      <groupId>mysql</groupId>      <artifactId>Mysql-connector-java</artifactId>    </dependency>    <dependency>      <groupId>com.baomidou</groupId>      <artifactId>mybatis-plus-boot-starter</artifactId>      <version>3.1.1</version>    </dependency>    <dependency>      <groupId>com.baomidou</groupId>      <artifactId>mybatis-plus</artifactId>      <version>3.1.1</version>    </dependency>    <!--用来支持AR-->    <dependency>      <groupId>com.baomidou</groupId>      <artifactId>mybatis-plus-generate</artifactId>      <version>2.2.0</version>    </dependency>    <dependency>      <groupId>com.baomidou</groupId>      <artifactId>mybatis-plus-extension</artifactId>      <version>3.1.1</version>    </dependency>    <!--自动生成模板-->    <dependency>      <groupId>org.freemarker</groupId>      <artifactId>freemarker</artifactId>      <version>2.3.29</version>    </dependency>    <!--连接池-->    <dependency>      <groupId>com.alibaba</groupId>      <artifactId>druid</artifactId>      <version>1.1.12</version>    </dependency>    <dependency>      <groupId>org.projectlombok</groupId>      <artifactId>lombok</artifactId>      <optional>true</optional>    </dependency>    <dependency>      <groupId>junit</groupId>      <artifactId>junit</artifactId>    </dependency>    <dependency>      <groupId>log4j</groupId>      <artifactId>log4j</artifactId>    </dependency>    <dependency>      <groupId>ch.qos.logback</groupId>      <artifactId>logback-core</artifactId>    </dependency>    <dependency>      <groupId>org.springframework.boot</groupId>      <artifactId>spring-boot-test</artifactId>    </dependency>    <dependency>      <groupId>org.springframework.boot</groupId>      <artifactId>spring-boot-starter-test</artifactId>      <scope>test</scope>      <exclusions>        <exclusion>          <groupId>org.junit.vintage</groupId>          <artifactId>junit-vintage-engine</artifactId>        </exclusion>      </exclusions>    </dependency>  </dependencies>  <build>    <!-- 添加资源 -->    <resources>      <resource>        <directory>src/main/resources</directory>        <!-- src/main/resources下的指定资源放行 -->        <includes>          <include>***.yml</include>          <include>***.xml</include>        </includes>        <filtering>false</filtering>      </resource>    </resources>  </build></project>

provider工程需要配置druid数据源，不然会报异常，这里不再赘述。

感谢各位的阅读，以上就是“Feign+mybatisplus搭建项目遇到的坑如何解决”的内容了，经过本文的学习后，相信大家对Feign+mybatisplus搭建项目遇到的坑如何解决这一问题有了更深刻的体会，具体使用情况还需要大家实践验证。这里是编程网，小编将为大家推送更多相关知识点的文章，欢迎关注！